"""Inherit account.bank.statement.line to add Phase 1 widget compute fields.

These fields are NOT stored — they're computed on-the-fly so the OWL widget
can render confidence badges without round-tripping. Performance OK because
the widget loads ~50-200 lines per kanban open and each compute is a single
indexed query into fusion.reconcile.suggestion.
"""

from odoo import api, fields, models


class AccountBankStatementLine(models.Model):
    _inherit = "account.bank.statement.line"

    # Top suggestion + its band — for the inline AI confidence badge
    fusion_top_suggestion_id = fields.Many2one(
        'fusion.reconcile.suggestion',
        compute='_compute_top_suggestion',
        store=False,
        help="Highest-ranked pending AI suggestion for this line")
    fusion_confidence_band = fields.Selection(
        [('high', 'High'), ('medium', 'Medium'), ('low', 'Low'), ('none', 'None')],
        compute='_compute_top_suggestion',
        store=False,
        default='none',
        help="Quick-render colour band for the OWL widget badge")

    # Mirror of Enterprise's bank_statement_attachment_ids surface field.
    # Defined here so fusion's widget can render attachments without
    # depending on account_accountant being installed.
    bank_statement_attachment_ids = fields.One2many(
        'ir.attachment',
        compute='_compute_bank_statement_attachment_ids',
        help="Attachments on the underlying account.move; mirrored for the OWL widget")

    def _compute_top_suggestion(self):
        Suggestion = self.env['fusion.reconcile.suggestion'].sudo()
        for line in self:
            top = Suggestion.search([
                ('statement_line_id', '=', line.id),
                ('state', '=', 'pending'),
                ('rank', '=', 1),
            ], limit=1)
            line.fusion_top_suggestion_id = top
            line.fusion_confidence_band = top.confidence_band if top else 'none'

    @api.depends('move_id', 'move_id.attachment_ids')
    def _compute_bank_statement_attachment_ids(self):
        for line in self:
            line.bank_statement_attachment_ids = (
                line.move_id.attachment_ids if line.move_id else self.env['ir.attachment']
            )