#!/usr/bin/python2.5

#

# Copyright 2009 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.

"""Views for GHOP Task Subscription.

"""

__authors__ = [

    '"Madhusudan.C.S" <madhusudancs@gmail.com>'

  ]

from google.appengine.ext import db

from django import http

from soc.logic import dicts

from soc.logic.models import user as user_logic

from soc.views.helper import decorators

from soc.views.models import base

from soc.modules.ghop.logic.models import task as ghop_task_logic

from soc.modules.ghop.logic.models import task_subscription as \

    ghop_task_subscription_logic

from soc.modules.ghop.views.helper import access as ghop_access

import soc.modules.ghop.logic.models.task_subscription

class View(base.View):

  """View methods for the Task Subscriptions.

  """

  def __init__(self, params=None):

    """Defines the fields and methods required for the task_subscription.

    Params:

      params: a dict with params for this View

    """

    rights = ghop_access.GHOPChecker(params)

    rights['subscribe'] = ['checkIsUser']

    new_params = {}

    new_params['logic'] = soc.modules.ghop.logic.models.task_subscription.logic

    new_params['rights'] = rights

    new_params['name'] = "Task Subscription"

    new_params['module_name'] = "task_subscription"

    new_params['module_package'] = 'soc.modules.ghop.views.models'

    new_params['url_name'] = 'ghop/task_subscription'

    patterns = []

    patterns += [

        (r'^%(url_name)s/(?P<access_type>subscribe)$',

        '%(module_package)s.%(module_name)s.subscribe',

        'Subscribe to the %(name)s'),

        ]

    new_params['extra_django_patterns'] = patterns

    params = dicts.merge(params, new_params, sub_merge=True)

    super(View, self).__init__(params=params)

  @decorators.merge_params

  @decorators.check_access

  def subscribe(self, request, access_type, page_name=None,

                params=None, **kwargs):

    """View that subscribes/unsubscribes an user.

    This view is accessed by an AJAX call from task public page.

    Args:

      request: the standard Django HTTP request object

    """

    get_params = request.GET

    task_entity = ghop_task_logic.logic.getFromKeyNameOr404(

        get_params['key_name'])

    user_account = user_logic.logic.getForCurrentAccount()

    entity = params['logic'].getOrCreateTaskSubscriptionForTask(task_entity)

    subscribers = db.get(entity.subscribers)

    # TODO: this should not loop over all subscribers but use GET argument

    remove = False

    for subscriber in subscribers:

      if subscriber.key() == user_account.key():

        remove = True

        break

    if remove:

      subscribers.remove(subscriber)

      data = 'remove'

    else:

      subscribers.append(user_account)

      data = 'add'

    # TODO: missing description for this argument, is it even necessary?

    if not get_params.get('no_toggle'):

      sub_keys = []

      for subscriber in subscribers:

        sub_keys.append(subscriber.key())

      properties = {

          'subscribers': sub_keys,

          }

      ghop_task_subscription_logic.logic.updateEntityProperties(

          entity, properties)

    return http.HttpResponse(data)

view = View()

subscribe = decorators.view(view.subscribe)