from odoo import models, fields, api, _
from odoo.exceptions import ValidationError

class PosPayment(models.Model):
    _inherit = 'pos.payment'

    def write(self, vals):
        if 'payment_method_id' in vals:
            # Check if current user is not a POS Manager
            if not self.env.user.has_group('point_of_sale.group_pos_manager'):
                raise ValidationError(_(
                    "Only POS Managers are allowed to edit payment methods."
                ))
            
            for payment in self:
                # Enforce the validation rules
                if not payment.pos_order_id.is_payment_editable:
                    raise ValidationError(_(
                        "You cannot edit the payment method because the POS session is closed "
                        "or the accounting journal has already been posted."
                    ))
                    
        return super(PosPayment, self).write(vals)