#    Copyright (c) 2013 Mirantis, Inc.
#
#    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.

from webob import exc
from muranoapi.db.models import Session, Environment
from muranoapi.db.session import get_session
from muranoapi.db.services.sessions import SessionServices
from muranoapi.db.services.sessions import SessionState
from muranoapi.db.services.environments import EnvironmentServices
from muranoapi.db.services.environments import EnvironmentStatus
from muranoapi.openstack.common import wsgi
from muranoapi.openstack.common import log as logging

log = logging.getLogger(__name__)


class Controller(object):
    def configure(self, request, environment_id):
        log.debug(_('Session:Configure <EnvId: {0}>'.format(environment_id)))

        unit = get_session()
        environment = unit.query(Environment).get(environment_id)

        if environment is None:
            log.info('Environment <EnvId {0}> is not found'
                     .format(environment_id))
            raise exc.HTTPNotFound

        if environment.tenant_id != request.context.tenant:
            log.info('User is not authorized to access this tenant resources.')
            raise exc.HTTPUnauthorized

        # no new session can be opened if environment has deploying status
        env_status = EnvironmentServices.get_status(environment_id)
        if env_status == EnvironmentStatus.deploying:
            log.info('Could not open session for environment <EnvId: {0}>,'
                     'environment has deploying '
                     'status.'.format(environment_id))
            raise exc.HTTPForbidden()

        user_id = request.context.user
        session = SessionServices.create(environment_id, user_id)

        return session.to_dict()

    def show(self, request, environment_id, session_id):
        log.debug(_('Session:Show <SessionId: {0}>'.format(session_id)))

        unit = get_session()
        session = unit.query(Session).get(session_id)

        if session is None:
            log.error('Session <SessionId {0}> is not found'
                      ''.format(session_id))
            raise exc.HTTPNotFound()

        if session.environment_id != environment_id:
            log.error('Session <SessionId {0}> is not tied with Environment '
                      '<EnvId {1}>'.format(session_id, environment_id))
            raise exc.HTTPNotFound()

        user_id = request.context.user
        if session.user_id != user_id:
            log.error('User <UserId {0}> is not authorized to access '
                      'session <SessionId {1}>.'.format(user_id, session_id))
            raise exc.HTTPUnauthorized()

        if not SessionServices.validate(session):
            log.error('Session <SessionId {0}> is invalid'.format(session_id))
            raise exc.HTTPForbidden()

        return session.to_dict()

    def delete(self, request, environment_id, session_id):
        log.debug(_('Session:Delete <SessionId: {0}>'.format(session_id)))

        unit = get_session()
        session = unit.query(Session).get(session_id)

        if session is None:
            log.error('Session <SessionId {0}> is not found'
                      ''.format(session_id))
            raise exc.HTTPNotFound()

        if session.environment_id != environment_id:
            log.error('Session <SessionId {0}> is not tied with Environment '
                      '<EnvId {1}>'.format(session_id, environment_id))
            raise exc.HTTPNotFound()

        user_id = request.context.user
        if session.user_id != user_id:
            log.error('User <UserId {0}> is not authorized to access '
                      'session <SessionId {1}>.'.format(user_id, session_id))
            raise exc.HTTPUnauthorized()

        if session.state == SessionState.deploying:
            log.error('Session <SessionId: {0}> is in deploying state and '
                      'could not be deleted'.format(session_id))
            raise exc.HTTPForbidden()

        with unit.begin():
            unit.delete(session)

        return None

    def deploy(self, request, environment_id, session_id):
        log.debug(_('Session:Deploy <SessionId: {0}>'.format(session_id)))

        unit = get_session()
        session = unit.query(Session).get(session_id)

        if session is None:
            log.error('Session <SessionId {0}> is not found'
                      ''.format(session_id))
            raise exc.HTTPNotFound()

        if session.environment_id != environment_id:
            log.error('Session <SessionId {0}> is not tied with Environment '
                      '<EnvId {1}>'.format(session_id, environment_id))
            raise exc.HTTPNotFound()

        if not SessionServices.validate(session):
            log.error('Session <SessionId {0}> is invalid'.format(session_id))
            raise exc.HTTPForbidden()

        if session.state != SessionState.open:
            log.error('Session <SessionId {0}> is already deployed or '
                      'deployment is in progress'.format(session_id))
            raise exc.HTTPForbidden()

        SessionServices.deploy(session, unit, request.context.auth_token)


def create_resource():
    return wsgi.Resource(Controller())