from odoo import fields, models


class SaleOrder(models.Model):
    _inherit = "sale.order"

    l10n_ec_sri_payment_id = fields.Many2one(
        comodel_name="l10n_ec.sri.payment",
        string="Payment Method (SRI)",
        help="Ecuador: Payment Methods Defined by the SRI.",
        default=lambda self: self.env['l10n_ec.sri.payment'].sudo().search([], limit=1),
    )

    def _prepare_invoice(self):
        res = super()._prepare_invoice()
        if self.country_code == 'EC':
            res['l10n_ec_sri_payment_id'] = self.l10n_ec_sri_payment_id.id
        return res

    def _create_invoices(self, grouped=False, final=False, date=None):
        """ Create invoice(s) for the given Sales Order(s).

        :param bool grouped: if True, invoices are grouped by SO id.
            If False, invoices are grouped by keys returned by :meth:`_get_invoice_grouping_keys`
        :param bool final: if True, refunds will be generated if necessary
        :param date: unused parameter
        :returns: created invoices
        :rtype: `account.move` recordset
        :raises: UserError if one of the orders has no invoiceable lines.
        """
        moves = super()._create_invoices(grouped=grouped, final=final, date=date)
        for move in moves:
            if move.transaction_ids:
                sri_payment_methods = move.transaction_ids.mapped(
                    'payment_method_id.l10n_ec_sri_payment_id'
                )
                if len(sri_payment_methods) == 1:
                    move.l10n_ec_sri_payment_id = sri_payment_methods
        return moves