#!/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.

"""Generic cleaning methods

"""

__authors__ = [

    '"Todd Larsen" <tlarsen@google.com>',

    '"Sverre Rabbelier" <sverre@rabbelier.nl>',

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

    ]

from django import forms

from soc.logic import validate

from soc.logic.models import user as user_logic

def clean_link_id(self):

  # convert to lowercase for user comfort

  link_id = self.cleaned_data.get('link_id').lower()

  if not validate.isLinkIdFormatValid(link_id):

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

  return link_id

def clean_existing_user(field_name):

  """Check if the field_name field is a valid user.

  """

  def wrapped(self):

    link_id = self.cleaned_data.get(field_name).lower()

    if not validate.isLinkIdFormatValid(link_id):

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

    user_entity = user_logic.logic.getForFields({'link_id' : link_id}, unique=True)

    if not user_entity:

      # user does not exist

      raise forms.ValidationError("This user does not exist.")

    return user_entity

  return wrapped

def clean_users_not_same(field_name):

  """Check if the field_name field is a valid user and is not 

     equal to the current user.

  """

  def wrapped(self):

    clean_user_field = clean_existing_user(field_name)

    user_entity = clean_user_field(self)

    current_user_entity = user_logic.logic.getForCurrentAccount()

    if user_entity.key() == current_user_entity.key():

      # users are equal

      raise forms.ValidationError("You cannot enter yourself here")

    return user_entity

  return wrapped

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 clean_url(field_name):

  """Clean method for cleaning a field belonging to a LinkProperty.

  """

  def wrapped(self):

    value = self.cleaned_data.get(field_name)

    # LinkProperty does not accept the empty string so we must return None

    if not value or value == u'':

      return None

    # call the Django URLField cleaning method to properly clean/validate this field

    return forms.URLField.clean(self, value)

  return wrapped