#!/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 ProjectSurveys.

"""

__authors__ = [

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

  ]

from soc.logic import dicts

from soc.logic.models.survey import project_logic as project_survey_logic

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

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

from soc.views.helper import redirects

from soc.views.helper import responses

from soc.views.models import survey

class View(survey.View):

  """View methods for the ProjectSurvey 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['any_access'] = ['allow']

    rights['show'] = [('checkIsSurveyReadable', project_survey_logic)]

    rights['create'] = ['checkIsUser']

    rights['edit'] = [('checkIsSurveyWritable', project_survey_logic)]

    rights['delete'] = ['checkIsDeveloper'] # TODO: fix deletion of Surveys

    rights['list'] = ['checkDocumentList']

    rights['results'] = [('checkIsSurveyWritable', project_survey_logic)]

    rights['take'] = [('checkIsSurveyTakeable', project_survey_logic),

                      ('checkIsAllowedToTakeProjectSurveyAs',

                       [project_survey_logic, 'student', 'project'])]

    rights['send_reminder'] = ['checkIsDeveloper'] #TODO: proper access check

    new_params = {}

    new_params['logic'] = project_survey_logic

    new_params['rights'] = rights

    new_params['name'] = "Project Survey"

    new_params['extra_dynaexclude'] = ['taking_access']

    new_params['extra_django_patterns'] = [

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

          'soc.views.models.%(module_name)s.send_reminder',

         'Send Reminder for %(name)s')]

    # used for sending reminders

    new_params['survey_type'] = 'project'

    new_params['reminder_template'] = 'soc/project_survey/reminder.html'

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

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

  @decorators.merge_params

  @decorators.check_access

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

           params=None, **kwargs):

    """View for taking a Survey.

    For Args see base.View().public().

    """

    survey_logic = params['logic']

    try:

      entity = survey_logic.getFromKeyFieldsOr404(kwargs)

    except out_of_band.Error, error:

      return responses.errorResponse(

          error, request, template=params['error_public'])

    get_dict = request.GET

    if not 'project' in get_dict:

      # get the fields needed to filter projects on

      fields = self._constructFilterForProjectSelection(entity, params)

      # show project selection screen using the given filter

      return self._selectProjects(request, page_name, params, entity, fields)

    return super(View, self).take(request, 'any_access', page_name=page_name,

                                  params=params, **kwargs)

  def _getSurveyRecordFor(self, survey, request, params):

    """Returns the SurveyRecord for the given Survey and request.

    This method also take the StudentProject specified as GET param into

    account when querying for the SurveyRecord.

    For params see survey.View._getSurveyRecordFor().

    """

    from soc.logic.models.student_project import logic as student_project_logic

    survey_logic = params['logic']

    record_logic = survey_logic.getRecordLogic()

    # get the StudentProject specified in the GET params

    project_key_name = request.GET['project']

    project_entity = student_project_logic.getFromKeyName(project_key_name)

    filter = {'survey': survey,

              'project': project_entity}

    return record_logic.getForFields(filter, unique=True)

  def _takeGet(self, request, template, context, params, entity, record,

              **kwargs):

    """Hooking into the view for the take's page GET request.

    For params see survey.View._takeGet().

    """

    # the form action should contain the requested project

    context['form_action'] = "?project=%s" %(request.GET['project'])

  def _takePost(self, request, params, entity, record, properties):

    """Hook into the view for the take's page POST request.

    This is used to ensure the right StudentProject gets stored

    For params see survey.View._takePost().

    """

    from soc.logic.models.student_project import logic as student_project_logic

    # retrieve the project using the key name in the GET param

    get_dict = request.GET

    project_entity = student_project_logic.getFromKeyName(get_dict['project'])

    # update the properties that will be stored with the referenced project

    properties.update(project=project_entity, org=project_entity.scope)

  def _constructFilterForProjectSelection(self, survey, params):

    """Returns the filter needed for the Project selection view.

    Returns a filter for all the valid projects for which the current user

    is a student. Of course only in the survey's scope.

    Args:

      survey: a Survey entity

      params: the params dict for the requesting view

    Returns:

      Dictionary that can be used as a input for a query.

    """

    from soc.logic.models.student import logic as student_logic

    survey_logic = params['logic']

    user_entity = user_logic.getForCurrentAccount()

    # get the student entity for the current user and program

    fields = {'user': user_entity,

              'scope': survey_logic.getScope(survey),

              'status': 'active'}

    student_entity = student_logic.getForFields(fields, unique=True)

    # TODO(ljvderijk) transform StudentProject to handle multiple surveys

    fields = {'student': student_entity,

              'status': 'accepted'}

    return fields

  def _selectProjects(self, request, page_name, params, survey, fields):

    """Shows a view upon which a User can select a Student Project to fill in

    the ProjectSurvey for.

    Args:

      survey: a Survey entity

      fields: the filter to use on the Project List

      rest: see base.View.public()

    """

    from soc.views.models.student_project import view as student_project_view

    student_project_params = student_project_view.getParams().copy()

    redirect_dict = {'survey': survey,

                     'params': params}

    student_project_params['list_action'] = (

        redirects.getTakeProjectSurveyRedirect, redirect_dict)

    student_project_params['list_description'] = (

        "Select a %s for which to fill in the %s named %s" %(

            student_project_params['name'], params['name'], survey.title))

    content = lists.getListContent(request, student_project_params, fields)

    contents = [content]

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

  @decorators.merge_params

  @decorators.check_access

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

                   params=None, **kwargs):

    """Starts the task to send out reminders for the Survey given in kwargs.

    For args see base.View.public().

    """

    from google.appengine.api.labs import taskqueue

    from django import http

    survey_logic = params['logic']

    try:

      entity = survey_logic.getFromKeyFieldsOr404(kwargs)

    except out_of_band.Error, error:

      return responses.errorResponse(

          error, request, template=params['error_public'])

    # get the context for this webpage

    context = responses.getUniversalContext(request)

    context['page_name'] = page_name

    if request.POST and request.POST.get('start'):

      # button has been pressed start the task

      task_params = {

          'program_key': survey_logic.getScope(entity).key().id_or_name(),

          'survey_key': entity.key().id_or_name(),

          'survey_type': params['survey_type']}

      task_url = '/tasks/surveys/projects/send_reminder/spawn'

      new_task = taskqueue.Task(params=task_params, url=task_url)

      new_task.add()

      context['message'] = "Task successfully started!"

    template = params['reminder_template']

    return responses.respond(request, template, context)

view = View()

create = decorators.view(view.create)

edit = decorators.view(view.edit)

delete = decorators.view(view.delete)

list = decorators.view(view.list)

public = decorators.view(view.public)

results = decorators.view(view.viewResults)

send_reminder = decorators.view(view.sendReminder)

take = decorators.view(view.take)