#!/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.

"""This module contains the Work Model."""

__authors__ = [

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

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

]

from google.appengine.ext import db

from django.utils.translation import ugettext_lazy

import polymodel

class Work(polymodel.PolyModel):

  """Model of a Work created by one or more Persons in Roles.

  Work is a "base entity" of other more specific "works" created by Persons

  serving in "roles".

   authors)  a many:many relationship with Roles, stored in a separate

     WorksAuthors model, used to represent authorship of the Work.  See

     the WorksAuthors model class for details.

   reviews)  a 1:many relationship between a Work and the zero or more

     Reviews of that Work.  This relation is implemented as the 'reviews'

     back-reference Query of the Review model 'reviewed' reference.

  """

  #: Required field indicating the "title" of the work, which may have

  #: different uses depending on the specific type of the work. Works

  #: can be indexed, filtered, and sorted by 'title'.

  title = db.StringProperty(required=True,

      verbose_name=ugettext_lazy('Title'))

  title.help_text = ugettext_lazy(

      'title of the document; often used in the window title')

  #: optional, indexed plain text field used for different purposes,

  #: depending on the specific type of the work

  abstract = db.StringProperty(multiline=True)

  abstract.help_text = ugettext_lazy(

      'short abstract, summary, or snippet;'

      ' 500 characters or less, plain text displayed publicly')

  #: Required path, prepended to a "link name" to form the document URL.

  #: The combined path and link name must be globally unique on the

  #: site.  Except in /site/docs (Developer) forms, this field is not

  #: usually directly editable by the User, but is instead set by controller

  #: logic to match the "scope" of the document.

  partial_path = db.StringProperty(required=True,

      verbose_name=ugettext_lazy('Partial path'))

  partial_path.help_text = ugettext_lazy(

    'path portion of URLs, prepended to link name')

  #: Required link name, appended to a "path" to form the document URL.

  #: The combined path and link name must be globally unique on the

  #: site (but, unlike some link names, a Work link name can be reused,

  #: as long as the combination with the preceding path is unique).

  link_name = db.StringProperty(required=True,

      verbose_name=ugettext_lazy('Link name'))

  link_name.help_text = ugettext_lazy('link name used in URLs')

  #: short name used in places such as the sidebar menu and breadcrumb trail

  #: (optional: title will be used if short_name is not present)

  short_name = db.StringProperty(verbose_name=ugettext_lazy('Short name'))

  short_name.help_text = ugettext_lazy(

      'short name used, for example, in the sidebar menu')

  #: date when the work was created

  created = db.DateTimeProperty(auto_now_add=True)

  #: date when the work was last modified

  modified = db.DateTimeProperty(auto_now=True)

  # TODO: some sort of access control preferences are needed at this basic

  #   level.  Works need to be restrict-able to:

  #    * the authors only

  #    * the administrators of the Groups that the authors are in

  #    * any member of the authors' Groups

  #    * logged-in User with a profile

  #    * logged-in Users, but no profile is necessary

  #    * anyone, even those not logged in

  #  (and possibly others)