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/*
 * $Id$
 * $URL$
 *
 * ====================================================================
 * Ikasan Enterprise Integration Platform
 *
 * Distributed under the Modified BSD License.
 * Copyright notice: The copyright for this software and a full listing
 * of individual contributors are as shown in the packaged copyright.txt
 * file.
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  - Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 *  - Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 *  - Neither the name of the ORGANIZATION nor the names of its contributors may
 *    be used to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 */
package org.ikasan.monitor.notifier;


import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientBuilder;
import javax.ws.rs.client.Entity;
import javax.ws.rs.client.WebTarget;
import javax.ws.rs.core.MediaType;

import org.apache.log4j.Logger;
import org.glassfish.jersey.client.ClientConfig;
import org.ikasan.spec.configuration.PlatformConfigurationService;
import org.ikasan.spec.monitor.Notifier;


/**
 * Ikasan default dashboard notifier implementation.
 *
 * @author Ikasan Development Team
 */
public class DashboardNotifier implements Notifier
{
    /** logger instance */
    private static Logger logger = Logger.getLogger(DashboardNotifier.class);
    
    /** only interested in state changes */
    boolean notifyStateChangesOnly = true;

    /** last update sent time */
    long lastUpdateDateTime;

    /** the base url of the dashboard */
    private String dashboardBaseUrl;
    
    /** the platform configuration service */
    protected PlatformConfigurationService platformConfigurationService;

    @Override
    public void invoke(String environment, String moduleName, String flowName, String state)
    {
    	notify(environment, moduleName, flowName, state);
    }

    @Override
    public void setNotifyStateChangesOnly(boolean notifyStateChangesOnly)
    {
        this.notifyStateChangesOnly = notifyStateChangesOnly;
    }

    @Override
    public boolean isNotifyStateChangesOnly()
    {
        return this.notifyStateChangesOnly;
    }
    
    /**
	 * @return the dashboardBaseUrl
	 */
	public void setDashboardBaseUrl(String dashboardBaseUrl)
	{
		this.dashboardBaseUrl = dashboardBaseUrl;
	}

	
    /**
     * 
     * @param platformConfigurationService
     */
	public void setPlatformConfigurationService(
			PlatformConfigurationService platformConfigurationService)
	{
		this.platformConfigurationService = platformConfigurationService;
	}
	
	/**
	 * @return the dashboardBaseUrl
	 */
	public String getDashboardBaseUrl()
	{
		return dashboardBaseUrl;
	}

	/**
	 * @return the platformConfigurationService
	 */
	public PlatformConfigurationService getPlatformConfigurationService()
	{
		return platformConfigurationService;
	}

	/**
     * Internal notify method
     * 
     * @param environment
     * @param name
     * @param state
     */
    protected void notify(String environment, String moduleName, String flowName, String state)
    {
    	String url = null;
    	
    	try
		{
    		logger.debug("this.platformConfigurationService: " + this.platformConfigurationService);	
    		
    		// We are trying to get the database configuration resource first
    		if(this.platformConfigurationService != null)
    		{	            
	            url = platformConfigurationService.getConfigurationValue("dashboardBaseUrl");
    		}
    		
    		logger.debug("url: " + url);	
    		
    		// If we do not have a database persisted configuration value we will try to get the one from the file system/
    		if((url == null || url.length() == 0) && this.dashboardBaseUrl != null && this.dashboardBaseUrl.length() > 0)
    		{
    			url = this.dashboardBaseUrl;
    		}
    		
    		// Otherwise we'll throw an exception! 
    		if(url == null || url.length() == 0)
    		{
    			throw new RuntimeException("Cannot notify dashboard. The dashboard URL is null or empty string!");
    		}
    		
			url = url + "/rest/topologyCache/updateCache/" + moduleName + "/" + flowName;
			
			logger.debug("Attempting to call URL: " + url);	
		  	
	    	ClientConfig clientConfig = new ClientConfig();
	    	
	    	Client client = ClientBuilder.newClient(clientConfig);
	    	
	    	WebTarget webTarget = client.target(url);
		    
	    	webTarget.request().put(Entity.entity(state, MediaType.APPLICATION_JSON));
		}
		catch(Exception e)
		{			
			throw new RuntimeException("An exception occurred trying to notify the dashboard!", e);
		}
    }
}