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

public class WaitingBar extends JComponent implements Runnable
{
	private static final long serialVersionUID = 1L;
	
	private boolean isRunning;
	private int cptr;
	private Color[] tabCouleurs;
	
	public WaitingBar()
	{
		this(120, 32);
	}
	
	public WaitingBar(int width, int height)
	{
		super();
		
		this.cptr = 0;
		this.isRunning = false;
		this.tabCouleurs = new Color[19];
		
		this.setCouleurs(Color.WHITE, Color.BLACK);

		this.setSize(width, height);
		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] = 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[19 - 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;
	}
	
	/**
	 * @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;
		
		//TODO: Afficher 5 carrées...
		
		/*
		 * nbCarres = 5;
		 * 
		 * double deltaY = getHeight() * 0.02;
		 * double deltaX = getWidth() * 0.03;
		 * double rectWidth = getWidth() * 0.82 / 5;
		 * double rectHeight = getHeight() * 0.96;
		 * 
		 * for(int i = 0; i < 5; i++){
		 *		g.setColor(tabCouleur[ (cptr + i * 2) % tabCouleurs.length ]);
		 *		g.fillRect(
		 *				x = deltaX + (i * (deltaX + rectWidth),
		 *				y = deltaY,
		 *				width = rectWidth,
		 *				height = rectHeight
		 *		);
		 * }
		 *
		 */
		
		g.setColor(tabCouleurs[cptr % 19]);
		g.fillRect(0,0,getWidth(),getHeight());	

	}
	
	/**
	 * Runnable.run()
	 */
	public void run(){
		while(true){
			if(isRunning()){
				repaint();
				cptr++;
			}
			
			try {
				Thread.sleep(1000 / 12);
			} catch (InterruptedException e) {}
		}		
	}
	
	
}