# -*- coding: utf-8 -*-
##############################################################################
#
#    OpenERP, Open Source Management Solution
#    Copyright (C) 2004-2009 Tiny SPRL (<http://tiny.be>).
#    Copyright (C) 2013 initOS GmbH & Co. KG (<http://www.initos.com>).
#    Author Thomas Rehn <thomas.rehn at initos.com>
#    Copyright (C) 2016 Camptocamp SA (<http://www.camptocamp.com>).
#
#    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 api, models, exceptions, _


class ResPartner(models.Model):
    """Assigns 'ref' from a sequence on creation and copying"""

    _inherit = 'res.partner'

    @api.model
    def create(self, vals):
        if not vals.get('ref') and self._needsRef(vals=vals):
            vals['ref'] = self.env['ir.sequence'].next_by_code('res.partner')
        return super(ResPartner, self).create(vals)

    @api.multi
    def copy(self, default=None):
        default = default or {}
        if self._needsRef():
            default['ref'] = self.env['ir.sequence'].\
                next_by_code('res.partner')
        return super(ResPartner, self).copy(default)

    @api.multi
    def write(self, vals):
        for partner in self:
            if not vals.get('ref') and partner._needsRef(vals):
                vals['ref'] = self.env['ir.sequence'].\
                    next_by_code('res.partner')
            super(ResPartner, partner).write(vals)
        return True

    @api.multi
    def _needsRef(self, vals=None):
        """
        Checks whether a sequence value should be assigned to a partner's 'ref'

        :param cr: database cursor
        :param uid: current user id
        :param id: id of the partner object
        :param vals: known field values of the partner object
        :return: true iff a sequence value should be assigned to the\
                      partner's 'ref'
        """
        if not vals and not self:  # pragma: no cover
            raise exceptions.UserError(_(
                'Either field values or an id must be provided.'))
        # only assign a 'ref' to commercial partners
        if self:
            vals = {}
            vals['is_company'] = self.is_company
            vals['parent_id'] = self.parent_id
        return vals.get('is_company') or not vals.get('parent_id')

    @api.model
    def _commercial_fields(self):
        """
        Make the partner reference a field that is propagated
        to the partner's contacts
        """
        return super(ResPartner, self)._commercial_fields() + ['ref']