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+# Phase 2 — Fusion Accounting Reports Implementation Plan
+
+**Module:** `fusion_accounting_reports`
+**Branch:** `fusion_accounting/phase-2-reports`
+**Pre-phase tag:** `fusion_accounting/pre-phase-2`
+**Estimated tasks:** 46
+**Reference:** `/Users/gurpreet/Github/RePackaged-Odoo/accounting/account_reports/`
+
+## Goal
+
+Replace Odoo Enterprise's `account_reports` module with a Fusion-native financial reports engine. CORE scope: P&L (income statement), balance sheet, trial balance, general ledger with drill-down. AI augmentation: anomaly detection (variance vs prior period) + AI-generated commentary. Coexists with Enterprise (Enterprise wins by default; Fusion menu shows when Enterprise absent).
+
+## Architecture (HYBRID engine)
+
+```
+fusion.report.engine (AbstractModel)        ← shared primitives
+├── compute_pnl(period, comparison=None)
+├── compute_balance_sheet(date_to, comparison=None)
+├── compute_trial_balance(period)
+├── compute_gl(period, account_ids=None)
+├── drill_down(report_type, line_id, period)
+└── _walk_account_hierarchy(root_account_ids)
+
+services/                                    ← pure-Python
+├── date_periods.py      → fiscal-period math, comparison-period derivation
+├── account_hierarchy.py → recursive account tree walk + roll-ups
+├── totaling.py          → balance/credit/debit aggregation rules
+├── currency_conversion.py → multi-currency revaluation at report date
+├── anomaly_detection.py → variance vs prior-period statistical flags
+└── commentary_generator.py → LLM prompt + parse for narrative
+
+models/
+├── fusion_report.py             → report definition (metadata, line specs)
+├── fusion_report_engine.py      → AbstractModel orchestrator
+├── fusion_report_pnl.py         → P&L definition + execute
+├── fusion_report_balance_sheet.py
+├── fusion_report_trial_balance.py
+├── fusion_report_general_ledger.py
+├── fusion_report_anomaly.py     → persisted flagged variances
+├── fusion_report_commentary.py  → cached AI narratives
+└── fusion_unreconciled_gl_mv.py → MV for fast GL listing on large DBs
+
+controllers/bank_rec_controller.py            ← 8 JSON-RPC endpoints
+├── /fusion/reports/run                        → execute one report
+├── /fusion/reports/drill_down                 → drill into a report line
+├── /fusion/reports/get_anomalies              → list flagged variances
+├── /fusion/reports/get_commentary             → fetch / regenerate narrative
+├── /fusion/reports/compare_periods            → side-by-side comparison
+├── /fusion/reports/export_pdf                 → PDF export
+├── /fusion/reports/export_xlsx                → XLSX export
+└── /fusion/reports/list_available             → list all report types
+
+static/src/
+├── scss/                          ← report-specific design tokens
+├── services/reports_service.js    ← reactive state + RPC wrappers
+├── views/reports_viewer/          ← top-level OWL controller
+└── components/                    ← report_table, drill_down_dialog,
+                                     period_filter, ai_commentary_panel,
+                                     anomaly_strip
+```
+
+## Coexistence
+
+Same pattern as Phase 1: `group_fusion_show_when_enterprise_absent` from `fusion_accounting_core`. Reports menu only visible when `account_reports` is NOT installed. Engine + AI tools always available.
+
+## Tasks (46 total)
+
+### Group 1: Foundation (tasks 1-2)
+1. Safety net (tag pre-phase-2, branch phase-2-reports) — **DONE**
+2. Plan doc + module skeleton
+
+### Group 2: Engine primitives — TDD layered (tasks 3-8)
+3. `services/date_periods.py` (fiscal periods, comparison derivation)
+4. `services/currency_conversion.py` + `services/account_hierarchy.py` + `services/totaling.py`
+5. `models/fusion_report.py` (report definition model)
+6. `services/line_resolver.py` (compute report rows from definition)
+7. `services/drill_down_resolver.py`
+8. `models/fusion_report_engine.py` (5-method API: compute_pnl, compute_balance_sheet, compute_trial_balance, compute_gl, drill_down)
+
+### Group 3: Per-report models (tasks 9-12)
+9. P&L (income statement)
+10. Balance sheet
+11. Trial balance
+12. General ledger
+
+### Group 4: AI features (tasks 13-17)
+13. Anomaly detection service (variance vs prior period)
+14. AI commentary service
+15. Commentary prompt + LLMProvider integration
+16. `fusion.report.commentary` persisted model
+17. `fusion.report.anomaly` persisted model
+
+### Group 5: Backend wiring (tasks 18-20)
+18. JSON-RPC controller (8 endpoints)
+19. ReportsAdapter `_via_fusion` paths
+20. 5 new AI tools
+
+### Group 6: Tests + perf (tasks 21-25)
+21. Property-based tests (totals balance invariant)
+22. Integration tests — P&L correctness vs known fixtures
+23. Integration tests — balance sheet + trial balance
+24. Materialized view for GL
+25. Cron jobs (anomaly scan + commentary refresh)
+
+### Group 7: Frontend (tasks 26-33)
+26. SCSS tokens + main report stylesheet
+27. `reports_service.js`
+28. `report_viewer` component (top-level)
+29. `report_table` component (rows, totals, drill chevrons)
+30. `drill_down_dialog`
+31. `period_filter` (date range + comparison toggle)
+32. `ai_commentary_panel` (Fusion-only)
+33. `anomaly_strip` (Fusion-only)
+
+### Group 8: Export + wizards (tasks 34-36)
+34. PDF export (QWeb template per report)
+35. XLSX export wizard
+36. Period selection + comparison wizard
+
+### Group 9: Migration + coexistence (tasks 37-39)
+37. Migration wizard inheritance (cache existing definitions)
+38. Menu + window actions with coexistence group filter
+39. Coexistence test
+
+### Group 10: Final tests + polish (tasks 40-46)
+40. 5 OWL tour tests
+41. Performance benchmarks
+42. Optimize if benchmarks fail (conditional)
+43. Local LLM compat test for commentary
+44. Update meta-module manifest
+45. CLAUDE.md, UPGRADE_NOTES.md, README.md
+46. End-to-end smoke + tag phase-2-complete + push
+
+## Performance Targets (P95)
+
+- `engine.compute_pnl` (1 year, 500 accounts): <2s
+- `engine.compute_balance_sheet`: <2s
+- `engine.compute_trial_balance`: <1s
+- `engine.compute_gl` (1 month, all accounts): <3s
+- `engine.drill_down` (1 line): <500ms
+- Controller `run` endpoint: <2.5s
+
+## V19 Conventions (from Phase 1 lessons)
+
+- `models.Constraint` not `_sql_constraints`
+- No `@api.depends('id')` on stored compute fields
+- `@route(type='jsonrpc')` not `type='json'`
+- `ir.cron` has no `numbercall` field
+- `res.groups.user_ids` not `users`
+- `ir.ui.menu.group_ids` not `groups_id`
+- `res.users.all_group_ids` for searches
+- `models.Constraint` for unique-keys
+- Prefer `env.flush_all()` before MV REFRESH
+
+## Test Targets
+
+Match Phase 1's test pyramid:
+- Unit (services pure-Python)
+- Integration (engine end-to-end with factories)
+- Property-based (Hypothesis, totals balance invariant)
+- Controller (HttpCase JSON-RPC)
+- MV correctness
+- Performance benchmarks (tagged 'benchmark')
+- OWL tours (tagged 'tour')
+- Local LLM smoke (tagged 'local_llm', skips when no LLM)
+
+Phase 1 final: 157 tests passing. Phase 2 target: ~120-150 additional.
diff --git a/fusion_accounting_reports/__init__.py b/fusion_accounting_reports/__init__.py
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diff --git a/fusion_accounting_reports/__manifest__.py b/fusion_accounting_reports/__manifest__.py
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+{
+    'name': 'Fusion Accounting Reports',
+    'version': '19.0.1.0.0',
+    'category': 'Accounting/Accounting',
+    'summary': 'AI-augmented financial reports (P&L, balance sheet, trial balance, GL).',
+    'description': """
+Fusion Accounting Reports
+=========================
+
+A Fusion-native replacement for Odoo Enterprise's account_reports module.
+
+CORE scope (Phase 2):
+- Income Statement (P&L)
+- Balance Sheet
+- Trial Balance
+- General Ledger (with drill-down)
+
+AI augmentation:
+- Anomaly detection (variance vs prior period)
+- AI commentary (LLM-generated narrative)
+
+Coexists with Enterprise: when account_reports is installed, the Fusion
+menu hides; the engine and AI tools remain available for the chat.
+""",
+    'author': 'Fusion Accounting',
+    'license': 'LGPL-3',
+    'depends': [
+        'fusion_accounting_core',
+        'fusion_accounting_ai',
+        'account',
+    ],
+    'data': [
+        'security/ir.model.access.csv',
+    ],
+    'assets': {
+        'web.assets_backend': [
+        ],
+    },
+    'installable': True,
+    'auto_install': False,
+    'application': False,
+    'icon': '/fusion_accounting_reports/static/description/icon.png',
+}
diff --git a/fusion_accounting_reports/controllers/__init__.py b/fusion_accounting_reports/controllers/__init__.py
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diff --git a/fusion_accounting_reports/models/__init__.py b/fusion_accounting_reports/models/__init__.py
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diff --git a/fusion_accounting_reports/reports/__init__.py b/fusion_accounting_reports/reports/__init__.py
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diff --git a/fusion_accounting_reports/security/ir.model.access.csv b/fusion_accounting_reports/security/ir.model.access.csv
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+id,name,model_id:id,group_id:id,perm_read,perm_write,perm_create,perm_unlink
diff --git a/fusion_accounting_reports/services/__init__.py b/fusion_accounting_reports/services/__init__.py
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diff --git a/fusion_accounting_reports/tests/__init__.py b/fusion_accounting_reports/tests/__init__.py
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diff --git a/fusion_accounting_reports/wizards/__init__.py b/fusion_accounting_reports/wizards/__init__.py
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