/*
 * $RCSfile: Box.java,v $
 *
 * Copyright (c) 2007 Sun Microsystems, Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistribution of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistribution in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in
 *   the documentation and/or other materials provided with the
 *   distribution.
 *
 * Neither the name of Sun Microsystems, Inc. or the names of
 * contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 *
 * This software is provided "AS IS," without a warranty of any
 * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
 * EXCLUDED. SUN MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL
 * NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF
 * USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR
 * ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
 * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
 * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
 * INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 *
 * You acknowledge that this software is not designed, licensed or
 * intended for use in the design, construction, operation or
 * maintenance of any nuclear facility.
 *
 * $Revision: 1.2 $
 * $Date: 2007/02/09 17:21:33 $
 * $State: Exp $
 */

package com.codebynumber.java3d.breakout;

import javax.media.j3d.Appearance;
import javax.media.j3d.Bounds;
import javax.media.j3d.QuadArray;
import javax.media.j3d.Shape3D;
import javax.media.j3d.Transform3D;
import javax.vecmath.Point3d;
import javax.vecmath.Vector3d;
import javax.vecmath.Vector3f;

/**
 * Class to create a box on screen based on given edge sizes.
 * 
 * Box creation source borrowed from Sun (see copyright above). Collision code
 * not part of original source.
 *
 */
public class Box extends Shape3D implements Collidable {

	private QuadArray box;
	private double xmin;
	private double xmax;
	private double ymin;
	private double ymax;
	private double zmin;
	private double zmax;
	/** True if the object should disappear on collision (for bricks) */
	private boolean disappearoncollision = true;

	public void setDissapear(boolean dis) {
		disappearoncollision = dis;
	}
	private Transform3D trans;
	public void setTransform(Transform3D trans) {
		this.trans = trans;
	}

	public Box(double xsize, double ysize, double zsize) {
		super();
		setCapability(Shape3D.ALLOW_COLLIDABLE_WRITE);
		setCapability(Shape3D.ALLOW_GEOMETRY_WRITE);
		xmin = -xsize/2.0;
		xmax = xsize/2.0;
		ymin = -ysize/2.0;
		ymax = ysize/2.0;
		zmin = -zsize/2.0;
		zmax = zsize/2.0;
		box = new QuadArray(24, QuadArray.COORDINATES);
		Point3d verts[] = new Point3d[24];

		// front face
		verts[0] = new Point3d(xmax, ymin, zmax);
		verts[1] = new Point3d(xmax, ymax, zmax);
		verts[2] = new Point3d(xmin, ymax, zmax);
		verts[3] = new Point3d(xmin, ymin, zmax);
		// back face
		verts[4] = new Point3d(xmin, ymin, zmin);
		verts[5] = new Point3d(xmin, ymax, zmin);
		verts[6] = new Point3d(xmax, ymax, zmin);
		verts[7] = new Point3d(xmax, ymin, zmin);
		// right face
		verts[8] = new Point3d(xmax, ymin, zmin);
		verts[9] = new Point3d(xmax, ymax, zmin);
		verts[10] = new Point3d(xmax, ymax, zmax);
		verts[11] = new Point3d(xmax, ymin, zmax);
		// left face
		verts[12] = new Point3d(xmin, ymin, zmax);
		verts[13] = new Point3d(xmin, ymax, zmax);
		verts[14] = new Point3d(xmin, ymax, zmin);
		verts[15] = new Point3d(xmin, ymin, zmin);
		// top face
		verts[16] = new Point3d(xmax, ymax, zmax);
		verts[17] = new Point3d(xmax, ymax, zmin);
		verts[18] = new Point3d(xmin, ymax, zmin);
		verts[19] = new Point3d(xmin, ymax, zmax);
		// bottom face
		verts[20] = new Point3d(xmin, ymin, zmax);
		verts[21] = new Point3d(xmin, ymin, zmin);
		verts[22] = new Point3d(xmax, ymin, zmin);
		verts[23] = new Point3d(xmax, ymin, zmax);

		box.setCoordinates(0, verts);
//		Generate normals (not necessary now)
//		NormalGenerator ng = new NormalGenerator();
//		GeometryInfo gi = new GeometryInfo(box);
//		ng.generateNormals(gi);
		setGeometry(box);
		setAppearance(new Appearance());
	}

	/**
	 * Handles collision of ball (or any object) into this Box.
	 * Attempts to see if ball hit front or back vs. sides, but
	 * only reflects along z axis right now. Still investigating this bug.
	 * @author codebynumber.com
	 */
	public Vector3f doCollision(Bounds bounds) {
		if (trans != null)
		bounds.transform(trans);
		
		//See if vectors from (xmin, 0, zmin) along front edge intersect
		//the bounds of impact.
		Point3d front = new Point3d(this.xmin, 0.0, this.zmin);
		Point3d back = new Point3d(this.xmin, 0.0, this.zmax);
		Point3d rightside = new Point3d(this.xmax, 0.0, this.zmin);
		Point3d leftside = new Point3d(this.xmin, 0.0, this.zmin);
		Vector3f vect;
		Vector3d frontvect = new Vector3d(this.xmax-this.xmin, 0.0, 0.0);
		Vector3d sidevect = new Vector3d(0.0, 0.0, this.zmax-this.zmin);

		if (bounds.intersect(front, frontvect)) {
			vect = new Vector3f(1.0f, 0.0f, -1.0f);
		} else if (bounds.intersect(rightside, sidevect)){
			vect = new Vector3f(-1.0f, 0.0f, 1.0f);
		} else if (bounds.intersect(leftside, sidevect)) {
			vect = new Vector3f(-1.0f, 0.0f, 1.0f);
		} else if (bounds.intersect(back, frontvect)) {
			vect = new Vector3f(-1.0f, 0.0f, 1.0f);
		} else {
//			vect = new Vector3f(1.0f, 0.0f, -1.0f);
			vect = new Vector3f(1.0f, 0.0f, -1.0f);
		}

		if(disappearoncollision) {
			setCollidable(false);
			setGeometry(null);
		}

		return vect;
	}

}