# -*- coding: utf-8 -*-
"""
    rhodecode.model.permission
    ~~~~~~~~~~~~~~~~~~~~~~~~~~

    permissions model for RhodeCode
    
    :created_on: Aug 20, 2010
    :author: marcink
    :copyright: (C) 2009-2010 Marcin Kuzminski <marcin@python-works.com>    
    :license: GPLv3, see COPYING for more details.
"""
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import logging
import traceback

from sqlalchemy.exc import DatabaseError

from rhodecode.model import BaseModel
from rhodecode.model.db import User, Permission, UserToPerm, RepoToPerm
from rhodecode.model.caching_query import FromCache

log = logging.getLogger(__name__)


class PermissionModel(BaseModel):
    """Permissions model for RhodeCode
    """

    def get_permission(self, permission_id, cache=False):
        """Get's permissions by id
        
        :param permission_id: id of permission to get from database
        :param cache: use Cache for this query
        """
        perm = self.sa.query(Permission)
        if cache:
            perm = perm.options(FromCache("sql_cache_short",
                                          "get_permission_%s" % permission_id))
        return perm.get(permission_id)

    def get_permission_by_name(self, name, cache=False):
        """Get's permissions by given name
        
        :param name: name to fetch
        :param cache: Use cache for this query
        """
        perm = self.sa.query(Permission)\
            .filter(Permission.permission_name == name)
        if cache:
            perm = perm.options(FromCache("sql_cache_short",
                                          "get_permission_%s" % name))
        return perm.scalar()

    def update(self, form_result):
        perm_user = self.sa.query(User)\
                .filter(User.username == form_result['perm_user_name']).scalar()
        u2p = self.sa.query(UserToPerm).filter(UserToPerm.user == perm_user).all()
        if len(u2p) != 3:
            raise Exception('Defined: %s should be 3  permissions for default'
                            ' user. This should not happen please verify'
                            ' your database' % len(u2p))

        try:
            #stage 1 change defaults    
            for p in u2p:
                if p.permission.permission_name.startswith('repository.'):
                    p.permission = self.get_permission_by_name(
                                       form_result['default_perm'])
                    self.sa.add(p)

                if p.permission.permission_name.startswith('hg.register.'):
                    p.permission = self.get_permission_by_name(
                                       form_result['default_register'])
                    self.sa.add(p)

                if p.permission.permission_name.startswith('hg.create.'):
                    p.permission = self.get_permission_by_name(
                                        form_result['default_create'])
                    self.sa.add(p)

            #stage 2 update all default permissions for repos if checked
            if form_result['overwrite_default'] == True:
                for r2p in self.sa.query(RepoToPerm)\
                               .filter(RepoToPerm.user == perm_user).all():
                    r2p.permission = self.get_permission_by_name(
                                         form_result['default_perm'])
                    self.sa.add(r2p)

            #stage 3 set anonymous access
            if perm_user.username == 'default':
                perm_user.active = bool(form_result['anonymous'])
                self.sa.add(perm_user)


            self.sa.commit()
        except (DatabaseError,):
            log.error(traceback.format_exc())
            self.sa.rollback()
            raise