import java.lang.reflect.Method;

public class jobThread extends Thread {
	private final int sleepResolution = 20; //Milliseconds
	private long jobTime; //Milliseconds
	private long elapsedTime;
	private boolean isPaused, pauseStateChanged;
	private long startTime;
	private int jobID;
	private boolean jobDone;
	private Method parentAlgorithmDeallocate; //Our parent to notify when we're done.
	private Object parentAlgorithm; //The actual instance of our parent class
	
	/* Fields that we need to know when calling the deallocate */
	private int jobSize;
	private int beginningLocation;
	
	public jobThread(long jobTime, int jobID, int jobSize, int beginningLocation, Method parentAlgorithmDeallocate, Object parentClass){
		this.jobTime = jobTime;
		this.parentAlgorithmDeallocate = parentAlgorithmDeallocate;
		this.parentAlgorithm = parentClass;
		this.elapsedTime = 0;
		this.isPaused = false;
		this.startTime = System.currentTimeMillis();
		this.jobID = jobID;
		this.jobSize = jobSize;
		this.beginningLocation = beginningLocation;
		
		this.jobDone = false;
	}
	
	public void setBeginning(int newBeginning){
		this.beginningLocation = newBeginning;
	}
	
	public void pause(){
		synchronized(this){
			isPaused = true;
			pauseStateChanged = true;
		}
	}
	
	public void jobResume(){
		synchronized(this){
			isPaused = false;
			pauseStateChanged = true;
		}
	}
	
	public void run(){
		//The event loop.
		//Basically, check that elapsedTime plus current time delta
		//are not greater than the time we're supposed to run.
		//If paused, don't do anything until we resume
		try{
			while (!jobDone){
				//Begin event logic
				sleep(sleepResolution);
				
				synchronized(this){
					if (pauseStateChanged){
						if (isPaused){
							//We have just been paused, save the time that we've currently
							//been running, and then go back to the event loop
							elapsedTime += System.currentTimeMillis() - startTime;
							continue;
						} else {
							//We have just been resumed, restart the timer
							startTime = System.currentTimeMillis();
							continue;
						}
					} else {
						if (isPaused){
							//Nothing much happening, we're still paused.
							continue;
						} else {
							//Not paused, Check if we need to keep running
							long currentDelta = System.currentTimeMillis() - startTime;
							if (currentDelta + elapsedTime >= jobTime){
								jobDone = true;
							}
						}
					}
				}
			}
			
			Object[] deallocateArgs = {this.jobSize, this.beginningLocation};
			//We're done, go ahead and notify our algorithm to clean us up
			parentAlgorithmDeallocate.invoke(parentAlgorithm, deallocateArgs);
		} catch (Exception e) {
			return;
		}
	}
}