#!/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.

"""Views relevant to the User role.

"""

__authors__ = [

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

  ]

import re

from google.appengine.api import users

from django import http

from django import shortcuts

from django import newforms as forms

from soc.views.helpers import forms_helpers

from soc.views.helpers import response_helpers

import soc.models.user

class UserForm(forms_helpers.DbModelForm):

  """Django form displayed when creating or editing a User.

  """

  LINKNAME_PATTERN = r'''(?x)

      ^

      [0-9a-z]  # start with ASCII digit or lowercase

      (

      [0-9a-z]  # additional ASCII digit or lowercase

      |         # -OR-

      _[0-9a-z] # underscore and ASCII digit or lowercase

      )*        # zero or more of OR group

      $'''

  LINKNAME_REGEX = re.compile(LINKNAME_PATTERN)

  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.user.User

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

    exclude = ['id']

  def clean_link_name(self):

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

    linkname_user = soc.models.user.User.getUserForLinkname(linkname)

    current_id = users.get_current_user()

    # if linkname exist in datastore and doesn't belong to current user

    if linkname_user and (linkname_user.id != current_id):

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

    elif not self.LINKNAME_REGEX.match(linkname):

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

    return linkname

def edit(request, linkname=None, template='soc/user/profile/edit.html'):

  """View for a User to modify the properties of a UserModel.

  Args:

    request: the standard django request object.

    linkname: the User's site-unique "linkname" extracted from the URL

    template: the template path to use for rendering the template.

  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.

  """

  #TODO(solydzajs): create controller for User and cleanup code in this handler

  #TODO(solydzajs): use makeSiblingTemplatePath from templates_helpers and pass

  #                 result to public view

  # TODO: use something like the code below, define global public tmpl 

  # template_choices = [makeSiblingTemplatePath(template, 'public.html'),

  # DEF_USER_PROFILE_PUBLIC_TMPL])

  # public(request, linkname=linkname, template=template_choices)

  #: If user not signed and there is no linkname redirect to sign-in page

  #: otherwise show public profile for linkname user

  current_id = users.get_current_user()

  if not current_id and not linkname:

    return http.HttpResponseRedirect(users.create_login_url(request.path))

  elif not current_id and linkname:

    return public(request, linkname)

  user = soc.models.user.User.getUserForId(current_id)

  #: Show custom 404 page when linkname doesn't exist in datastore

  #: or show public view for linkname user

  if linkname:

    linkname_user = soc.models.user.User.getUserForLinkname(linkname)

    if not linkname_user:

      return http.HttpResponseNotFound('No user exists with that link name "%s"' %

                                linkname)

    elif linkname_user and (linkname_user.id != current_id):

      return public(request, linkname)

  #: GET method

  if (request.method != 'POST') and user:

    form = UserForm(initial={'nick_name': user.nick_name,

                             'link_name': user.link_name})

    return response_helpers.respond(request,

        template, {'template': template, 

                   'form': form, 

                   'user': user})

  #: POST method

  form = UserForm()

  if request.method == 'POST':

    form = UserForm(request.POST)

    if form.is_valid():

      linkname = form.cleaned_data.get('link_name')

      nickname = form.cleaned_data.get("nick_name")

      if not user:

        user = soc.models.user.User(id = user,link_name = linkname,

                                        nick_name = nickname)

      else:

        user.nick_name = nickname

        user.link_name = linkname

      user.put()

      return response_helpers.respond(request,

              template, {'template': template, 

                         'form': form, 

                         'user': user,

                         'submit_message': 'Profile saved.'})

  return response_helpers.respond(request,

      template, {'template': template, 'form': form})

def public(request, linkname=None,

           template='soc/user/profile/public.html'):

  """A "general public" view of a User on the site.

  Args:

    request: the standard django request object.

    linkname: the User's site-unique "linkname" extracted from the URL

    template: the template path to use for rendering the template.

  Returns:

    A subclass of django.http.HttpResponse with generated template.

  """

  #: If linkname is empty or not a valid linkname on the site, display

  #: "user does not exist", otherwise render public view for linkname user

  if linkname:

    linkname_user = soc.models.user.User.getUserForLinkname(linkname)

    if not linkname_user:

      return http.HttpResponseNotFound('No user exists with that link name "%s"' %

                                linkname)

    else:

      return response_helpers.respond(request, 

          template, {'template': template,

                     'user': linkname_user})

  return http.HttpResponseNotFound('No user exists with that link name "%s"' %

                            linkname)