import javax.swing.*;
import java.awt.*;

public class WaitingBar extends JComponent implements Runnable
{
	//pour tester
	public static void main(String[] args){
		JFrame form = new JFrame();
		form.getContentPane().add(new WaitingBar(
				300,
				300,
				Color.LIGHT_GRAY,
				Color.DARK_GRAY,
				9));
		form.setSize(300,300);
		form.setVisible(true);
	}
	
	private static final long serialVersionUID = 1L;

	private boolean isRunning, isDead;
	private int cptr, nbBarres, fps;
	private Color[] tabCouleurs;

	public WaitingBar()
	{
		this(120, 32, Color.WHITE, Color.BLACK, 10);
	}

	public WaitingBar(int width, int height, Color couleurDebut, Color couleurFin, int nbBarres)
	{
		super();

		this.nbBarres = nbBarres;
		this.cptr = 0;
		this.isRunning = false;
		this.isDead = false;
		this.tabCouleurs = new Color[19];
		this.fps = 24;

		this.setCouleurs(couleurDebut, couleurFin);

		this.setSize(width, height);
		this.setOpaque(true);
			
		new Thread(this).start();
		this.startAnim();
	}

	/**
	 * Définit les 2 couleurs entre lesquelles l'animation oscille.
	 * 
	 * @param c1 Couleur de départ pour l'animation.
	 * @param c2 Couleur de fin pour l'animation.
	 */
	public void setCouleurs(Color c1, Color c2){
		double diffR, diffG, diffB;

		diffR = ((double)c1.getRed() - (double)c2.getRed()) / 10;
		diffG = ((double)c1.getGreen() - (double)c2.getGreen()) / 10;
		diffB = ((double)c1.getBlue() - (double)c2.getBlue()) / 10;

		tabCouleurs[0] = tabCouleurs[18] = c1;

		for(int i = 1; i <= 10; i++){
			tabCouleurs[i] = new Color(
					(int)(c1.getRed() - diffR * i),
					(int)(c1.getGreen() - diffG * i),
					(int)(c1.getBlue() - diffB * i));

			tabCouleurs[18 - i] = tabCouleurs[i];
		}

	}

	/**
	 * Démarre l'animation de la WaitingBar.
	 */
	public void startAnim(){
		isRunning = true;
	}

	/**
	 * Arrête l'animation de la WaitingBar.
	 */
	public void stopAnim(){
		isRunning = false;
	}
	
	public void killAnim(){
		isDead = true;
	}

	/**
	 * @return Retourne TRUE si l'animation de la WaitingBar est en train de jouer
	 * ou FALSE si elle est stoppée.
	 */
	public boolean isRunning(){
		return isRunning;
	}

	/**
	 * JComponent.paint(Graphics g)
	 */
	public void paint(Graphics og){
		//TODO: Double-buffering...
		Graphics2D g = (Graphics2D) og;

		g.setColor(Color.BLACK);
		g.fillRect(0,0,getWidth(),getHeight());
		
		//delta en pourcentage
		double delta = 0.03;

		double deltaY = getHeight() * delta;
		double deltaX = getWidth() * delta;
		double rectWidth = getWidth() * (1 - (nbBarres + 1) * delta) / nbBarres;
		double rectHeight = getHeight() * (1 - 2 * delta);

		for(int i = 0; i < nbBarres; i++){
			g.setColor(tabCouleurs[ (int)(cptr + i * 2) % tabCouleurs.length ]);
			g.fillRect(
					(int)(deltaX + (i * (deltaX + rectWidth))),
							(int)deltaY,
							(int)rectWidth,
							(int)rectHeight
					);
		}

		//g.setColor(tabCouleurs[cptr % 19]);
		//g.fillRect(0,0,getWidth(),getHeight());	

	}

	/**
	 * Runnable.run()
	 */
	public void run(){
		while(true && !isDead){
			if(isRunning()){
				repaint();
				cptr++;
			}

			try {
				Thread.sleep(1000 / fps);
			} catch (InterruptedException e) {}
		}
	}


}