# copyright 2013-2014 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/>.
"""Official API to access the content of a repository
"""
from logilab.common.deprecation import class_deprecated

from cubicweb.utils import parse_repo_uri
from cubicweb import ConnectionError, AuthenticationError
from cubicweb.server.session import Connection


### private function for specific method ############################

def _get_inmemory_repo(config, vreg=None):
    from cubicweb.server.repository import Repository
    from cubicweb.server.utils import TasksManager
    return Repository(config, TasksManager(), vreg=vreg)


### public API ######################################################

def get_repository(uri=None, config=None, vreg=None):
    """get a repository for the given URI or config/vregistry (in case we're
    loading the repository for a client, eg web server, configuration).

    The returned repository may be an in-memory repository or a proxy object
    using a specific RPC method, depending on the given URI.
    """
    if uri is None:
        return _get_inmemory_repo(config, vreg)

    protocol, hostport, appid = parse_repo_uri(uri)

    if protocol == 'inmemory':
        # me may have been called with a dummy 'inmemory://' uri ...
        return _get_inmemory_repo(config, vreg)

    raise ConnectionError('unknown protocol: `%s`' % protocol)

def connect(repo, login, **kwargs):
    """Take credential and return associated Connection.

    raise AuthenticationError if the credential are invalid."""
    sessionid = repo.connect(login, **kwargs)
    session = repo._get_session(sessionid)
    # XXX the autoclose_session should probably be handle on the session directly
    # this is something to consider once we have proper server side Connection.
    return Connection(session)

def anonymous_cnx(repo):
    """return a Connection for Anonymous user.

    raises an AuthenticationError if anonymous usage is not allowed
    """
    anoninfo = getattr(repo.config, 'anonymous_user', lambda: None)()
    if anoninfo is None: # no anonymous user
        raise AuthenticationError('anonymous access is not authorized')
    anon_login, anon_password = anoninfo
    # use vreg's repository cache
    return connect(repo, anon_login, password=anon_password)


class ClientConnection(Connection):
    __metaclass__ = class_deprecated
    __deprecation_warning__ = '[3.20] %(cls)s is deprecated, use Connection instead'