# 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

from rhodecode.model import meta

log = logging.getLogger(__name__)

def init_model(engine):

    """

    Initializes db session, bind the engine with the metadata,

    Call this before using any of the tables or classes in the model,

    preferably once in application start

    :param engine: engine to bind to

    log.info("initializing db for %s" % engine)

    meta.Base.metadata.bind = engine

class BaseModel(object):

    """

    Base Model for all RhodeCode models, it adds sql alchemy session

    into instance of model

    :param sa: If passed it reuses this session instead of creating a new one

    """

    def __init__(self, sa=None):

        if sa is not None:

            self.sa = sa

        else:

    def _get_instance(self, cls, instance, callback=None):

        """

        Get's instance of given cls using some simple lookup mechanism.

        :param cls: class to fetch

        :param instance: int or Instance

        :param callback: callback to call if all lookups failed

        """

        if isinstance(instance, cls):

            return instance

                        'got %s, no callback provided' % (cls, type(instance))

                    )

                else:

                    return callback(instance)

    def _get_user(self, user):

        """

        Helper method to get user by ID, or username fallback

        :param user:

        :type user: UserID, username, or User instance

        """

        return self._get_instance(User, user,

                                  callback=User.get_by_username)

    def _get_repo(self, repository):

        """

        Helper method to get repository by ID, or repository name

        :param repository:

        :type repository: RepoID, repository name or Repository Instance

        """

        return self._get_instance(Repository, repository,

                                  callback=Repository.get_by_repo_name)

    def _get_perm(self, permission):

        """

        Helper method to get permission by ID, or permission name

        :param permission:

        :type permission: PermissionID, permission_name or Permission instance

        """

        return self._get_instance(Permission, permission,

                                  callback=Permission.get_by_key)