"use strict"

class Loader{
	
	constructor(type, title, loadedCallback){
		this.type = type;
		this.title = title;
		this.loadedCallback = loadedCallback;
		this.spinnerAngle = 0;
		$("#menu, #menuOpener").hide();
	}
	
	static Bar(){
		return 0;
	}
	
	static Circle(){
		return 1;
	}
	
	updateProgress(progress, infoText){
		this.progress = progress > 1 ? 1 : progress;
		this.radianAngle = progress * TWO_PI;
		this.strokeWidth = progress * 8 + 2;
		this.infoText = infoText;
	}
	
	update(){
		this.display(this.getColors());
		this.spinnerAngle += PI / 16;
		this.spinnerAngle %= TWO_PI;
		if (this.progress === 1 && this.loadedCallback){
			this.loadedCallback();
		}
	}
	
	display(c){
		background(c.background);
		switch (this.type){
			case Loader.Bar():
				this.bar(c);
				break;
			case Loader.Circle():
				this.circle(c);
				break;
		}
	}
	
	bar(c){
		let w = width * 0.6,
			h = 30;
		let x = (width - w) / 2,
			y = (height - h) / 2;

		this.displayBar(x, y, w, h, c);

		this.displaySpinner(width / 2, height * 3 / 4, 30, c.spinner);

		fill(c.text.fill);
		stroke(c.text.stroke);
		strokeWeight(5);
		textAlign(CENTER, CENTER);

		textSize(height / 32);
		text(str(this.title), width / 2, height / 8);

		strokeWeight(2);
		textSize(h / 2);
		text(str(this.infoText), width / 2, y - h * 1.5);

		strokeWeight(5);
		stroke(c.progress);
		textSize(height / 16);
		text(int(this.progress * 100) + "%", width / 2, height * 5 / 8);
	}
	
	circle(c){
		let size = min(width, height) / 2;
		size = size < 100 ? 100 : size;
		let posX = width / 2;
		let posY = height / 2;

		this.displayCircle(posX, posY, size, c);

		this.displaySpinner(posX, height * 7 / 8, 30, c.spinner);

		fill(c.text.fill);
		stroke(c.text.stroke);
		strokeWeight(5);

		textSize(height / 32);
		text(this.title, posX, height / 8);

		strokeWeight(2);
		textSize(15);
		text(str(this.infoText), width / 2, posY + size / 2 + 30);

		stroke(c.progress);
		strokeWeight(5);
		textSize(height / 16);
		text(str(int(this.progress * 100)) + "%", posX, posY);
	}
	
	displayBar(x, y, w, h, c){
		noFill();
		stroke(0);
		strokeWeight(5);
		rect(x, y, w, h, h / 4);

		w -= (1 - this.progress) * w;

		noStroke();
		fill(c.progress);
		rect(x + 1, y + 1, w - 2 < 0 ? w : w - 2, h - 2, h / 4);
	}
	
	displayCircle(posX, posY, size, c){
		noFill();
		for (let i = 0; i < 3; i++){
			stroke(i == 1 ? c.progress: 0);
			strokeWeight(i == 1 ? 5 : 2);
			if (this.radianAngle < TWO_PI && i == 1){
				arc(posX, posY, size, size, -HALF_PI, this.radianAngle - HALF_PI);
			} else {
				ellipse(posX, posY, size + (i - 1) * 10);
			}
		}
	}
	
	displaySpinner(x, y, r, c){
		let c2 = c;
		colorMode(HSB);
		let c1 = color(hue(c2), saturation(c2), brightness(c2) / 5);
		colorMode(RGB);
		let length = PI + HALF_PI;
		for (let i = this.spinnerAngle; i < this.spinnerAngle + length; i += PI / 16){
			strokeWeight((i - this.spinnerAngle) / length * 10);
			//stroke(lerpColor(c1, c2, (i - this.spinnerAngle) / length));
			stroke(c2);
			let x1 = sin(i) * r + x,
				y1 = cos(i) * r + y,
				x2 = sin(i + PI / 16) * r + x,
				y2 = cos(i + PI / 16) * r + y;
			line(x1, y1, x2, y2);
		}
	}
	
	getColors(){
		return {
			background: color(colors.loader.background),
			progress: color(colors.loader.finished),
			spinner: color(colors.loader.spinner),
			text: {
				fill: color(colors.loader.text.fill),
				stroke: color(colors.loader.text.stroke)
			},
		};
	}
	
	destroy(){
		$("#loader").html("");
		$("#menu, #menuOpener").show();
		loader = null;
	}
	
}

function drawGradient(x, y, w, h, c1, c2, r){
	strokeWeight(1);
	for (let i = x; i <= x + w; i++){
		let inter = map(i, x, x + w, 0, 1);
		let c = lerpColor(c1, c2, inter);
		let b = r - pow(r * r - (i - x - r) * (i - x - r), 0.5);
		b = (i - x > r && i < x + w - r) ? 0 : b;
		b = i > x + w - r ? r - pow(r * r - (i - x - w + r) * (i - x - w + r), 0.5) : b;
		stroke(c);
		line(i, y + b + 1, i, y + h - b - 2);
	}
}