#!/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.

"""Developer views for editing and examining Sponsor profiles.

"""

__authors__ = [

  '"Pawel Solyga" <pawel.solyga@gmail.com>',

  ]

from google.appengine.api import users

from django import http

from django import newforms as forms

import soc.logic

from soc.logic import validate

from soc.logic import out_of_band

from soc.logic.site import id_user

from soc.logic import models

import soc.models.sponsor

from soc.views import helper

from soc.views.helper import access

import soc.views.helper.forms

import soc.views.helper.requests

import soc.views.helper.responses

import soc.views.helper.widgets

from soc.views import simple

from soc.views.user import profile

import soc.views.out_of_band

class CreateForm(helper.forms.DbModelForm):

  """Django form displayed when creating a Sponsor.

  """

  class Meta:

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

    """

    #: db.Model subclass for which the form will gather information

    model = soc.models.sponsor.Sponsor

    #: list of model fields which will *not* be gathered by the form

    exclude = ['founder', 'inheritance_line']

  # TODO(pawel.solyga): write validation functions for other fields

  def clean_link_name(self):

    link_name = self.cleaned_data.get('link_name')

    if not validate.isLinkNameFormatValid(link_name):

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

    if models.sponsor.logic.getFromFields(link_name=link_name):

      raise forms.ValidationError("This link name is already in use.")

    return link_name

class EditForm(CreateForm):

  """Django form displayed when editing a Sponsor.

  """

  link_name = forms.CharField(widget=helper.widgets.ReadOnlyInput())

  def clean_link_name(self):

    link_name = self.cleaned_data.get('link_name')

    if not validate.isLinkNameFormatValid(link_name):

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

    return link_name

DEF_SITE_SPONSOR_PROFILE_EDIT_TMPL = 'soc/site/sponsor/profile/edit.html'

DEF_SPONSOR_NO_LINKNAME_CHANGE_MSG = 'Sponsor link name cannot be changed.'

DEF_CREATE_NEW_SPONSOR_MSG = ' You can create a new sponsor by visiting' \

                          ' <a href="/site/sponsor/profile">Create ' \

                          'a New Sponsor</a> page.'

def edit(request, link_name=None, template=DEF_SITE_SPONSOR_PROFILE_EDIT_TMPL):

  """View for a Developer to modify the properties of a Sponsor Model entity.

  Args:

    request: the standard django request object

    link_name: the Sponsor's site-unique "link_name" extracted from the URL

    template: the "sibling" template (or a search list of such templates)

      from which to construct the public.html template name (or names)

  Returns:

    A subclass of django.http.HttpResponse which either contains the form to

    be filled out, or a redirect to the correct view in the interface.

  """

  try:

    access.checkIsDeveloper(request)

  except  soc.views.out_of_band.AccessViolationResponse, alt_response:

    return alt_response.response()

  # create default template context for use with any templates

  context = helper.responses.getUniversalContext(request)

  logged_in_id = users.get_current_user()

  user = models.user.logic.getFromFields(email=logged_in_id)

  sponsor_form = None

  existing_sponsor = None

  # try to fetch Sponsor entity corresponding to link_name if one exists

  try:

  except out_of_band.ErrorResponse, error:

    # show custom 404 page when link name doesn't exist in Datastore

    error.message = error.message + DEF_CREATE_NEW_SPONSOR_MSG

    return simple.errorResponse(request, error, template, context)

  if request.method == 'POST':

    if existing_sponsor:

      sponsor_form = EditForm(request.POST)

    else:

      sponsor_form = CreateForm(request.POST)

    if sponsor_form.is_valid():

      if link_name:

        # Form doesn't allow to change link_name but somebody might want to

        # abuse that manually, so we check if form link_name is the same as

        # url link_name

        if sponsor_form.cleaned_data.get('link_name') != link_name:

          msg = DEF_SPONSOR_NO_LINKNAME_CHANGE_MSG

          error = out_of_band.ErrorResponse(msg)

          return simple.errorResponse(request, error, template, context)

      fields = {}      

      # Ask for all the fields and pull them out 

      for field in sponsor_form.cleaned_data:

        value = sponsor_form.cleaned_data.get(field)

        fields[field] = value

      fields['founder'] = user

      form_ln = fields['link_name']

      form_sponsor = models.sponsor.logic.updateOrCreateFromFields(fields, link_name=form_ln)

      if not form_sponsor:

        return http.HttpResponseRedirect('/')

      # redirect to new /site/sponsor/profile/form_link_name?s=0

      # (causes 'Profile saved' message to be displayed)

      return helper.responses.redirectToChangedSuffix(

          request, None, form_ln,

          params=profile.SUBMIT_PROFILE_SAVED_PARAMS)

  else: # request.method == 'GET'

    if existing_sponsor:

      # is 'Profile saved' parameter present, but referrer was not ourself?

      # (e.g. someone bookmarked the GET that followed the POST submit) 

      if (request.GET.get(profile.SUBMIT_MSG_PARAM_NAME)

          and (not helper.requests.isReferrerSelf(request, suffix=link_name))):

        # redirect to aggressively remove 'Profile saved' query parameter

        return http.HttpResponseRedirect(request.path)

      # referrer was us, so select which submit message to display

      # (may display no message if ?s=0 parameter is not present)

      context['notice'] = (

          helper.requests.getSingleIndexedParamValue(

              request, profile.SUBMIT_MSG_PARAM_NAME,

              values=profile.SUBMIT_MESSAGES))    

      # populate form with the existing Sponsor entity

      sponsor_form = EditForm(instance=existing_sponsor)

    else:

      if request.GET.get(profile.SUBMIT_MSG_PARAM_NAME):

        # redirect to aggressively remove 'Profile saved' query parameter

        return http.HttpResponseRedirect(request.path)

      # no Sponsor entity exists for this link name, so show a blank form

      sponsor_form = CreateForm()

  context.update({'form': sponsor_form,

                  'existing_group':  existing_sponsor,

                  'group_type': 'Sponsor'})

  return helper.responses.respond(request, template, context)

DEF_SITE_SPONSOR_PROFILE_CREATE_TMPL = 'soc/group/profile/edit.html'

def create(request, template=DEF_SITE_SPONSOR_PROFILE_CREATE_TMPL):

  """create() view is same as edit() view, but with no link_name supplied.

  """

  return edit(request, link_name=None, template=template)

def delete(request, link_name=None, template=DEF_SITE_SPONSOR_PROFILE_EDIT_TMPL):

  """Request handler for a Developer to delete Sponsor Model entity.

  Args:

    request: the standard django request object

    link_name: the Sponsor's site-unique "link_name" extracted from the URL

    template: the "sibling" template (or a search list of such templates)

      from which to construct the public.html template name (or names)

  Returns:

    A subclass of django.http.HttpResponse which redirects 

    to /site/sponsor/list.

  """

  try:

    access.checkIsDeveloper(request)

  except  soc.views.out_of_band.AccessViolationResponse, alt_response:

    return alt_response.response()

  # create default template context for use with any templates

  context = helper.responses.getUniversalContext(request)

  existing_sponsor = None

  # try to fetch Sponsor entity corresponding to link_name if one exists

  try:

    existing_sponsor = models.sponsor.logic.getIfFields(link_name=link_name)

  except out_of_band.ErrorResponse, error:

    # show custom 404 page when link name doesn't exist in Datastore

    error.message = error.message + DEF_CREATE_NEW_SPONSOR_MSG

    return simple.errorResponse(request, error, template, context)

  if existing_sponsor:

    # TODO(pawel.solyga): Create specific delete method for Sponsor model

    # Check if Sponsor can be deleted (has no Hosts and Programs)

    models.sponsor.logic.delete(existing_sponsor)

  return http.HttpResponseRedirect('/site/sponsor/list')