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/*
 * Copyright (c) 2017 Baidu, Inc. All Rights Reserve.
 *
 * 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.
 */
package cc.siyecao.uid.worker;

import cc.siyecao.uid.utils.DockerUtils;
import cc.siyecao.uid.utils.NetUtils;
import cc.siyecao.uid.worker.dao.WorkerNodeResposity;
import cc.siyecao.uid.worker.entity.WorkerNodeEntity;
import org.apache.commons.lang3.RandomUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;

/**
 * Represents an implementation of {@link WorkerIdAssigner},
 * the worker id will be discarded after assigned to the UidGenerator
 *
 * @author yutianbao
 */
public class DisposableWorkerIdAssigner implements WorkerIdAssigner {
    private static final Logger LOGGER = LoggerFactory.getLogger( DisposableWorkerIdAssigner.class );

    @Resource
    private WorkerNodeResposity workerNodeResposity;

    /**
     * Assign worker id base on database.
     * If there is host name & port in the environment, we considered that the node runs in Docker container

     * Otherwise, the node runs on an actual machine.
     *
     * @return assigned worker id
     */
    @Override
    @Transactional
    public long assignWorkerId() {
        // build worker node entity
        WorkerNodeEntity workerNodeEntity = buildWorkerNode();

        // add worker node for new (ignore the same IP + PORT)
        workerNodeResposity.addWorkerNode( workerNodeEntity );
        LOGGER.info( "Add worker node:" + workerNodeEntity );

        return workerNodeEntity.getId();
    }

    /**
     * Build worker node entity by IP and PORT
     */
    private WorkerNodeEntity buildWorkerNode() {
        WorkerNodeEntity workerNodeEntity = new WorkerNodeEntity();
        if (DockerUtils.isDocker()) {
            workerNodeEntity.setType( WorkerNodeType.CONTAINER.value() );
            workerNodeEntity.setHostName( DockerUtils.getDockerHost() );
            workerNodeEntity.setPort( DockerUtils.getDockerPort() );

        } else {
            workerNodeEntity.setType( WorkerNodeType.ACTUAL.value() );
            workerNodeEntity.setHostName( NetUtils.getLocalAddress() );
            workerNodeEntity.setPort( System.currentTimeMillis() + "-" + RandomUtils.nextInt( 0, 100000 ) );
        }

        return workerNodeEntity;
    }

}