"""Per-historical-decision reconciliation memory.

One row per past reconciliation. Holds the full feature vector + outcome,
used by precedent_lookup for K-nearest-neighbour search when scoring a
new bank line.
"""

from odoo import fields, models


class FusionReconcilePrecedent(models.Model):
    _name = "fusion.reconcile.precedent"
    _description = "Historical bank reconciliation decision (memory)"
    _order = "reconciled_at desc, id desc"

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

    # Bank line features (the "input")
    amount = fields.Monetary(currency_field='currency_id')
    currency_id = fields.Many2one('res.currency')
    date = fields.Date()
    memo_tokens = fields.Char(
        help="Comma-separated normalized memo tokens (output of memo_tokenizer)")
    journal_id = fields.Many2one('account.journal')

    # Outcome (the "decision made")
    matched_move_line_count = fields.Integer(
        help="1 = exact, 2-3 = consolidation, etc.")
    matched_account_ids = fields.Char(
        help="Comma-separated account.account IDs that were matched against")
    matched_invoice_ages_days = fields.Char(
        help="Comma-separated days-old at reconcile time, e.g. '12, 45, 78'")
    write_off_amount = fields.Float()
    write_off_account_id = fields.Many2one('account.account')
    exchange_diff = fields.Boolean()

    # Provenance
    reconciler_user_id = fields.Many2one('res.users')
    reconciled_at = fields.Datetime()
    source = fields.Selection([
        ('historical_bootstrap', 'Imported from history'),
        ('backfill', 'Backfilled from account.partial.reconcile (migration)'),
        ('manual', 'Manual reconcile via fusion'),
        ('ai_accepted', 'AI suggestion accepted'),
        ('auto_rule', 'account.reconcile.model auto-fired'),
    ], required=True)

    # No uniqueness constraint — multiple reconciles can share features