#!/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.

"""Site-wide Melange home page views.

public: how the general public sees the site home page of a Melange
  site
  
edit: site settings view for logged-in Developers
"""

__authors__ = [
  '"Pawel Solyga" <pawel.solyga@gmail.com>',
  ]


from google.appengine.api import users
from google.appengine.ext import db

from django import forms

from soc.logic import models
from soc.logic import validate
from soc.logic.models import document
from soc.views import helper
from soc.views.helper import access
from soc.views.helper import decorators

import soc.logic.models.site_settings
import soc.models.document
import soc.models.site_settings
import soc.views.helper.forms
import soc.views.helper.responses
import soc.views.helper.templates
import soc.views.helper.widgets
import soc.views.out_of_band


class DocumentForm(helper.forms.DbModelForm):
  content = forms.fields.CharField(widget=helper.widgets.TinyMCE(
      attrs={'rows':10, 'cols':40}))

  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.document.Document
    
    #: list of model fields which will *not* be gathered by the form
    exclude = ['partial_path', 'link_name',
               'author', 'modified', 'created', 'inheritance_line']


class SiteSettingsForm(helper.forms.DbModelForm):
  """Django form displayed when creating or editing Site Settings.
  """
  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.site_settings.SiteSettings

    #: list of model fields which will *not* be gathered by the form
    exclude = ['inheritance_line', 'home']

  def clean_feed_url(self):
    feed_url = self.cleaned_data.get('feed_url')

    if feed_url == '':
      # feed url not supplied (which is OK), so do not try to validate it
      return None
    
    if not validate.isFeedURLValid(feed_url):
      raise forms.ValidationError('This URL is not a valid ATOM or RSS feed.')

    return feed_url


DEF_SITE_HOME_EDIT_TMPL = 'soc/site/settings/edit.html'

@decorators.view
def edit(request, page=None, template=DEF_SITE_HOME_EDIT_TMPL):
  """View for Developer to edit content of Melange site home page.

  Args:
    request: the standard django request object.
    page: a soc.logic.site.page.Page object which is abstraction that combines 
      a Django view with sidebar menu info
    template: the template path to use for rendering the template.

  Returns:
    A subclass of django.http.HttpResponse with generated template.
  """

  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)

  settings_form = None
  document_form = None

  if request.method == 'POST':
    document_form = DocumentForm(request.POST)
    settings_form = SiteSettingsForm(request.POST)

    if document_form.is_valid() and settings_form.is_valid():
      link_name = models.site_settings.logic.DEF_SITE_HOME_DOC_LINK_NAME
      partial_path = models.site_settings.logic.DEF_SITE_SETTINGS_PATH
      logged_in_id = users.get_current_user()
      author = models.user.logic.getFromFields(email=logged_in_id.email())

      properties = {
        'title': document_form.cleaned_data.get('title'),
        'short_name': document_form.cleaned_data.get('short_name'),
        'content': document_form.cleaned_data.get('content'),
        'link_name': link_name,
        'partial_path': partial_path,
        'id': logged_in_id,
        'author': author,
      }

      site_doc = document.logic.updateOrCreateFromFields(
          properties, partial_path=partial_path, link_name=link_name)
      
      feed_url = settings_form.cleaned_data.get('feed_url')

      site_settings = models.site_settings.logic.updateOrCreateFromFields(
          {'feed_url': feed_url, 'home': site_doc},
          path=models.site_settings.logic.DEF_SITE_SETTINGS_PATH)
      
      context['notice'] = 'Site Settings saved.'
  else: # request.method == 'GET'
    # try to fetch SiteSettings entity by unique key_name
    site_settings = models.site_settings.logic.getFromFields(
        path=models.site_settings.logic.DEF_SITE_SETTINGS_PATH)

    if site_settings:
      # populate form with the existing SiteSettings entity
      settings_form = SiteSettingsForm(instance=site_settings)
      
      # check if ReferenceProperty to home Document is valid
      try:
        site_doc = site_settings.home
      except db.Error:
        site_doc = None
    
    else:
      # no SiteSettings entity exists for this key_name, so show a blank form
      settings_form = SiteSettingsForm()
      site_doc = None

    if site_doc:
      # populate form with the existing Document entity
      document_form = DocumentForm(instance=site_doc)
    else:
      # no Document entity exists for this key_name, so show a blank form
      document_form = DocumentForm()
      
  context.update({'document_form': document_form,
                  'settings_form': settings_form })
  
  return helper.responses.respond(request, template, context)