# copyright 2003-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.

# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr

#

# This file is part of CubicWeb.

#

# CubicWeb is free software: you can redistribute it and/or modify it under the

# terms of the GNU Lesser General Public License as published by the Free

# Software Foundation, either version 2.1 of the License, or (at your option)

# any later version.

#

# CubicWeb is distributed in the hope that it will be useful, but WITHOUT

# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS

# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more

# details.

#

# You should have received a copy of the GNU Lesser General Public License along

# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.

"""google appengine configuration

"""

__docformat__ = "restructuredtext en"

import os

from os.path import join

from cubicweb import CW_SOFTWARE_ROOT

from cubicweb.cwconfig import CubicWebConfiguration

from cubicweb.web.webconfig import WebConfiguration, merge_options

from cubicweb.server.serverconfig import ServerConfiguration

from cubicweb.goa.dbmyams import load_schema

UNSUPPORTED_OPTIONS = set(('connections-pool-size',

                           'pyro-host', 'pyro-instance-id',

                           'pyro-ns-host', 'pyro-ns-group',

                           'https-url', 'host', 'pid-file', 'uid', 'base-url', 'log-file',

                           'smtp-host', 'smtp-port',

                           'embed-allowed',

                           ))

# XXX fix:

# * default sender-name / sender-addr value

# * what about *session-time

# * check auth-mode=http + fix doc (eg require use-google-auth = False)

class GAEConfiguration(ServerConfiguration, WebConfiguration):

    """repository and web instance in Google AppEngine environment"""

    name = 'app'

    repo_method = 'inmemory'

    options = merge_options((

        ('included-cubes',

         {'type' : 'csv',

          'default': [],

          'help': 'list of db model based cubes used by the instance.',

          'group': 'main', 'level': 1,

          }),

        ('included-yams-cubes',

         {'type' : 'csv',

          'default': [],

          'help': 'list of yams based cubes used by the instance.',

          'group': 'main', 'level': 1,

          }),

        ('use-google-auth',

         {'type' : 'yn',

          'default': True,

          'help': 'does this instance rely on google authentication service or not.',

          'group': 'main', 'level': 1,

          }),

        ('schema-type',

         {'type' : 'choice', 'choices': ('yams', 'dbmodel'),

          'default': 'yams',

          'help': 'does this instance is defining its schema using yams or db model.',

          'group': 'main', 'level': 1,

          }),

        # overriden options

        ('query-log-file',

         {'type' : 'string',

          'default': None,

          'help': 'web instance query log file: DON\'T SET A VALUE HERE WHEN '

          'UPLOADING YOUR INSTANCE. This should only be used to analyse '

          'queries issued by your instance in the development environment.',

          'group': 'main', 'level': 2,

          }),

        ('anonymous-user',

         {'type' : 'string',

          'default': None,

          'help': 'login of the CubicWeb user account to use for anonymous user '

          '(if you want to allow anonymous). This option will be ignored if '

          'use-google-auth option is set (in which case you should control '

          'anonymous access using the app.yaml file)',

          'group': 'main', 'level': 1,

          }),

        ) + WebConfiguration.options + ServerConfiguration.options)

    options = [(optname, optdict) for optname, optdict in options

               if not optname in UNSUPPORTED_OPTIONS]

    cubicweb_appobject_path = WebConfiguration.cubicweb_appobject_path | ServerConfiguration.cubicweb_appobject_path

    cubicweb_appobject_path = list(cubicweb_appobject_path) + ['goa/appobjects']

    cube_appobject_path = WebConfiguration.cube_appobject_path | ServerConfiguration.cube_appobject_path

    # use file system schema

    read_instance_schema = False

    # schema is not persistent, don't load schema hooks (unavailable)

    schema_hooks = False

    # no user workflow for now

    consider_user_state = False

    # deactivate some hooks during [pre|post]create scripts execution

    # (unique values check, owned_by/created_by relations setup)

    free_wheel = True

    if not os.environ.get('APYCOT_ROOT'):

        CUBES_DIR = join(CW_SOFTWARE_ROOT, '../cubes')

    def __init__(self, appid, apphome=None):

        if apphome is None:

            apphome = 'data'

        self._apphome = apphome

        self._base_url = None

        CubicWebConfiguration.__init__(self, appid)

    def __getitem__(self, key):

        if key == 'connections-pool-size':

            return 4 # > 1 to allow multiple user sessions in tests

        if key == 'base-url':

            return self._base_url

        return super(GAEConfiguration, self).__getitem__(key)

    # overriden from cubicweb base configuration

    @property

    def apphome(self):

        return self._apphome

    def cubes(self):

        """return the list of top level cubes used by this instance (eg

        without dependencies)

        """

        if self._cubes is None:

            cubes = self['included-cubes'] + self['included-yams-cubes']

            cubes = self.expand_cubes(cubes)

            return self.reorder_cubes(cubes)

        return self._cubes

    def vc_config(self):

        """return CubicWeb's engine and instance's cube versions number"""

        return {}

    # overriden from cubicweb web configuration

    def instance_md5_version(self):

        return ''

    def _init_base_url(self):

        pass

    # overriden from cubicweb server configuration

    def sources(self):

        return {'system': {'adapter': 'gae'}}

    def load_schema(self, schemaclasses=None, extrahook=None):

        try:

            return self._schema

        except AttributeError:

            self._schema = load_schema(self, schemaclasses, extrahook)

            return self._schema

    # goa specific

    def repo_session(self, sessionid):

        return self.repository()._sessions[sessionid]

    def is_anonymous_user(self, login):

        if self['use-google-auth']:

            from google.appengine.api import users

            return users.get_current_user() is None

        else:

            return login == self.anonymous_user()[0]