/*
 *  Copyright 2018 the original author or authors.
 *
 *  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 org.springframework.cloud.task.batch.handler;

import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Properties;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.batch.core.ExitStatus;
import org.springframework.batch.core.Job;
import org.springframework.batch.core.JobExecution;
import org.springframework.batch.core.JobExecutionException;
import org.springframework.batch.core.JobParameters;
import org.springframework.batch.core.JobParametersBuilder;
import org.springframework.batch.core.JobParametersInvalidException;
import org.springframework.batch.core.configuration.JobRegistry;
import org.springframework.batch.core.converter.DefaultJobParametersConverter;
import org.springframework.batch.core.converter.JobParametersConverter;
import org.springframework.batch.core.explore.JobExplorer;
import org.springframework.batch.core.launch.JobLauncher;
import org.springframework.batch.core.launch.JobParametersNotFoundException;
import org.springframework.batch.core.launch.NoSuchJobException;
import org.springframework.batch.core.repository.JobExecutionAlreadyRunningException;
import org.springframework.batch.core.repository.JobInstanceAlreadyCompleteException;
import org.springframework.batch.core.repository.JobRestartException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.autoconfigure.batch.JobExecutionEvent;
import org.springframework.cloud.task.listener.TaskException;
import org.springframework.context.ApplicationEventPublisher;
import org.springframework.context.ApplicationEventPublisherAware;
import org.springframework.core.Ordered;
import org.springframework.util.PatternMatchUtils;
import org.springframework.util.StringUtils;

/**
 * {@link CommandLineRunner} to {@link JobLauncher launch} Spring Batch jobs. Runs all
 * jobs in the surrounding context by default and throw an exception upon the
 * first job that returns an {@link ExitStatus} of FAILED.
 * Can also be used to launch a specific job by providing a jobName. The
 * TaskJobLaunchercommandLineRunner takes the place of the
 * {@link org.springframework.boot.autoconfigure.batch.JobLauncherCommandLineRunner}
 * when it is in use.
 *
 * @author Glenn Renfro
 * @since 2.0.0
 */
public class TaskJobLauncherCommandLineRunner implements CommandLineRunner, Ordered, ApplicationEventPublisherAware{
	/**
	 * The default order for the command line runner.
	 */
	public static final int DEFAULT_ORDER = 0;

	private static final Log logger = LogFactory
			.getLog(TaskJobLauncherCommandLineRunner.class);

	private JobParametersConverter converter = new DefaultJobParametersConverter();

	private JobLauncher jobLauncher;

	private JobRegistry jobRegistry;

	private JobExplorer jobExplorer;

	private String jobNames;

	private Collection<Job> jobs = Collections.emptySet();

	private int order = DEFAULT_ORDER;

	private ApplicationEventPublisher publisher;

	public TaskJobLauncherCommandLineRunner(JobLauncher jobLauncher,
			JobExplorer jobExplorer) {
		this.jobLauncher = jobLauncher;
		this.jobExplorer = jobExplorer;
	}

	public void setOrder(int order) {
		this.order = order;
	}

	@Override
	public int getOrder() {
		return this.order;
	}

	@Override
	public void setApplicationEventPublisher(ApplicationEventPublisher publisher) {
		this.publisher = publisher;
	}

	public void setJobRegistry(JobRegistry jobRegistry) {
		this.jobRegistry = jobRegistry;
	}

	public void setJobNames(String jobNames) {
		this.jobNames = jobNames;
	}

	public void setJobParametersConverter(JobParametersConverter converter) {
		this.converter = converter;
	}

	public void setJobs(Collection<Job> jobs) {
		this.jobs = jobs;
	}

	@Override
	public void run(String... args) throws JobExecutionException {
		logger.info("Running default command line with: " + Arrays.asList(args));
		launchJobFromProperties(StringUtils.splitArrayElementsIntoProperties(args, "="));
	}

	protected void launchJobFromProperties(Properties properties)
			throws JobExecutionException {
		JobParameters jobParameters = this.converter.getJobParameters(properties);
		executeLocalJobs(jobParameters);
		executeRegisteredJobs(jobParameters);
	}

	private void executeRegisteredJobs(JobParameters jobParameters)
			throws JobExecutionException {
		if (this.jobRegistry != null && StringUtils.hasText(this.jobNames)) {
			String[] jobsToRun = this.jobNames.split(",");
			for (String jobName : jobsToRun) {
				try {
					Job job = this.jobRegistry.getJob(jobName);
					if (this.jobs.contains(job)) {
						continue;
					}
					execute(job, jobParameters);
				}
				catch (NoSuchJobException ex) {
					logger.debug("No job found in registry for job name: " + jobName);
				}
			}
		}
	}

	protected void execute(Job job, JobParameters jobParameters)
			throws JobExecutionAlreadyRunningException, JobRestartException,
			JobInstanceAlreadyCompleteException, JobParametersInvalidException,
			JobParametersNotFoundException {
		JobParameters nextParameters = new JobParametersBuilder(jobParameters,
				this.jobExplorer).getNextJobParameters(job).toJobParameters();
		JobExecution execution = this.jobLauncher.run(job, nextParameters);
		if (this.publisher != null) {
			this.publisher.publishEvent(new JobExecutionEvent(execution));
		}
		if(execution.getExitStatus().getExitCode().equals(ExitStatus.FAILED.getExitCode())) {
			String message = String.format("Job %s failed during " +
							"execution for jobId %s with jobExecutionId of %s",
					execution.getJobInstance().getJobName(),
					execution.getJobId(), execution.getId());
			logger.error(message);
			throw new TaskException(message);
		}
	}

	private void executeLocalJobs(JobParameters jobParameters)
			throws JobExecutionException {
		for (Job job : this.jobs) {
			if (StringUtils.hasText(this.jobNames)) {
				String[] jobsToRun = this.jobNames.split(",");
				if (!PatternMatchUtils.simpleMatch(jobsToRun, job.getName())) {
					logger.debug("Skipped job: " + job.getName());
					continue;
				}
			}
			execute(job, jobParameters);
		}
	}
}
