#!/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 google.appengine.api import users

from django import forms

from django import http

from django.utils.translation import ugettext_lazy

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 redirects

from soc.views.models import base

from soc.logic.models import notification as notification_logic

from soc.logic.models import user 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:

    model = notification_model.Notification

    # exclude the necessary fields from the form

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

  def clean_to_user(self):

    """Check if the to_user field has been filled in correctly.

    """

    link_id = self.cleaned_data.get('to_user').lower()

    if not validate.isLinkIdFormatValid(link_id):

      raise forms.ValidationError("This link ID is in wrong format.")

    to_user = user_logic.logic.getForFields({'link_id' : link_id}, unique=True)

    if not to_user:

      # user does not exist

      raise forms.ValidationError("This user does not exist")      

    return link_id

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

    """

    new_params = {}    

    new_params['logic'] = notification_logic.logic

    new_params['name'] = "Notification"

    new_params['name_short'] = "Notification"

    new_params['name_plural'] = "Notifications"

    new_params['url_name'] = "notification"

    new_params['module_name'] = "notification"

    new_params['create_form'] = CreateForm

    # define the django url patterns    

    new_params['django_patterns_defaults'] = [

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

          'soc.views.models.%(module_name)s.public', 'Show %(name_short)s'),

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

          'soc.views.models.%(module_name)s.create', 'Create %(name_short)s'),

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

          'soc.views.models.%(module_name)s.create', 'Create %(name_short)s'),

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

          'soc.views.models.%(module_name)s.delete', 'Delete %(name_short)s'),

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

          'soc.views.models.%(module_name)s.list', 'List %(name_plural)s'),

      ]

    rights = {}

    rights['unspecified'] = [access.deny]

    rights['any_access'] = [access.allow]

    rights['show'] = [access.checkIsMyNotification]

    rights['delete'] = [access.checkIsDeveloper]

    rights['list'] = [access.checkIsUser]

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

    rights['create'] = [access.checkIsDeveloper]

    new_params['rights'] = rights

    params = dicts.merge(params, new_params)

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

  def create(self, request, access_type,

             page_name=None, params=None, **kwargs):

    """On a successful post create redirects the user to the notification list.

    for parameters see base.create()

    """

    if request.method == 'POST':

      response = super(View, self).create(request, access_type,

        page_name, params, **kwargs)

      if (response.__class__ == http.HttpResponseRedirect and

          response['location'].startswith(

              '/%s/edit/' %(self._params['url_name']))):             

        # redirect to list instead of edit view

        return http.HttpResponseRedirect('/%s/list' %(self._params['url_name']))

      else:

        return response

    else: 

      # request.method == 'GET' so act normal 

      return super(View, self).create(request, access_type,

          page_name, params, **kwargs)

  def list(self, request, access_type,

           page_name=None, params=None, seed=None, **kwargs):

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

    for parameters see base.list()

    """

    params = dicts.merge(params, self._params)

    # get the current user

    properties = {'account': users.get_current_user()}

    user_entity = user_logic.logic.getForFields(properties, unique=True)

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

    filter = {'scope': user_entity}

    # create the list parameters

    list_params = params.copy()

    # define the list redirect action to show the notification

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

    list_params['list_description'] = ugettext_lazy(

        "An overview of your received Notifications.")

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

    # use the generic list method with the filter. The access check in this

    # method will trigger an errorResponse when user_entity is None

    return super(View, self).list(request, access_type, 

        page_name, list_params, filter)

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

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

    """

    account = users.get_current_user()

    current_user = user_logic.logic.getForFields({'account': account}, unique=True)

    to_user = user_logic.logic.getForFields(

        {'link_id' : fields['to_user']}, unique=True)

    fields['link_id'] = '%i' %(time.time())

    fields['scope'] = to_user

    fields['from_user'] = current_user

    fields['scope_path'] = fields['to_user']

  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 not entity.has_been_read:

      # get the current user

      account = users.get_current_user()

      user = user_logic.logic.getForFields({'account': account}, unique=True)

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

      # mark the entity as read

        self._logic.updateModelProperties(entity, {'has_been_read' : True} )

    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