# -*- coding: utf-8 -*-
##############################################################################
#
#    OpenERP, Open Source Management Solution
#    Copyright (C) 2015-TODAY Akretion (<http://www.akretion.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/>.
#
##############################################################################

import sys
from openerp import models, fields, api


class ProductTemplate(models.Model):
    _inherit = 'product.template'

    pos_categ_id = fields.Many2one('product.category',
                                   store=True, related='categ_id')

    @api.model
    def create(self, vals):
        vals['pos_categ_id'] = vals['categ_id']
        return super(ProductTemplate, self).create(vals)

    @api.multi
    def write(self, vals):
        if 'pos_categ_id' in vals and not vals['pos_categ_id']:
            del vals['pos_categ_id']
        return super(ProductTemplate, self).write(vals)


_auto_end_original = models.BaseModel._auto_end


def _auto_end(self, cr, context=None):
    """ Create the foreign keys recorded by _auto_init.
        (pos_product_category monkey patching)
    """
    context = context or {}
    module = context['module']
    foreign_keys = []
    patched = 'openerp.addons.pos_product_category' in sys.modules

    for t, k, r, d in self._foreign_keys:
        if patched and (t, k) == ('product_template', 'pos_categ_id'):
            if module == 'pos_product_category':
                cr.execute('''
                    ALTER TABLE product_template
                    DROP CONSTRAINT IF EXISTS
                    product_template_pos_categ_id_fkey
                ''')
                cr.execute('''
                    UPDATE product_template
                    SET pos_categ_id = categ_id;
                ''')
                cr.execute('''
                    ALTER TABLE product_template ADD CONSTRAINT
                    "product_template_pos_categ_id_fkey"
                    FOREIGN KEY (pos_categ_id)
                    REFERENCES product_category(id) ON DELETE SET NULL;
                ''')
            continue
        foreign_keys.append((t, k, r, d))
    self._foreign_keys = foreign_keys
    return _auto_end_original(self, cr, context=context)

models.BaseModel._auto_end = _auto_end