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/*
 * Copyright (c) 2022 SAP SE or an SAP affiliate company and Eclipse Dirigible contributors
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v2.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v20.html
 *
 * SPDX-FileCopyrightText: 2022 SAP SE or an SAP affiliate company and Eclipse Dirigible contributors
 * SPDX-License-Identifier: EPL-2.0
 */
package org.eclipse.dirigible.commons.health;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;

import org.eclipse.dirigible.commons.health.HealthStatus.Jobs.JobStatus;
import org.eclipse.dirigible.commons.timeout.TimeLimited;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * The Class HealthStatus.
 */
public class HealthStatus {
	
	/** The Constant logger. */
	private static final Logger logger = LoggerFactory.getLogger(HealthStatus.class);

	/** The Constant INSTANCE. */
	private static final HealthStatus INSTANCE = new HealthStatus();
	
	/** The started. */
	private long started = System.currentTimeMillis();

	/**
	 * Gets the single instance of HealthStatus.
	 *
	 * @return single instance of HealthStatus
	 */
	public static HealthStatus getInstance() {
		if (!INSTANCE.status.equals(Status.Ready) && (System.currentTimeMillis() - INSTANCE.started) > TimeLimited.getTimeoutInMillis()) {
			INSTANCE.status = Status.Ready;
			if (logger.isWarnEnabled()) {logger.warn("Health status: one or more synchronizers still in progress...");}
		}
		return INSTANCE;
	}

	/**
	 * Sets the current status.
	 */
	private static void setCurrentStatus() {
		HealthStatus healthStatus = getInstance();
		healthStatus.currentStatus = Status.Ready;
		for (JobStatus next : healthStatus.getJobs().getJobsStatuses()) {
			if (next.equals(JobStatus.Running)) {
				healthStatus.currentStatus = Status.Running;
				break;
			} else if (next.equals(JobStatus.Failed)) {
				healthStatus.currentStatus = Status.NotReady;
				break;
			}
		}
		if (!healthStatus.status.equals(Status.Ready) && healthStatus.currentStatus.equals(Status.Ready)) {
			healthStatus.status = Status.Ready;
		}
	}

	/**
	 * The Enum Status.
	 */
	public enum Status {
		
		/** The Ready. */
		Ready, 
 /** The Not ready. */
 NotReady, 
 /** The Running. */
 Running
	}

	/** The status. */
	private Status status = Status.NotReady;
	
	/** The current status. */
	private Status currentStatus = Status.NotReady;
	
	/** The jobs. */
	private Jobs jobs = new Jobs();

	/**
	 * Instantiates a new health status.
	 */
	private HealthStatus() {
	
	}

	/**
	 * Gets the status.
	 *
	 * @return the status
	 */
	public Status getStatus() {
		return status;
	}

	/**
	 * Gets the current status.
	 *
	 * @return the current status
	 */
	public Status getCurrentStatus() {
		return currentStatus;
	}

	/**
	 * Gets the jobs.
	 *
	 * @return the jobs
	 */
	public Jobs getJobs() {
		return jobs;
	}


	/**
	 * The Class Jobs.
	 */
	public static class Jobs {
		
		/**
		 * The Enum JobStatus.
		 */
		public enum JobStatus {
			
			/** The Running. */
			Running, 
 /** The Succeeded. */
 Succeeded, 
 /** The Failed. */
 Failed 
		}

		/** The statuses. */
		private Map statuses = new HashMap();


		/**
		 * Gets the statuses.
		 *
		 * @return the statuses
		 */
		public Map getStatuses() {
			return statuses;
		}

		/**
		 * Sets the status.
		 *
		 * @param name the name
		 * @param status the status
		 */
		public void setStatus(String name, JobStatus status) {
			statuses.put(name, status);
			setCurrentStatus();
		}

		/**
		 * Gets the jobs statuses.
		 *
		 * @return the jobs statuses
		 */
		private Collection getJobsStatuses() {
			return statuses.values();
		}

	}
}