# -*- coding: utf-8 -*-
##############################################################################
#
#    OpenERP, Open Source Management Solution
#    Copyright (C) 2004-2010 Tiny SPRL (<http://tiny.be>).
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU Affero General Public License as
#    published by the Free Software Foundation, either version 3 of the
#    License, or (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU Affero General Public License for more details.
#
#    You should have received a copy of the GNU Affero General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
##############################################################################

from odoo import models, fields, api

class account_invoice(models.Model):
    _inherit = "account.invoice"

    pro_number = fields.Char('Nº Pro-forma', size=10)
    internal_number = fields.Char('Invoice Number')
    
    @api.multi
    def write(self, vals):
    	if vals.get('state'):
    		if vals.get('state') == 'proforma2':
    			if not self.pro_number:
    				vals['pro_number'] = self.env['ir.sequence'].get('account.invoice.proforma2')
    	return super(account_invoice,self).write(vals)