fix(fusion_accounting_followup): seeded levels + migration idempotency

- test_create_minimal/negative_delay used sequence=1, which now collides
  with the seeded Friendly Reminder level. Use sequences 901/902.
- migration backfill: search by name (not raw seq) for idempotency,
  allocate sequence as max(existing)+1 to avoid both seed clashes and
  within-batch collisions when Enterprise has duplicate sequence values.

Made-with: Cursor

fusion_accounting/PHASE_4_PLAN.md

@@ -0,0 +1,140 @@
+# Phase 4 — Fusion Accounting Follow-up Implementation Plan
+
+**Module:** `fusion_accounting_followup`
+**Branch:** `fusion_accounting/phase-4-followup`
+**Pre-phase tag:** `fusion_accounting/pre-phase-4`
+**Estimated tasks:** ~35
+**Reference:** `/Users/gurpreet/Github/RePackaged-Odoo/accounting/account_followup/` (~1318 LOC Python)
+
+## Goal
+
+Replace Enterprise's `account_followup` module — multi-level dunning sequences for unpaid invoices, with AI augmentation: contextually-appropriate follow-up text generation + payment-risk scoring + tone adjustment based on customer history. Coexists with Enterprise.
+
+## Architecture (HYBRID engine, Phases 1-3 pattern)
+
+```
+fusion.followup.engine (AbstractModel)              ← shared primitives
+├── compute_followup_level(partner)
+├── get_overdue_for_partner(partner)
+├── send_followup_email(partner, level=None)
+├── escalate_to_next_level(partner)
+├── pause_followup(partner, until_date)
+├── reset_followup(partner)
+└── snapshot_followup_history(partner)               ← audit/history
+
+services/                                            ← pure-Python
+├── overdue_aging.py        → bucket overdue lines (current/30/60/90/120+)
+├── level_resolver.py       → match aging buckets to follow-up levels
+├── risk_scorer.py          → payment-history risk score (0-100)
+├── tone_selector.py        → gentle/firm/legal based on level + risk
+├── followup_text_generator.py → LLM-generated follow-up text
+└── followup_text_prompt.py → provider-agnostic LLM prompt
+
+models/
+├── fusion_followup_level.py        → level definition (delay days, template, action)
+├── fusion_followup_run.py          → execution record (per-partner per-level)
+├── fusion_followup_text_cache.py   → LLM-generated text cache (cost-saving)
+├── fusion_followup_engine.py       → AbstractModel orchestrator
+├── res_partner.py (inherit)        → fusion_followup_status, fusion_followup_paused_until
+└── account_move_line.py (inherit)  → followup_level_id (which level last contacted at)
+
+controllers/followup_controller.py                  ← 6 JSON-RPC endpoints
+├── /fusion/followup/list_overdue                    → list partners with overdue
+├── /fusion/followup/get_partner_detail              → single partner with aging + history
+├── /fusion/followup/generate_text                   → AI-generate follow-up text
+├── /fusion/followup/send                            → send a follow-up email
+├── /fusion/followup/pause                           → pause follow-ups for a partner
+└── /fusion/followup/reset                           → reset follow-up state
+
+static/src/
+├── scss/                          ← follow-up design tokens
+├── services/followup_service.js   ← reactive state + RPC wrappers
+├── views/followup_dashboard/      ← top-level OWL controller
+└── components/                    ← partner_card, aging_bucket_strip, ai_text_panel,
+                                     followup_history_table, risk_badge
+```
+
+## Coexistence
+
+`group_fusion_show_when_enterprise_absent`. Follow-up menu visible only when `account_followup` NOT installed.
+
+## Tasks (~35 total)
+
+### Group 1: Foundation (1-2)
+1. Safety net (DONE)
+2. Plan doc + module skeleton
+
+### Group 2: Pure-Python services TDD (3-7)
+3. `services/overdue_aging.py` (TDD: bucket lines into 0/30/60/90/120+)
+4. `services/level_resolver.py` (TDD: match aging to level)
+5. `services/risk_scorer.py` (TDD: payment-history risk 0-100)
+6. `services/tone_selector.py` (TDD: gentle/firm/legal)
+7. `services/followup_text_generator.py` + `followup_text_prompt.py` (LLM)
+
+### Group 3: Persisted models (8-12)
+8. `models/fusion_followup_level.py` (level definition)
+9. `models/fusion_followup_run.py` (execution record)
+10. `models/fusion_followup_text_cache.py` (LLM cache)
+11. `models/res_partner.py` (inherit: fusion_followup_status, paused_until)
+12. `models/account_move_line.py` (inherit: followup_level_id)
+
+### Group 4: Engine + integration tests (13-14)
+13. `models/fusion_followup_engine.py` (7-method API)
+14. Engine integration tests
+
+### Group 5: Backend wiring (15-18)
+15. JSON-RPC controller (6 endpoints)
+16. FollowupAdapter wiring `_via_fusion` paths
+17. 4 new AI tools (list_overdue, generate_text, send_followup, get_risk_score)
+18. Cron — daily scan + escalate
+
+### Group 6: Tests + perf (19-21)
+19. Property-based tests (Hypothesis: aging buckets sum to total)
+20. Integration tests (full follow-up flow: scan → escalate → send → reset)
+21. Performance benchmarks (P95: scan < 500ms, generate_text < 5s incl. LLM)
+
+### Group 7: Frontend (22-26)
+22. SCSS tokens + main stylesheet
+23. `followup_service.js`
+24. `followup_dashboard` (top-level)
+25. `partner_card` + `aging_bucket_strip` + `risk_badge`
+26. `ai_text_panel` (Fusion-only) + `followup_history_table`
+
+### Group 8: Wizards + data (27-29)
+27. Default follow-up levels XML data (7-day reminder, 30-day, 60-day, legal)
+28. Default mail templates XML data (3 escalation levels)
+29. "Send batch follow-ups" wizard
+
+### Group 9: Migration + coexistence (30-32)
+30. Migration wizard inheritance — backfill from account_followup tables
+31. Menu + window action with coexistence group filter
+32. Coexistence test
+
+### Group 10: Final tests + polish (33-37)
+33. 5 OWL tour tests
+34. Local LLM compat test for text_generator
+35. Update meta-module manifest
+36. CLAUDE.md, UPGRADE_NOTES.md, README.md
+37. End-to-end smoke + tag phase-4-complete + push
+
+## Performance Targets (P95)
+
+- `compute_followup_level`: <50ms
+- `get_overdue_for_partner`: <100ms
+- `send_followup_email` (no LLM): <200ms
+- `generate_text` (with LLM): <5s
+- Controller `list_overdue` (50 partners): <500ms
+
+## V19 Conventions (Phases 1-3 lessons)
+
+- `models.Constraint` not `_sql_constraints`
+- No `@api.depends('id')` on stored compute fields
+- `@route(type='jsonrpc')` not `type='json'`
+- `ir.cron` no `numbercall` field
+- `res.groups.user_ids` not `users`
+- `ir.ui.menu.group_ids` not `groups_id`
+- `from odoo.exceptions import UserError, ValidationError` (NOT `self.env['ir.exceptions'].UserError`)
+
+## Test Targets
+
+Match Phases 1-3 test pyramid. Phase 4 target: ~80-100 additional tests → ~510-530 total project tests.

fusion_accounting_ai/services/data_adapters/followup.py

@@ -28,7 +28,7 @@ def _bucket_for_days(days):
 
 
 class FollowupAdapter(DataAdapter):
-    FUSION_MODEL = 'fusion.followup.line'
+    FUSION_MODEL = 'fusion.followup.engine'
     ENTERPRISE_MODULE = 'account_followup'
 
     # ------------------------------------------------------------------
@@ -179,15 +179,29 @@ class FollowupAdapter(DataAdapter):
         }
 
     # ------------------------------------------------------------------
-    # send_followup — Enterprise-only action
+    # send_followup — routes to fusion engine when available
     # ------------------------------------------------------------------
-    def send_followup(self, partner_id, options=None):
-        return self._dispatch('send_followup', partner_id=partner_id, options=options)
+    def send_followup(self, partner_id, level_id=None, force=False, options=None):
+        return self._dispatch(
+            'send_followup',
+            partner_id=partner_id, level_id=level_id,
+            force=force, options=options,
+        )
 
-    def send_followup_via_fusion(self, partner_id, options=None):
-        return self.send_followup_via_community(partner_id=partner_id, options=options)
+    def send_followup_via_fusion(self, partner_id, level_id=None,
+                                 force=False, options=None):
+        if 'fusion.followup.engine' not in self.env.registry:
+            return {'error': 'fusion_accounting_followup not installed'}
+        partner = self.env['res.partner'].browse(int(partner_id))
+        level = None
+        if level_id:
+            level = self.env['fusion.followup.level'].browse(int(level_id))
+        return self.env['fusion.followup.engine'].send_followup_email(
+            partner, level=level, force=bool(force),
+        )
 
-    def send_followup_via_enterprise(self, partner_id, options=None):
+    def send_followup_via_enterprise(self, partner_id, level_id=None,
+                                     force=False, options=None):
         partner = self.env['res.partner'].browse(partner_id)
         if not partner.exists():
             return {'error': 'Partner not found'}
@@ -198,7 +212,8 @@ class FollowupAdapter(DataAdapter):
             'result': str(result) if result else 'done',
         }
 
-    def send_followup_via_community(self, partner_id, options=None):
+    def send_followup_via_community(self, partner_id, level_id=None,
+                                    force=False, options=None):
         return {
             'error': (
                 'Sending follow-ups is only available when account_followup '
@@ -206,5 +221,61 @@ class FollowupAdapter(DataAdapter):
             ),
         }
 
+    # ------------------------------------------------------------------
+    # list_overdue — partner-centric overdue rollup (fusion engine)
+    # ------------------------------------------------------------------
+    def list_overdue(self, status=None, limit=50, company_id=None):
+        return self._dispatch(
+            'list_overdue',
+            status=status, limit=limit, company_id=company_id,
+        )
+
+    def list_overdue_via_fusion(self, status=None, limit=50, company_id=None):
+        if 'fusion.followup.engine' not in self.env.registry:
+            return {'partners': [], 'count': 0, 'total': 0}
+        company_id = company_id or self.env.company.id
+        Line = self.env['account.move.line'].sudo()
+        partner_ids = Line.search([
+            ('parent_state', '=', 'posted'),
+            ('account_id.account_type', '=', 'asset_receivable'),
+            ('reconciled', '=', False),
+            ('amount_residual', '>', 0),
+            ('date_maturity', '<', date.today()),
+            ('company_id', '=', company_id),
+        ]).mapped('partner_id').ids
+        Partner = self.env['res.partner'].sudo()
+        domain = [('id', 'in', partner_ids)]
+        if status:
+            domain.append(('fusion_followup_status', '=', status))
+        partners = Partner.search(domain, limit=int(limit))
+        engine = self.env['fusion.followup.engine']
+        rows = []
+        for p in partners:
+            try:
+                overdue = engine.get_overdue_for_partner(p)
+                rows.append({
+                    'partner_id': p.id,
+                    'partner_name': p.name,
+                    'overdue_amount': overdue['aging']['total_overdue_amount'],
+                    'risk_score': overdue['risk']['score'],
+                    'risk_band': overdue['risk']['band'],
+                    'status': p.fusion_followup_status,
+                })
+            except Exception:
+                pass
+        return {'count': len(rows), 'total': len(partner_ids), 'partners': rows}
+
+    def list_overdue_via_enterprise(self, status=None, limit=50, company_id=None):
+        return {
+            'partners': [], 'count': 0, 'total': 0,
+            'error': 'Enterprise account_followup must be used from its UI',
+        }
+
+    def list_overdue_via_community(self, status=None, limit=50, company_id=None):
+        return {
+            'partners': [], 'count': 0, 'total': 0,
+            'error': 'No follow-up engine in pure Community',
+        }
+
 
 register_adapter('followup', FollowupAdapter)

fusion_accounting_ai/services/tools/__init__.py

@@ -11,12 +11,13 @@ from .reporting import TOOLS as REPORTING_TOOLS
 from .audit import TOOLS as AUDIT_TOOLS
 from .financial_reports import TOOLS as FINANCIAL_REPORTS_TOOLS
 from .asset_management import TOOLS as ASSET_MANAGEMENT_TOOLS
+from .customer_followup import TOOLS as CUSTOMER_FOLLOWUP_TOOLS
 
 TOOL_DISPATCH = {}
 for tools_dict in [
     BANK_RECON_TOOLS, HST_TOOLS, AR_TOOLS, AP_TOOLS, JOURNAL_TOOLS,
     MONTH_END_TOOLS, PAYROLL_TOOLS, INVENTORY_TOOLS, ADP_TOOLS,
     REPORTING_TOOLS, AUDIT_TOOLS, FINANCIAL_REPORTS_TOOLS,
-    ASSET_MANAGEMENT_TOOLS,
+    ASSET_MANAGEMENT_TOOLS, CUSTOMER_FOLLOWUP_TOOLS,
 ]:
     TOOL_DISPATCH.update(tools_dict)

fusion_accounting_ai/services/tools/customer_followup.py

@@ -0,0 +1,98 @@
+"""Fusion-engine-routed AI tools for customer follow-ups.
+
+These tools are exposed through TOOL_DISPATCH and let the assistant query
+the customer follow-up engine via natural language. All tools degrade
+gracefully when fusion_accounting_followup is not installed.
+"""
+
+import logging
+
+_logger = logging.getLogger(__name__)
+
+
+def fusion_list_overdue(env, params):
+    """List partners with overdue invoices, sorted by risk."""
+    if 'fusion.followup.engine' not in env.registry:
+        return {'error': 'fusion_accounting_followup not installed'}
+    from ..data_adapters import get_adapter
+    adapter = get_adapter(env, 'followup')
+    return adapter.list_overdue(
+        status=params.get('status'),
+        limit=int(params.get('limit', 50)),
+        company_id=int(params['company_id'])
+            if params.get('company_id') else env.company.id,
+    )
+
+
+def fusion_get_partner_followup_detail(env, params):
+    """Detailed follow-up state for a single partner: aging, risk, history."""
+    if 'fusion.followup.engine' not in env.registry:
+        return {'error': 'fusion_accounting_followup not installed'}
+    Partner = env['res.partner']
+    partner = Partner.browse(int(params['partner_id']))
+    if not partner.exists():
+        return {'error': 'Partner not found'}
+    engine = env['fusion.followup.engine']
+    overdue = engine.get_overdue_for_partner(partner)
+    history = engine.snapshot_followup_history(partner, limit=10)
+    return {
+        'partner_id': partner.id,
+        'partner_name': partner.name,
+        'overdue': overdue,
+        'history': history,
+    }
+
+
+def fusion_generate_followup_text(env, params):
+    """Generate (or fall back to template) follow-up subject + body."""
+    if 'fusion.followup.engine' not in env.registry:
+        return {'error': 'fusion_accounting_followup not installed'}
+    from odoo.addons.fusion_accounting_followup.services.followup_text_generator import (
+        generate_followup_text,
+    )
+    return generate_followup_text(
+        env,
+        partner_name=params.get('partner_name', ''),
+        total_overdue=float(params.get('total_overdue', 0)),
+        currency_code=params.get('currency_code', 'USD'),
+        longest_overdue_days=int(params.get('longest_overdue_days', 0)),
+        tone=params.get('tone', 'gentle'),
+        invoice_count=int(params.get('invoice_count', 0)),
+    )
+
+
+def fusion_send_followup(env, params):
+    """Send a follow-up email via the engine (creates a fusion.followup.run)."""
+    if 'fusion.followup.engine' not in env.registry:
+        return {'error': 'fusion_accounting_followup not installed'}
+    from ..data_adapters import get_adapter
+    adapter = get_adapter(env, 'followup')
+    return adapter.send_followup(
+        partner_id=int(params['partner_id']),
+        level_id=int(params['level_id']) if params.get('level_id') else None,
+        force=bool(params.get('force', False)),
+    )
+
+
+def fusion_get_partner_risk_score(env, params):
+    """Compute and return the payment-risk score + drivers for a partner."""
+    if 'fusion.followup.engine' not in env.registry:
+        return {'error': 'fusion_accounting_followup not installed'}
+    partner = env['res.partner'].browse(int(params['partner_id']))
+    if not partner.exists():
+        return {'error': 'Partner not found'}
+    overdue = env['fusion.followup.engine'].get_overdue_for_partner(partner)
+    return {
+        'partner_id': partner.id,
+        'partner_name': partner.name,
+        'risk': overdue['risk'],
+    }
+
+
+TOOLS = {
+    'fusion_list_overdue': fusion_list_overdue,
+    'fusion_get_partner_followup_detail': fusion_get_partner_followup_detail,
+    'fusion_generate_followup_text': fusion_generate_followup_text,
+    'fusion_send_followup': fusion_send_followup,
+    'fusion_get_partner_risk_score': fusion_get_partner_risk_score,
+}

fusion_accounting_followup/__init__.py

@@ -0,0 +1,5 @@
+from . import models
+from . import services
+from . import controllers
+from . import wizards
+from . import reports

fusion_accounting_followup/__manifest__.py

@@ -0,0 +1,68 @@
+{
+    'name': 'Fusion Accounting Follow-up',
+    'version': '19.0.1.0.28',
+    'category': 'Accounting/Accounting',
+    'summary': 'AI-augmented customer follow-ups (dunning) for unpaid invoices.',
+    'description': """
+Fusion Accounting Follow-up
+===========================
+
+A Fusion-native replacement for Odoo Enterprise's account_followup module.
+
+CORE scope (Phase 4):
+- Multi-level dunning sequences (gentle reminder, firm warning, legal)
+- Per-partner follow-up state (current level, paused-until, history)
+- Automated daily scan + escalation cron
+- Mail templates per level
+
+AI augmentation:
+- Contextually-appropriate follow-up text generation (LLM)
+- Payment-risk scoring from invoice/payment history
+- Tone selection (gentle/firm/legal) based on level + risk
+
+Coexists with Enterprise: when account_followup is installed, the Fusion
+menu hides; the engine + AI tools remain available for the chat.
+""",
+    'author': 'Fusion Accounting',
+    'license': 'LGPL-3',
+    'depends': [
+        'fusion_accounting_core',
+        'fusion_accounting_ai',
+        'fusion_accounting_migration',
+        'account',
+        'mail',
+    ],
+    'data': [
+        'security/ir.model.access.csv',
+        'data/cron.xml',
+        'data/followup_levels_data.xml',
+        'data/mail_templates_data.xml',
+        'wizards/batch_followup_wizard_views.xml',
+        'views/menu_views.xml',
+    ],
+    'assets': {
+        'web.assets_backend': [
+            'fusion_accounting_followup/static/src/scss/_variables.scss',
+            'fusion_accounting_followup/static/src/scss/followup.scss',
+            'fusion_accounting_followup/static/src/scss/dark_mode.scss',
+            'fusion_accounting_followup/static/src/services/followup_service.js',
+            'fusion_accounting_followup/static/src/views/followup_dashboard/followup_dashboard.js',
+            'fusion_accounting_followup/static/src/views/followup_dashboard/followup_dashboard.xml',
+            'fusion_accounting_followup/static/src/views/followup_dashboard/followup_dashboard_view.js',
+            'fusion_accounting_followup/static/src/components/risk_badge/risk_badge.js',
+            'fusion_accounting_followup/static/src/components/risk_badge/risk_badge.xml',
+            'fusion_accounting_followup/static/src/components/partner_card/partner_card.js',
+            'fusion_accounting_followup/static/src/components/partner_card/partner_card.xml',
+            'fusion_accounting_followup/static/src/components/aging_bucket_strip/aging_bucket_strip.js',
+            'fusion_accounting_followup/static/src/components/aging_bucket_strip/aging_bucket_strip.xml',
+            'fusion_accounting_followup/static/src/components/ai_text_panel/ai_text_panel.js',
+            'fusion_accounting_followup/static/src/components/ai_text_panel/ai_text_panel.xml',
+            'fusion_accounting_followup/static/src/components/followup_history_table/followup_history_table.js',
+            'fusion_accounting_followup/static/src/components/followup_history_table/followup_history_table.xml',
+        ],
+    },
+    'installable': True,
+    'auto_install': False,
+    'application': False,
+    'icon': '/fusion_accounting_followup/static/description/icon.png',
+}

fusion_accounting_followup/controllers/__init__.py

@@ -0,0 +1 @@
+from . import followup_controller

fusion_accounting_followup/controllers/followup_controller.py

@@ -0,0 +1,173 @@
+"""HTTP controller: 6 JSON-RPC endpoints for the OWL follow-up dashboard.
+
+All endpoints route through fusion.followup.engine. V19 type='jsonrpc'.
+"""
+
+import logging
+from datetime import date, datetime
+
+from odoo import _, http
+from odoo.exceptions import ValidationError
+from odoo.http import request
+
+_logger = logging.getLogger(__name__)
+
+
+def _parse_date(value):
+    if isinstance(value, date):
+        return value
+    if not value:
+        return None
+    return datetime.strptime(value, '%Y-%m-%d').date()
+
+
+class FusionFollowupController(http.Controller):
+
+    @http.route('/fusion/followup/list_overdue', type='jsonrpc', auth='user')
+    def list_overdue(self, limit=50, offset=0, status=None, company_id=None):
+        company_id = int(company_id) if company_id else request.env.company.id
+        Partner = request.env['res.partner'].sudo()
+        Line = request.env['account.move.line'].sudo()
+        overdue_partner_ids = Line.search([
+            ('parent_state', '=', 'posted'),
+            ('account_id.account_type', '=', 'asset_receivable'),
+            ('reconciled', '=', False),
+            ('amount_residual', '>', 0),
+            ('date_maturity', '<', date.today()),
+            ('company_id', '=', company_id),
+        ]).mapped('partner_id').ids
+
+        domain = [('id', 'in', overdue_partner_ids)]
+        if status:
+            domain.append(('fusion_followup_status', '=', status))
+        total = Partner.search_count(domain)
+        partners = Partner.search(domain, limit=int(limit), offset=int(offset))
+
+        engine = request.env['fusion.followup.engine']
+        rows = []
+        for p in partners:
+            try:
+                overdue = engine.get_overdue_for_partner(p)
+                rows.append({
+                    'partner_id': p.id,
+                    'partner_name': p.name,
+                    'email': p.email or '',
+                    'status': p.fusion_followup_status,
+                    'paused_until': str(p.fusion_followup_paused_until)
+                        if p.fusion_followup_paused_until else None,
+                    'last_level_id': p.fusion_followup_last_level_id.id
+                        if p.fusion_followup_last_level_id else None,
+                    'last_level_name': p.fusion_followup_last_level_id.name
+                        if p.fusion_followup_last_level_id else None,
+                    'last_run_date': str(p.fusion_followup_last_run_date)
+                        if p.fusion_followup_last_run_date else None,
+                    'overdue_amount': overdue['aging']['total_overdue_amount'],
+                    'overdue_line_count': overdue['overdue_line_count'],
+                    'risk_score': overdue['risk']['score'],
+                    'risk_band': overdue['risk']['band'],
+                })
+            except Exception as e:
+                _logger.warning("Skipping partner %s in list: %s", p.id, e)
+        return {'count': len(rows), 'total': total, 'partners': rows}
+
+    @http.route('/fusion/followup/get_partner_detail', type='jsonrpc', auth='user')
+    def get_partner_detail(self, partner_id):
+        partner = request.env['res.partner'].browse(int(partner_id))
+        if not partner.exists():
+            raise ValidationError(_("Partner %s not found") % partner_id)
+        engine = request.env['fusion.followup.engine']
+        overdue = engine.get_overdue_for_partner(partner)
+        history = engine.snapshot_followup_history(partner, limit=20)
+        level = engine.compute_followup_level(partner)
+        return {
+            'partner': {
+                'id': partner.id,
+                'name': partner.name,
+                'email': partner.email or '',
+                'status': partner.fusion_followup_status,
+                'paused_until': str(partner.fusion_followup_paused_until)
+                    if partner.fusion_followup_paused_until else None,
+                'last_level_id': partner.fusion_followup_last_level_id.id
+                    if partner.fusion_followup_last_level_id else None,
+                'last_level_name': partner.fusion_followup_last_level_id.name
+                    if partner.fusion_followup_last_level_id else None,
+                'last_run_date': str(partner.fusion_followup_last_run_date)
+                    if partner.fusion_followup_last_run_date else None,
+                'risk_score': partner.fusion_followup_risk_score,
+                'risk_band': partner.fusion_followup_risk_band,
+            },
+            'overdue': overdue,
+            'suggested_level': {
+                'id': level.id, 'name': level.name, 'tone': level.tone,
+                'sequence': level.sequence,
+            } if level else None,
+            'history': history,
+        }
+
+    @http.route('/fusion/followup/generate_text', type='jsonrpc', auth='user')
+    def generate_text(self, partner_id, level_id=None, force_regenerate=False):
+        from odoo.addons.fusion_accounting_followup.services.followup_text_generator import (
+            generate_followup_text,
+        )
+        from odoo.addons.fusion_accounting_followup.services.tone_selector import select_tone
+
+        partner = request.env['res.partner'].browse(int(partner_id))
+        engine = request.env['fusion.followup.engine']
+        if level_id:
+            level = request.env['fusion.followup.level'].browse(int(level_id))
+        else:
+            level = engine.compute_followup_level(partner)
+        if not level:
+            return {'status': 'no_level', 'partner_id': partner.id}
+
+        overdue = engine.get_overdue_for_partner(partner)
+        tone = select_tone(
+            level_sequence=level.sequence,
+            risk_score=overdue['risk']['score'],
+        )
+
+        currency_code = 'USD'
+        if partner.company_id and partner.company_id.currency_id:
+            currency_code = partner.company_id.currency_id.name or 'USD'
+
+        text = generate_followup_text(
+            request.env,
+            partner_name=partner.name,
+            total_overdue=overdue['aging']['total_overdue_amount'],
+            currency_code=currency_code,
+            longest_overdue_days=engine._max_overdue_days_from_aging(overdue['aging']),
+            tone=tone,
+            invoice_count=overdue['overdue_line_count'],
+            risk_drivers=overdue['risk']['drivers'],
+        )
+        return {
+            'status': 'ok',
+            'partner_id': partner.id,
+            'level_id': level.id,
+            'tone': tone,
+            'subject': text.get('subject', ''),
+            'body': text.get('body', ''),
+            'tone_used': text.get('tone_used', tone),
+            'key_points': text.get('key_points', []),
+        }
+
+    @http.route('/fusion/followup/send', type='jsonrpc', auth='user')
+    def send_followup(self, partner_id, level_id=None, force=False):
+        partner = request.env['res.partner'].browse(int(partner_id))
+        engine = request.env['fusion.followup.engine']
+        level = None
+        if level_id:
+            level = request.env['fusion.followup.level'].browse(int(level_id))
+        return engine.send_followup_email(partner, level=level, force=bool(force))
+
+    @http.route('/fusion/followup/pause', type='jsonrpc', auth='user')
+    def pause(self, partner_id, until_date=None):
+        partner = request.env['res.partner'].browse(int(partner_id))
+        engine = request.env['fusion.followup.engine']
+        return engine.pause_followup(partner, until_date=_parse_date(until_date))
+
+    @http.route('/fusion/followup/reset', type='jsonrpc', auth='user')
+    def reset(self, partner_id):
+        partner = request.env['res.partner'].browse(int(partner_id))
+        engine = request.env['fusion.followup.engine']
+        return engine.reset_followup(partner)

fusion_accounting_followup/data/cron.xml

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+<odoo noupdate="1">
+
+    <record id="cron_fusion_followup_daily_scan" model="ir.cron">
+        <field name="name">Fusion Follow-up — Daily Scan + Send</field>
+        <field name="model_id" ref="model_fusion_followup_cron"/>
+        <field name="state">code</field>
+        <field name="code">model._cron_daily_scan()</field>
+        <field name="interval_number">1</field>
+        <field name="interval_type">days</field>
+        <field name="active" eval="True"/>
+    </record>
+
+    <record id="cron_fusion_followup_risk_refresh" model="ir.cron">
+        <field name="name">Fusion Follow-up — Weekly Risk Refresh</field>
+        <field name="model_id" ref="model_fusion_followup_cron"/>
+        <field name="state">code</field>
+        <field name="code">model._cron_risk_refresh()</field>
+        <field name="interval_number">7</field>
+        <field name="interval_type">days</field>
+        <field name="active" eval="True"/>
+    </record>
+
+</odoo>

fusion_accounting_followup/data/followup_levels_data.xml

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="utf-8"?>
+<odoo noupdate="1">
+
+    <record id="level_reminder" model="fusion.followup.level">
+        <field name="name">Friendly Reminder</field>
+        <field name="sequence">1</field>
+        <field name="delay_days">7</field>
+        <field name="tone">gentle</field>
+        <field name="description">First contact - friendly reminder of overdue invoice.</field>
+        <field name="active" eval="True"/>
+    </record>
+
+    <record id="level_warning" model="fusion.followup.level">
+        <field name="name">Firm Warning</field>
+        <field name="sequence">2</field>
+        <field name="delay_days">30</field>
+        <field name="tone">firm</field>
+        <field name="description">Second contact - clear request for immediate action.</field>
+        <field name="active" eval="True"/>
+    </record>
+
+    <record id="level_legal_notice" model="fusion.followup.level">
+        <field name="name">Legal Notice</field>
+        <field name="sequence">3</field>
+        <field name="delay_days">60</field>
+        <field name="tone">legal</field>
+        <field name="description">Final notice before referring to collections.</field>
+        <field name="requires_manual_review" eval="True"/>
+        <field name="active" eval="True"/>
+    </record>
+
+</odoo>

fusion_accounting_followup/data/mail_templates_data.xml

@@ -0,0 +1,85 @@
+<?xml version="1.0" encoding="utf-8"?>
+<odoo noupdate="1">
+
+    <record id="email_template_followup_gentle" model="mail.template">
+        <field name="name">Fusion Followup: Friendly Reminder</field>
+        <field name="model_id" ref="base.model_res_partner"/>
+        <field name="subject">Friendly reminder: invoice payment</field>
+        <field name="email_from">{{ user.email_formatted }}</field>
+        <field name="email_to">{{ object.email }}</field>
+        <field name="body_html" type="html">
+<div>
+    <p>Dear <t t-out="object.name"/>,</p>
+    <p>This is a friendly reminder that you have outstanding invoices on
+    your account. We understand that things happen — please let us know
+    if there is anything we can do to help resolve this.</p>
+    <p>You can review your account statement at any time, or contact our
+    accounts receivable team with any questions.</p>
+    <p>Best regards,<br/>
+    <t t-out="user.company_id.name"/></p>
+</div>
+        </field>
+        <field name="lang">{{ object.lang }}</field>
+        <field name="auto_delete" eval="True"/>
+    </record>
+
+    <record id="email_template_followup_firm" model="mail.template">
+        <field name="name">Fusion Followup: Firm Warning</field>
+        <field name="model_id" ref="base.model_res_partner"/>
+        <field name="subject">Outstanding invoices — action required</field>
+        <field name="email_from">{{ user.email_formatted }}</field>
+        <field name="email_to">{{ object.email }}</field>
+        <field name="body_html" type="html">
+<div>
+    <p>Dear <t t-out="object.name"/>,</p>
+    <p>Our records show outstanding invoices that require your immediate
+    attention. We request that you remit payment as soon as possible to
+    avoid further escalation.</p>
+    <p>If you have already remitted payment, please disregard this notice
+    and contact us with the payment details so we can update our records.</p>
+    <p>If there are any disputes or concerns regarding these invoices,
+    please contact our accounts receivable team immediately.</p>
+    <p>Regards,<br/>
+    <t t-out="user.company_id.name"/></p>
+</div>
+        </field>
+        <field name="lang">{{ object.lang }}</field>
+        <field name="auto_delete" eval="True"/>
+    </record>
+
+    <record id="email_template_followup_legal" model="mail.template">
+        <field name="name">Fusion Followup: Legal Notice</field>
+        <field name="model_id" ref="base.model_res_partner"/>
+        <field name="subject">FINAL NOTICE — outstanding balance</field>
+        <field name="email_from">{{ user.email_formatted }}</field>
+        <field name="email_to">{{ object.email }}</field>
+        <field name="body_html" type="html">
+<div>
+    <p>Dear <t t-out="object.name"/>,</p>
+    <p>This is a FINAL NOTICE regarding outstanding invoices on your
+    account. Despite previous reminders, your balance remains unpaid.</p>
+    <p>If full payment is not received within 7 days from the date of this
+    notice, we will be forced to refer this matter to our legal department
+    for collection. This may include reporting the delinquency to credit
+    bureaus and pursuing further legal action as permitted by law.</p>
+    <p>Please contact us immediately to resolve this matter.</p>
+    <p>Regards,<br/>
+    <t t-out="user.company_id.name"/></p>
+</div>
+        </field>
+        <field name="lang">{{ object.lang }}</field>
+        <field name="auto_delete" eval="True"/>
+    </record>
+
+    <!-- Wire templates to default levels -->
+    <record id="level_reminder" model="fusion.followup.level">
+        <field name="mail_template_id" ref="email_template_followup_gentle"/>
+    </record>
+    <record id="level_warning" model="fusion.followup.level">
+        <field name="mail_template_id" ref="email_template_followup_firm"/>
+    </record>
+    <record id="level_legal_notice" model="fusion.followup.level">
+        <field name="mail_template_id" ref="email_template_followup_legal"/>
+    </record>
+
+</odoo>

fusion_accounting_followup/models/__init__.py

@@ -0,0 +1,8 @@
+from . import fusion_followup_level
+from . import fusion_followup_run
+from . import fusion_followup_text_cache
+from . import res_partner
+from . import account_move_line
+from . import fusion_followup_engine
+from . import fusion_followup_cron
+from . import fusion_migration_wizard

fusion_accounting_followup/models/account_move_line.py

@@ -0,0 +1,14 @@
+"""Inherit account.move.line: track last follow-up level."""
+
+from odoo import _, api, fields, models
+
+
+class AccountMoveLine(models.Model):
+    _inherit = "account.move.line"
+
+    fusion_followup_level_id = fields.Many2one(
+        'fusion.followup.level', copy=False,
+        help="Last follow-up level at which this line was contacted.")
+    fusion_followup_last_run_date = fields.Datetime(
+        copy=False,
+        help="When the line was most-recently included in a follow-up.")

fusion_accounting_followup/models/fusion_followup_cron.py

@@ -0,0 +1,84 @@
+"""Cron handlers for fusion_accounting_followup.
+
+Two scheduled jobs:
+- Daily scan: walk every partner with an open overdue receivable line and
+  call the engine to send/escalate where appropriate.
+- Weekly risk refresh: recompute fusion_followup_risk_score on every
+  partner with overdue.
+"""
+
+import logging
+from datetime import date
+
+from odoo import api, models
+
+_logger = logging.getLogger(__name__)
+
+
+class FusionFollowupCron(models.AbstractModel):
+    _name = "fusion.followup.cron"
+    _description = "Fusion Follow-up Cron Handlers"
+
+    @api.model
+    def _cron_daily_scan(self):
+        """Scan every partner with overdue and send follow-ups when due."""
+        engine = self.env['fusion.followup.engine']
+        Line = self.env['account.move.line'].sudo()
+        overdue_lines = Line.search([
+            ('parent_state', '=', 'posted'),
+            ('account_id.account_type', '=', 'asset_receivable'),
+            ('reconciled', '=', False),
+            ('amount_residual', '>', 0),
+            ('date_maturity', '<', date.today()),
+        ])
+        partner_ids = list(set(overdue_lines.mapped('partner_id').ids))
+        sent = 0
+        skipped = 0
+        for pid in partner_ids:
+            partner = self.env['res.partner'].sudo().browse(pid)
+            if not partner.exists():
+                continue
+            try:
+                with self.env.cr.savepoint():
+                    result = engine.send_followup_email(partner)
+                    if result.get('status') == 'sent':
+                        sent += 1
+                    else:
+                        skipped += 1
+            except Exception as e:
+                _logger.warning(
+                    "Cron daily_scan failed for partner %s: %s", pid, e,
+                )
+                skipped += 1
+        _logger.info(
+            "Cron: scanned %d partners, sent %d, skipped %d",
+            len(partner_ids), sent, skipped,
+        )
+
+    @api.model
+    def _cron_risk_refresh(self):
+        """Refresh fusion_followup_risk_score on every partner with overdue."""
+        Partner = self.env['res.partner'].sudo()
+        engine = self.env['fusion.followup.engine']
+        Line = self.env['account.move.line'].sudo()
+        partner_ids = list(set(Line.search([
+            ('parent_state', '=', 'posted'),
+            ('account_id.account_type', '=', 'asset_receivable'),
+            ('reconciled', '=', False),
+            ('amount_residual', '>', 0),
+        ]).mapped('partner_id').ids))
+        updated = 0
+        for pid in partner_ids:
+            partner = Partner.browse(pid)
+            try:
+                overdue = engine.get_overdue_for_partner(partner)
+                partner.write({
+                    'fusion_followup_risk_score': overdue['risk']['score'],
+                    'fusion_followup_risk_band': overdue['risk']['band'],
+                })
+                updated += 1
+            except Exception as e:
+                _logger.warning(
+                    "Risk refresh failed for partner %s: %s", pid, e,
+                )
+        _logger.info("Cron: refreshed risk on %d partners", updated)

fusion_accounting_followup/models/fusion_followup_engine.py

@@ -0,0 +1,379 @@
+"""The follow-up engine — orchestrator for customer follow-ups.
+
+7-method public API. All controllers, AI tools, wizards, cron must
+go through this engine; no direct ORM writes to fusion.followup.run
+from elsewhere."""
+
+import logging
+from datetime import date, timedelta
+
+from odoo import _, api, fields, models
+from odoo.exceptions import ValidationError, UserError
+
+from ..services.overdue_aging import compute_aging
+from ..services.level_resolver import resolve_level, FollowupLevelSpec
+from ..services.risk_scorer import score_partner
+from ..services.tone_selector import select_tone
+from ..services.followup_text_generator import generate_followup_text
+
+_logger = logging.getLogger(__name__)
+
+
+class FusionFollowupEngine(models.AbstractModel):
+    _name = "fusion.followup.engine"
+    _description = "Fusion Follow-up Engine"
+
+    # ============================================================
+    # PUBLIC API (7 methods)
+    # ============================================================
+
+    @api.model
+    def get_overdue_for_partner(self, partner) -> dict:
+        """Return aging report + risk score for a partner."""
+        partner.ensure_one()
+        as_of = fields.Date.today()
+        move_lines = self._fetch_overdue_lines(partner)
+        aging = compute_aging(
+            move_lines=[{
+                'date_maturity': l.date_maturity,
+                'amount_residual': l.amount_residual,
+            } for l in move_lines],
+            as_of=as_of,
+        )
+        risk = self._compute_risk(partner, move_lines)
+        return {
+            'partner_id': partner.id,
+            'as_of': str(as_of),
+            'aging': aging.to_dict(),
+            'risk': {
+                'score': risk.score,
+                'band': risk.band,
+                'drivers': risk.drivers,
+            },
+            'overdue_line_count': len(move_lines),
+        }
+
+    @api.model
+    def compute_followup_level(self, partner, *, ignore_pause=False):
+        """Return the fusion.followup.level recordset that should fire now,
+        or empty recordset if no action needed."""
+        partner.ensure_one()
+        Level = self.env['fusion.followup.level']
+        if not ignore_pause and partner.fusion_followup_paused_until and \
+                partner.fusion_followup_paused_until > fields.Date.today():
+            return Level
+
+        as_of = fields.Date.today()
+        move_lines = self._fetch_overdue_lines(partner)
+        if not move_lines:
+            return Level
+        aging = compute_aging(
+            move_lines=[{
+                'date_maturity': l.date_maturity,
+                'amount_residual': l.amount_residual,
+            } for l in move_lines],
+            as_of=as_of,
+        )
+
+        company_id = partner.company_id.id if partner.company_id else self.env.company.id
+        levels = Level.search([
+            ('active', '=', True),
+            '|', ('company_id', '=', company_id), ('company_id', '=', False),
+        ], order='sequence')
+        if not levels:
+            return Level
+
+        specs = [FollowupLevelSpec(
+            sequence=l.sequence, name=l.name,
+            delay_days=l.delay_days, tone=l.tone,
+        ) for l in levels]
+
+        chosen_spec = resolve_level(aging_report=aging, levels=specs)
+        if chosen_spec is None:
+            return Level
+
+        return levels.filtered(lambda l: l.sequence == chosen_spec.sequence)[:1]
+
+    @api.model
+    def send_followup_email(self, partner, *, level=None, force=False) -> dict:
+        """Send a follow-up email at the given level (or auto-resolve if None).
+
+        Creates a fusion.followup.run record. Uses cached text if available."""
+        partner.ensure_one()
+
+        if not force and partner.fusion_followup_paused_until and \
+                partner.fusion_followup_paused_until > fields.Date.today():
+            return {
+                'status': 'paused_until_' + str(partner.fusion_followup_paused_until),
+                'partner_id': partner.id,
+            }
+
+        if not level:
+            level = self.compute_followup_level(partner, ignore_pause=force)
+            if not level:
+                return {'status': 'no_action', 'partner_id': partner.id}
+
+        if level.requires_manual_review and not force:
+            run = self._create_run(partner, level, state='manual_review')
+            return {
+                'status': 'manual_review',
+                'partner_id': partner.id,
+                'run_id': run.id,
+            }
+
+        overdue_data = self.get_overdue_for_partner(partner)
+        if overdue_data['overdue_line_count'] == 0:
+            return {'status': 'no_overdue', 'partner_id': partner.id}
+
+        tone = select_tone(
+            level_sequence=level.sequence,
+            risk_score=overdue_data['risk']['score'],
+        )
+
+        text_data = self._get_or_generate_text(
+            partner=partner, level=level,
+            overdue_amount=overdue_data['aging']['total_overdue_amount'],
+            longest_overdue_days=self._max_overdue_days_from_aging(overdue_data['aging']),
+            invoice_count=overdue_data['overdue_line_count'],
+            tone=tone, risk_drivers=overdue_data['risk']['drivers'],
+        )
+
+        run = self._create_run(
+            partner, level, state='draft',
+            overdue_amount=overdue_data['aging']['total_overdue_amount'],
+            longest_overdue_days=self._max_overdue_days_from_aging(overdue_data['aging']),
+            risk_score=overdue_data['risk']['score'],
+            risk_band=overdue_data['risk']['band'],
+            subject=text_data['subject'],
+            body=text_data['body'],
+            tone_used=text_data['tone_used'],
+            text_was_ai_generated=text_data.get('_was_ai', False),
+        )
+
+        try:
+            self._send_email(partner, run)
+            run.write({'state': 'sent'})
+            partner.write({
+                'fusion_followup_status': 'no_action',
+                'fusion_followup_last_level_id': level.id,
+                'fusion_followup_last_run_date': fields.Datetime.now(),
+            })
+        except Exception as e:
+            _logger.warning("Email send failed for partner %s: %s", partner.id, e)
+            run.write({'state': 'failed', 'error_message': str(e)})
+
+        return {
+            'status': 'sent', 'partner_id': partner.id,
+            'run_id': run.id, 'level_id': level.id, 'tone': tone,
+        }
+
+    @api.model
+    def escalate_to_next_level(self, partner) -> dict:
+        """Force the next-higher level than the partner's current last_level."""
+        partner.ensure_one()
+        Level = self.env['fusion.followup.level']
+        current = partner.fusion_followup_last_level_id
+        next_seq = (current.sequence + 1) if current else 1
+        company_id = partner.company_id.id if partner.company_id else self.env.company.id
+        next_level = Level.search([
+            ('active', '=', True),
+            ('sequence', '>=', next_seq),
+            '|', ('company_id', '=', company_id), ('company_id', '=', False),
+        ], order='sequence', limit=1)
+        if not next_level:
+            return {'status': 'at_max_level', 'partner_id': partner.id}
+        return self.send_followup_email(partner, level=next_level, force=True)
+
+    @api.model
+    def pause_followup(self, partner, until_date: date = None) -> dict:
+        """Pause follow-ups for a partner until a date (default 30 days)."""
+        partner.ensure_one()
+        until = until_date or (fields.Date.today() + timedelta(days=30))
+        partner.write({
+            'fusion_followup_paused_until': until,
+            'fusion_followup_status': 'paused',
+        })
+        return {'partner_id': partner.id, 'paused_until': str(until)}
+
+    @api.model
+    def reset_followup(self, partner) -> dict:
+        """Reset partner's follow-up state to no_action."""
+        partner.ensure_one()
+        partner.write({
+            'fusion_followup_status': 'no_action',
+            'fusion_followup_paused_until': False,
+            'fusion_followup_last_level_id': False,
+        })
+        return {'partner_id': partner.id, 'status': 'reset'}
+
+    @api.model
+    def snapshot_followup_history(self, partner, *, limit: int = 50) -> dict:
+        """Return audit history for a partner."""
+        partner.ensure_one()
+        Run = self.env['fusion.followup.run']
+        runs = Run.search([
+            ('partner_id', '=', partner.id),
+        ], order='execution_date desc', limit=int(limit))
+        return {
+            'partner_id': partner.id,
+            'count': len(runs),
+            'runs': [{
+                'id': r.id, 'date': str(r.execution_date),
+                'level_id': r.level_id.id if r.level_id else None,
+                'level_name': r.level_id.name if r.level_id else '',
+                'state': r.state,
+                'overdue_amount': r.overdue_amount,
+                'longest_overdue_days': r.longest_overdue_days,
+                'tone_used': r.tone_used,
+                'risk_score': r.risk_score,
+                'subject': r.subject or '',
+                'text_was_ai_generated': r.text_was_ai_generated,
+            } for r in runs],
+        }
+
+    # ============================================================
+    # PRIVATE HELPERS
+    # ============================================================
+
+    def _fetch_overdue_lines(self, partner):
+        """Fetch posted, unreconciled receivable lines for a partner."""
+        Line = self.env['account.move.line'].sudo()
+        return Line.search([
+            ('partner_id', '=', partner.id),
+            ('parent_state', '=', 'posted'),
+            ('account_id.account_type', '=', 'asset_receivable'),
+            ('reconciled', '=', False),
+            ('amount_residual', '>', 0),
+        ])
+
+    def _compute_risk(self, partner, overdue_lines):
+        """Compute risk score from partner's payment history."""
+        Line = self.env['account.move.line'].sudo()
+        all_lines = Line.search([
+            ('partner_id', '=', partner.id),
+            ('parent_state', '=', 'posted'),
+            ('account_id.account_type', '=', 'asset_receivable'),
+        ])
+        total_invoices = len(all_lines)
+        # Heavy paid-late computation deferred to Phase 4.5
+        paid_late_count = 0
+        avg_days_late = 0.0
+
+        as_of = fields.Date.today()
+        longest_overdue_days = 0
+        for line in overdue_lines:
+            if line.date_maturity:
+                days = (as_of - line.date_maturity).days
+                if days > longest_overdue_days:
+                    longest_overdue_days = days
+
+        open_overdue = sum(line.amount_residual for line in overdue_lines)
+        avg_invoice_amount = 1000.0
+        if total_invoices > 0:
+            total_amount = sum(all_lines.mapped('balance'))
+            if total_amount:
+                avg_invoice_amount = abs(total_amount) / total_invoices
+
+        return score_partner(
+            total_invoices=total_invoices,
+            paid_late_count=paid_late_count,
+            avg_days_late=avg_days_late,
+            longest_overdue_days=longest_overdue_days,
+            open_overdue_amount=open_overdue,
+            average_invoice_amount=avg_invoice_amount,
+        )
+
+    def _max_overdue_days_from_aging(self, aging_dict):
+        """Extract longest overdue days from aging dict."""
+        tracked = aging_dict.get('max_days_overdue', 0) or 0
+        if tracked:
+            return tracked
+        max_days = 0
+        for b in aging_dict.get('buckets', []):
+            if b['name'] == 'current' or b['amount'] <= 0:
+                continue
+            if b['days_max'] is None:
+                max_days = max(max_days, b['days_min'])
+            else:
+                max_days = max(max_days, b['days_max'])
+        return max_days
+
+    def _get_or_generate_text(self, *, partner, level, overdue_amount,
+                              longest_overdue_days, invoice_count, tone,
+                              risk_drivers=None) -> dict:
+        """Cache lookup + LLM fallback."""
+        Cache = self.env['fusion.followup.text.cache']
+        cached = Cache.lookup(
+            partner_id=partner.id, level_id=level.id,
+            overdue_amount=overdue_amount,
+            longest_overdue_days=longest_overdue_days,
+            invoice_count=invoice_count, tone=tone,
+        )
+        if cached:
+            cached.action_increment_use()
+            return {
+                'subject': cached.subject, 'body': cached.body,
+                'tone_used': cached.tone_used,
+                'key_points': cached.key_points or [],
+                '_was_ai': bool(cached.provider),
+            }
+
+        company = partner.company_id or self.env.company
+        currency = company.currency_id
+        text = generate_followup_text(
+            self.env,
+            partner_name=partner.name,
+            total_overdue=overdue_amount,
+            currency_code=currency.name or 'USD',
+            longest_overdue_days=longest_overdue_days,
+            tone=tone, invoice_count=invoice_count,
+            risk_drivers=risk_drivers,
+        )
+        try:
+            Cache.sudo().create({
+                'partner_id': partner.id, 'level_id': level.id,
+                'company_id': company.id,
+                'fingerprint': Cache.compute_fingerprint(
+                    partner_id=partner.id, level_id=level.id,
+                    overdue_amount=overdue_amount,
+                    longest_overdue_days=longest_overdue_days,
+                    invoice_count=invoice_count, tone=tone,
+                ),
+                'subject': text['subject'], 'body': text['body'],
+                'tone_used': text.get('tone_used', tone),
+                'key_points': text.get('key_points', []),
+            })
+        except Exception as e:
+            _logger.debug("Cache create failed (non-fatal): %s", e)
+
+        text['_was_ai'] = False
+        return text
+
+    def _create_run(self, partner, level, *, state='draft', **vals):
+        Run = self.env['fusion.followup.run'].sudo()
+        company = partner.company_id or self.env.company
+        defaults = {
+            'partner_id': partner.id,
+            'company_id': company.id,
+            'level_id': level.id if level else False,
+            'state': state,
+        }
+        defaults.update(vals)
+        return Run.create(defaults)
+
+    def _send_email(self, partner, run):
+        """Best-effort email send. Uses level's mail_template if set, else
+        creates a simple message."""
+        if not partner.email:
+            raise UserError(_("Partner %s has no email address.") % partner.name)
+        if run.level_id and run.level_id.mail_template_id:
+            run.level_id.mail_template_id.send_mail(partner.id, force_send=True)
+        else:
+            body_text = (run.body or '').replace('<', '&lt;').replace('>', '&gt;')
+            self.env['mail.mail'].sudo().create({
+                'subject': run.subject or 'Follow-up',
+                'body_html': '<pre>{}</pre>'.format(body_text),
+                'email_to': partner.email,
+                'recipient_ids': [(4, partner.id)],
+            }).send()
+        run.write({'sent_to_email': partner.email})

fusion_accounting_followup/models/fusion_followup_level.py

@@ -0,0 +1,42 @@
+"""Follow-up level definition (e.g. Reminder at 7 days, Warning at 30, Legal at 60)."""
+
+from odoo import _, api, fields, models
+
+
+TONE_SELECTION = [
+    ('gentle', 'Gentle'),
+    ('firm', 'Firm'),
+    ('legal', 'Legal'),
+]
+
+
+class FusionFollowupLevel(models.Model):
+    _name = "fusion.followup.level"
+    _description = "Fusion Follow-up Level"
+    _order = "sequence, id"
+
+    name = fields.Char(required=True, translate=True)
+    sequence = fields.Integer(required=True, default=10,
+                              help="Order in which levels escalate (1, 2, 3...).")
+    delay_days = fields.Integer(required=True,
+                                help="Min days overdue to trigger this level.")
+    tone = fields.Selection(TONE_SELECTION, required=True, default='gentle')
+    description = fields.Text()
+    company_id = fields.Many2one('res.company', default=lambda self: self.env.company)
+
+    mail_template_id = fields.Many2one('mail.template',
+                                       domain=[('model', '=', 'res.partner')])
+
+    requires_manual_review = fields.Boolean(default=False,
+        help="If True, follow-ups at this level need human approval before send.")
+
+    active = fields.Boolean(default=True)
+
+    _check_delay_positive = models.Constraint(
+        'CHECK(delay_days >= 0)',
+        'delay_days must be non-negative.',
+    )
+    _unique_sequence_per_company = models.Constraint(
+        'UNIQUE(company_id, sequence)',
+        'Sequence must be unique per company.',
+    )

fusion_accounting_followup/models/fusion_followup_run.py

@@ -0,0 +1,54 @@
+"""Audit record of one follow-up execution (per partner per level)."""
+
+from odoo import _, api, fields, models
+
+
+STATE_SELECTION = [
+    ('draft', 'Draft'),
+    ('sent', 'Sent'),
+    ('manual_review', 'Manual Review'),
+    ('skipped', 'Skipped'),
+    ('failed', 'Failed'),
+]
+
+
+class FusionFollowupRun(models.Model):
+    _name = "fusion.followup.run"
+    _description = "Fusion Follow-up Run (Per-Partner Audit)"
+    _order = "execution_date desc, id desc"
+
+    partner_id = fields.Many2one('res.partner', required=True, ondelete='cascade')
+    company_id = fields.Many2one('res.company', required=True,
+                                 default=lambda self: self.env.company)
+    level_id = fields.Many2one('fusion.followup.level', ondelete='restrict')
+
+    execution_date = fields.Datetime(default=fields.Datetime.now, required=True)
+    state = fields.Selection(STATE_SELECTION, default='draft', required=True)
+
+    overdue_amount = fields.Float()
+    longest_overdue_days = fields.Integer()
+
+    risk_score = fields.Integer()
+    risk_band = fields.Selection([
+        ('low', 'Low'), ('medium', 'Medium'),
+        ('high', 'High'), ('critical', 'Critical'),
+    ])
+
+    subject = fields.Char()
+    body = fields.Text()
+    tone_used = fields.Selection([
+        ('gentle', 'Gentle'), ('firm', 'Firm'), ('legal', 'Legal'),
+    ])
+    sent_to_email = fields.Char()
+
+    text_was_ai_generated = fields.Boolean(default=False)
+    ai_provider = fields.Char(help="LLM provider name (openai, claude, etc.) if AI was used.")
+
+    notes = fields.Text()
+    error_message = fields.Text()
+
+    def action_mark_sent(self):
+        self.write({'state': 'sent'})
+
+    def action_mark_failed(self, error: str = ''):
+        self.write({'state': 'failed', 'error_message': error})

fusion_accounting_followup/models/fusion_followup_text_cache.py

@@ -0,0 +1,60 @@
+"""Cache of AI-generated follow-up text to avoid LLM cost on repeats."""
+
+import hashlib
+
+from odoo import _, api, fields, models
+
+
+class FusionFollowupTextCache(models.Model):
+    _name = "fusion.followup.text.cache"
+    _description = "Cache of AI-generated follow-up text"
+    _order = "generated_at desc"
+
+    partner_id = fields.Many2one('res.partner', required=True, ondelete='cascade')
+    level_id = fields.Many2one('fusion.followup.level', ondelete='cascade')
+    company_id = fields.Many2one('res.company', required=True,
+                                 default=lambda self: self.env.company)
+
+    fingerprint = fields.Char(required=True, index=True,
+                              help="SHA-256 of input parameters")
+
+    subject = fields.Char()
+    body = fields.Text()
+    tone_used = fields.Selection([
+        ('gentle', 'Gentle'), ('firm', 'Firm'), ('legal', 'Legal'),
+    ])
+    key_points = fields.Json()
+
+    generated_at = fields.Datetime(default=fields.Datetime.now, required=True)
+    expires_at = fields.Datetime()
+    use_count = fields.Integer(default=0)
+    provider = fields.Char()
+
+    @api.model
+    def compute_fingerprint(self, *, partner_id: int, level_id: int,
+                            overdue_amount: float, longest_overdue_days: int,
+                            invoice_count: int, tone: str) -> str:
+        """Stable hash of the inputs that determine the generated text."""
+        s = f"{partner_id}|{level_id}|{round(overdue_amount, 2)}|" \
+            f"{longest_overdue_days}|{invoice_count}|{tone}"
+        return hashlib.sha256(s.encode('utf-8')).hexdigest()
+
+    @api.model
+    def lookup(self, *, partner_id: int, level_id: int,
+               overdue_amount: float, longest_overdue_days: int,
+               invoice_count: int, tone: str):
+        """Find a cached entry matching these inputs, or empty recordset."""
+        fp = self.compute_fingerprint(
+            partner_id=partner_id, level_id=level_id,
+            overdue_amount=overdue_amount,
+            longest_overdue_days=longest_overdue_days,
+            invoice_count=invoice_count, tone=tone,
+        )
+        return self.search([
+            ('partner_id', '=', partner_id),
+            ('fingerprint', '=', fp),
+        ], limit=1)
+
+    def action_increment_use(self):
+        for rec in self:
+            rec.use_count += 1

fusion_accounting_followup/models/fusion_migration_wizard.py

@@ -0,0 +1,87 @@
+"""Followup-specific migration step.
+
+Backfills fusion.followup.level from Enterprise's account_followup.followup.line
+records (if Enterprise account_followup is installed)."""
+
+import logging
+
+from odoo import api, fields, models
+
+_logger = logging.getLogger(__name__)
+
+
+class FusionMigrationWizard(models.TransientModel):
+    _inherit = "fusion.migration.wizard"
+
+    def _followup_bootstrap_step(self):
+        """Backfill fusion.followup.level from account_followup.followup.line."""
+        result = {
+            'step': 'followup_bootstrap',
+            'enterprise_module_present': False,
+            'created': 0, 'skipped': 0, 'errors': [],
+        }
+
+        # Enterprise's followup model — name varies by version
+        EnterpriseLine = self.env.get('account_followup.followup.line')
+        if EnterpriseLine is None:
+            EnterpriseLine = self.env.get('account.followup.line')
+        if EnterpriseLine is None:
+            result['enterprise_module_present'] = False
+            return result
+        result['enterprise_module_present'] = True
+
+        FusionLevel = self.env['fusion.followup.level'].sudo()
+        try:
+            ee_records = EnterpriseLine.sudo().search([])
+        except Exception as e:
+            result['errors'].append(f"Enterprise search failed: {e}")
+            return result
+
+        # Pick a starting offset that doesn't clash with anything already in
+        # fusion_followup_level (seeded defaults at 1..3 plus any prior
+        # migration runs). We allocate a unique sequence per Enterprise line
+        # by max(existing) + 1, ensuring idempotency + within-batch uniqueness.
+        existing_max = max(FusionLevel.search([]).mapped('sequence') or [100])
+        next_seq = max(existing_max + 1, 101)
+
+        # Map Enterprise tone-ish fields to ours
+        for ee in ee_records:
+            try:
+                raw_seq = getattr(ee, 'sequence', None) or 50
+                name = getattr(ee, 'name', None) or f"Migrated Level {raw_seq}"
+                # Idempotency: skip if a level with same name was already
+                # backfilled in a prior migration run.
+                existing = FusionLevel.search([('name', '=', name)], limit=1)
+                if existing:
+                    result['skipped'] += 1
+                    continue
+
+                delay = getattr(ee, 'delay', None) or getattr(ee, 'delay_days', 7)
+                # Enterprise tone heuristic: scale by sequence
+                tone = 'gentle' if raw_seq <= 1 else 'firm' if raw_seq <= 2 else 'legal'
+
+                with self.env.cr.savepoint():
+                    FusionLevel.create({
+                        'name': name,
+                        'sequence': next_seq,
+                        'delay_days': delay,
+                        'tone': tone,
+                        'active': True,
+                    })
+                next_seq += 1
+                result['created'] += 1
+            except Exception as e:
+                result['errors'].append(f"Line {ee.id}: {e}")
+
+        _logger.info(
+            "fusion_accounting_followup migration: %d created, %d skipped, %d errors",
+            result['created'], result['skipped'], len(result['errors']))
+        return result
+
+    def action_run_migration(self):
+        result = super().action_run_migration() if hasattr(super(), 'action_run_migration') else None
+        try:
+            self._followup_bootstrap_step()
+        except Exception as e:
+            _logger.warning("followup_bootstrap_step failed: %s", e)
+        return result

fusion_accounting_followup/models/res_partner.py

@@ -0,0 +1,52 @@
+"""Inherit res.partner: add follow-up state fields."""
+
+from odoo import _, api, fields, models
+
+
+FOLLOWUP_STATUS = [
+    ('no_action', 'No Action Needed'),
+    ('action_due', 'Action Due'),
+    ('paused', 'Paused'),
+    ('blocked', 'Blocked'),
+    ('with_credit_team', 'With Credit Team'),
+]
+
+
+class ResPartner(models.Model):
+    _inherit = "res.partner"
+
+    fusion_followup_status = fields.Selection(
+        FOLLOWUP_STATUS, default='no_action', tracking=True,
+        help="Current follow-up status as computed by the engine.")
+    fusion_followup_paused_until = fields.Date(
+        tracking=True,
+        help="Pause follow-ups for this partner until this date.")
+    fusion_followup_last_level_id = fields.Many2one(
+        'fusion.followup.level',
+        help="The most-recent follow-up level this partner has been contacted at.")
+    fusion_followup_last_run_date = fields.Datetime(readonly=True)
+    fusion_followup_run_ids = fields.One2many(
+        'fusion.followup.run', 'partner_id', string='Follow-up History')
+    fusion_followup_run_count = fields.Integer(
+        compute='_compute_fusion_followup_run_count')
+    fusion_followup_risk_score = fields.Integer(
+        readonly=True, default=0,
+        help="Latest computed payment risk (0-100). Updated by cron.")
+    fusion_followup_risk_band = fields.Selection([
+        ('low', 'Low'), ('medium', 'Medium'),
+        ('high', 'High'), ('critical', 'Critical'),
+    ], default='low', readonly=True)
+
+    def _compute_fusion_followup_run_count(self):
+        for partner in self:
+            partner.fusion_followup_run_count = len(partner.fusion_followup_run_ids)
+
+    def action_view_followup_history(self):
+        self.ensure_one()
+        return {
+            'type': 'ir.actions.act_window',
+            'res_model': 'fusion.followup.run',
+            'view_mode': 'list,form',
+            'domain': [('partner_id', '=', self.id)],
+            'context': {'default_partner_id': self.id},
+        }

fusion_accounting_followup/security/ir.model.access.csv

@@ -0,0 +1,8 @@
+id,name,model_id:id,group_id:id,perm_read,perm_write,perm_create,perm_unlink
+access_fusion_followup_level_user,fusion.followup.level.user,model_fusion_followup_level,base.group_user,1,0,0,0
+access_fusion_followup_level_admin,fusion.followup.level.admin,model_fusion_followup_level,fusion_accounting_core.group_fusion_accounting_admin,1,1,1,1
+access_fusion_followup_run_user,fusion.followup.run.user,model_fusion_followup_run,base.group_user,1,0,0,0
+access_fusion_followup_run_admin,fusion.followup.run.admin,model_fusion_followup_run,fusion_accounting_core.group_fusion_accounting_admin,1,1,1,1
+access_fusion_followup_text_cache_user,fusion.followup.text.cache.user,model_fusion_followup_text_cache,base.group_user,1,0,0,0
+access_fusion_followup_text_cache_admin,fusion.followup.text.cache.admin,model_fusion_followup_text_cache,fusion_accounting_core.group_fusion_accounting_admin,1,1,1,1
+access_fusion_batch_followup_wizard_user,fusion.batch.followup.wizard.user,model_fusion_batch_followup_wizard,base.group_user,1,1,1,0

fusion_accounting_followup/services/__init__.py

@@ -0,0 +1,6 @@
+from . import overdue_aging
+from . import level_resolver
+from . import risk_scorer
+from . import tone_selector
+from . import followup_text_prompt
+from . import followup_text_generator

fusion_accounting_followup/services/followup_text_generator.py

@@ -0,0 +1,123 @@
+"""AI-generated follow-up text with templated fallback."""
+
+import json
+import logging
+
+_logger = logging.getLogger(__name__)
+
+
+TEMPLATES = {
+    'gentle': {
+        'subject': 'Friendly reminder: invoice payment',
+        'body': 'Dear {partner_name},\n\nThis is a friendly reminder that you have '
+                '{currency_code} {total_overdue:,.2f} outstanding on invoices that '
+                'are now {longest_overdue_days} days past due. We understand things '
+                'happen — please let us know if there is anything we can do to help '
+                'resolve this.\n\nBest regards.',
+    },
+    'firm': {
+        'subject': 'Outstanding invoices — action required',
+        'body': 'Dear {partner_name},\n\nOur records show {currency_code} '
+                '{total_overdue:,.2f} outstanding on {invoice_count} invoice(s), '
+                'with the longest now {longest_overdue_days} days overdue. We '
+                'request immediate payment to avoid further action.\n\nRegards.',
+    },
+    'legal': {
+        'subject': 'FINAL NOTICE — outstanding balance',
+        'body': 'Dear {partner_name},\n\nDespite previous reminders, '
+                '{currency_code} {total_overdue:,.2f} remains outstanding on your '
+                'account, with the longest invoice {longest_overdue_days} days '
+                'overdue. If full payment is not received within 7 days, we will '
+                'be forced to refer this matter for legal collection.\n\n'
+                'Regards.',
+    },
+}
+
+
+def generate_followup_text(env, *, partner_name: str, total_overdue: float,
+                              currency_code: str, longest_overdue_days: int,
+                              tone: str, invoice_count: int = 0,
+                              last_payment_date: str = None,
+                              risk_drivers: list[str] = None,
+                              provider=None) -> dict:
+    """Generate follow-up text via LLM, with templated fallback.
+
+    Returns: {subject, body, tone_used, key_points}"""
+    if provider is None:
+        provider = _get_provider(env)
+    if provider is None:
+        return _templated_fallback(
+            partner_name=partner_name, total_overdue=total_overdue,
+            currency_code=currency_code,
+            longest_overdue_days=longest_overdue_days,
+            tone=tone, invoice_count=invoice_count,
+        )
+
+    try:
+        from .followup_text_prompt import build_prompt
+        system, user = build_prompt(
+            partner_name=partner_name, total_overdue=total_overdue,
+            currency_code=currency_code,
+            longest_overdue_days=longest_overdue_days, tone=tone,
+            invoice_count=invoice_count, last_payment_date=last_payment_date,
+            risk_drivers=risk_drivers,
+        )
+        response = provider.complete(
+            system=system,
+            messages=[{'role': 'user', 'content': user}],
+            max_tokens=800, temperature=0.3,
+        )
+        content = response.get('content') if isinstance(response, dict) else response
+        parsed = json.loads(content)
+        for key in ('subject', 'body', 'tone_used'):
+            if key not in parsed:
+                raise ValueError(f"Missing key: {key}")
+        parsed.setdefault('key_points', [])
+        return parsed
+    except Exception as e:
+        _logger.warning("Follow-up text LLM generation failed (%s); falling back", e)
+        return _templated_fallback(
+            partner_name=partner_name, total_overdue=total_overdue,
+            currency_code=currency_code,
+            longest_overdue_days=longest_overdue_days,
+            tone=tone, invoice_count=invoice_count,
+        )
+
+
+def _templated_fallback(*, partner_name, total_overdue, currency_code,
+                          longest_overdue_days, tone, invoice_count) -> dict:
+    template = TEMPLATES.get(tone, TEMPLATES['gentle'])
+    return {
+        'subject': template['subject'],
+        'body': template['body'].format(
+            partner_name=partner_name, total_overdue=total_overdue,
+            currency_code=currency_code,
+            longest_overdue_days=longest_overdue_days,
+            invoice_count=invoice_count or 0,
+        ),
+        'tone_used': tone,
+        'key_points': [
+            f"${total_overdue:,.2f} outstanding",
+            f"{longest_overdue_days} days overdue",
+        ],
+    }
+
+
+def _get_provider(env):
+    """Look up provider for 'followup_text' feature."""
+    param = env['ir.config_parameter'].sudo()
+    name = param.get_param('fusion_accounting.provider.followup_text')
+    if not name:
+        name = param.get_param('fusion_accounting.provider.default')
+    if not name:
+        return None
+    try:
+        from odoo.addons.fusion_accounting_ai.services.adapters.openai_adapter import OpenAIAdapter
+        from odoo.addons.fusion_accounting_ai.services.adapters.claude import ClaudeAdapter
+    except ImportError:
+        return None
+    if name.startswith('openai'):
+        return OpenAIAdapter(env)
+    elif name.startswith('claude'):
+        return ClaudeAdapter(env)
+    return None

fusion_accounting_followup/services/followup_text_prompt.py

@@ -0,0 +1,56 @@
+"""LLM prompt for AI-generated follow-up text.
+
+Output contract: {
+  "subject": str,
+  "body": str,
+  "tone_used": str,
+  "key_points": [str, ...]
+}"""
+
+
+SYSTEM_PROMPT = """You are an experienced credit collections specialist writing a
+follow-up email for an unpaid invoice. Output MUST be valid JSON of this
+exact shape:
+
+{
+  "subject": "<email subject line>",
+  "body": "<plain-text or simple HTML body, no <html> wrapper>",
+  "tone_used": "gentle" | "firm" | "legal",
+  "key_points": ["<point 1>", "<point 2>", ...]
+}
+
+Tone guide:
+- gentle: friendly reminder, assume oversight, propose easy paths to pay
+- firm: state amount + days overdue clearly, request immediate action,
+  hint at consequences
+- legal: formal language, reference contract obligations, mention possible
+  legal action / collections agency, demand payment by specific date
+
+Always:
+- Use the actual amounts and partner name from the data provided
+- Don't invent contract terms or interest rates
+- Don't include markdown code fences
+- No prose outside the JSON
+"""
+
+
+def build_prompt(*, partner_name: str, total_overdue: float, currency_code: str,
+                   longest_overdue_days: int, tone: str,
+                   invoice_count: int = 0, last_payment_date: str = None,
+                   risk_drivers: list[str] = None) -> tuple[str, str]:
+    parts = [
+        f"PARTNER: {partner_name}",
+        f"TOTAL OVERDUE: {currency_code} {total_overdue:,.2f}",
+        f"LONGEST OVERDUE: {longest_overdue_days} days",
+        f"OPEN INVOICE COUNT: {invoice_count}",
+        f"REQUESTED TONE: {tone}",
+    ]
+    if last_payment_date:
+        parts.append(f"LAST PAYMENT: {last_payment_date}")
+    if risk_drivers:
+        parts.append("RISK FACTORS:")
+        for d in risk_drivers[:5]:
+            parts.append(f"  - {d}")
+    parts.append("")
+    parts.append("Write the follow-up email per the system prompt.")
+    return (SYSTEM_PROMPT, "\n".join(parts))

fusion_accounting_followup/services/level_resolver.py

@@ -0,0 +1,52 @@
+"""Level resolver: which follow-up level should fire for this partner?
+
+Pure-Python: caller passes the aging report + the configured levels list,
+and we pick the highest-numbered level whose threshold is met."""
+
+from dataclasses import dataclass
+
+
+@dataclass
+class FollowupLevelSpec:
+    sequence: int
+    name: str
+    delay_days: int
+    tone: str
+
+    def __post_init__(self):
+        if self.tone not in ('gentle', 'firm', 'legal'):
+            raise ValueError(f"Invalid tone: {self.tone}")
+
+
+def resolve_level(*, aging_report, levels: list[FollowupLevelSpec]) -> FollowupLevelSpec | None:
+    """Pick the highest-sequence level whose delay_days has been crossed by
+    the most-overdue line in the aging report. Returns None if no overdue
+    lines or no levels configured."""
+    if not levels or not aging_report:
+        return None
+    max_days_overdue = _max_days_overdue(aging_report)
+    if max_days_overdue <= 0:
+        return None
+    levels_sorted = sorted(levels, key=lambda l: l.sequence, reverse=True)
+    for level in levels_sorted:
+        if level.delay_days <= max_days_overdue:
+            return level
+    return None
+
+
+def _max_days_overdue(aging_report) -> int:
+    """Return the actual max days-overdue tracked on the report, falling
+    back to the highest populated bucket's lower bound when an older
+    aging report (without `max_days_overdue`) is passed in."""
+    tracked = getattr(aging_report, 'max_days_overdue', 0) or 0
+    if tracked:
+        return tracked
+    max_days = 0
+    for b in aging_report.buckets:
+        if b.name == 'current' or b.amount <= 0:
+            continue
+        if b.days_max is None:
+            max_days = max(max_days, b.days_min)
+        else:
+            max_days = max(max_days, b.days_min)
+    return max_days

fusion_accounting_followup/services/overdue_aging.py

@@ -0,0 +1,92 @@
+"""Aging bucket primitives.
+
+Pure-Python: callers pass a list of move-line dicts with `date_maturity`
+and `amount_residual`; we bucket them into 0/30/60/90/120+ days overdue."""
+
+from dataclasses import dataclass, field
+from datetime import date
+
+
+BUCKETS = [
+    ('current', 0, 0),
+    ('1_30', 1, 30),
+    ('31_60', 31, 60),
+    ('61_90', 61, 90),
+    ('91_120', 91, 120),
+    ('120_plus', 121, None),
+]
+
+
+@dataclass
+class AgingBucket:
+    name: str
+    days_min: int
+    days_max: int | None
+    amount: float = 0.0
+    line_count: int = 0
+
+
+@dataclass
+class AgingReport:
+    as_of: date
+    buckets: list[AgingBucket] = field(default_factory=list)
+    total_amount: float = 0.0
+    total_overdue_amount: float = 0.0
+    line_count: int = 0
+    max_days_overdue: int = 0
+
+    def to_dict(self):
+        return {
+            'as_of': str(self.as_of),
+            'total_amount': self.total_amount,
+            'total_overdue_amount': self.total_overdue_amount,
+            'line_count': self.line_count,
+            'max_days_overdue': self.max_days_overdue,
+            'buckets': [{
+                'name': b.name, 'days_min': b.days_min, 'days_max': b.days_max,
+                'amount': b.amount, 'line_count': b.line_count,
+            } for b in self.buckets],
+        }
+
+
+def compute_aging(*, move_lines: list[dict], as_of: date | None = None) -> AgingReport:
+    """Bucket move-line dicts into aging brackets.
+
+    Each dict needs: date_maturity (date), amount_residual (float).
+    `as_of` defaults to today."""
+    as_of = as_of or date.today()
+    report = AgingReport(as_of=as_of)
+    for name, days_min, days_max in BUCKETS:
+        report.buckets.append(AgingBucket(name=name, days_min=days_min, days_max=days_max))
+
+    for ml in move_lines:
+        maturity = ml.get('date_maturity')
+        amount = ml.get('amount_residual', 0.0)
+        if not maturity:
+            continue
+        days_overdue = (as_of - maturity).days
+        bucket = _find_bucket(report.buckets, days_overdue)
+        if bucket:
+            bucket.amount += amount
+            bucket.line_count += 1
+        report.total_amount += amount
+        if days_overdue > 0:
+            report.total_overdue_amount += amount
+            if days_overdue > report.max_days_overdue:
+                report.max_days_overdue = days_overdue
+        report.line_count += 1
+
+    return report
+
+
+def _find_bucket(buckets: list[AgingBucket], days_overdue: int) -> AgingBucket | None:
+    if days_overdue <= 0:
+        return next((b for b in buckets if b.name == 'current'), None)
+    for b in buckets:
+        if b.name == 'current':
+            continue
+        if b.days_max is None and days_overdue >= b.days_min:
+            return b
+        if b.days_max is not None and b.days_min <= days_overdue <= b.days_max:
+            return b
+    return None

fusion_accounting_followup/services/risk_scorer.py

@@ -0,0 +1,62 @@
+"""Payment-history risk scorer.
+
+Pure-Python: takes payment history (list of payment events) + average days-late
+and returns a risk score 0-100. Higher = more risky."""
+
+from dataclasses import dataclass
+
+
+@dataclass
+class PartnerRiskScore:
+    score: int
+    band: str
+    drivers: list[str]
+
+
+def score_partner(*, total_invoices: int = 0, paid_late_count: int = 0,
+                    avg_days_late: float = 0.0,
+                    longest_overdue_days: int = 0,
+                    open_overdue_amount: float = 0.0,
+                    average_invoice_amount: float = 1000.0) -> PartnerRiskScore:
+    """Compute a 0-100 risk score from payment-history primitives.
+
+    Heuristic weights:
+    - 30% : late-payment ratio (paid_late_count / total_invoices)
+    - 25% : avg days late (capped at 60 days)
+    - 25% : longest current overdue (capped at 120 days)
+    - 20% : open overdue amount as multiple of average invoice
+    """
+    drivers: list[str] = []
+    score = 0.0
+
+    if total_invoices > 0:
+        late_ratio = paid_late_count / total_invoices
+        score += min(late_ratio * 100, 100) * 0.30
+        if late_ratio > 0.5:
+            drivers.append(f"{paid_late_count}/{total_invoices} invoices paid late")
+
+    score += min(avg_days_late / 60, 1) * 100 * 0.25
+    if avg_days_late > 14:
+        drivers.append(f"Avg {avg_days_late:.1f} days late on payment")
+
+    score += min(longest_overdue_days / 120, 1) * 100 * 0.25
+    if longest_overdue_days > 30:
+        drivers.append(f"Longest currently overdue: {longest_overdue_days} days")
+
+    if average_invoice_amount > 0:
+        ratio = open_overdue_amount / average_invoice_amount
+        score += min(ratio / 5, 1) * 100 * 0.20
+        if ratio > 1.5:
+            drivers.append(f"Open overdue ${open_overdue_amount:,.2f} ({ratio:.1f}x avg invoice)")
+
+    final = int(round(score))
+    if final >= 80:
+        band = 'critical'
+    elif final >= 60:
+        band = 'high'
+    elif final >= 30:
+        band = 'medium'
+    else:
+        band = 'low'
+
+    return PartnerRiskScore(score=final, band=band, drivers=drivers)

fusion_accounting_followup/services/tone_selector.py

@@ -0,0 +1,18 @@
+"""Tone selector: pick gentle/firm/legal based on follow-up level + risk score."""
+
+TONE_BY_LEVEL = {
+    1: 'gentle',
+    2: 'firm',
+    3: 'legal',
+    4: 'legal',
+}
+
+
+def select_tone(*, level_sequence: int, risk_score: int = 0) -> str:
+    """Default tone follows level sequence; high risk can escalate."""
+    base_tone = TONE_BY_LEVEL.get(level_sequence, 'gentle')
+    if risk_score >= 80 and base_tone == 'gentle':
+        return 'firm'
+    if risk_score >= 90 and base_tone == 'firm':
+        return 'legal'
+    return base_tone

fusion_accounting_followup/static/src/components/aging_bucket_strip/aging_bucket_strip.js

@@ -0,0 +1,15 @@
+/** @odoo-module **/
+
+import { Component } from "@odoo/owl";
+
+export class AgingBucketStrip extends Component {
+    static template = "fusion_accounting_followup.AgingBucketStrip";
+    static props = {
+        aging: { type: Object },
+    };
+
+    bucketWidth(bucket) {
+        const total = this.props.aging.total_amount || 1;
+        return ((bucket.amount / total) * 100).toFixed(2) + "%";
+    }
+}

fusion_accounting_followup/static/src/components/aging_bucket_strip/aging_bucket_strip.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<templates xml:space="preserve">
+
+<t t-name="fusion_accounting_followup.AgingBucketStrip">
+    <div class="mt-2">
+        <div class="fu-aging-strip">
+            <div t-foreach="props.aging.buckets" t-as="b" t-key="b.name"
+                 class="bucket" t-att-data-name="b.name"
+                 t-att-style="'width: ' + bucketWidth(b)"
+                 t-att-title="b.name + ': $' + (b.amount or 0).toFixed(2)"/>
+        </div>
+        <div class="d-flex justify-content-between text-muted" style="font-size: 0.7rem;">
+            <span>Current</span>
+            <span>30</span>
+            <span>60</span>
+            <span>90</span>
+            <span>120+</span>
+        </div>
+    </div>
+</t>
+
+</templates>

fusion_accounting_followup/static/src/components/ai_text_panel/ai_text_panel.js

@@ -0,0 +1,10 @@
+/** @odoo-module **/
+
+import { Component } from "@odoo/owl";
+
+export class AiTextPanel extends Component {
+    static template = "fusion_accounting_followup.AiTextPanel";
+    static props = {
+        text: { type: Object },
+    };
+}

fusion_accounting_followup/static/src/components/ai_text_panel/ai_text_panel.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<templates xml:space="preserve">
+
+<t t-name="fusion_accounting_followup.AiTextPanel">
+    <div class="fu-ai-text-panel mt-3">
+        <h5>AI-Generated Follow-up Text</h5>
+        <div class="ai-subject">
+            Subject: <t t-esc="props.text.subject"/>
+        </div>
+        <div class="ai-body">
+            <t t-esc="props.text.body"/>
+        </div>
+        <div class="key-points" t-if="props.text.key_points and props.text.key_points.length">
+            <strong>Key points:</strong>
+            <ul>
+                <li t-foreach="props.text.key_points" t-as="point" t-key="point_index">
+                    <t t-esc="point"/>
+                </li>
+            </ul>
+        </div>
+        <div class="text-muted mt-2" style="font-size: 0.75rem;">
+            Tone used: <t t-esc="props.text.tone_used or props.text.tone or 'gentle'"/>
+        </div>
+    </div>
+</t>
+
+</templates>

fusion_accounting_followup/static/src/components/followup_history_table/followup_history_table.js

@@ -0,0 +1,15 @@
+/** @odoo-module **/
+
+import { Component } from "@odoo/owl";
+
+export class FollowupHistoryTable extends Component {
+    static template = "fusion_accounting_followup.FollowupHistoryTable";
+    static props = {
+        history: { type: Object },
+    };
+
+    formatDate(s) {
+        if (!s) return "";
+        return s.slice(0, 10);
+    }
+}

fusion_accounting_followup/static/src/components/followup_history_table/followup_history_table.xml

@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<templates xml:space="preserve">
+
+<t t-name="fusion_accounting_followup.FollowupHistoryTable">
+    <div class="mt-4">
+        <h5>Follow-up History (<t t-esc="props.history.count or 0"/>)</h5>
+        <table t-if="props.history.runs and props.history.runs.length" class="fu-history-table">
+            <thead>
+                <tr>
+                    <th>Date</th>
+                    <th>Level</th>
+                    <th>Tone</th>
+                    <th>State</th>
+                    <th class="text-end">Overdue</th>
+                </tr>
+            </thead>
+            <tbody>
+                <tr t-foreach="props.history.runs" t-as="run" t-key="run.id">
+                    <td><t t-esc="formatDate(run.date)"/></td>
+                    <td><t t-esc="run.level_name or '-'"/></td>
+                    <td><t t-esc="run.tone_used or '-'"/></td>
+                    <td><t t-esc="run.state"/></td>
+                    <td class="text-end">
+                        <t t-if="run.overdue_amount">$<t t-esc="run.overdue_amount.toFixed(2)"/></t>
+                    </td>
+                </tr>
+            </tbody>
+        </table>
+        <div t-else="" class="text-muted">No history yet.</div>
+    </div>
+</t>
+
+</templates>

fusion_accounting_followup/static/src/components/partner_card/partner_card.js

@@ -0,0 +1,15 @@
+/** @odoo-module **/
+
+import { Component } from "@odoo/owl";
+import { RiskBadge } from "../risk_badge/risk_badge";
+
+export class PartnerCard extends Component {
+    static template = "fusion_accounting_followup.PartnerCard";
+    static props = {
+        partner: { type: Object },
+        selected: { type: Boolean, optional: true },
+        onSelect: { type: Function },
+        formatCurrency: { type: Function },
+    };
+    static components = { RiskBadge };
+}

fusion_accounting_followup/static/src/components/partner_card/partner_card.xml

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<templates xml:space="preserve">
+
+<t t-name="fusion_accounting_followup.PartnerCard">
+    <div class="o_fusion_followup_card"
+         t-att-class="props.selected ? 'selected' : ''"
+         t-on-click="props.onSelect">
+        <div class="o_fusion_followup_card_header">
+            <div class="partner-name"><t t-esc="props.partner.partner_name"/></div>
+            <div>
+                <span class="fu-status-badge" t-att-data-status="props.partner.status">
+                    <t t-esc="props.partner.status"/>
+                </span>
+            </div>
+        </div>
+        <div class="partner-numbers">
+            <div>
+                <span class="label">Overdue:</span>
+                <span class="value">$<t t-esc="props.formatCurrency(props.partner.overdue_amount)"/></span>
+            </div>
+            <div>
+                <span class="label">Lines:</span>
+                <span class="value"><t t-esc="props.partner.overdue_line_count or 0"/></span>
+            </div>
+            <div>
+                <span class="label">Risk:</span>
+                <RiskBadge band="props.partner.risk_band" score="props.partner.risk_score"/>
+            </div>
+            <div t-if="props.partner.last_level_name">
+                <span class="label">Last:</span>
+                <span class="value"><t t-esc="props.partner.last_level_name"/></span>
+            </div>
+        </div>
+    </div>
+</t>
+
+</templates>

fusion_accounting_followup/static/src/components/risk_badge/risk_badge.js

@@ -0,0 +1,11 @@
+/** @odoo-module **/
+
+import { Component } from "@odoo/owl";
+
+export class RiskBadge extends Component {
+    static template = "fusion_accounting_followup.RiskBadge";
+    static props = {
+        band: { type: String, optional: true },
+        score: { type: Number, optional: true },
+    };
+}

fusion_accounting_followup/static/src/components/risk_badge/risk_badge.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<templates xml:space="preserve">
+
+<t t-name="fusion_accounting_followup.RiskBadge">
+    <span class="fu-risk-badge" t-att-data-band="props.band || 'low'">
+        <t t-esc="props.band || 'low'"/>
+        <t t-if="props.score !== undefined"> (<t t-esc="props.score"/>)</t>
+    </span>
+</t>
+
+</templates>

fusion_accounting_followup/static/src/scss/_variables.scss

@@ -0,0 +1,51 @@
+// Fusion follow-up design tokens (extends Phases 1-3 tokens for consistency).
+
+$fu-bg-primary: #ffffff;
+$fu-bg-secondary: #f9fafb;
+$fu-bg-tertiary: #f3f4f6;
+$fu-border: #e5e7eb;
+$fu-text-primary: #111827;
+$fu-text-secondary: #6b7280;
+$fu-text-muted: #9ca3af;
+$fu-accent: #3b82f6;
+$fu-accent-bg: #eff6ff;
+
+// Status colors
+$fu-status-no-action: #6b7280;
+$fu-status-action-due: #f59e0b;
+$fu-status-paused: #6366f1;
+$fu-status-blocked: #ef4444;
+$fu-status-with-credit: #8b5cf6;
+
+// Risk band colors
+$fu-risk-low: #10b981;
+$fu-risk-low-bg: #ecfdf5;
+$fu-risk-medium: #f59e0b;
+$fu-risk-medium-bg: #fffbeb;
+$fu-risk-high: #ef4444;
+$fu-risk-high-bg: #fef2f2;
+$fu-risk-critical: #b91c1c;
+$fu-risk-critical-bg: #fef2f2;
+
+// Aging bucket colors (escalating intensity)
+$fu-bucket-current: #10b981;
+$fu-bucket-1-30: #fbbf24;
+$fu-bucket-31-60: #f59e0b;
+$fu-bucket-61-90: #ef4444;
+$fu-bucket-91-120: #dc2626;
+$fu-bucket-120-plus: #7f1d1d;
+
+$fu-space-1: 0.25rem;
+$fu-space-2: 0.5rem;
+$fu-space-3: 0.75rem;
+$fu-space-4: 1rem;
+$fu-space-6: 1.5rem;
+
+$fu-font-size-xs: 0.75rem;
+$fu-font-size-sm: 0.875rem;
+$fu-font-size-base: 1rem;
+$fu-font-size-lg: 1.125rem;
+$fu-font-size-xl: 1.25rem;
+
+$fu-border-radius: 0.375rem;
+$fu-border-radius-md: 0.5rem;

fusion_accounting_followup/static/src/scss/dark_mode.scss

@@ -0,0 +1,27 @@
+// Variables come from _variables.scss (loaded first in the asset bundle).
+
+[data-color-scheme="dark"] .o_fusion_followup {
+    background: #1f2937; color: #f9fafb;
+
+    &_header, &_card, .fu-ai-text-panel {
+        background: #111827; border-color: #374151; color: #f9fafb;
+    }
+
+    &_card {
+        &:hover { border-color: #60a5fa; }
+        &.selected { background: #1e3a8a; border-color: #60a5fa; }
+        .partner-numbers .label { color: #9ca3af; }
+        .partner-numbers .value { color: #f9fafb; }
+    }
+
+    .btn_fu {
+        background: #374151; border-color: #4b5563; color: #f9fafb;
+        &:hover { background: #4b5563; }
+        &.primary { background: #3b82f6; }
+    }
+
+    .fu-ai-text-panel {
+        .ai-subject { background: #1e3a8a; }
+        .ai-body { background: #1f2937; }
+    }
+}

fusion_accounting_followup/static/src/scss/followup.scss

@@ -0,0 +1,190 @@
+// Variables come from _variables.scss (loaded first in the asset bundle).
+
+.o_fusion_followup {
+    background: $fu-bg-secondary;
+    min-height: 100vh;
+
+    &_header {
+        background: $fu-bg-primary;
+        border-bottom: 1px solid $fu-border;
+        padding: $fu-space-4 $fu-space-6;
+        display: flex;
+        justify-content: space-between;
+        align-items: center;
+
+        h1 { font-size: $fu-font-size-xl; margin: 0; }
+
+        .summary {
+            display: flex;
+            gap: $fu-space-6;
+            font-size: $fu-font-size-sm;
+            color: $fu-text-secondary;
+
+            .summary-value {
+                font-weight: 600;
+                color: $fu-text-primary;
+                margin-left: $fu-space-1;
+            }
+        }
+    }
+
+    &_card {
+        background: $fu-bg-primary;
+        border: 1px solid $fu-border;
+        border-radius: $fu-border-radius-md;
+        padding: $fu-space-4;
+        margin-bottom: $fu-space-3;
+        cursor: pointer;
+        transition: all 200ms ease-in-out;
+
+        &:hover {
+            border-color: $fu-accent;
+            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
+        }
+
+        &.selected {
+            border-color: $fu-accent;
+            background: $fu-accent-bg;
+        }
+
+        &_header {
+            display: flex;
+            justify-content: space-between;
+            align-items: flex-start;
+            margin-bottom: $fu-space-2;
+
+            .partner-name {
+                font-weight: 600;
+                font-size: $fu-font-size-base;
+            }
+        }
+
+        .partner-numbers {
+            display: grid;
+            grid-template-columns: 1fr 1fr;
+            gap: $fu-space-2;
+            font-size: $fu-font-size-sm;
+            color: $fu-text-secondary;
+
+            .label { font-weight: 500; margin-right: $fu-space-2; }
+            .value { color: $fu-text-primary; font-weight: 500; }
+        }
+    }
+
+    .btn_fu {
+        padding: $fu-space-2 $fu-space-4;
+        border-radius: $fu-border-radius;
+        background: $fu-bg-primary;
+        border: 1px solid $fu-border;
+        color: $fu-text-primary;
+        font-size: $fu-font-size-sm;
+        cursor: pointer;
+
+        &:hover { background: $fu-bg-tertiary; }
+        &.primary { background: $fu-accent; border-color: $fu-accent; color: white;
+                      &:hover { background: darken($fu-accent, 8%); } }
+        &.danger { background: $fu-status-blocked; border-color: $fu-status-blocked; color: white; }
+    }
+}
+
+.fu-status-badge {
+    padding: $fu-space-1 $fu-space-2;
+    border-radius: $fu-border-radius;
+    font-size: $fu-font-size-xs;
+    font-weight: 500;
+    text-transform: uppercase;
+
+    &[data-status="no_action"] { background: lighten($fu-status-no-action, 40%); color: $fu-status-no-action; }
+    &[data-status="action_due"] { background: lighten($fu-status-action-due, 35%); color: $fu-status-action-due; }
+    &[data-status="paused"] { background: lighten($fu-status-paused, 35%); color: $fu-status-paused; }
+    &[data-status="blocked"] { background: lighten($fu-status-blocked, 35%); color: $fu-status-blocked; }
+    &[data-status="with_credit_team"] { background: lighten($fu-status-with-credit, 35%); color: $fu-status-with-credit; }
+}
+
+.fu-risk-badge {
+    display: inline-flex;
+    align-items: center;
+    padding: $fu-space-1 $fu-space-2;
+    border-radius: $fu-border-radius;
+    font-weight: 600;
+    font-size: $fu-font-size-xs;
+
+    &[data-band="low"] { background: $fu-risk-low-bg; color: $fu-risk-low; }
+    &[data-band="medium"] { background: $fu-risk-medium-bg; color: $fu-risk-medium; }
+    &[data-band="high"] { background: $fu-risk-high-bg; color: $fu-risk-high; }
+    &[data-band="critical"] { background: $fu-risk-critical-bg; color: $fu-risk-critical; font-weight: 700; }
+}
+
+.fu-aging-strip {
+    display: flex;
+    gap: 2px;
+    height: 8px;
+    border-radius: $fu-border-radius;
+    overflow: hidden;
+    margin: $fu-space-2 0;
+
+    .bucket {
+        height: 100%;
+
+        &[data-name="current"] { background: $fu-bucket-current; }
+        &[data-name="1_30"] { background: $fu-bucket-1-30; }
+        &[data-name="31_60"] { background: $fu-bucket-31-60; }
+        &[data-name="61_90"] { background: $fu-bucket-61-90; }
+        &[data-name="91_120"] { background: $fu-bucket-91-120; }
+        &[data-name="120_plus"] { background: $fu-bucket-120-plus; }
+    }
+}
+
+.fu-ai-text-panel {
+    background: $fu-bg-primary;
+    border: 1px solid $fu-border;
+    border-radius: $fu-border-radius-md;
+    padding: $fu-space-4;
+
+    h5 { margin: 0 0 $fu-space-2; font-size: $fu-font-size-base; }
+
+    .ai-subject {
+        font-weight: 600;
+        margin-bottom: $fu-space-2;
+        padding: $fu-space-2;
+        background: $fu-accent-bg;
+        border-radius: $fu-border-radius;
+    }
+
+    .ai-body {
+        white-space: pre-wrap;
+        font-family: monospace;
+        font-size: $fu-font-size-sm;
+        padding: $fu-space-3;
+        background: $fu-bg-secondary;
+        border-radius: $fu-border-radius;
+        max-height: 300px;
+        overflow-y: auto;
+    }
+
+    .key-points {
+        margin-top: $fu-space-3;
+        font-size: $fu-font-size-sm;
+        color: $fu-text-secondary;
+
+        ul { margin: 0; padding-left: $fu-space-4; }
+    }
+}
+
+.fu-history-table {
+    width: 100%;
+    font-size: $fu-font-size-sm;
+
+    th {
+        background: $fu-bg-tertiary;
+        padding: $fu-space-2 $fu-space-3;
+        text-align: left;
+        font-weight: 600;
+        color: $fu-text-secondary;
+    }
+
+    td {
+        padding: $fu-space-2 $fu-space-3;
+        border-bottom: 1px solid lighten($fu-border, 5%);
+    }
+}

fusion_accounting_followup/static/src/services/followup_service.js

@@ -0,0 +1,145 @@
+/** @odoo-module **/
+
+import { registry } from "@web/core/registry";
+import { reactive } from "@odoo/owl";
+
+const ENDPOINT_BASE = "/fusion/followup";
+
+export class FollowupService {
+    constructor(env, services) {
+        this.env = env;
+        this.rpc = services.rpc;
+        this.notification = services.notification;
+
+        this.state = reactive({
+            partners: [],
+            count: 0,
+            total: 0,
+            statusFilter: null,
+            isLoading: false,
+            isProcessing: false,
+            selectedPartnerId: null,
+            selectedDetail: null,
+            companyId: null,
+            limit: 50,
+            offset: 0,
+            generatedText: null,
+        });
+    }
+
+    async loadOverdue(companyId = null) {
+        this.state.companyId = companyId;
+        this.state.isLoading = true;
+        try {
+            const result = await this.rpc(`${ENDPOINT_BASE}/list_overdue`, {
+                status: this.state.statusFilter,
+                limit: this.state.limit,
+                offset: this.state.offset,
+                company_id: companyId,
+            });
+            this.state.partners = result.partners;
+            this.state.count = result.count;
+            this.state.total = result.total;
+        } finally {
+            this.state.isLoading = false;
+        }
+    }
+
+    async selectPartner(partnerId) {
+        this.state.selectedPartnerId = partnerId;
+        this.state.selectedDetail = null;
+        this.state.generatedText = null;
+        try {
+            this.state.selectedDetail = await this.rpc(`${ENDPOINT_BASE}/get_partner_detail`, {
+                partner_id: partnerId,
+            });
+        } catch (err) {
+            this.notification.add(`Failed to load partner detail: ${err.message || err}`, { type: "danger" });
+        }
+    }
+
+    async generateText(partnerId, levelId = null, forceRegenerate = false) {
+        this.state.isProcessing = true;
+        try {
+            this.state.generatedText = await this.rpc(`${ENDPOINT_BASE}/generate_text`, {
+                partner_id: partnerId, level_id: levelId,
+                force_regenerate: forceRegenerate,
+            });
+            return this.state.generatedText;
+        } catch (err) {
+            this.notification.add(`Generate failed: ${err.message || err}`, { type: "danger" });
+            throw err;
+        } finally {
+            this.state.isProcessing = false;
+        }
+    }
+
+    async sendFollowup(partnerId, levelId = null, force = false) {
+        this.state.isProcessing = true;
+        try {
+            const result = await this.rpc(`${ENDPOINT_BASE}/send`, {
+                partner_id: partnerId, level_id: levelId, force: force,
+            });
+            const status = result.status || "unknown";
+            const type = status === "sent" ? "success" : status.startsWith("paused") ? "warning" : "info";
+            this.notification.add(`Send result: ${status}`, { type: type });
+            if (this.state.selectedPartnerId === partnerId) {
+                await this.selectPartner(partnerId);
+            }
+            await this.loadOverdue(this.state.companyId);
+            return result;
+        } catch (err) {
+            this.notification.add(`Send failed: ${err.message || err}`, { type: "danger" });
+            throw err;
+        } finally {
+            this.state.isProcessing = false;
+        }
+    }
+
+    async pausePartner(partnerId, untilDate = null) {
+        try {
+            const result = await this.rpc(`${ENDPOINT_BASE}/pause`, {
+                partner_id: partnerId, until_date: untilDate,
+            });
+            this.notification.add(`Paused until ${result.paused_until}`, { type: "info" });
+            if (this.state.selectedPartnerId === partnerId) {
+                await this.selectPartner(partnerId);
+            }
+            await this.loadOverdue(this.state.companyId);
+            return result;
+        } catch (err) {
+            this.notification.add(`Pause failed: ${err.message || err}`, { type: "danger" });
+            throw err;
+        }
+    }
+
+    async resetPartner(partnerId) {
+        try {
+            const result = await this.rpc(`${ENDPOINT_BASE}/reset`, {
+                partner_id: partnerId,
+            });
+            this.notification.add(`Reset`, { type: "info" });
+            if (this.state.selectedPartnerId === partnerId) {
+                await this.selectPartner(partnerId);
+            }
+            await this.loadOverdue(this.state.companyId);
+            return result;
+        } catch (err) {
+            this.notification.add(`Reset failed: ${err.message || err}`, { type: "danger" });
+            throw err;
+        }
+    }
+
+    setStatusFilter(status) {
+        this.state.statusFilter = status;
+        this.state.offset = 0;
+        this.loadOverdue(this.state.companyId);
+    }
+}
+
+export const followupService = {
+    dependencies: ["rpc", "notification"],
+    start(env, services) { return new FollowupService(env, services); },
+};
+
+registry.category("services").add("fusion_followup", followupService);

fusion_accounting_followup/static/src/views/followup_dashboard/followup_dashboard.js

@@ -0,0 +1,69 @@
+/** @odoo-module **/
+
+import { Component, useState, onWillStart } from "@odoo/owl";
+import { useService } from "@web/core/utils/hooks";
+import { PartnerCard } from "../../components/partner_card/partner_card";
+import { AgingBucketStrip } from "../../components/aging_bucket_strip/aging_bucket_strip";
+import { RiskBadge } from "../../components/risk_badge/risk_badge";
+import { AiTextPanel } from "../../components/ai_text_panel/ai_text_panel";
+import { FollowupHistoryTable } from "../../components/followup_history_table/followup_history_table";
+
+export class FollowupDashboard extends Component {
+    static template = "fusion_accounting_followup.FollowupDashboard";
+    static props = { "*": true };
+    static components = { PartnerCard, AgingBucketStrip, RiskBadge, AiTextPanel, FollowupHistoryTable };
+
+    setup() {
+        this.followup = useService("fusion_followup");
+        this.state = useState(this.followup.state);
+
+        const companyId = this.env.services.user?.context?.allowed_company_ids?.[0];
+
+        onWillStart(async () => {
+            await this.followup.loadOverdue(companyId);
+        });
+    }
+
+    onSelectPartner(partnerId) {
+        this.followup.selectPartner(partnerId);
+    }
+
+    onStatusFilter(status) {
+        this.followup.setStatusFilter(status || null);
+    }
+
+    async onGenerateText() {
+        if (!this.state.selectedPartnerId) return;
+        await this.followup.generateText(this.state.selectedPartnerId);
+    }
+
+    async onSend() {
+        if (!this.state.selectedPartnerId) return;
+        await this.followup.sendFollowup(this.state.selectedPartnerId, null, true);
+    }
+
+    async onPause() {
+        if (!this.state.selectedPartnerId) return;
+        const days = parseInt(prompt("Pause for how many days?", "30"));
+        if (isNaN(days)) return;
+        const until = new Date();
+        until.setDate(until.getDate() + days);
+        await this.followup.pausePartner(
+            this.state.selectedPartnerId, until.toISOString().slice(0, 10));
+    }
+
+    async onReset() {
+        if (!this.state.selectedPartnerId) return;
+        await this.followup.resetPartner(this.state.selectedPartnerId);
+    }
+
+    formatCurrency(amount) {
+        return new Intl.NumberFormat(undefined, {
+            minimumFractionDigits: 2, maximumFractionDigits: 2,
+        }).format(amount || 0);
+    }
+
+    get totalOverdue() {
+        return this.state.partners.reduce((sum, p) => sum + (p.overdue_amount || 0), 0);
+    }
+}

fusion_accounting_followup/static/src/views/followup_dashboard/followup_dashboard.xml

@@ -0,0 +1,65 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<templates xml:space="preserve">
+
+<t t-name="fusion_accounting_followup.FollowupDashboard">
+    <div class="o_fusion_followup">
+        <div class="o_fusion_followup_header">
+            <div>
+                <h1>Customer Follow-ups</h1>
+                <div class="text-muted"><t t-esc="state.count"/> of <t t-esc="state.total"/> partners with overdue</div>
+            </div>
+            <div class="summary">
+                <div>Total overdue: <span class="summary-value">$<t t-esc="formatCurrency(totalOverdue)"/></span></div>
+            </div>
+        </div>
+
+        <div class="d-flex" style="gap: 0.5rem; padding: 0.75rem;">
+            <button class="btn_fu" t-on-click="() => this.onStatusFilter(null)"
+                    t-att-class="state.statusFilter === null ? 'primary' : ''">All</button>
+            <button class="btn_fu" t-on-click="() => this.onStatusFilter('action_due')"
+                    t-att-class="state.statusFilter === 'action_due' ? 'primary' : ''">Action Due</button>
+            <button class="btn_fu" t-on-click="() => this.onStatusFilter('paused')"
+                    t-att-class="state.statusFilter === 'paused' ? 'primary' : ''">Paused</button>
+            <button class="btn_fu" t-on-click="() => this.onStatusFilter('blocked')"
+                    t-att-class="state.statusFilter === 'blocked' ? 'primary' : ''">Blocked</button>
+        </div>
+
+        <div class="d-flex" style="gap: 1rem; padding: 1rem;">
+            <div style="flex: 1 1 50%;">
+                <div t-if="state.isLoading" class="text-center p-4 text-muted">Loading...</div>
+                <div t-elif="state.partners.length === 0" class="text-center p-4 text-muted">No overdue partners.</div>
+                <div t-else="">
+                    <PartnerCard t-foreach="state.partners" t-as="partner" t-key="partner.partner_id"
+                                  partner="partner" selected="state.selectedPartnerId === partner.partner_id"
+                                  onSelect="() => this.onSelectPartner(partner.partner_id)"
+                                  formatCurrency="formatCurrency.bind(this)"/>
+                </div>
+            </div>
+            <div style="flex: 1 1 50%;">
+                <div t-if="state.selectedDetail">
+                    <h3><t t-esc="state.selectedDetail.partner.name"/></h3>
+                    <div class="text-muted">
+                        <t t-if="state.selectedDetail.partner.email"><t t-esc="state.selectedDetail.partner.email"/></t>
+                    </div>
+                    <div class="mt-2">
+                        <RiskBadge band="state.selectedDetail.partner.risk_band"
+                                    score="state.selectedDetail.partner.risk_score"/>
+                    </div>
+                    <AgingBucketStrip aging="state.selectedDetail.overdue.aging"/>
+                    <div class="d-flex mt-3" style="gap: 0.5rem; flex-wrap: wrap;">
+                        <button class="btn_fu" t-on-click="onGenerateText">Generate Text</button>
+                        <button class="btn_fu primary" t-on-click="onSend">Send Now</button>
+                        <button class="btn_fu" t-on-click="onPause">Pause</button>
+                        <button class="btn_fu" t-on-click="onReset">Reset</button>
+                    </div>
+                    <AiTextPanel t-if="state.generatedText" text="state.generatedText"/>
+                    <FollowupHistoryTable t-if="state.selectedDetail.history"
+                                           history="state.selectedDetail.history"/>
+                </div>
+                <div t-else="" class="p-4 text-muted">Select a partner.</div>
+            </div>
+        </div>
+    </div>
+</t>
+
+</templates>

fusion_accounting_followup/static/src/views/followup_dashboard/followup_dashboard_view.js

@@ -0,0 +1,14 @@
+/** @odoo-module **/
+
+import { registry } from "@web/core/registry";
+import { FollowupDashboard } from "./followup_dashboard";
+
+export const fusionFollowupDashboardView = {
+    type: "fusion_followup",
+    Controller: FollowupDashboard,
+    display_name: "Fusion Customer Follow-ups",
+    icon: "fa-bell",
+    multiRecord: true,
+};
+
+registry.category("views").add("fusion_followup", fusionFollowupDashboardView);

fusion_accounting_followup/tests/__init__.py

@@ -0,0 +1,22 @@
+from . import test_overdue_aging
+from . import test_level_resolver
+from . import test_risk_scorer
+from . import test_tone_selector
+from . import test_followup_text_generator
+from . import test_fusion_followup_level
+from . import test_fusion_followup_run
+from . import test_fusion_followup_text_cache
+from . import test_res_partner_inherit
+from . import test_account_move_line_inherit
+from . import test_fusion_followup_engine
+from . import test_engine_integration
+from . import test_followup_controller
+from . import test_followup_adapter
+from . import test_followup_tools
+from . import test_followup_cron
+from . import test_engine_property
+from . import test_followup_full_flow
+from . import test_performance_benchmarks
+from . import test_batch_followup_wizard
+from . import test_migration_round_trip
+from . import test_coexistence

fusion_accounting_followup/tests/test_account_move_line_inherit.py

@@ -0,0 +1,34 @@
+from odoo import fields as odoo_fields
+from odoo.tests.common import TransactionCase
+from odoo.tests import tagged
+
+
+@tagged('post_install', '-at_install')
+class TestAccountMoveLineFollowup(TransactionCase):
+    """Verify follow-up tracking fields are added to account.move.line."""
+
+    def test_fields_exist_on_model(self):
+        """Both new fields are declared on account.move.line."""
+        AML = self.env['account.move.line']
+        self.assertIn('fusion_followup_level_id', AML._fields)
+        self.assertIn('fusion_followup_last_run_date', AML._fields)
+        self.assertEqual(
+            AML._fields['fusion_followup_level_id'].comodel_name,
+            'fusion.followup.level',
+        )
+
+    def test_assign_level_and_date_on_existing_line(self):
+        """We can write the new fields onto an existing move line."""
+        line = self.env['account.move.line'].search([], limit=1)
+        if not line:
+            self.skipTest("No account.move.line records present in DB to test against.")
+        level = self.env['fusion.followup.level'].create({
+            'name': 'Reminder', 'sequence': 601, 'delay_days': 7, 'tone': 'gentle',
+        })
+        when = odoo_fields.Datetime.now()
+        line.write({
+            'fusion_followup_level_id': level.id,
+            'fusion_followup_last_run_date': when,
+        })
+        self.assertEqual(line.fusion_followup_level_id, level)
+        self.assertEqual(line.fusion_followup_last_run_date, when)

fusion_accounting_followup/tests/test_batch_followup_wizard.py

@@ -0,0 +1,37 @@
+from odoo.tests.common import TransactionCase
+from odoo.tests import tagged
+from odoo.exceptions import UserError
+
+
+@tagged('post_install', '-at_install')
+class TestBatchFollowupWizard(TransactionCase):
+
+    def test_default_loads_active_ids(self):
+        partners = self.env['res.partner'].create([
+            {'name': 'B1'}, {'name': 'B2'},
+        ])
+        wizard = self.env['fusion.batch.followup.wizard'].with_context(
+            active_model='res.partner', active_ids=partners.ids,
+        ).create({})
+        self.assertEqual(set(wizard.partner_ids.ids), set(partners.ids))
+
+    def test_selected_scope_no_partners_raises(self):
+        wizard = self.env['fusion.batch.followup.wizard'].create({
+            'scope': 'selected', 'partner_ids': [(6, 0, [])],
+        })
+        with self.assertRaises(UserError):
+            wizard.action_run()
+
+    def test_run_completes_with_no_overdue_partners(self):
+        partners = self.env['res.partner'].create([
+            {'name': 'NoOverdue1'}, {'name': 'NoOverdue2'},
+        ])
+        wizard = self.env['fusion.batch.followup.wizard'].create({
+            'scope': 'selected',
+            'partner_ids': [(6, 0, partners.ids)],
+            'force': True,
+        })
+        wizard.action_run()
+        self.assertEqual(wizard.state, 'done')
+        # 2 partners with no overdue → both skipped
+        self.assertEqual(wizard.skipped_count, 2)

fusion_accounting_followup/tests/test_coexistence.py

@@ -0,0 +1,37 @@
+"""Coexistence tests: fusion_accounting_followup menu only visible when
+Enterprise account_followup is NOT installed."""
+
+from odoo.tests.common import TransactionCase
+from odoo.tests import tagged
+
+
+@tagged('post_install', '-at_install')
+class TestFollowupCoexistence(TransactionCase):
+
+    def setUp(self):
+        super().setUp()
+        self.coex_group = self.env.ref(
+            'fusion_accounting_core.group_fusion_show_when_enterprise_absent',
+            raise_if_not_found=False,
+        )
+        self.assertIsNotNone(self.coex_group, "Coexistence group must exist")
+
+    def test_engine_always_available(self):
+        self.assertIn('fusion.followup.engine', self.env.registry)
+
+    def test_menu_gated_by_coexistence_group(self):
+        menu = self.env.ref('fusion_accounting_followup.menu_fusion_followup_root',
+                             raise_if_not_found=False)
+        if not menu:
+            self.skipTest("Menu not loaded")
+        menu_groups = getattr(menu, 'group_ids', None) or menu.groups_id
+        self.assertIn(self.coex_group, menu_groups,
+            "Followup root menu must require the coexistence group")
+
+    def test_levels_menu_gated(self):
+        menu = self.env.ref('fusion_accounting_followup.menu_fusion_followup_levels',
+                             raise_if_not_found=False)
+        if not menu:
+            self.skipTest("Menu not loaded")
+        menu_groups = getattr(menu, 'group_ids', None) or menu.groups_id
+        self.assertIn(self.coex_group, menu_groups)

fusion_accounting_followup/tests/test_engine_integration.py

@@ -0,0 +1,76 @@
+"""Integration tests: full follow-up flow with real overdue invoices."""
+
+from datetime import date, timedelta
+from odoo.tests.common import TransactionCase
+from odoo.tests import tagged
+
+
+@tagged('post_install', '-at_install', 'integration')
+class TestFollowupEngineIntegration(TransactionCase):
+
+    def setUp(self):
+        super().setUp()
+        self.engine = self.env['fusion.followup.engine']
+        self.partner = self.env['res.partner'].create({
+            'name': 'Integration Partner', 'email': 'integ@test.local',
+        })
+        for seq, name, days, tone in [(801, 'Test Reminder', 7, 'gentle'),
+                                      (802, 'Test Warning', 30, 'firm'),
+                                      (803, 'Test Legal', 60, 'legal')]:
+            self.env['fusion.followup.level'].create({
+                'name': name, 'sequence': seq, 'delay_days': days, 'tone': tone,
+            })
+
+        line = self.env['account.move.line'].search([
+            ('parent_state', '=', 'posted'),
+            ('account_id.account_type', '=', 'asset_receivable'),
+            ('reconciled', '=', False),
+            ('amount_residual', '>', 0),
+        ], limit=1)
+        if not line:
+            self.skipTest("No posted unreconciled receivable lines in test DB")
+        line.write({
+            'partner_id': self.partner.id,
+            'date_maturity': date.today() - timedelta(days=20),
+        })
+
+    def test_get_overdue_finds_lines(self):
+        result = self.engine.get_overdue_for_partner(self.partner)
+        self.assertGreater(result['overdue_line_count'], 0)
+        self.assertGreater(result['aging']['total_overdue_amount'], 0)
+
+    def test_compute_level_picks_reminder_at_20_days(self):
+        level = self.engine.compute_followup_level(self.partner)
+        self.assertTrue(level)
+        self.assertGreater(level.delay_days, 0)
+
+    def test_send_followup_creates_run(self):
+        result = self.engine.send_followup_email(self.partner, force=True)
+        self.assertIn(result['status'], ('sent', 'manual_review'))
+        if 'run_id' in result:
+            run = self.env['fusion.followup.run'].browse(result['run_id'])
+            self.assertEqual(run.partner_id, self.partner)
+
+    def test_pause_blocks_send_unless_force(self):
+        self.engine.pause_followup(self.partner,
+                                   until_date=date.today() + timedelta(days=30))
+        result = self.engine.send_followup_email(self.partner)
+        self.assertTrue(result['status'].startswith('paused'))
+        result_force = self.engine.send_followup_email(self.partner, force=True)
+        self.assertIn(result_force['status'], ('sent', 'manual_review'))
+
+    def test_history_grows_with_each_send(self):
+        Run = self.env['fusion.followup.run']
+        before = Run.search_count([('partner_id', '=', self.partner.id)])
+        self.engine.send_followup_email(self.partner, force=True)
+        after = Run.search_count([('partner_id', '=', self.partner.id)])
+        self.assertGreater(after, before)
+
+    def test_text_cache_used_on_repeat_call(self):
+        Cache = self.env['fusion.followup.text.cache']
+        self.engine.send_followup_email(self.partner, force=True)
+        cache_count_after_first = Cache.search_count([('partner_id', '=', self.partner.id)])
+        self.engine.send_followup_email(self.partner, force=True)
+        cache_count_after_second = Cache.search_count([('partner_id', '=', self.partner.id)])
+        self.assertEqual(cache_count_after_first, cache_count_after_second,
+            "Repeat send with same params should not create new cache row")

fusion_accounting_followup/tests/test_engine_property.py

@@ -0,0 +1,92 @@
+"""Property-based invariants for follow-up services."""
+
+from datetime import date, timedelta
+
+from hypothesis import given, settings, strategies as st, HealthCheck
+from odoo.tests.common import TransactionCase
+from odoo.tests import tagged
+
+from odoo.addons.fusion_accounting_followup.services.overdue_aging import (
+    compute_aging, BUCKETS,
+)
+from odoo.addons.fusion_accounting_followup.services.risk_scorer import score_partner
+from odoo.addons.fusion_accounting_followup.services.tone_selector import select_tone
+
+
+@tagged('post_install', '-at_install', 'property_based')
+class TestAgingInvariants(TransactionCase):
+
+    @given(
+        as_of=st.dates(min_value=date(2020, 1, 1), max_value=date(2030, 12, 31)),
+        amounts=st.lists(
+            st.tuples(
+                st.integers(min_value=-180, max_value=180),
+                st.floats(min_value=0.01, max_value=100000,
+                          allow_nan=False, allow_infinity=False),
+            ),
+            min_size=0, max_size=20,
+        ),
+    )
+    @settings(max_examples=80, deadline=2000,
+              suppress_health_check=[HealthCheck.function_scoped_fixture])
+    def test_buckets_sum_equals_total(self, as_of, amounts):
+        lines = [
+            {'date_maturity': as_of + timedelta(days=offset),
+             'amount_residual': round(amt, 2)}
+            for offset, amt in amounts
+        ]
+        report = compute_aging(move_lines=lines, as_of=as_of)
+        bucket_sum = sum(b.amount for b in report.buckets)
+        self.assertAlmostEqual(bucket_sum, report.total_amount, places=1)
+
+    @given(
+        as_of=st.dates(min_value=date(2020, 1, 1), max_value=date(2030, 12, 31)),
+        days_overdue=st.integers(min_value=1, max_value=365),
+        amount=st.floats(min_value=0.01, max_value=10000,
+                         allow_nan=False, allow_infinity=False),
+    )
+    @settings(max_examples=50, deadline=2000,
+              suppress_health_check=[HealthCheck.function_scoped_fixture])
+    def test_overdue_amount_excludes_current(self, as_of, days_overdue, amount):
+        lines = [
+            {'date_maturity': as_of - timedelta(days=days_overdue),
+             'amount_residual': round(amount, 2)},
+            {'date_maturity': as_of + timedelta(days=10),
+             'amount_residual': 100.0},
+        ]
+        report = compute_aging(move_lines=lines, as_of=as_of)
+        self.assertAlmostEqual(report.total_overdue_amount, round(amount, 2), places=1)
+
+    @given(
+        invoices=st.integers(min_value=0, max_value=100),
+        late=st.integers(min_value=0, max_value=100),
+        days_late=st.floats(min_value=0, max_value=180,
+                            allow_nan=False, allow_infinity=False),
+    )
+    @settings(max_examples=80, deadline=2000,
+              suppress_health_check=[HealthCheck.function_scoped_fixture])
+    def test_risk_score_in_range(self, invoices, late, days_late):
+        late = min(late, invoices) if invoices > 0 else 0
+        result = score_partner(
+            total_invoices=invoices, paid_late_count=late,
+            avg_days_late=days_late,
+            longest_overdue_days=int(days_late),
+            open_overdue_amount=invoices * 1000.0,
+            average_invoice_amount=1000.0,
+        )
+        self.assertGreaterEqual(result.score, 0)
+        self.assertLessEqual(result.score, 100)
+
+
+@tagged('post_install', '-at_install', 'property_based')
+class TestToneInvariants(TransactionCase):
+
+    @given(
+        sequence=st.integers(min_value=1, max_value=10),
+        risk=st.integers(min_value=0, max_value=100),
+    )
+    @settings(max_examples=50, deadline=1000,
+              suppress_health_check=[HealthCheck.function_scoped_fixture])
+    def test_tone_always_in_valid_set(self, sequence, risk):
+        tone = select_tone(level_sequence=sequence, risk_score=risk)
+        self.assertIn(tone, ('gentle', 'firm', 'legal'))

fusion_accounting_followup/tests/test_followup_adapter.py

@@ -0,0 +1,42 @@
+"""FollowupAdapter wiring tests — engine paths."""
+
+from odoo.tests import tagged
+from odoo.tests.common import TransactionCase
+
+from odoo.addons.fusion_accounting_ai.services.data_adapters.followup import (
+    FollowupAdapter,
+)
+
+
+@tagged('post_install', '-at_install')
+class TestFollowupAdapter(TransactionCase):
+
+    def setUp(self):
+        super().setUp()
+        self.adapter = FollowupAdapter(self.env)
+
+    def test_list_overdue_via_fusion_returns_dict(self):
+        result = self.adapter.list_overdue_via_fusion(
+            company_id=self.env.company.id,
+        )
+        self.assertIn('partners', result)
+        self.assertIn('total', result)
+        self.assertIn('count', result)
+
+    def test_list_overdue_via_community_returns_error(self):
+        result = self.adapter.list_overdue_via_community()
+        self.assertIn('error', result)
+
+    def test_send_followup_via_fusion_no_overdue(self):
+        partner = self.env['res.partner'].create({'name': 'AdapterTest'})
+        result = self.adapter.send_followup_via_fusion(
+            partner_id=partner.id, force=True,
+        )
+        self.assertIn(
+            result.get('status', ''),
+            ('no_action', 'no_overdue', 'sent', 'manual_review'),
+        )
+
+    def test_send_followup_via_community_returns_error(self):
+        result = self.adapter.send_followup_via_community(partner_id=1)
+        self.assertIn('error', result)

fusion_accounting_followup/tests/test_followup_controller.py

@@ -0,0 +1,80 @@
+"""HttpCase tests for the 6 follow-up JSON-RPC endpoints."""
+
+import json
+from datetime import date, timedelta
+
+from odoo.tests import tagged
+from odoo.tests.common import HttpCase, new_test_user
+
+
+@tagged('post_install', '-at_install')
+class TestFollowupController(HttpCase):
+
+    def setUp(self):
+        super().setUp()
+        self.user = new_test_user(
+            self.env, login='fu_test_user',
+            groups='base.group_user,base.group_partner_manager,'
+                   'account.group_account_invoice',
+        )
+
+    def _jsonrpc(self, endpoint, params):
+        self.authenticate('fu_test_user', 'fu_test_user')
+        url = f'/fusion/followup/{endpoint}'
+        body = {'jsonrpc': '2.0', 'method': 'call', 'params': params, 'id': 1}
+        response = self.url_open(
+            url, data=json.dumps(body),
+            headers={'Content-Type': 'application/json'},
+        )
+        self.assertEqual(
+            response.status_code, 200,
+            f"{endpoint} returned {response.status_code}: {response.text[:300]}",
+        )
+        result = response.json()
+        if 'error' in result:
+            self.fail(f"{endpoint} errored: {result['error']}")
+        return result.get('result', {})
+
+    def test_list_overdue_returns_dict(self):
+        result = self._jsonrpc('list_overdue', {'company_id': self.env.company.id})
+        self.assertIn('partners', result)
+        self.assertIn('total', result)
+
+    def test_get_partner_detail(self):
+        partner = self.env['res.partner'].create({
+            'name': 'Ctrl Test Partner', 'email': 'ctrl@test.local',
+        })
+        result = self._jsonrpc('get_partner_detail', {'partner_id': partner.id})
+        self.assertEqual(result['partner']['id'], partner.id)
+        self.assertIn('overdue', result)
+        self.assertIn('history', result)
+
+    def test_pause_sets_paused_until(self):
+        partner = self.env['res.partner'].create({'name': 'Pause Test'})
+        future = (date.today() + timedelta(days=20)).isoformat()
+        result = self._jsonrpc('pause', {
+            'partner_id': partner.id, 'until_date': future,
+        })
+        self.assertEqual(result['paused_until'], future)
+
+    def test_reset_clears_status(self):
+        partner = self.env['res.partner'].create({
+            'name': 'Reset Test',
+            'fusion_followup_status': 'paused',
+        })
+        result = self._jsonrpc('reset', {'partner_id': partner.id})
+        self.assertEqual(result['status'], 'reset')
+
+    def test_send_no_overdue_returns_no_action(self):
+        partner = self.env['res.partner'].create({
+            'name': 'No Overdue', 'email': 'no@test.local',
+        })
+        result = self._jsonrpc('send', {
+            'partner_id': partner.id, 'force': True,
+        })
+        self.assertIn(result.get('status'), ('no_action', 'no_overdue'))
+
+    def test_generate_text_no_level_returns_no_level(self):
+        partner = self.env['res.partner'].create({'name': 'NoLevel Test'})
+        result = self._jsonrpc('generate_text', {'partner_id': partner.id})
+        self.assertIn(result.get('status'), ('no_level', 'ok'))

fusion_accounting_followup/tests/test_followup_cron.py

@@ -0,0 +1,18 @@
+"""Smoke tests for the fusion follow-up cron handlers."""
+
+from odoo.tests import tagged
+from odoo.tests.common import TransactionCase
+
+
+@tagged('post_install', '-at_install')
+class TestFollowupCron(TransactionCase):
+
+    def setUp(self):
+        super().setUp()
+        self.cron = self.env['fusion.followup.cron']
+
+    def test_cron_daily_scan_runs(self):
+        self.cron._cron_daily_scan()
+
+    def test_cron_risk_refresh_runs(self):
+        self.cron._cron_risk_refresh()

fusion_accounting_followup/tests/test_followup_full_flow.py

@@ -0,0 +1,84 @@
+"""End-to-end integration: scan -> escalate -> send -> reset."""
+
+from datetime import date, timedelta
+from odoo.tests.common import TransactionCase
+from odoo.tests import tagged
+
+
+@tagged('post_install', '-at_install', 'integration')
+class TestFollowupFullFlow(TransactionCase):
+
+    def setUp(self):
+        super().setUp()
+        self.engine = self.env['fusion.followup.engine']
+        self.partner = self.env['res.partner'].create({
+            'name': 'Full Flow Partner', 'email': 'flow@test.local',
+        })
+        for seq, name, days, tone in [(701, 'FlowReminder', 7, 'gentle'),
+                                      (702, 'FlowWarning', 30, 'firm'),
+                                      (703, 'FlowLegal', 60, 'legal')]:
+            self.env['fusion.followup.level'].create({
+                'name': name, 'sequence': seq,
+                'delay_days': days, 'tone': tone,
+            })
+
+        line = self.env['account.move.line'].search([
+            ('parent_state', '=', 'posted'),
+            ('account_id.account_type', '=', 'asset_receivable'),
+            ('reconciled', '=', False),
+            ('amount_residual', '>', 0),
+        ], limit=1)
+        if not line:
+            self.skipTest("No posted unreconciled receivable lines in test DB")
+        line.write({
+            'partner_id': self.partner.id,
+            'date_maturity': date.today() - timedelta(days=20),
+        })
+
+    def test_full_flow_scan_send_reset(self):
+        level = self.engine.compute_followup_level(self.partner)
+        self.assertTrue(level)
+        self.assertGreater(level.delay_days, 0)
+
+        Run = self.env['fusion.followup.run']
+        before = Run.search_count([('partner_id', '=', self.partner.id)])
+        result = self.engine.send_followup_email(self.partner, force=True)
+        after = Run.search_count([('partner_id', '=', self.partner.id)])
+        self.assertGreater(after, before)
+        self.assertIn(result['status'], ('sent', 'manual_review'))
+
+        self.engine.pause_followup(self.partner,
+                                   until_date=date.today() + timedelta(days=14))
+        result_paused = self.engine.send_followup_email(self.partner)
+        self.assertTrue(result_paused['status'].startswith('paused'))
+
+        self.engine.reset_followup(self.partner)
+        self.partner.invalidate_recordset(['fusion_followup_status'])
+        self.assertEqual(self.partner.fusion_followup_status, 'no_action')
+
+    def test_escalate_advances_to_next_level(self):
+        Level = self.env['fusion.followup.level']
+        level1 = Level.search([('sequence', '=', 701)], limit=1)
+        self.engine.send_followup_email(self.partner, level=level1, force=True)
+        self.partner.invalidate_recordset(['fusion_followup_last_level_id'])
+        result = self.engine.escalate_to_next_level(self.partner)
+        self.assertIn('partner_id', result)
+        self.partner.invalidate_recordset(['fusion_followup_last_level_id'])
+        if self.partner.fusion_followup_last_level_id:
+            self.assertGreaterEqual(self.partner.fusion_followup_last_level_id.sequence, 702)
+
+    def test_text_cache_reused_on_repeat(self):
+        Cache = self.env['fusion.followup.text.cache']
+        self.engine.send_followup_email(self.partner, force=True)
+        after_first = Cache.search_count([('partner_id', '=', self.partner.id)])
+        self.engine.send_followup_email(self.partner, force=True)
+        after_second = Cache.search_count([('partner_id', '=', self.partner.id)])
+        self.assertEqual(after_first, after_second)
+
+    def test_history_records_each_send(self):
+        Run = self.env['fusion.followup.run']
+        before = Run.search_count([('partner_id', '=', self.partner.id)])
+        self.engine.send_followup_email(self.partner, force=True)
+        self.engine.send_followup_email(self.partner, force=True)
+        after = Run.search_count([('partner_id', '=', self.partner.id)])
+        self.assertEqual(after - before, 2)

fusion_accounting_followup/tests/test_followup_text_generator.py

@@ -0,0 +1,80 @@
+from odoo.tests.common import TransactionCase
+from odoo.tests import tagged
+from odoo.addons.fusion_accounting_followup.services.followup_text_generator import (
+    generate_followup_text,
+)
+from odoo.addons.fusion_accounting_followup.services.followup_text_prompt import (
+    SYSTEM_PROMPT, build_prompt,
+)
+
+
+@tagged('post_install', '-at_install')
+class TestFollowupTextGenerator(TransactionCase):
+
+    def setUp(self):
+        super().setUp()
+        self.env['ir.config_parameter'].sudo().search([
+            ('key', 'in', ['fusion_accounting.provider.followup_text',
+                           'fusion_accounting.provider.default'])
+        ]).unlink()
+
+    def test_fallback_gentle(self):
+        result = generate_followup_text(
+            self.env, partner_name='Acme Corp', total_overdue=1500,
+            currency_code='USD', longest_overdue_days=15, tone='gentle',
+            invoice_count=2,
+        )
+        self.assertEqual(result['tone_used'], 'gentle')
+        self.assertIn('Acme Corp', result['body'])
+        self.assertIn('1,500.00', result['body'])
+
+    def test_fallback_firm(self):
+        result = generate_followup_text(
+            self.env, partner_name='Acme', total_overdue=5000,
+            currency_code='USD', longest_overdue_days=45, tone='firm',
+            invoice_count=3,
+        )
+        self.assertEqual(result['tone_used'], 'firm')
+
+    def test_fallback_legal(self):
+        result = generate_followup_text(
+            self.env, partner_name='Acme', total_overdue=10000,
+            currency_code='USD', longest_overdue_days=90, tone='legal',
+            invoice_count=5,
+        )
+        self.assertEqual(result['tone_used'], 'legal')
+        self.assertIn('FINAL NOTICE', result['subject'])
+
+    def test_returns_required_keys(self):
+        result = generate_followup_text(
+            self.env, partner_name='X', total_overdue=100,
+            currency_code='USD', longest_overdue_days=10, tone='gentle',
+        )
+        for key in ('subject', 'body', 'tone_used', 'key_points'):
+            self.assertIn(key, result)
+
+
+@tagged('post_install', '-at_install')
+class TestFollowupTextPrompt(TransactionCase):
+
+    def test_system_prompt_requires_json(self):
+        self.assertIn('JSON', SYSTEM_PROMPT)
+        self.assertIn('"subject"', SYSTEM_PROMPT)
+        self.assertIn('"body"', SYSTEM_PROMPT)
+
+    def test_build_prompt_returns_tuple(self):
+        result = build_prompt(
+            partner_name='X', total_overdue=100, currency_code='USD',
+            longest_overdue_days=10, tone='gentle',
+        )
+        self.assertEqual(len(result), 2)
+        self.assertIn('100.00', result[1])
+
+    def test_build_prompt_includes_risk_drivers(self):
+        _, user = build_prompt(
+            partner_name='X', total_overdue=100, currency_code='USD',
+            longest_overdue_days=10, tone='firm',
+            risk_drivers=['Chronic late payer', '5/10 paid late'],
+        )
+        self.assertIn('RISK FACTORS', user)
+        self.assertIn('Chronic late payer', user)

fusion_accounting_followup/tests/test_followup_tools.py

@@ -0,0 +1,61 @@
+"""AI tool dispatch tests for fusion follow-up tools."""
+
+from odoo.tests import tagged
+from odoo.tests.common import TransactionCase
+
+from odoo.addons.fusion_accounting_ai.services.tools import customer_followup as tools
+
+
+@tagged('post_install', '-at_install')
+class TestFusionFollowupTools(TransactionCase):
+
+    def test_fusion_list_overdue(self):
+        result = tools.fusion_list_overdue(
+            self.env, {'company_id': self.env.company.id},
+        )
+        self.assertIn('partners', result)
+
+    def test_fusion_get_partner_detail(self):
+        partner = self.env['res.partner'].create({
+            'name': 'Tool Partner', 'email': 't@t.local',
+        })
+        result = tools.fusion_get_partner_followup_detail(
+            self.env, {'partner_id': partner.id},
+        )
+        self.assertEqual(result['partner_id'], partner.id)
+
+    def test_fusion_generate_text_uses_fallback(self):
+        self.env['ir.config_parameter'].sudo().search([
+            ('key', 'in', [
+                'fusion_accounting.provider.followup_text',
+                'fusion_accounting.provider.default',
+            ]),
+        ]).unlink()
+        result = tools.fusion_generate_followup_text(self.env, {
+            'partner_name': 'Acme', 'total_overdue': 1000,
+            'currency_code': 'USD', 'longest_overdue_days': 15,
+            'tone': 'gentle',
+        })
+        self.assertIn('subject', result)
+        self.assertIn('body', result)
+
+    def test_fusion_get_risk_score(self):
+        partner = self.env['res.partner'].create({'name': 'Risk Test'})
+        result = tools.fusion_get_partner_risk_score(
+            self.env, {'partner_id': partner.id},
+        )
+        self.assertIn('risk', result)
+
+    def test_tools_registered_in_dispatch(self):
+        from odoo.addons.fusion_accounting_ai.services.tools import TOOL_DISPATCH
+        for tool_name in [
+            'fusion_list_overdue',
+            'fusion_get_partner_followup_detail',
+            'fusion_generate_followup_text',
+            'fusion_send_followup',
+            'fusion_get_partner_risk_score',
+        ]:
+            self.assertIn(
+                tool_name, TOOL_DISPATCH,
+                f"{tool_name} not registered in TOOL_DISPATCH",
+            )

fusion_accounting_followup/tests/test_fusion_followup_engine.py

@@ -0,0 +1,74 @@
+"""Unit tests for the fusion.followup.engine 7-method API."""
+
+from datetime import date, timedelta
+from odoo.tests.common import TransactionCase
+from odoo.tests import tagged
+
+
+@tagged('post_install', '-at_install')
+class TestFusionFollowupEngine(TransactionCase):
+
+    def setUp(self):
+        super().setUp()
+        self.engine = self.env['fusion.followup.engine']
+        self.partner = self.env['res.partner'].create({
+            'name': 'Engine Test Partner', 'email': 'engine@test.local',
+        })
+        for seq, name, days, tone in [(901, 'Reminder', 7, 'gentle'),
+                                      (902, 'Warning', 30, 'firm'),
+                                      (903, 'Legal', 60, 'legal')]:
+            self.env['fusion.followup.level'].create({
+                'name': name, 'sequence': seq,
+                'delay_days': days, 'tone': tone,
+            })
+
+    def test_engine_model_exists(self):
+        self.assertIn('fusion.followup.engine', self.env.registry)
+
+    def test_get_overdue_returns_dict(self):
+        result = self.engine.get_overdue_for_partner(self.partner)
+        self.assertIn('aging', result)
+        self.assertIn('risk', result)
+        self.assertEqual(result['partner_id'], self.partner.id)
+
+    def test_compute_followup_level_no_overdue_returns_empty(self):
+        result = self.engine.compute_followup_level(self.partner)
+        self.assertFalse(result)
+
+    def test_pause_sets_partner_state(self):
+        until = date.today() + timedelta(days=14)
+        self.engine.pause_followup(self.partner, until_date=until)
+        self.partner.invalidate_recordset(['fusion_followup_paused_until', 'fusion_followup_status'])
+        self.assertEqual(self.partner.fusion_followup_paused_until, until)
+        self.assertEqual(self.partner.fusion_followup_status, 'paused')
+
+    def test_reset_clears_state(self):
+        self.engine.pause_followup(self.partner)
+        self.engine.reset_followup(self.partner)
+        self.partner.invalidate_recordset([
+            'fusion_followup_status', 'fusion_followup_paused_until',
+            'fusion_followup_last_level_id',
+        ])
+        self.assertEqual(self.partner.fusion_followup_status, 'no_action')
+        self.assertFalse(self.partner.fusion_followup_paused_until)
+
+    def test_snapshot_history_returns_runs(self):
+        Run = self.env['fusion.followup.run']
+        run = Run.create({
+            'partner_id': self.partner.id,
+            'state': 'sent',
+            'overdue_amount': 500,
+        })
+        result = self.engine.snapshot_followup_history(self.partner)
+        self.assertEqual(result['count'], 1)
+        self.assertEqual(result['runs'][0]['id'], run.id)
+
+    def test_send_no_overdue_returns_no_action(self):
+        Level = self.env['fusion.followup.level']
+        level = Level.search([('sequence', '=', 901)], limit=1)
+        result = self.engine.send_followup_email(self.partner, level=level, force=True)
+        self.assertEqual(result['status'], 'no_overdue')
+
+    def test_escalate_when_no_current_level(self):
+        result = self.engine.escalate_to_next_level(self.partner)
+        self.assertIn('partner_id', result)

fusion_accounting_followup/tests/test_fusion_followup_level.py

@@ -0,0 +1,43 @@
+from odoo.tests.common import TransactionCase
+from odoo.tests import tagged
+
+
+@tagged('post_install', '-at_install')
+class TestFusionFollowupLevel(TransactionCase):
+
+    def test_create_minimal(self):
+        # Note: sequences 1-3 are reserved for seeded default levels.
+        level = self.env['fusion.followup.level'].create({
+            'name': 'Reminder', 'sequence': 901, 'delay_days': 7, 'tone': 'gentle',
+        })
+        self.assertEqual(level.name, 'Reminder')
+        self.assertTrue(level.active)
+
+    def test_negative_delay_rejected(self):
+        with self.assertRaises(Exception):
+            self.env['fusion.followup.level'].create({
+                'name': 'Bad', 'sequence': 902, 'delay_days': -5, 'tone': 'gentle',
+            })
+
+    def test_duplicate_sequence_rejected(self):
+        self.env['fusion.followup.level'].create({
+            'name': 'A', 'sequence': 100, 'delay_days': 7, 'tone': 'gentle',
+        })
+        with self.assertRaises(Exception):
+            self.env['fusion.followup.level'].create({
+                'name': 'B', 'sequence': 100, 'delay_days': 30, 'tone': 'firm',
+            })
+
+    def test_three_levels_escalate(self):
+        for seq, name, days, tone in [(1, 'R', 7, 'gentle'),
+                                      (2, 'W', 30, 'firm'),
+                                      (3, 'L', 60, 'legal')]:
+            self.env['fusion.followup.level'].create({
+                'name': name, 'sequence': seq + 200,
+                'delay_days': days, 'tone': tone,
+            })
+        levels = self.env['fusion.followup.level'].search([
+            ('sequence', '>', 200),
+        ], order='sequence')
+        self.assertEqual(len(levels), 3)
+        self.assertEqual(levels.mapped('tone'), ['gentle', 'firm', 'legal'])

fusion_accounting_followup/tests/test_fusion_followup_run.py

@@ -0,0 +1,44 @@
+from odoo.tests.common import TransactionCase
+from odoo.tests import tagged
+
+
+@tagged('post_install', '-at_install')
+class TestFusionFollowupRun(TransactionCase):
+
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
+        cls.partner = cls.env['res.partner'].create({'name': 'Run Test Partner'})
+        cls.level = cls.env['fusion.followup.level'].create({
+            'name': 'Reminder', 'sequence': 301, 'delay_days': 7, 'tone': 'gentle',
+        })
+
+    def test_create_minimal(self):
+        run = self.env['fusion.followup.run'].create({
+            'partner_id': self.partner.id,
+            'level_id': self.level.id,
+        })
+        self.assertEqual(run.state, 'draft')
+        self.assertTrue(run.execution_date)
+
+    def test_action_mark_sent(self):
+        run = self.env['fusion.followup.run'].create({
+            'partner_id': self.partner.id,
+            'level_id': self.level.id,
+        })
+        run.action_mark_sent()
+        self.assertEqual(run.state, 'sent')
+
+    def test_action_mark_failed_records_error(self):
+        run = self.env['fusion.followup.run'].create({
+            'partner_id': self.partner.id,
+        })
+        run.action_mark_failed(error='SMTP unreachable')
+        self.assertEqual(run.state, 'failed')
+        self.assertEqual(run.error_message, 'SMTP unreachable')
+
+    def test_partner_required(self):
+        with self.assertRaises(Exception):
+            self.env['fusion.followup.run'].create({
+                'level_id': self.level.id,
+            })

fusion_accounting_followup/tests/test_fusion_followup_text_cache.py

@@ -0,0 +1,60 @@
+from odoo.tests.common import TransactionCase
+from odoo.tests import tagged
+
+
+@tagged('post_install', '-at_install')
+class TestFusionFollowupTextCache(TransactionCase):
+
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
+        cls.partner = cls.env['res.partner'].create({'name': 'Cache Test Partner'})
+        cls.level = cls.env['fusion.followup.level'].create({
+            'name': 'Reminder', 'sequence': 401, 'delay_days': 7, 'tone': 'gentle',
+        })
+        cls.cache = cls.env['fusion.followup.text.cache']
+
+    def _kwargs(self, **overrides):
+        base = dict(
+            partner_id=self.partner.id, level_id=self.level.id,
+            overdue_amount=1234.56, longest_overdue_days=10,
+            invoice_count=3, tone='gentle',
+        )
+        base.update(overrides)
+        return base
+
+    def test_fingerprint_stable_and_unique(self):
+        fp1 = self.cache.compute_fingerprint(**self._kwargs())
+        fp2 = self.cache.compute_fingerprint(**self._kwargs())
+        fp3 = self.cache.compute_fingerprint(**self._kwargs(tone='firm'))
+        self.assertEqual(fp1, fp2)
+        self.assertNotEqual(fp1, fp3)
+        self.assertEqual(len(fp1), 64)
+
+    def test_lookup_returns_empty_when_missing(self):
+        result = self.cache.lookup(**self._kwargs())
+        self.assertFalse(result)
+
+    def test_lookup_finds_cached_entry(self):
+        kwargs = self._kwargs()
+        fp = self.cache.compute_fingerprint(**kwargs)
+        entry = self.cache.create({
+            'partner_id': self.partner.id,
+            'level_id': self.level.id,
+            'fingerprint': fp,
+            'subject': 'Hi',
+            'body': 'Please pay.',
+            'tone_used': 'gentle',
+        })
+        found = self.cache.lookup(**kwargs)
+        self.assertEqual(found.id, entry.id)
+
+    def test_action_increment_use(self):
+        entry = self.cache.create({
+            'partner_id': self.partner.id,
+            'fingerprint': 'abc123',
+        })
+        self.assertEqual(entry.use_count, 0)
+        entry.action_increment_use()
+        entry.action_increment_use()
+        self.assertEqual(entry.use_count, 2)

fusion_accounting_followup/tests/test_level_resolver.py

@@ -0,0 +1,58 @@
+from datetime import date, timedelta
+from odoo.tests.common import TransactionCase
+from odoo.tests import tagged
+from odoo.addons.fusion_accounting_followup.services.level_resolver import (
+    FollowupLevelSpec, resolve_level,
+)
+from odoo.addons.fusion_accounting_followup.services.overdue_aging import compute_aging
+
+
+@tagged('post_install', '-at_install')
+class TestLevelResolver(TransactionCase):
+
+    def setUp(self):
+        super().setUp()
+        self.levels = [
+            FollowupLevelSpec(sequence=1, name='Reminder', delay_days=7, tone='gentle'),
+            FollowupLevelSpec(sequence=2, name='Warning', delay_days=30, tone='firm'),
+            FollowupLevelSpec(sequence=3, name='Legal Notice', delay_days=60, tone='legal'),
+        ]
+
+    def test_no_overdue_returns_none(self):
+        as_of = date(2026, 4, 19)
+        lines = [{'date_maturity': as_of + timedelta(days=10), 'amount_residual': 100}]
+        report = compute_aging(move_lines=lines, as_of=as_of)
+        result = resolve_level(aging_report=report, levels=self.levels)
+        self.assertIsNone(result)
+
+    def test_15_days_overdue_picks_reminder(self):
+        as_of = date(2026, 4, 19)
+        lines = [{'date_maturity': as_of - timedelta(days=15), 'amount_residual': 100}]
+        report = compute_aging(move_lines=lines, as_of=as_of)
+        result = resolve_level(aging_report=report, levels=self.levels)
+        self.assertEqual(result.name, 'Reminder')
+
+    def test_45_days_overdue_picks_warning(self):
+        as_of = date(2026, 4, 19)
+        lines = [{'date_maturity': as_of - timedelta(days=45), 'amount_residual': 200}]
+        report = compute_aging(move_lines=lines, as_of=as_of)
+        result = resolve_level(aging_report=report, levels=self.levels)
+        self.assertEqual(result.name, 'Warning')
+
+    def test_75_days_overdue_picks_legal(self):
+        as_of = date(2026, 4, 19)
+        lines = [{'date_maturity': as_of - timedelta(days=75), 'amount_residual': 300}]
+        report = compute_aging(move_lines=lines, as_of=as_of)
+        result = resolve_level(aging_report=report, levels=self.levels)
+        self.assertEqual(result.name, 'Legal Notice')
+
+    def test_no_levels_returns_none(self):
+        as_of = date(2026, 4, 19)
+        lines = [{'date_maturity': as_of - timedelta(days=30), 'amount_residual': 100}]
+        report = compute_aging(move_lines=lines, as_of=as_of)
+        result = resolve_level(aging_report=report, levels=[])
+        self.assertIsNone(result)
+
+    def test_invalid_tone_raises(self):
+        with self.assertRaises(ValueError):
+            FollowupLevelSpec(sequence=1, name='X', delay_days=7, tone='invalid')

fusion_accounting_followup/tests/test_migration_round_trip.py

@@ -0,0 +1,21 @@
+from odoo.tests.common import TransactionCase
+from odoo.tests import tagged
+
+
+@tagged('post_install', '-at_install')
+class TestFollowupMigrationRoundTrip(TransactionCase):
+
+    def test_bootstrap_step_runs(self):
+        wizard = self.env['fusion.migration.wizard'].create({})
+        result = wizard._followup_bootstrap_step()
+        self.assertEqual(result['step'], 'followup_bootstrap')
+        # Either Enterprise present or not — both OK
+        self.assertIn(result['enterprise_module_present'], [True, False])
+
+    def test_bootstrap_idempotent(self):
+        wizard = self.env['fusion.migration.wizard'].create({})
+        first = wizard._followup_bootstrap_step()
+        second = wizard._followup_bootstrap_step()
+        # Second run skips what first created (or both no-op)
+        if first['enterprise_module_present']:
+            self.assertGreaterEqual(second['skipped'], first['created'])

fusion_accounting_followup/tests/test_overdue_aging.py

@@ -0,0 +1,69 @@
+from datetime import date, timedelta
+from odoo.tests.common import TransactionCase
+from odoo.tests import tagged
+from odoo.addons.fusion_accounting_followup.services.overdue_aging import (
+    compute_aging, BUCKETS,
+)
+
+
+@tagged('post_install', '-at_install')
+class TestOverdueAging(TransactionCase):
+
+    def test_empty_lines_returns_zero_buckets(self):
+        report = compute_aging(move_lines=[], as_of=date(2026, 4, 19))
+        self.assertEqual(report.total_amount, 0)
+        self.assertEqual(len(report.buckets), len(BUCKETS))
+        for b in report.buckets:
+            self.assertEqual(b.amount, 0)
+
+    def test_current_bucket_for_future_maturity(self):
+        as_of = date(2026, 4, 19)
+        lines = [{'date_maturity': date(2026, 5, 19), 'amount_residual': 100}]
+        report = compute_aging(move_lines=lines, as_of=as_of)
+        current = next(b for b in report.buckets if b.name == 'current')
+        self.assertEqual(current.amount, 100)
+        self.assertEqual(report.total_overdue_amount, 0)
+
+    def test_30_day_bucket(self):
+        as_of = date(2026, 4, 19)
+        lines = [{'date_maturity': as_of - timedelta(days=15), 'amount_residual': 200}]
+        report = compute_aging(move_lines=lines, as_of=as_of)
+        b = next(b for b in report.buckets if b.name == '1_30')
+        self.assertEqual(b.amount, 200)
+
+    def test_60_day_bucket(self):
+        as_of = date(2026, 4, 19)
+        lines = [{'date_maturity': as_of - timedelta(days=45), 'amount_residual': 300}]
+        report = compute_aging(move_lines=lines, as_of=as_of)
+        b = next(b for b in report.buckets if b.name == '31_60')
+        self.assertEqual(b.amount, 300)
+
+    def test_120_plus_bucket(self):
+        as_of = date(2026, 4, 19)
+        lines = [{'date_maturity': as_of - timedelta(days=200), 'amount_residual': 500}]
+        report = compute_aging(move_lines=lines, as_of=as_of)
+        b = next(b for b in report.buckets if b.name == '120_plus')
+        self.assertEqual(b.amount, 500)
+
+    def test_total_overdue_excludes_current(self):
+        as_of = date(2026, 4, 19)
+        lines = [
+            {'date_maturity': as_of + timedelta(days=10), 'amount_residual': 100},
+            {'date_maturity': as_of - timedelta(days=10), 'amount_residual': 200},
+            {'date_maturity': as_of - timedelta(days=50), 'amount_residual': 300},
+        ]
+        report = compute_aging(move_lines=lines, as_of=as_of)
+        self.assertEqual(report.total_amount, 600)
+        self.assertEqual(report.total_overdue_amount, 500)
+
+    def test_buckets_sum_equals_total(self):
+        as_of = date(2026, 4, 19)
+        lines = [
+            {'date_maturity': as_of + timedelta(days=10), 'amount_residual': 100},
+            {'date_maturity': as_of - timedelta(days=15), 'amount_residual': 200},
+            {'date_maturity': as_of - timedelta(days=75), 'amount_residual': 300},
+            {'date_maturity': as_of - timedelta(days=200), 'amount_residual': 500},
+        ]
+        report = compute_aging(move_lines=lines, as_of=as_of)
+        bucket_sum = sum(b.amount for b in report.buckets)
+        self.assertAlmostEqual(bucket_sum, report.total_amount, places=2)

fusion_accounting_followup/tests/test_performance_benchmarks.py

@@ -0,0 +1,100 @@
+"""Performance benchmarks tagged 'benchmark'."""
+
+import json
+import statistics
+import time
+from datetime import date, timedelta
+
+from odoo.tests.common import HttpCase, TransactionCase, new_test_user
+from odoo.tests import tagged
+
+
+def _percentile(samples, p):
+    if len(samples) <= 1:
+        return samples[0] if samples else 0
+    sorted_s = sorted(samples)
+    idx = int(len(sorted_s) * p / 100)
+    return sorted_s[min(idx, len(sorted_s) - 1)]
+
+
+@tagged('post_install', '-at_install', 'benchmark')
+class TestEngineBenchmarks(TransactionCase):
+
+    def setUp(self):
+        super().setUp()
+        self.engine = self.env['fusion.followup.engine']
+        for seq, name, days, tone in [(601, 'PerfReminder', 7, 'gentle'),
+                                      (602, 'PerfWarning', 30, 'firm'),
+                                      (603, 'PerfLegal', 60, 'legal')]:
+            self.env['fusion.followup.level'].create({
+                'name': name, 'sequence': seq,
+                'delay_days': days, 'tone': tone,
+            })
+
+    def test_get_overdue_p95(self):
+        partner = self.env['res.partner'].create({'name': 'PerfPartner'})
+        timings = []
+        for _ in range(10):
+            start = time.perf_counter()
+            self.engine.get_overdue_for_partner(partner)
+            timings.append((time.perf_counter() - start) * 1000)
+        p95 = _percentile(timings, 95)
+        median = statistics.median(timings)
+        msg = f"get_overdue_for_partner: median={median:.0f}ms p95={p95:.0f}ms"
+        print(f"\n  PERF: {msg} (target <100ms)")
+        self.assertLess(p95, 1000, f"way over budget: {msg}")
+
+    def test_compute_followup_level_p95(self):
+        partner = self.env['res.partner'].create({'name': 'CompLevelPerf'})
+        timings = []
+        for _ in range(10):
+            start = time.perf_counter()
+            self.engine.compute_followup_level(partner)
+            timings.append((time.perf_counter() - start) * 1000)
+        p95 = _percentile(timings, 95)
+        median = statistics.median(timings)
+        msg = f"compute_followup_level: median={median:.0f}ms p95={p95:.0f}ms"
+        print(f"\n  PERF: {msg} (target <50ms)")
+        self.assertLess(p95, 500)
+
+    def test_send_followup_p95(self):
+        partner = self.env['res.partner'].create({
+            'name': 'SendPerf', 'email': 'sp@test.local',
+        })
+        timings = []
+        for _ in range(5):
+            start = time.perf_counter()
+            self.engine.send_followup_email(partner, force=True)
+            timings.append((time.perf_counter() - start) * 1000)
+        p95 = _percentile(timings, 95)
+        median = statistics.median(timings)
+        msg = f"send_followup_email (no overdue): median={median:.0f}ms p95={p95:.0f}ms"
+        print(f"\n  PERF: {msg} (target <200ms)")
+        self.assertLess(p95, 2000)
+
+
+@tagged('post_install', '-at_install', 'benchmark')
+class TestControllerBenchmarks(HttpCase):
+
+    def test_list_overdue_p95(self):
+        new_test_user(self.env, login='fu_perf',
+                      groups='base.group_user,account.group_account_invoice,base.group_partner_manager')
+        for i in range(20):
+            self.env['res.partner'].create({'name': f'PerfP{i}'})
+        self.authenticate('fu_perf', 'fu_perf')
+        timings = []
+        for _ in range(5):
+            start = time.perf_counter()
+            response = self.url_open(
+                '/fusion/followup/list_overdue',
+                data=json.dumps({'jsonrpc': '2.0', 'method': 'call', 'id': 1,
+                                 'params': {'company_id': self.env.company.id}}),
+                headers={'Content-Type': 'application/json'},
+            )
+            timings.append((time.perf_counter() - start) * 1000)
+            self.assertEqual(response.status_code, 200)
+        p95 = _percentile(timings, 95)
+        median = statistics.median(timings)
+        msg = f"controller.list_overdue: median={median:.0f}ms p95={p95:.0f}ms"
+        print(f"\n  PERF: {msg} (target <500ms)")
+        self.assertLess(p95, 5000)

fusion_accounting_followup/tests/test_res_partner_inherit.py

@@ -0,0 +1,27 @@
+from odoo.tests.common import TransactionCase
+from odoo.tests import tagged
+
+
+@tagged('post_install', '-at_install')
+class TestResPartnerFollowup(TransactionCase):
+
+    def test_default_status_no_action(self):
+        partner = self.env['res.partner'].create({'name': 'Default Status'})
+        self.assertEqual(partner.fusion_followup_status, 'no_action')
+        self.assertEqual(partner.fusion_followup_risk_band, 'low')
+        self.assertEqual(partner.fusion_followup_risk_score, 0)
+
+    def test_run_count_reflects_history(self):
+        partner = self.env['res.partner'].create({'name': 'History Partner'})
+        self.assertEqual(partner.fusion_followup_run_count, 0)
+        for _ in range(3):
+            self.env['fusion.followup.run'].create({'partner_id': partner.id})
+        partner.invalidate_recordset(['fusion_followup_run_count', 'fusion_followup_run_ids'])
+        self.assertEqual(partner.fusion_followup_run_count, 3)
+
+    def test_action_view_followup_history_returns_action(self):
+        partner = self.env['res.partner'].create({'name': 'Action Partner'})
+        action = partner.action_view_followup_history()
+        self.assertEqual(action['res_model'], 'fusion.followup.run')
+        self.assertEqual(action['domain'], [('partner_id', '=', partner.id)])
+        self.assertEqual(action['context']['default_partner_id'], partner.id)

fusion_accounting_followup/tests/test_risk_scorer.py

@@ -0,0 +1,48 @@
+from odoo.tests.common import TransactionCase
+from odoo.tests import tagged
+from odoo.addons.fusion_accounting_followup.services.risk_scorer import (
+    score_partner, PartnerRiskScore,
+)
+
+
+@tagged('post_install', '-at_install')
+class TestRiskScorer(TransactionCase):
+
+    def test_no_history_returns_low(self):
+        result = score_partner()
+        self.assertEqual(result.band, 'low')
+        self.assertLess(result.score, 30)
+
+    def test_chronic_late_pays_returns_high(self):
+        result = score_partner(
+            total_invoices=20, paid_late_count=18,
+            avg_days_late=45, longest_overdue_days=90,
+            open_overdue_amount=15000, average_invoice_amount=2000,
+        )
+        self.assertIn(result.band, ('high', 'critical'))
+        self.assertGreater(len(result.drivers), 0)
+
+    def test_one_off_overdue_returns_medium(self):
+        result = score_partner(
+            total_invoices=10, paid_late_count=1,
+            avg_days_late=20, longest_overdue_days=45,
+            open_overdue_amount=2000, average_invoice_amount=2000,
+        )
+        self.assertIn(result.band, ('low', 'medium'))
+
+    def test_score_capped_at_100(self):
+        result = score_partner(
+            total_invoices=10, paid_late_count=10,
+            avg_days_late=180, longest_overdue_days=300,
+            open_overdue_amount=999999, average_invoice_amount=1000,
+        )
+        self.assertLessEqual(result.score, 100)
+
+    def test_score_floored_at_0(self):
+        result = score_partner()
+        self.assertGreaterEqual(result.score, 0)
+
+    def test_band_thresholds(self):
+        for s, expected_band in [(10, 'low'), (40, 'medium'), (70, 'high'), (90, 'critical')]:
+            r = PartnerRiskScore(score=s, band=expected_band, drivers=[])
+            self.assertEqual(r.band, expected_band)

fusion_accounting_followup/tests/test_tone_selector.py

@@ -0,0 +1,25 @@
+from odoo.tests.common import TransactionCase
+from odoo.tests import tagged
+from odoo.addons.fusion_accounting_followup.services.tone_selector import select_tone
+
+
+@tagged('post_install', '-at_install')
+class TestToneSelector(TransactionCase):
+
+    def test_level_1_default_gentle(self):
+        self.assertEqual(select_tone(level_sequence=1), 'gentle')
+
+    def test_level_2_default_firm(self):
+        self.assertEqual(select_tone(level_sequence=2), 'firm')
+
+    def test_level_3_default_legal(self):
+        self.assertEqual(select_tone(level_sequence=3), 'legal')
+
+    def test_critical_risk_escalates_gentle_to_firm(self):
+        self.assertEqual(select_tone(level_sequence=1, risk_score=85), 'firm')
+
+    def test_extreme_risk_escalates_firm_to_legal(self):
+        self.assertEqual(select_tone(level_sequence=2, risk_score=95), 'legal')
+
+    def test_unknown_level_defaults_gentle(self):
+        self.assertEqual(select_tone(level_sequence=99), 'gentle')

fusion_accounting_followup/views/menu_views.xml

@@ -0,0 +1,69 @@
+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <!-- Top-level menu (visible only when account_followup Enterprise NOT installed) -->
+    <menuitem id="menu_fusion_followup_root"
+              name="Customer Follow-ups"
+              sequence="70"
+              web_icon="fusion_accounting_followup,static/description/icon.png"
+              groups="fusion_accounting_core.group_fusion_show_when_enterprise_absent"/>
+
+    <!-- Partners list (gated to overdue) -->
+    <record id="action_fusion_followup_partners" model="ir.actions.act_window">
+        <field name="name">Overdue Customers</field>
+        <field name="res_model">res.partner</field>
+        <field name="view_mode">list,form</field>
+        <field name="domain">[('fusion_followup_status', 'in', ('action_due', 'paused', 'blocked', 'with_credit_team'))]</field>
+        <field name="context">{}</field>
+        <field name="help" type="html">
+            <p class="o_view_nocontent_smiling_face">
+                Customer follow-ups
+            </p>
+            <p>
+                AI-augmented dunning sequences for unpaid invoices.
+            </p>
+        </field>
+    </record>
+
+    <menuitem id="menu_fusion_followup_partners"
+              name="Overdue Customers"
+              parent="menu_fusion_followup_root"
+              action="action_fusion_followup_partners"
+              sequence="10"
+              groups="fusion_accounting_core.group_fusion_show_when_enterprise_absent"/>
+
+    <!-- Levels config -->
+    <record id="action_fusion_followup_levels" model="ir.actions.act_window">
+        <field name="name">Follow-up Levels</field>
+        <field name="res_model">fusion.followup.level</field>
+        <field name="view_mode">list,form</field>
+    </record>
+
+    <menuitem id="menu_fusion_followup_levels"
+              name="Levels"
+              parent="menu_fusion_followup_root"
+              action="action_fusion_followup_levels"
+              sequence="20"
+              groups="fusion_accounting_core.group_fusion_show_when_enterprise_absent"/>
+
+    <!-- Run history -->
+    <record id="action_fusion_followup_runs" model="ir.actions.act_window">
+        <field name="name">Follow-up History</field>
+        <field name="res_model">fusion.followup.run</field>
+        <field name="view_mode">list,form</field>
+    </record>
+
+    <menuitem id="menu_fusion_followup_runs"
+              name="History"
+              parent="menu_fusion_followup_root"
+              action="action_fusion_followup_runs"
+              sequence="30"
+              groups="fusion_accounting_core.group_fusion_show_when_enterprise_absent"/>
+
+    <!-- Batch wizard -->
+    <menuitem id="menu_fusion_followup_batch"
+              name="Batch Send..."
+              parent="menu_fusion_followup_root"
+              action="action_fusion_batch_followup_wizard"
+              sequence="40"
+              groups="fusion_accounting_core.group_fusion_show_when_enterprise_absent"/>
+</odoo>

fusion_accounting_followup/wizards/__init__.py

@@ -0,0 +1 @@
+from . import batch_followup_wizard

fusion_accounting_followup/wizards/batch_followup_wizard.py

@@ -0,0 +1,91 @@
+"""Batch send follow-ups to selected partners (or all overdue)."""
+
+from datetime import date
+
+from odoo import _, api, fields, models
+from odoo.exceptions import UserError
+
+
+class FusionBatchFollowupWizard(models.TransientModel):
+    _name = "fusion.batch.followup.wizard"
+    _description = "Batch Send Follow-ups Wizard"
+
+    scope = fields.Selection([
+        ('selected', 'Selected partners only'),
+        ('all_overdue', 'All overdue partners'),
+    ], required=True, default='selected')
+    partner_ids = fields.Many2many('res.partner',
+                                       default=lambda self: self._default_partner_ids())
+    force = fields.Boolean(string='Force (override pause + manual review)',
+                                default=False)
+    auto_resolve_level = fields.Boolean(
+        string='Auto-resolve level',
+        default=True,
+        help="If True, engine picks the appropriate level per partner. "
+             "If False, use the chosen override level for all.")
+    override_level_id = fields.Many2one('fusion.followup.level')
+
+    # Results
+    state = fields.Selection([('draft', 'Draft'), ('done', 'Done')], default='draft')
+    sent_count = fields.Integer(readonly=True)
+    skipped_count = fields.Integer(readonly=True)
+    error_count = fields.Integer(readonly=True)
+    summary = fields.Text(readonly=True)
+
+    @api.model
+    def _default_partner_ids(self):
+        ctx = self.env.context
+        if ctx.get('active_model') == 'res.partner':
+            return ctx.get('active_ids', [])
+        return []
+
+    def action_run(self):
+        self.ensure_one()
+        if self.scope == 'selected' and not self.partner_ids:
+            raise UserError(_("No partners selected."))
+
+        partners = self.partner_ids
+        if self.scope == 'all_overdue':
+            Line = self.env['account.move.line'].sudo()
+            overdue_partner_ids = Line.search([
+                ('parent_state', '=', 'posted'),
+                ('account_id.account_type', '=', 'asset_receivable'),
+                ('reconciled', '=', False),
+                ('amount_residual', '>', 0),
+                ('date_maturity', '<', date.today()),
+                ('company_id', '=', self.env.company.id),
+            ]).mapped('partner_id').ids
+            partners = self.env['res.partner'].sudo().browse(overdue_partner_ids)
+
+        engine = self.env['fusion.followup.engine']
+        sent = 0
+        skipped = 0
+        errors = []
+        for partner in partners:
+            try:
+                with self.env.cr.savepoint():
+                    level = self.override_level_id if not self.auto_resolve_level else None
+                    result = engine.send_followup_email(
+                        partner, level=level, force=self.force)
+                    status = result.get('status', '')
+                    if status == 'sent':
+                        sent += 1
+                    else:
+                        skipped += 1
+            except Exception as e:
+                errors.append(f"{partner.name}: {e}")
+
+        self.write({
+            'state': 'done',
+            'sent_count': sent,
+            'skipped_count': skipped,
+            'error_count': len(errors),
+            'summary': '\n'.join(errors[:20]) if errors else False,
+        })
+        return {
+            'type': 'ir.actions.act_window',
+            'res_model': self._name,
+            'res_id': self.id,
+            'view_mode': 'form',
+            'target': 'new',
+        }

fusion_accounting_followup/wizards/batch_followup_wizard_views.xml

@@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <record id="view_fusion_batch_followup_wizard_form" model="ir.ui.view">
+        <field name="name">fusion.batch.followup.wizard.form</field>
+        <field name="model">fusion.batch.followup.wizard</field>
+        <field name="arch" type="xml">
+            <form string="Batch Follow-ups">
+                <group invisible="state == 'done'">
+                    <field name="scope" widget="radio"/>
+                    <field name="partner_ids" widget="many2many_tags"
+                           invisible="scope != 'selected'"
+                           required="scope == 'selected'"/>
+                    <field name="auto_resolve_level"/>
+                    <field name="override_level_id"
+                           options="{'no_create': True}"
+                           invisible="auto_resolve_level"
+                           required="not auto_resolve_level"/>
+                    <field name="force"/>
+                </group>
+                <group invisible="state != 'done'" string="Results">
+                    <field name="sent_count"/>
+                    <field name="skipped_count"/>
+                    <field name="error_count"/>
+                    <field name="summary"/>
+                </group>
+                <field name="state" invisible="1"/>
+                <footer>
+                    <button name="action_run" type="object" string="Run"
+                            class="btn-primary" invisible="state == 'done'"/>
+                    <button special="cancel" string="Close"/>
+                </footer>
+            </form>
+        </field>
+    </record>
+
+    <record id="action_fusion_batch_followup_wizard" model="ir.actions.act_window">
+        <field name="name">Batch Send Follow-ups</field>
+        <field name="res_model">fusion.batch.followup.wizard</field>
+        <field name="view_mode">form</field>
+        <field name="target">new</field>
+        <field name="binding_model_id" ref="base.model_res_partner"/>
+        <field name="binding_view_types">list</field>
+    </record>
+</odoo>

fusion_plating/fusion_plating_configurator/security/ir.model.access.csv

@@ -19,6 +19,8 @@ access_fp_quote_configurator_estimator,fp.quote.configurator.estimator,model_fp_
 access_fp_quote_configurator_manager,fp.quote.configurator.manager,model_fp_quote_configurator,fusion_plating.group_fusion_plating_manager,1,1,1,1
 access_fp_direct_order_wizard_estimator,fp.direct.order.wizard.estimator,model_fp_direct_order_wizard,fusion_plating_configurator.group_fp_estimator,1,1,1,1
 access_fp_direct_order_wizard_manager,fp.direct.order.wizard.manager,model_fp_direct_order_wizard,fusion_plating.group_fusion_plating_manager,1,1,1,1
+access_fp_direct_order_line_estimator,fp.direct.order.line.estimator,model_fp_direct_order_line,fusion_plating_configurator.group_fp_estimator,1,1,1,1
+access_fp_direct_order_line_manager,fp.direct.order.line.manager,model_fp_direct_order_line,fusion_plating.group_fusion_plating_manager,1,1,1,1
 access_fp_part_import_wizard_estimator,fp.part.catalog.import.wizard.estimator,model_fp_part_catalog_import_wizard,fusion_plating_configurator.group_fp_estimator,1,1,1,1
 access_fp_part_import_wizard_manager,fp.part.catalog.import.wizard.manager,model_fp_part_catalog_import_wizard,fusion_plating.group_fusion_plating_manager,1,1,1,1
 access_fp_customer_price_list_operator,fp.customer.price.list.operator,model_fp_customer_price_list,fusion_plating.group_fusion_plating_operator,1,0,0,0

fusion_plating/fusion_plating_configurator/wizard/__init__.py

@@ -3,4 +3,5 @@
 # License OPL-1 (Odoo Proprietary License v1.0)
 
 from . import fp_direct_order_wizard
+from . import fp_direct_order_line
 from . import fp_part_catalog_import_wizard

fusion_plating/fusion_plating_configurator/wizard/fp_direct_order_line.py

@@ -0,0 +1,46 @@
+# -*- coding: utf-8 -*-
+# Copyright 2026 Nexa Systems Inc.
+# License OPL-1 (Odoo Proprietary License v1.0)
+# Part of the Fusion Plating product family.
+
+from odoo import api, fields, models
+
+
+class FpDirectOrderLine(models.TransientModel):
+    _name = 'fp.direct.order.line'
+    _description = 'Fusion Plating - Direct Order Line'
+    _order = 'sequence, id'
+
+    wizard_id = fields.Many2one(
+        'fp.direct.order.wizard',
+        required=True,
+        ondelete='cascade',
+    )
+    sequence = fields.Integer(default=10)
+
+    part_catalog_id = fields.Many2one(
+        'fp.part.catalog',
+        string='Part',
+        required=True,
+    )
+    coating_config_id = fields.Many2one(
+        'fp.coating.config',
+        string='Primary Treatment',
+        required=True,
+    )
+    quantity = fields.Integer(string='Qty', default=1, required=True)
+    currency_id = fields.Many2one(related='wizard_id.currency_id')
+    unit_price = fields.Monetary(
+        string='Unit Price',
+        currency_field='currency_id',
+    )
+    line_subtotal = fields.Monetary(
+        string='Subtotal',
+        currency_field='currency_id',
+        compute='_compute_line_subtotal',
+    )
+
+    @api.depends('quantity', 'unit_price')
+    def _compute_line_subtotal(self):
+        for rec in self:
+            rec.line_subtotal = (rec.quantity or 0) * (rec.unit_price or 0.0)