#!/usr/bin/python2.5

#

# Copyright 2008 the Melange authors.

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

#   http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

"""Notification (Model) query functions.

"""

__authors__ = [

  '"Lennard de Rijk" <ljvderijk@gmail.com>',

  ]

from google.appengine.ext import db

from soc.cache import sidebar

from soc.logic.helper import notifications

from soc.logic.models import base

from soc.logic.models import user as user_logic

import soc.models.notification

class Logic(base.Logic):

  """Logic methods for the Notification model.

  """

  def __init__(self):

    """Defines the name, key_name and model for this entity.

    """

    super(Logic, self).__init__(model=soc.models.notification.Notification,

         base_model=None, scope_logic=user_logic)

  def _onCreate(self, entity):

    """Sends out a message if there is only one unread notification.

    """

    # create a special query on which we can call count

    query = db.Query(self._model)

    query.filter('scope =', entity.scope)

    query.filter('unread = ', True)

    # count the number of results with a maximum of two

    unread_count = query.count(2)

    if unread_count == 1:

      # there is only one unread notification so send out an email

      notifications.sendNewNotificationMessage(entity)

    sidebar.flush(entity.scope.account)

    super(Logic, self)._onCreate(entity)

  def _updateField(self, entity, entity_properties, name):

    """If unread changes we flush the sidebar cache.

    """

    value = entity_properties[name]

    if (name == 'unread') and (entity.unread != value):

      # in case that the unread value changes we flush the sidebar.

      sidebar.flush(entity.scope.account)

    return True

logic = Logic()