from odoo import api, fields, models


class AccountPayment(models.Model):
    _inherit = 'account.payment'

    # Computed residual amount field
    payment_residual = fields.Monetary(
        string='Payment Residual',
        compute='_compute_payment_residual',
        currency_field='currency_id',
        help="Residual amount of this payment (amount not yet reconciled)",
        readonly=True
    )

    # One2many to show journal items with residual amounts
    payment_move_line_ids = fields.One2many(
        'account.move.line',
        'payment_id',
        string='Payment Journal Items',
        domain=lambda self: [
            ('account_id.reconcile', '=', True),
            ('account_id.account_type', 'in', ['asset_receivable', 'liability_payable'])
        ],
        readonly=True
    )

    @api.depends('payment_move_line_ids.amount_residual', 
                 'payment_move_line_ids.account_id')
    def _compute_payment_residual(self):
        """Compute the residual amount from payment journal items"""
        for payment in self:
            if payment.state in ['draft', 'cancel'] or not payment.payment_move_line_ids:
                payment.payment_residual = 0.0
            else:
                # Get all reconcilable journal items for this payment
                reconcilable_lines = payment.payment_move_line_ids.filtered(
                    lambda l: l.account_id.reconcile and 
                             l.account_id.account_type in ['asset_receivable', 'liability_payable']
                )
                
                # Sum up the residual amounts
                total_residual = sum(reconcilable_lines.mapped('amount_residual'))
                
                # For display purposes, show absolute value with proper sign
                payment.payment_residual = total_residual

    def action_view_journal_items(self):
        """Action to view the payment's journal items"""
        self.ensure_one()
        return {
            'name': _('Payment Journal Items'),
            'view_mode': 'tree,form',
            'res_model': 'account.move.line',
            'domain': [('payment_id', '=', self.id)],
            'context': {
                'default_payment_id': self.id,
                'search_default_payment_id': self.id,
            },
            'type': 'ir.actions.act_window',
        }
from . import account_payment