class GrowingObject{
	
	constructor(){
		this.growing = true;
	}
	
	show(){
		for (let i = 0; i < this.positions.length && this.positions[i + 1] != null; i++){
			let p1 = p5.Vector.add(this.positions[i], this.pos.root);
			let p2 = p5.Vector.add(this.positions[i + 1], this.pos.root);
			strokeWeight((this.positions.length - i) / this.positions.length * this.width);
			line(p1.x, p1.y, p2.x, p2.y);
		}
	}
	
	grow(){
		this.pos.current.add(this.vel);
		this.vel.add(this.acc);
		if (this.positions != null && this.width != null){
			this.positions.push(this.pos.current.copy());
			if (this.width < this.maxWidth) this.width++;
		} else {
			this.radius = this.pos.current.mag();
			if (this.radius > this.maxRadius) this.growing = false;
		}
	}
	
}

class Palm extends GrowingObject{
	
	constructor(x){
		super();
		this.pos = {root: createVector(x, getDesert(x)), current: createVector(0, 0)};
		this.vel = createVector(0, random(-10, -12));
		this.acc = createVector(random(-0.1, 0.1), 0.1);
		this.positions = [this.pos.current.copy()];
		colorMode(HSB);
		this.color = color(35, random(30, 100), 35);
		this.width = 0;
		this.maxWidth = 40;
		this.leaf = [];
		let dispo = random(TWO_PI);
		for (let i = 0; i < 8; i++){
			let root = this.pos.root.copy();
			let direction = i / 4 * PI + dispo;
			this.leaf.push(new Leaf(direction, root));
		}
		this.coconuts = [];
	}
	
	update(){
		let coconutsReady = true;
		stroke(this.color);
		this.show();
		if (this.growing){
			this.grow();
			coconutsReady = false;
		}
		stroke(this.leaf[0].color);
		for (let l of this.leaf){
			if (this.growing) l.update(this.pos);
			else l.update(null);
			if (l.growing) coconutsReady = false;
		}
		if (this.coconuts.length > 0){
			fill(this.coconuts[0].color);
			stroke(0);
		}
		for (let c of this.coconuts) c.update();
		if (abs(this.vel.x) > abs(this.vel.y)) this.growing = false;
		if (coconutsReady && this.coconuts.length == 0) this.createCoconuts();
	}
	
	createCoconuts(){
		let count = int(random(2, 8));
		let dispo = random(TWO_PI);
		for (let i = 0; i < count; i++){
			let root = p5.Vector.add(this.pos.root, this.pos.current);
			let direction = i / (count / 2) * PI + dispo;
			this.coconuts.push(new Coconut(direction, root));
		}
	}
	
}

class Leaf extends GrowingObject{
	
	constructor(direction, root){
		super();
		this.pos = {root: root, current: createVector(0, 0)};
		this.vel = p5.Vector.mult(createVector(p5.Vector.fromAngle(direction).x, p5.Vector.fromAngle(direction).y), 6);
		this.acc = createVector(0, 0.1);
		this.positions = [this.pos.current.copy()];
		colorMode(HSB);
		this.color = color(135, 100, random(50, 80));
		this.width = 0;
		this.maxWidth = 40;
	}
	
	update(pos){
		if (pos != null) this.pos.root.set(p5.Vector.add(pos.root, pos.current).x, p5.Vector.add(pos.root, pos.current).y);
		this.show();
		if (this.growing) this.grow();
		if (this.positions.length > 40) this.growing = false;
	}
	
}

class Coconut extends GrowingObject{
	
	constructor(direction, root){
		super();
		this.pos = {root: root, current: createVector(0, 0)};
		this.vel = p5.Vector.fromAngle(direction);
		this.acc = createVector(0, 0);
		this.radius = 0;
		this.maxRadius = random(10, 20);
		this.color = color("#6c4c2a");
	}
	
	update(){
		if (this.growing) this.grow();
		this.show();
	}
	
	show(){
		let pos = p5.Vector.add(this.pos.root, this.pos.current);
		ellipse(pos.x, pos.y, this.radius * 2);
	}
	
}