class ColorPicker {
	
	constructor(){
		this.movingObject = "";
	}
	
	updateFromGraphical(){
		this.h = (1 - $("#hue_picker").position().top / $("#hue").height()) * 360;
		this.s = ($("#sb_picker").position().left + 8) / $("#saturation").width() * 100;
		this.v = (1 - ($("#sb_picker").position().top + 8) / $("#value").height()) * 100;
		
		this.r = HSVtoRGB(this.h, this.s, this.v).r;
		this.g = HSVtoRGB(this.h, this.s, this.v).g;
		this.b = HSVtoRGB(this.h, this.s, this.v).b;
		
		this.hex = RGBtoHEX(this.r, this.g, this.b);
		
		this.updateInterface();
	}
	
	updateFromHSV(){
		this.h = $($("#color_picker_hsv input")[0]).val();
		this.s = $($("#color_picker_hsv input")[1]).val();
		this.v = $($("#color_picker_hsv input")[2]).val();
		
		this.r = HSVtoRGB(this.h, this.s, this.v).r;
		this.g = HSVtoRGB(this.h, this.s, this.v).g;
		this.b = HSVtoRGB(this.h, this.s, this.v).b;
		
		this.hex = RGBtoHEX(this.r, this.g, this.b);
		
		this.updateFromHEX(null, true);
		
		this.updateInterface();
	}
	
	updateFromRGB(){
		this.r = $($("#color_picker_rgb input")[0]).val();
		this.g = $($("#color_picker_rgb input")[1]).val();
		this.b = $($("#color_picker_rgb input")[2]).val();
		
		this.h = RGBtoHSV(this.r, this.g, this.b).h;
		this.s = RGBtoHSV(this.r, this.g, this.b).s;
		this.v = RGBtoHSV(this.r, this.g, this.b).v;
		
		this.hex = RGBtoHEX(this.r, this.g, this.b);
		
		this.updateFromHEX(null, true);
		
		this.updateInterface();
	}
	
	updateFromHEX(input, otf){
		if (!otf){ //Not on the fly
			if ($(input).val().isValidHEX()) this.hex = $(input).val();
			else {
				alert("Error!");
				return;
			}
		}
		
		this.r = HEXtoRGB(this.hex).r;
		this.g = HEXtoRGB(this.hex).g;
		this.b = HEXtoRGB(this.hex).b;
		
		this.h = RGBtoHSV(this.r, this.g, this.b).h;
		this.s = RGBtoHSV(this.r, this.g, this.b).s;
		this.v = RGBtoHSV(this.r, this.g, this.b).v;
		
		this.updateInterface();
	}
	
	updateInterface(){
		
		let r = $($("#color_picker_rgb input")[0]),
			g = $($("#color_picker_rgb input")[1]),
			b = $($("#color_picker_rgb input")[2]),
			h = $($("#color_picker_hsv input")[0]),
			s = $($("#color_picker_hsv input")[1]),
			v = $($("#color_picker_hsv input")[2]),
			hex = $("#color_picker_hex"),
			bgColor;
		
		r.val(round(this.r));
		g.val(round(this.g));
		b.val(round(this.b));
		h.val(round(this.h));
		s.val(round(this.s));
		v.val(round(this.v));
		bgColor = color(this.r, 0, 0);
		r.css({
			"background-color": bgColor.toString(),
			"color": fontColor(bgColor)
		});
		bgColor = color(0, this.g, 0);
		g.css({
			"background-color": bgColor.toString(),
			"color": fontColor(bgColor)
		});
		bgColor = color(0, 0, this.b);
		b.css({
			"background-color": bgColor.toString(),
			"color": fontColor(bgColor)
		});
		colorMode(HSL);
		bgColor = color(this.h, 100, 50);
		h.css({
			"background-color": bgColor.toString(),
			"color": fontColor(bgColor)
		});
		bgColor = color(this.h, this.s, 100 - this.s / 2);
		s.css({
			"background-color": bgColor.toString(),
			"color": fontColor(bgColor)
		});
		bgColor = color(this.h, 100, this.v / 2);
		v.css({
			"background-color": bgColor.toString(),
			"color": fontColor(bgColor)
		});
		colorMode(RGB);
		hex.val(this.hex);
		hex.css({
			"background-color": this.hex,
			"color": fontColor(color(this.hex))
		});
		
		
		let sRGB = HSVtoRGB(this.h, 100, 100);
		let saturationBackground = "linear-gradient(to right, #FFF 0%, rgb(" 
									+ sRGB.r + "," 
									+ sRGB.g + "," 
									+ sRGB.b + ") 100%)";
		$("#hue_picker").css("top", (1 - this.h / 360) * $("#hue").height());
		$("#sb_picker").css({
			"left": this.s / 100 * $("#saturation").width() - 8,
			"top": (1 - this.v / 100) * $("#value").height() - 8
		});
		$("#saturation").css("background", saturationBackground);
		
	}
	
	mousePressed(){
		let x = winMouseX - $("#saturation").offset().left;
		let y = winMouseY - $("#value").offset().top;
		if (x > 0 && x < $("#saturation").width() && y > 0 && y < $("#value").height()){
			this.movingObject = "sb";
		}
		if (x > $("#saturation").width() + 6 && x < $("#saturation").width() + 6 + $("#hue").width() && y > 0 && y < $("#hue").height()){
			this.movingObject = "hue";
		}
		this.mouseDragged();
	}
	
	mouseDragged(){
		if (this.movingObject == "hue"){
			let objH = $("#hue");
			let picker = $("#hue_picker");
			let h = winMouseY - objH.offset().top;
			if (h > 0 && h < objH.height()){
				picker.css("top", h - 1);
			} else if (h > objH.height()){
				picker.css("top", objH.height() - 1);
			} else if (h < 0){
				picker.css("top", -1);
			}
		}
		
		if (this.movingObject == "sb"){
			let objS = $("#saturation");
			let objV = $("#value");
			let picker = $("#sb_picker");
			let s = winMouseX - objS.offset().left;
			let v = winMouseY - objV.offset().top;
			if (s > 0 && s < objS.width()){
				picker.css("left", s - 8);
			} else if (s < 0){
				picker.css("left", -8);
			} else if (s < objS.width()){
				picker.css("left", objS.width() - 8);
			}
			if (v > 0 && v < objV.height()){
				picker.css("top", v - 8);
			} else if (v < 0){
				picker.css("top", -8);
			} else if (v > objV.height()){
				picker.css("top", objV.height() - 8);
			}
		}
		
		this.updateFromGraphical();
	}
	
	mouseReleased(){
		this.movingObject = "";
	}
	
	getColor(){
		return this.hex;
	}
}

function fontColor(bg){
	//http://www.nbdtech.com/Blog/archive/2008/04/27/Calculating-the-Perceived-Brightness-of-a-Color.aspx
	let o = (red(bg) * 299 + green(bg) * 587 + blue(bg) * 114) / 1000;
  	return (o > 125) ? "#000" : "#CCC";
}

//www.stackoverflow.com -->
function RGBtoHEX(r, g, b) {
	let rgb = b | (g << 8) | (r << 16);
    return '#' + (0x1000000 + rgb).toString(16).slice(1);
}

function HEXtoRGB(hex) {
    let shorthandRegex = /^#?([a-fA-F\d])([a-fA-F\d])([a-fA-F\d])$/i;
    hex = hex.replace(shorthandRegex, function(m, r, g, b) {
        return r + r + g + g + b + b;
    });
    let result = /^#?([a-fA-F\d]{2})([a-fA-F\d]{2})([a-fA-F\d]{2})$/i.exec(hex);
    return result ? {
        r: parseInt(result[1], 16),
        g: parseInt(result[2], 16),
        b: parseInt(result[3], 16)
    } : null;
}

function HSVtoRGB(h, s, v) {
    let r, g, b, i, f, p, q, t;
    if (arguments.length === 1) {
        s = h.s, v = h.v, h = h.h;
    }
	h /= 360;
	s /= 100;
	v /= 100;
    i = Math.floor(h * 6);
    f = h * 6 - i;
    p = v * (1 - s);
    q = v * (1 - f * s);
    t = v * (1 - (1 - f) * s);
    switch (i % 6) {
        case 0: r = v, g = t, b = p; break;
        case 1: r = q, g = v, b = p; break;
        case 2: r = p, g = v, b = t; break;
        case 3: r = p, g = q, b = v; break;
        case 4: r = t, g = p, b = v; break;
        case 5: r = v, g = p, b = q; break;
    }
    return {
        r: r * 255,
        g: g * 255,
        b: b * 255
    };
}

function RGBtoHSV(r, g, b) {
    if (arguments.length === 1) {
        g = r.g, b = r.b, r = r.r;
    }
    let max = Math.max(r, g, b), min = Math.min(r, g, b),
        d = max - min,
        h,
        s = (max === 0 ? 0 : d / max),
        v = max / 255;

    switch (max) {
        case min: h = 0; break;
        case r: h = (g - b) + d * (g < b ? 6: 0); h /= 6 * d; break;
        case g: h = (b - r) + d * 2; h /= 6 * d; break;
        case b: h = (r - g) + d * 4; h /= 6 * d; break;
    }

    return {
        h: h * 360,
        s: s * 100,
        v: v * 100
    };
}