/*******************************************************************************
 * Copyright 2011 See AUTHORS file.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/

package com.badlogic.gdx.tests.bullet;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.math.Vector3;
import com.badlogic.gdx.physics.bullet.collision.btCollisionObjectArray;
import com.badlogic.gdx.physics.bullet.dynamics.InternalTickCallback;
import com.badlogic.gdx.physics.bullet.dynamics.btDynamicsWorld;
import com.badlogic.gdx.physics.bullet.dynamics.btRigidBody;

/** @author xoppa */
public class InternalTickTest extends BaseBulletTest {
	static class TestInternalTickCallback extends InternalTickCallback {
		public TestInternalTickCallback (btDynamicsWorld dynamicsWorld) {
			super(dynamicsWorld, true);
		}

		@Override
		public void onInternalTick (btDynamicsWorld dynamicsWorld, float timeStep) {
			btCollisionObjectArray objs = dynamicsWorld.getCollisionObjectArray();
			dynamicsWorld.clearForces();
			int idx = 0;
			for (int i = 0; i < objs.size(); i++) {
				btRigidBody body = (btRigidBody)(objs.at(i));
				if (body == null || body.isStaticOrKinematicObject()) continue;
				body.applyGravity();
				body.applyCentralForce(tmpV1.set(0f, 8.0f + (float)(6.0 * Math.random()), 0f));
				idx++;
			}
		}
	}

	final int BOXCOUNT_X = 5;
	final int BOXCOUNT_Y = 5;
	final int BOXCOUNT_Z = 1;

	final float BOXOFFSET_X = -2.5f;
	final float BOXOFFSET_Y = 0.5f;
	final float BOXOFFSET_Z = 0f;

	TestInternalTickCallback internalTickCallback;

	@Override
	public void create () {
		super.create();

		internalTickCallback = new TestInternalTickCallback((btDynamicsWorld)world.collisionWorld);

		// Create the entities
		world.add("ground", 0f, 0f, 0f).setColor(0.25f + 0.5f * (float)Math.random(), 0.25f + 0.5f * (float)Math.random(),
			0.25f + 0.5f * (float)Math.random(), 1f);

		for (int x = 0; x < BOXCOUNT_X; x++) {
			for (int y = 0; y < BOXCOUNT_Y; y++) {
				for (int z = 0; z < BOXCOUNT_Z; z++) {
					world.add("box", BOXOFFSET_X + x, BOXOFFSET_Y + y, BOXOFFSET_Z + z).setColor(0.5f + 0.5f * (float)Math.random(),
						0.5f + 0.5f * (float)Math.random(), 0.5f + 0.5f * (float)Math.random(), 1f);
				}
			}
		}
	}

	@Override
	public void dispose () {
		super.dispose();

		if (internalTickCallback != null) internalTickCallback.dispose();
		internalTickCallback = null;
	}

	float toggleTime = 0f;
	boolean toggleAttach = false;

	@Override
	public void render () {
		super.render();
		if (internalTickCallback == null) return;
		if ((toggleTime += Gdx.graphics.getDeltaTime()) > 1.0f) {
			toggleTime -= 1.0f;
			if (toggleAttach)
				internalTickCallback.detach();
			else
				internalTickCallback.attach();
			toggleAttach = !toggleAttach;
		}
	}

	@Override
	public boolean tap (float x, float y, int count, int button) {
		shoot(x, y);
		return true;
	}
}