###################################################################################
# 
#    Copyright (C) 2017 MuK IT GmbH
#
#    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 Groups(models.AbstractModel):
    
    _name = 'muk_utils.mixins.groups'
    _description = 'Group Mixin'
    
    _parent_store = True
    _parent_name = "parent_group"
    
    #----------------------------------------------------------
    # Database
    #----------------------------------------------------------
    
    name = fields.Char(
        string="Group Name", 
        required=True, 
        translate=True)
    
    parent_path = fields.Char(
        string="Parent Path", 
        index=True)

    count_users = fields.Integer(
        compute='_compute_users',
        string="Users",
        store=True)
    
    @api.model
    def _add_magic_fields(self):
        super(Groups, self)._add_magic_fields()
        def add(name, field):
            if name not in self._fields:
                self._add_field(name, field)
        add('parent_group', fields.Many2one(
            _module=self._module,
            comodel_name=self._name,
            string='Parent Group', 
            ondelete='cascade', 
            auto_join=True,
            index=True,
            automatic=True))
        add('child_groups', fields.One2many(
            _module=self._module,
            comodel_name=self._name,
            inverse_name='parent_group', 
            string='Child Groups',
            automatic=True))
        add('groups', fields.Many2many(
            _module=self._module,
            comodel_name='res.groups',
            relation='%s_groups_rel' % (self._table),
            column1='gid',
            column2='rid',
            string='Groups',
            automatic=True))
        add('explicit_users', fields.Many2many(
            _module=self._module,
            comodel_name='res.users',
            relation='%s_explicit_users_rel' % (self._table),
            column1='gid',
            column2='uid', 
            string='Explicit Users',
            automatic=True))
        add('users', fields.Many2many(
            _module=self._module,
            comodel_name='res.users',
            relation='%s_users_rel' % (self._table),
            column1='gid',
            column2='uid', 
            string='Group Users',
            compute='_compute_users', 
            store=True,
            automatic=True))
    
    _sql_constraints = [
        ('name_uniq', 'unique (name)', 'The name of the group must be unique!')
    ]
    
    #----------------------------------------------------------
    # Functions
    #----------------------------------------------------------
    
    @api.model
    def default_get(self, fields_list):
        res = super(Groups, self).default_get(fields_list)
        if not self.env.context.get('groups_no_autojoin'):
            if 'explicit_users' in res and res['explicit_users']:
                res['explicit_users'] = res['explicit_users'] + [self.env.uid]
            else:
                res['explicit_users'] = [self.env.uid]
        return res
    
    #----------------------------------------------------------
    # Read, View 
    #----------------------------------------------------------
    
    @api.depends('parent_group', 'parent_group.users', 'groups', 'groups.users', 'explicit_users')
    def _compute_users(self):
        for record in self:
            users = record.mapped('groups.users')
            users |= record.mapped('explicit_users')
            users |= record.mapped('parent_group.users')
            record.update({'users': users, 'count_users': len(users)})