#!/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.

"""This module contains the view code for Notifications.

"""

__authors__ = [

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

]

import time

from django import forms

from django.utils.translation import ugettext

from soc.logic import cleaning

from soc.logic import dicts

from soc.logic import validate

from soc.models import notification as notification_model

from soc.views import helper

from soc.views import out_of_band

from soc.views.helper import access

from soc.views.helper import decorators

from soc.views.helper import lists as list_helper

from soc.views.helper import redirects

from soc.views.models import base

from soc.logic.models.notification import logic as notification_logic

from soc.logic.models.user import logic as user_logic

class CreateForm(helper.forms.BaseForm):

  """Form for creating a Notification.

  """

  # to user field

  to_user = forms.fields.CharField(label='To User')

  def __init__(self, *args, **kwargs):

    """ Calls super and then redefines the order in which the fields appear.

    for parameters see BaseForm.__init__()

    """

    super(CreateForm, self).__init__(*args, **kwargs)

    # set form fields order

    self.fields.keyOrder = ['to_user', 'subject', 'message']

  class Meta:

    """Inner Meta class that defines some behavior for the form.

    """

    model = notification_model.Notification

    # exclude the necessary fields from the form

    exclude = ['link_id', 'scope', 'scope_path', 'from_user', 'unread']

  clean_to_user = cleaning.clean_existing_user('to_user')

class View(base.View):

  """View methods for the Notification model.

  """

  def __init__(self, params=None):

    """Defines the fields and methods required for the base View class

    to provide the user with list, public, create, edit and delete views.

    Params:

      params: a dict with params for this View

    """

    rights = access.Checker(params)

    rights['unspecified'] = ['deny']

    rights['edit'] = ['deny']

    rights['show'] = [('checkIsMyEntity', [notification_logic, 'scope_path'])]

    rights['delete'] = [('checkIsMyEntity', [notification_logic, 'scope_path'])]

    rights['list'] = ['checkIsUser']

    # create is developer only for the time being to test functionality

    rights['create'] = ['checkIsDeveloper']

    new_params = {}

    new_params['logic'] = notification_logic

    new_params['rights'] = rights

    new_params['name'] = "Notification"

    new_params['no_create_with_key_fields'] = True

    new_params['create_form'] = CreateForm

    new_params['edit_redirect'] = '/%(url_name)s/list'

    params = dicts.merge(params, new_params)

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

  @decorators.merge_params

  @decorators.check_access

  def list(self, request, access_type,

           page_name=None, params=None, filter=None):

    """Lists all notifications that the current logged in user has stored.

    for parameters see base.list()

    """

    # get the current user

    user_entity = user_logic.getForCurrentAccount()

    # only select the notifications for this user so construct a filter

    filter = {

        'scope': user_entity,

        'unread': True,

        }

    # create the list parameters

    un_params = params.copy() # unread notifications

    # define the list redirect action to show the notification

    un_params['list_action'] = (redirects.getPublicRedirect, params)

    un_params['list_description'] = ugettext(

        "An overview of your unread Notifications.")

    # TODO(Lennard) when list sorting is implemented sort on descending date

    un_list = list_helper.getListContent(

        request, un_params, filter, 0)

    # Now get the read list

    # Reuse the filter, but only for read notifications

    filter['unread'] = False

    rn_params = params.copy() # read notifications

    rn_params['list_action'] = (redirects.getPublicRedirect, params)

    rn_params['list_description'] = ugettext(

        "An overview of your read Notifications.")

    rn_list = list_helper.getListContent(

        request, rn_params, filter, 1)

    # fill contents with all the needed lists

    contents = [un_list, rn_list]

    # call the _list method from base to display the list

    return self._list(request, params, contents, page_name)

  def _editPost(self, request, entity, fields):

    """See base.View._editPost().

    """

    # get the current user

    current_user = user_logic.getForCurrentAccount()

    fields['link_id'] = 't%i' % (time.time())

    fields['scope'] = fields['to_user']

    fields['from_user'] = current_user

    fields['scope_path'] = fields['to_user'].link_id

  def _editSeed(self, request, seed):

    """Checks if scope_path is seeded and puts it into to_user.

    for parameters see base._editSeed()

    """

    # if scope_path is present

    if 'scope_path' in seed.keys():

      # fill the to_user field with the scope path

      seed['to_user'] = seed['scope_path']

  def _public(self, request, entity, context):

    """Marks the Notification as read if that hasn't happened yet.

    for parameters see base._public()

    """

    # if the user viewing is the user for which this notification is meant

    # and the notification has not been read yet

    if entity.unread:

      # get the current user

      user = user_logic.getForCurrentAccount()

      # if the message is meant for the user that is reading it

      if entity.scope.key() == user.key():

        # mark the entity as read

        self._logic.updateEntityProperties(entity, {'unread' : False} )

    context['entity_type_url'] = self._params['url_name']

    context['entity_suffix'] = self._logic.getKeySuffix(entity)

view = View()

create = view.create

edit = view.edit

delete = view.delete

list = view.list

public = view.public

export = view.export