/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.flink.runtime.messages.webmonitor;

import org.apache.flink.api.common.JobID;

import java.util.ArrayList;
import java.util.List;

import static org.apache.flink.util.Preconditions.checkNotNull;

/**
 * An overview of how many jobs are in which status.
 */
public class JobsWithIDsOverview implements InfoMessage {

	private static final long serialVersionUID = -3699051943490133183L;
	
	private final List<JobID> jobsRunningOrPending;
	private final List<JobID> jobsFinished;
	private final List<JobID> jobsCancelled;
	private final List<JobID> jobsFailed;

	public JobsWithIDsOverview(List<JobID> jobsRunningOrPending, List<JobID> jobsFinished, 
								List<JobID> jobsCancelled, List<JobID> jobsFailed) {
		
		this.jobsRunningOrPending = checkNotNull(jobsRunningOrPending);
		this.jobsFinished = checkNotNull(jobsFinished);
		this.jobsCancelled = checkNotNull(jobsCancelled);
		this.jobsFailed = checkNotNull(jobsFailed);
	}

	public JobsWithIDsOverview(JobsWithIDsOverview first, JobsWithIDsOverview second) {
		this.jobsRunningOrPending = combine(first.getJobsRunningOrPending(), second.getJobsRunningOrPending());
		this.jobsFinished = combine(first.getJobsFinished(), second.getJobsFinished());
		this.jobsCancelled = combine(first.getJobsCancelled(), second.getJobsCancelled());
		this.jobsFailed = combine(first.getJobsFailed(), second.getJobsFailed());
	}

	public List<JobID> getJobsRunningOrPending() {
		return jobsRunningOrPending;
	}

	public List<JobID> getJobsFinished() {
		return jobsFinished;
	}

	public List<JobID> getJobsCancelled() {
		return jobsCancelled;
	}

	public List<JobID> getJobsFailed() {
		return jobsFailed;
	}
	
	// ------------------------------------------------------------------------


	@Override
	public int hashCode() {
		return jobsRunningOrPending.hashCode() ^
				jobsFinished.hashCode() ^
				jobsCancelled.hashCode() ^
				jobsFailed.hashCode();
	}

	@Override
	public boolean equals(Object obj) {
		if (obj == this) {
			return true;
		}
		else if (obj instanceof JobsWithIDsOverview) {
			JobsWithIDsOverview that = (JobsWithIDsOverview) obj;
			return this.jobsRunningOrPending.equals(that.jobsRunningOrPending) &&
					this.jobsFinished.equals(that.jobsFinished) &&
					this.jobsCancelled.equals(that.jobsCancelled) &&
					this.jobsFailed.equals(that.jobsFailed);
		}
		else {
			return false;
		}
	}

	@Override
	public String toString() {
		return "JobsOverview {" +
				"numJobsRunningOrPending=" + jobsRunningOrPending +
				", numJobsFinished=" + jobsFinished +
				", numJobsCancelled=" + jobsCancelled +
				", numJobsFailed=" + jobsFailed +
				'}';
	}

	// ------------------------------------------------------------------------

	private static ArrayList<JobID> combine(List<JobID> first, List<JobID> second) {
		checkNotNull(first);
		checkNotNull(second);
		ArrayList<JobID> result = new ArrayList<JobID>(first.size() + second.size());
		result.addAll(first);
		result.addAll(second);
		return result;
	}
}