import java.util.Random;

import processing.core.PApplet;
import processing.core.PImage;

// hacked from shiffman (thanks :)

// A simple Particle class, renders the particle as an image
public class Particle {
	Vector3D loc;
	Vector3D vel;
	Vector3D acc;
	
	PImage img[];		  // this particle's texture
	PImage currentImage;
	
	Random generator; // rng
	PApplet p;		  // the parent rendering environment
	
	// other info
	float scale = 1; // the particle's texture scale
	float life = 0;	 // the particle's life
	float timer = 100;  // the particles life timer
	


	// Another constructor (the one we are using here)
	public Particle(PApplet p, Vector3D l, PImage[] img_) {
		
		// need a Vector for initial location
		
		generator = new Random();
		this.p = p;
		
		acc = new Vector3D(0.0F, 0.0F, 0.0F);
		float x = 0;//(float) generator.nextGaussian() * 0.3f;
		float y = 0;// (float) generator.nextGaussian() * 0.3f; - 1.0f;
		
		vel = new Vector3D(x, y, 0);
		loc = l.copy();
		img = img_;
		
		currentImage = img[(int)p.random(0,3)];
		
		// life range
		
		life = p.random(50,100);
		timer = life;
		
		// scale range
		scale = p.random(.6f,1.5f);
		
		
	}

	void run() {
		update();
		render();
	}

	// Method to apply a force vector to the Particle object
	// Note we are ignoring "mass" here
	void add_force(Vector3D f) {
		acc.add(f);
	}

	// Method to update location
	void update() {
		vel.add(acc);
		loc.add(vel);
		timer -= 1;
		acc.setXYZ(0, 0, 0);
	}

	// Method to display
	void render() {

		float lifePercent = PApplet.constrain(timer/(life),0,1); // move to 0,1
		
		p.pushMatrix();
		p.translate( loc.x - currentImage.width / 2, loc.y - currentImage.height / 2);
		p.scale(PApplet.lerp(scale,.1F, lifePercent));
		
		
		float transitionPoint0 = .6f; // the flame / smoke tranistion point
		float transitionPoint1 = .4f; 
		
		int startFireColor = p.color(255,255,0,100);
		int endFireColor = p.color(255,0,0,0);
		int startSmokeColor = p.color(0,0);
		int middleSmokeColor = p.color(50,20);
		int endSmokeColor = startSmokeColor;
		
		
		if(lifePercent >= transitionPoint0) {
			// i made fire!!	// yellow					// red invisible
			p.tint(p.lerpColor(startFireColor,endFireColor, PApplet.norm(lifePercent, 1,transitionPoint0 )));
		} else if (lifePercent >= transitionPoint1) {
			
		//	currentImage = img[3]; // give me smoky textures
			
			// turn into smoke!		//
			p.tint(p.lerpColor(startSmokeColor,middleSmokeColor, PApplet.norm(lifePercent, transitionPoint0,transitionPoint1))); // smoke
		} else {
			// smoke goes away
			p.tint(p.lerpColor(middleSmokeColor,endSmokeColor, PApplet.norm(lifePercent, transitionPoint1,0))); // smoke
		}


		
		
		

		
		
		p.imageMode(PApplet.CORNER);		
		p.image(currentImage,currentImage.width/2,0);
		
		p.popMatrix();
		
	}

	// Is the particle still alive?
	boolean dead() {
		if (timer <= 0.0) {
			return true;
		} else {
			return false;
		}
	}
}