# -*- coding: utf-8 -*-
##############################################################################
#
#    OpenERP, Open Source Management Solution
#    This module copyright (C) 2012 Therp BV (<http://therp.nl>).
#
#    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 logging
import inspect

from openerp.osv import fields, orm

from . import users_ldap_groups_operators


class CompanyLDAPGroupMapping(orm.Model):
    _name = 'res.company.ldap.group_mapping'
    _rec_name = 'ldap_attribute'
    _order = 'ldap_attribute'

    def _get_operators(self, cr, uid, context=None):
        operators = []
        members = inspect.getmembers(
            users_ldap_groups_operators,
            lambda cls: (inspect.isclass(cls) and
                         cls != users_ldap_groups_operators.LDAPOperator))
        for name, operator in members:
            operators.append((name, name))
        return tuple(operators)

    _columns = {
        'ldap_id': fields.many2one('res.company.ldap', 'LDAP server',
                                   required=True),
        'ldap_attribute': fields.char(
            'LDAP attribute', size=64,
            help='The LDAP attribute to check.\n'
                 'For active directory, use memberOf.'),
        'operator': fields.selection(
            _get_operators, 'Operator',
            help='The operator to check the attribute against the value\n'
            'For active directory, use \'contains\'', required=True),
        'value': fields.char(
            'Value', size=1024,
            help='The value to check the attribute against.\n'
            'For active directory, use the dn of the desired group',
            required=True),
        'group': fields.many2one(
            'res.groups', 'OpenERP group',
            help='The OpenERP group to assign', required=True),
    }


class CompanyLDAP(orm.Model):
    _inherit = 'res.company.ldap'

    _columns = {
        'group_mappings': fields.one2many(
            'res.company.ldap.group_mapping',
            'ldap_id', 'Group mappings',
            help='Define how OpenERP groups are assigned to ldap users'),
        'only_ldap_groups': fields.boolean(
            'Only ldap groups',
            help='If this is checked, manual changes to group membership are '
                 'undone on every login (so OpenERP groups are always '
                 'synchronous with LDAP groups). If not, manually added '
                 'groups are preserved.')
    }

    _default = {
        'only_ldap_groups': False,
    }

    def get_or_create_user(self, cr, uid,
                           conf,
                           login,
                           ldap_entry,
                           context=None):
        _super = super(CompanyLDAP, self)
        user_id = _super.get_or_create_user(cr, uid, conf, login,
                                            ldap_entry, context)
        if not user_id:
            return user_id
        logger = logging.getLogger('users_ldap_groups')
        mappingobj = self.pool.get('res.company.ldap.group_mapping')
        userobj = self.pool.get('res.users')
        conf_all = self.read(cr, uid, conf['id'], ['only_ldap_groups'])
        if(conf_all['only_ldap_groups']):
            logger.debug('deleting all groups from user %d', user_id)
            userobj.write(cr, uid,
                          [user_id],
                          {'groups_id': [(5, )]},
                          context=context)
        mapping_ids = mappingobj.search(cr, uid,
                                        [('ldap_id', '=', conf['id'])])
        for mapping in mappingobj.read(cr, uid, mapping_ids, []):
            operator = getattr(users_ldap_groups_operators,
                               mapping['operator'])()
            logger.debug('checking mapping %s', mapping)
            if operator.check_value(ldap_entry,
                                    mapping['ldap_attribute'],
                                    mapping['value'],
                                    conf,
                                    self,
                                    logger):
                logger.debug('adding user %d to group %s',
                             (user_id, mapping['group'][1]))
                userobj.write(cr, uid, [user_id],
                              {'groups_id': [(4, mapping['group'][0])]},
                              context=context)
        return user_id