import logging

from odoo import models, api

_logger = logging.getLogger(__name__)


class AccountMoveAuditHook(models.Model):
    _inherit = 'account.move'

    def action_post(self):
        res = super().action_post()

        ICP = self.env['ir.config_parameter'].sudo()
        if ICP.get_param('fusion_accounting.enable_post_audit', 'False') != 'True':
            return res

        for move in self:
            try:
                self._fusion_audit_posted_entry(move)
            except Exception as e:
                _logger.warning("Fusion post-audit hook failed for %s: %s", move.name, e)

        return res

    def _fusion_audit_posted_entry(self, move):
        issues = []

        total_debit = sum(l.debit for l in move.line_ids)
        total_credit = sum(l.credit for l in move.line_ids)
        if abs(total_debit - total_credit) > 0.01:
            issues.append(f'Unbalanced: debit={total_debit:.2f}, credit={total_credit:.2f}')

        for line in move.line_ids:
            if not line.account_id:
                issues.append(f'Line missing account: {line.name}')
            # M6: Only flag missing tax when the product has taxes configured
            # (avoids false positives for HST-exempt healthcare services)
            if (line.product_id and not line.tax_ids
                    and move.move_type in ('out_invoice', 'out_refund', 'in_invoice', 'in_refund')):
                # Check if the product has default taxes configured
                product_taxes = line.product_id.taxes_id if move.move_type in ('out_invoice', 'out_refund') else line.product_id.supplier_taxes_id
                if product_taxes:
                    issues.append(f'Missing tax on product line: {line.product_id.name} (product has taxes configured but line has none)')

        if not move.line_ids:
            issues.append('Entry has no lines')

        if issues:
            body_parts = ['<strong>Fusion AI Auto-Audit</strong><ul>']
            for issue in issues:
                body_parts.append(f'<li>{issue}</li>')
            body_parts.append('</ul>')
            move.message_post(
                body=''.join(body_parts),
                message_type='comment',
                subtype_xmlid='mail.mt_note',
            )