# Copyright 2017 Catalyst IT Limited
#
#    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 qinling.db import api as db_api
from qinling import exceptions as exc
from qinling import status


def create_execution(engine_client, params):
    function_id = params['function_id']
    is_sync = params.get('sync', True)

    with db_api.transaction():
        func_db = db_api.get_function(function_id)
        runtime_db = func_db.runtime
        if runtime_db and runtime_db.status != status.AVAILABLE:
            raise exc.RuntimeNotAvailableException(
                'Runtime %s is not available.' % func_db.runtime_id
            )

        # Increase function invoke count, the updated_at field will be also
        # updated.
        func_db.count = func_db.count + 1

        params.update({'status': status.RUNNING})
        db_model = db_api.create_execution(params)

    engine_client.create_execution(
        db_model.id, function_id, func_db.runtime_id,
        input=params.get('input'), is_sync=is_sync
    )

    if is_sync:
        # The execution should already be updated by engine service for sync
        # execution.
        db_model = db_api.get_execution(db_model.id)

    return db_model