/*******************************************************************************
 * 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.graphics.g3d.particles;

import com.badlogic.gdx.graphics.g3d.Renderable;
import com.badlogic.gdx.graphics.g3d.RenderableProvider;
import com.badlogic.gdx.graphics.g3d.particles.batches.ParticleBatch;
import com.badlogic.gdx.utils.Array;
import com.badlogic.gdx.utils.Pool;

/** Singleton class which manages the particle effects. It's a utility class to ease particle batches management and particle
 * effects update.
 * @author inferno */
public final class ParticleSystem implements RenderableProvider {
	private static ParticleSystem instance;

	/** @deprecated Please directly use the constructor */
	public static ParticleSystem get () {
		if (instance == null) instance = new ParticleSystem();
		return instance;
	}

	private Array<ParticleBatch<?>> batches;
	private Array<ParticleEffect> effects;

	public ParticleSystem () {
		batches = new Array<ParticleBatch<?>>();
		effects = new Array<ParticleEffect>();
	}

	public void add (ParticleBatch<?> batch) {
		batches.add(batch);
	}

	public void add (ParticleEffect effect) {
		effects.add(effect);
	}

	public void remove (ParticleEffect effect) {
		effects.removeValue(effect, true);
	}

	/** Removes all the effects added to the system */
	public void removeAll () {
		effects.clear();
	}

	/** Updates the simulation of all effects */
	public void update () {
		for (ParticleEffect effect : effects) {
			effect.update();
		}
	}

	public void updateAndDraw () {
		for (ParticleEffect effect : effects) {
			effect.update();
			effect.draw();
		}
	}

	/** Must be called one time per frame before any particle effect drawing operation will occur. */
	public void begin () {
		for (ParticleBatch<?> batch : batches)
			batch.begin();
	}

	/** Draws all the particle effects. Call {@link #begin()} before this method and {@link #end()} after. */
	public void draw () {
		for (ParticleEffect effect : effects) {
			effect.draw();
		}
	}

	/** Must be called one time per frame at the end of all drawing operations. */
	public void end () {
		for (ParticleBatch<?> batch : batches)
			batch.end();
	}

	@Override
	public void getRenderables (Array<Renderable> renderables, Pool<Renderable> pool) {
		for (ParticleBatch<?> batch : batches)
			batch.getRenderables(renderables, pool);
	}

	public Array<ParticleBatch<?>> getBatches () {
		return batches;
	}
}