#!/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 Group App.
"""

__authors__ = [
    '"Sverre Rabbelier" <sverre@rabbelier.nl>',
    '"Lennard de Rijk" <ljvderijk@gmail.com>',
  ]


from django import forms
from django import http
from django.utils.translation import ugettext

from soc.logic import accounts
from soc.logic import cleaning
from soc.logic import dicts
from soc.logic.helper import notifications
from soc.logic.models import group_app as group_app_logic
from soc.logic.models import user as user_logic
from soc.views import helper
from soc.views import out_of_band
from soc.views.helper import decorators
from soc.views.helper import lists as list_helper
from soc.views.helper import redirects
from soc.views.helper import responses
from soc.views.helper import widgets
from soc.views.models import base

import soc.logic.models.group_app


DEF_APPLICATION_LIST_DESCRIPTION_FMT = ugettext(
    'Overview of %(name_plural)s which status is %(status)s')


class View(base.View):
  """View methods for the Group App 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'] = soc.logic.models.group_app.logic

    new_params['name'] = "Group Application"
    new_params['name_short'] = "Group App"

    # use the twoline templates for these questionnaires
    new_params['create_template'] = 'soc/models/twoline_edit.html'
    new_params['edit_template'] = 'soc/models/twoline_edit.html'

    patterns = [(r'^%(url_name)s/(?P<access_type>list_self)/%(scope)s$',
        'soc.views.models.%(module_name)s.list_self',
        'List my %(name_plural)s'),
        (r'^%(url_name)s/(?P<access_type>review_overview)/%(scope)s$',
        'soc.views.models.%(module_name)s.review_overview',
        'List of %(name_plural)s for reviewing'),
        (r'^%(url_name)s/(?P<access_type>review)/%(key_fields)s$',
          'soc.views.models.%(module_name)s.review',
          'Review %(name_short)s')]

    new_params['extra_django_patterns'] = patterns

    new_params['extra_dynaexclude'] = ['applicant', 'backup_admin', 'status',
        'created_on', 'last_modified_on']

    new_params['create_extra_dynafields'] = {
        'backup_admin_link_id': widgets.ReferenceField(
              reference_url='user', required=False,
              label=params['logic'].getModel().backup_admin.verbose_name),
        'clean_backup_admin_link_id': 
            cleaning.clean_users_not_same('backup_admin_link_id'),
        }

    new_params['edit_extra_dynafields'] = {
        'clean_link_id' : cleaning.clean_link_id('link_id'),
        }

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

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


  def _editGet(self, request, entity, form):
    """See base.View._editGet().
    """

    if entity.backup_admin:
      form.fields['backup_admin_link_id'].initial = entity.backup_admin.link_id

    super(View, self)._editGet(request, entity, form)

  def _editPost(self, request, entity, fields):
    """See base.View._editPost().
    """

    if not entity:
      # set the applicant field to the current user
      fields['applicant'] = user_logic.logic.getForCurrentAccount()

    #set the backup_admin field with the cleaned link_id
    fields['backup_admin'] = fields['backup_admin_link_id']

    # the application has either been created or edited so
    # the status needs to be set accordingly
    fields['status'] = 'needs review'

    super(View, self)._editPost(request, entity, fields)


  def _public(self, request, entity, context):
    """See base._public().
    """

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

    super(View, self)._public(request, entity, context)


  @decorators.merge_params
  @decorators.check_access
  def list(self, request, access_type,
           page_name=None, params=None, filter={}, **kwargs):
    """Lists all notifications in seperate tables, depending on their status.

    for parameters see base.list()
    """

    # create the selection list
    selection=[('needs review',(redirects.getEditRedirect, params)), 
               ('pre-accepted', (redirects.getEditRedirect, params)),
               ('accepted', (redirects.getEditRedirect, params)),
               ('rejected', (redirects.getEditRedirect, params)),
               ('ignored', (redirects.getEditRedirect, params)),]

    return self._applicationListConstructor(request, params, page_name, 
        filter=filter, selection=selection, **kwargs)


  def _applicationListConstructor(self, request, params, page_name, filter={}, 
                                  selection=[], **kwargs):
    """Constructs the list containing applications for the given the arguments.
    
    Args:
      filter: This is the filter used for all application
      selection: This is a list containing tuples stating the status for an
        application and the redirect action.
      See base.View.public() for the rest.
    
    Returns:
      HTTP Response containing the list view.

    """

    contents = []
    list_params = params.copy()
    index = 0

    for choice in selection:
      # only select the requests that have been pre-accpeted
      filter['status'] = choice[0]

      list_params['list_description'] = (
          DEF_APPLICATION_LIST_DESCRIPTION_FMT % (
          {'name_plural': params['name_plural'], 'status': choice[0]}))
      list_params['list_action'] = choice[1]

      list_content = list_helper.getListContent(
          request, list_params, filter, index)

      contents += [list_content]

      index += 1

    # call the _list method from base to display the list
    if kwargs['context']:
      context = kwargs['context']
    else:
      context = {}

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


  @decorators.merge_params
  @decorators.check_access
  def listSelf(self, request, access_type,
             page_name=None, params=None, **kwargs):
    """List all applications from the current logged-in user.

    For params see base.View.public().
    """

    user_entity = user_logic.logic.getForCurrentAccount()
    filter = {'applicant' : user_entity}

    if kwargs['scope_path']:
      filter['scope_path'] = kwargs['scope_path']

    # create the selection list
    selection=[('needs review',(redirects.getEditRedirect, params)), 
               ('accepted', (redirects.getApplicantRedirect,
                   {'url_name': params['group_url_name']})),
               ('rejected', (redirects.getEditRedirect, params))]

    return self._applicationListConstructor(request, params, page_name,
        filter=filter, selection=selection, **kwargs)

  @decorators.merge_params
  @decorators.check_access
  def review(self, request, access_type,
             page_name=None, params=None, **kwargs):
    """Handles the view containing the review of an application.

    accepted (true or false) in the GET data will mark
    the application accordingly.


    For params see base.View.public().
    """

    # create default template context for use with any templates
    context = responses.getUniversalContext(request)
    context['page_name'] = page_name
    entity = None

    try:
      entity = self._logic.getFromKeyFieldsOr404(kwargs)
    except out_of_band.Error, error:
      return helper.responses.errorResponse(
          error, request, template=params['error_public'], context=context)

    get_dict = request.GET

    # check to see if we can make a decision for this application
    if 'status' in get_dict.keys():
      status_value = get_dict['status']

      if status_value in ['accepted', 'rejected', 'ignored', 'pre-accepted']:
        # this application has been properly reviewed update the status

        # only update if the status changes
        if entity.status != status_value:
          fields = {'status' : status_value}

          self._logic.updateEntityProperties(entity, fields)
          self._review(request, params, entity, status_value, **kwargs)

          if status_value == 'accepted':
            # the application has been accepted send out a notification
            notifications.sendNewGroupNotification(entity, params)

        # redirect to the review overview
        fields = {'url_name': params['url_name']}

        scope_path = entity.scope_path

        if not scope_path:
          scope_path = ''

        # add scope_path to the dictionary
        fields['scope_path'] = scope_path

        return http.HttpResponseRedirect(
            '/%(url_name)s/review_overview/%(scope_path)s' %fields)

    # the application has not been reviewed so show the information
    # using the appropriate review template
    params['public_template'] = params['review_template']

    return super(View, self).public(request, access_type,
        page_name=page_name, params=params, **kwargs)


  def _review(self, request, params, app_entity, status, **kwargs):
    """Does any required post review processing.

    Args:
      request: the standard Django HTTP request object
      params: a dict with params for this View
      app_entity: The update application entity
      status: The status that was given to the reviewed app_entity

    """
    pass


  @decorators.merge_params
  @decorators.check_access
  def reviewOverview(self, request, access_type,
             page_name=None, params=None, **kwargs):
    """Displays multiple lists of applications that are in a different
    status of the application process.
    """

    selection = [('needs review',(redirects.getReviewRedirect, params)),
                 ('accepted', (redirects.getReviewRedirect, params)),
                 ('pre-accepted', (redirects.getReviewRedirect, params)),
                 ('rejected', (redirects.getReviewRedirect, params)),
                 ('ignored', (redirects.getReviewRedirect, params)),]

    filter = {}

    if kwargs['scope_path']:
      filter['scope_path'] = kwargs['scope_path']

    return self._applicationListConstructor(request, params, page_name,
        filter=filter, selection=selection, **kwargs)