package gov.hhs.fha.nhinc.connectmgr.uddi;

import java.util.Timer;

import gov.hhs.fha.nhinc.properties.PropertyAccessor;

import java.util.logging.Level;
import java.util.logging.Logger;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * This class is used to start a timer which when it wakes up will read the UDDI
 * data from the UDDI server, updte the uddiConnectionInfo.xml file with that data,
 * and then tell the ConnectionManager to refresh the UDDI cache with it.
 * 
 * @author Les Westberg
 */
public class UDDITimer extends Thread
{
    private static Log log = LogFactory.getLog(UDDITimer.class);
    private static UDDITimer m_oTheOneAndOnlyTimer = null;
    private static boolean m_bRunnable = false;
    private static final String GATEWAY_PROPERTY_FILE = "gateway";
    private static final String UDDI_REFRESH_DURATION_PROPERTY = "UDDIRefreshDuration";
    private static final int UDDI_REFRESH_DURATION_DEFAULT = 1800;  //(30 minutes)
    
    // private Timer m_oTimer = new Timer(true);           // Timer thread - set up as a daemon.
    private int m_iDurationSeconds = UDDI_REFRESH_DURATION_DEFAULT;


    /**
     * Default constructor
     */
    private UDDITimer()
    {
    }
    
    
    /**
     * This method is used to crete an instance of the UDDITimer.  There should only be exactly
     * one instance of this running at any time.  If it exists, it simply returns the one that
     * exists.  If it does not exist, then it will create it, start the timer, and return a handle to
     * it.  
     * 
     * @throws UDDIAccessorException
     */
    public static void startTimer()
        throws UDDIAccessorException
    {
        m_bRunnable = true;
        
        if (m_oTheOneAndOnlyTimer == null)
        {
            m_oTheOneAndOnlyTimer = new UDDITimer();
            try
            {
                m_oTheOneAndOnlyTimer.initialize();
                m_oTheOneAndOnlyTimer.setDaemon(true);
                m_oTheOneAndOnlyTimer.start();
            }
            catch (Exception e)
            {
                m_oTheOneAndOnlyTimer = null;
                String sErrorMessage = "Failed to start the UDDI Update Manager timer.  Error: " + e.getMessage();
                log.error(sErrorMessage, e);
                throw new UDDIAccessorException(sErrorMessage, e);
            }

            log.info("UDDIUpdateManager timer has just been started now.");
        }
    }
    
    public static void stopTimer()
    {
        m_bRunnable = false;
    }
    
    /**
     * This method starts up the timer.
     */
    private void initialize()
        throws UDDIAccessorException
    {
        
        try
        {
            String sDuration = PropertyAccessor.getProperty(GATEWAY_PROPERTY_FILE, UDDI_REFRESH_DURATION_PROPERTY);
            if ((sDuration != null) && (sDuration.length() > 0))
            {
                m_iDurationSeconds = Integer.parseInt(sDuration);
            }
        }
        catch (Exception e)
        {
            String sErrorMessage = "Failed to read and parse " + UDDI_REFRESH_DURATION_PROPERTY + 
                                   " from " + GATEWAY_PROPERTY_FILE + ".properties file - using default " + "" +
                                   "value of " + UDDI_REFRESH_DURATION_DEFAULT + " seconds.  Error: " +
                                   e.getMessage();
            log.warn(sErrorMessage, e);
        }
        
//        UDDITimerTask oUDDITimerTask = new UDDITimerTask();
//        m_oTimer.schedule(oUDDITimerTask, 0, iDurationSeconds*1000);
        
    }
    
    @Override
    public void run()
    {
        while (m_bRunnable)
        {
            UDDITimerTask oUDDITimerTask = new UDDITimerTask();
            oUDDITimerTask.run();
            try
            {
                log.debug("Before reading properties wait status....");
                Thread.sleep(m_iDurationSeconds * 1000);
                log.debug("Now read properties....");
            } 
            catch (InterruptedException ex)
            {
                log.error("Failed to sleep.", ex);
            }
        }
    }
    
    /**
     * Main method used to test this class.   This one really should not be run under unit
     * test scenarios because it requires access to the UDDI server.
     * 
     * @param args
     */
    public static void main (String[] args)
    {
        System.out.println("Starting test.");
        log.debug("Log: Starting test.");
        
        try
        {
            UDDITimer.startTimer();
            Thread.sleep(70000);   // 1 minutes 10 seconds
        }
        catch (Exception e)
        {
            System.out.println("An unexpected exception occurred: " + e.getMessage());
            e.printStackTrace();
            System.exit(-1);
        }
        
        System.out.println("End of test.");
        
    }
}