/*
 * Copyright 2014 NAVER Corp.
 *
 * 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 com.navercorp.pinpoint.web.batch;

import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.batch.core.Job;
import org.springframework.batch.core.JobExecution;
import org.springframework.batch.core.JobParameters;
import org.springframework.batch.core.configuration.JobLocator;
import org.springframework.batch.core.launch.JobLauncher;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.util.Assert;

/**
 * @author minwoo.jung<minwoo.jung@navercorp.com>
 *
 */
public class JobLaunchSupport implements InitializingBean {

    private final Logger logger = LoggerFactory.getLogger(getClass());

    @Autowired
    private JobLocator locator;
    @Autowired
    private JobLauncher launcher;

    private String batchServerIp;

    public void setBatchServerIp(String batchServerIp) {
        this.batchServerIp = batchServerIp;
    }

    public JobExecution run(String jobName, JobParameters params) {
        if(!decisionBatchServer()) {
            return null;
        }
        try {
            Job    job = locator.getJob(jobName);
            return launcher.run(job, params);
        } catch (Exception e) {
            throw new IllegalStateException(e);
        }
    }

    private boolean decisionBatchServer() {
        Enumeration<NetworkInterface> interfaces;

        try {
            interfaces = NetworkInterface.getNetworkInterfaces();
        } catch (SocketException e) {
            logger.error("not found network interface", e);
            return false;
        }

        while (interfaces.hasMoreElements()) {
            NetworkInterface network = interfaces.nextElement();
            Enumeration<InetAddress> inets = network.getInetAddresses();

            while (inets.hasMoreElements()) {
                InetAddress next = inets.nextElement();

                if (next instanceof Inet4Address) {
                    if (next.getHostAddress().equals(batchServerIp)) {
                        return true;
                    }
                }
            }
        }

        return false;
    }

    @Override
    public void afterPropertiesSet() throws Exception {
        Assert.notNull(locator, "jobLocator name must be provided");
        Assert.notNull(launcher, "jobLauncher name must be provided");
    }
}