package tools;

import java.util.ArrayList;
/*
 *@author Michael Diamond - DigitalGemstones.com
 *@version 1.1.0 (First public release)
 *This class was written by Michael Diamond and DigitalGemstones.com ©2007,2011
 *It is released under the GPL 3.  Details can be found at
 *http://www.DigitalGemstones.com/license.php
 *
 *This class is a self-contained stopwatch for timing operations in seconds in Java.
 *It has all the functionality of a generic stopwatch (Start, Stop, Pause, Resume, Reset, and Duration)
 *Except for time formatting - if you wish for measurments in anything other than seconds, you will need
 *to format the return value of stop() or duration().
 */
public class Timer
{
	private long startTime = 0;
	private long currentDuration = 0;
	private long endTime = 0;
	private boolean paused = false;
	private ArrayList<Double> laps = new ArrayList<Double>();
	
	// Starts the Timer
	public void start()
	{
		startTime = curTime();
		paused = false;
	}
	
	// Stops the Timer and returns the elapsed time since start() in seconds
	public double stop()
	{
		endTime = curTime();
		double returnValue =  ((endTime - startTime) + currentDuration) / 1000.0;
		reset();
		return returnValue;
	}
	
	// Stops the Timer and outputs the elapsed time since start() in seconds, preceded by the output string
	public void stop(String output)
	{
		endTime = System.currentTimeMillis();
		System.out.println(output + ((endTime - startTime) + currentDuration) / 1000.0);
		reset();
	}
	
	// Pauses the Timer
	public void pause()
	{
		if(!paused)
		{
			currentDuration += curTime() - startTime;
			paused = true;
		}
		else
		{
			System.out.println("The Timer is already paused.  Resetting...");
			reset();
		}
	}
	
	// Resumes a paused timer
	public void resume()
	{
		if(paused)
		{
			startTime = curTime();
			paused = false;
		}
		else
		{
			System.out.println("The Timer was not paused.  Resetting...");
			reset();
		}
	}
	
	// Resets the Timer
	public void reset()
	{
		startTime = currentDuration = endTime = 0;
		laps = new ArrayList<Double>();
		paused = false;
	}
	
	// Returns the current value of the Timer
	public double duration()
	{
		if(paused) return currentDuration / 1000.0;
		
		else return (curTime() - startTime + currentDuration) / 1000.0;
	}
	
	// Logs the current time to an array list if not paused
	public void lap(){
		if(!paused)
			laps.add(duration());
	}
	
	// Gets the laps logged by this timer so far
	public ArrayList<Double> getLaps(){
		return new ArrayList<Double>(laps);
	}
	
	// Returns the current time in miliseconds
	public static long curTime()
	{
		return System.currentTimeMillis();
	}
}