"""Per-partner bank reconciliation pattern aggregate.

One row per (company_id, partner_id). Continuously summarises HOW this
partner gets reconciled. Recomputed nightly via cron from the precedent
table. Used as a feature input to confidence_scoring.
"""

from odoo import fields, models


class FusionReconcilePattern(models.Model):
    _name = "fusion.reconcile.pattern"
    _description = "Per-partner bank reconciliation pattern aggregate"
    _rec_name = "partner_id"

    company_id = fields.Many2one('res.company', required=True, index=True,
                                   default=lambda self: self.env.company)
    partner_id = fields.Many2one('res.partner', required=True, index=True)

    # Volume + cadence
    reconcile_count = fields.Integer(default=0,
        help="Total past reconciles for this partner")
    typical_amount_range = fields.Char(
        help="e.g. '$1,200 – $2,400 (median $1,847.50)'")
    typical_cadence_days = fields.Float(
        help="Mean inter-reconcile days")
    typical_day_of_month = fields.Char(
        help="e.g. '1st, 15th'")

    # Matching strategy used historically
    pref_strategy = fields.Selection([
        ('exact_amount', 'Exact-amount-first'),
        ('fifo', 'FIFO oldest-due-first'),
        ('multi_invoice', 'Multi-invoice consolidation'),
        ('cherry_pick', 'Cherry-pick specific invoices'),
    ])
    pref_account_id = fields.Many2one('account.account',
        help="Most-used target account")

    # Memo signature
    common_memo_tokens = fields.Char(
        help="Comma-separated tokens that appear in ≥30% of past reconciles")

    # Tax + write-off habits
    common_writeoff_account_id = fields.Many2one('account.account')
    common_writeoff_tax_id = fields.Many2one('account.tax')
    typical_writeoff_amount = fields.Float(
        help="e.g. 0.05 for rounding diffs")

    last_refreshed_at = fields.Datetime()

    _uniq_company_partner = models.Constraint(
        'unique(company_id, partner_id)',
        'One pattern row per (company, partner) — already exists.',
    )