'use strict';

var conversions = require('../../_virtual/conversions.js');
var index = require('./node_modules/color-name/index.js');

/* MIT license */

var hasRequiredConversions;

function requireConversions () {
	if (hasRequiredConversions) return conversions.__module.exports;
	hasRequiredConversions = 1;
	var cssKeywords = index.__require();

	// NOTE: conversions should only return primitive values (i.e. arrays, or
	//       values that give correct `typeof` results).
	//       do not use box values types (i.e. Number(), String(), etc.)

	var reverseKeywords = {};
	for (var key in cssKeywords) {
		if (cssKeywords.hasOwnProperty(key)) {
			reverseKeywords[cssKeywords[key]] = key;
		}
	}

	var convert = conversions.__module.exports = {
		rgb: {channels: 3, labels: 'rgb'},
		hsl: {channels: 3, labels: 'hsl'},
		hsv: {channels: 3, labels: 'hsv'},
		hwb: {channels: 3, labels: 'hwb'},
		cmyk: {channels: 4, labels: 'cmyk'},
		xyz: {channels: 3, labels: 'xyz'},
		lab: {channels: 3, labels: 'lab'},
		lch: {channels: 3, labels: 'lch'},
		hex: {channels: 1, labels: ['hex']},
		keyword: {channels: 1, labels: ['keyword']},
		ansi16: {channels: 1, labels: ['ansi16']},
		ansi256: {channels: 1, labels: ['ansi256']},
		hcg: {channels: 3, labels: ['h', 'c', 'g']},
		apple: {channels: 3, labels: ['r16', 'g16', 'b16']},
		gray: {channels: 1, labels: ['gray']}
	};

	// hide .channels and .labels properties
	for (var model in convert) {
		if (convert.hasOwnProperty(model)) {
			if (!('channels' in convert[model])) {
				throw new Error('missing channels property: ' + model);
			}

			if (!('labels' in convert[model])) {
				throw new Error('missing channel labels property: ' + model);
			}

			if (convert[model].labels.length !== convert[model].channels) {
				throw new Error('channel and label counts mismatch: ' + model);
			}

			var channels = convert[model].channels;
			var labels = convert[model].labels;
			delete convert[model].channels;
			delete convert[model].labels;
			Object.defineProperty(convert[model], 'channels', {value: channels});
			Object.defineProperty(convert[model], 'labels', {value: labels});
		}
	}

	convert.rgb.hsl = function (rgb) {
		var r = rgb[0] / 255;
		var g = rgb[1] / 255;
		var b = rgb[2] / 255;
		var min = Math.min(r, g, b);
		var max = Math.max(r, g, b);
		var delta = max - min;
		var h;
		var s;
		var l;

		if (max === min) {
			h = 0;
		} else if (r === max) {
			h = (g - b) / delta;
		} else if (g === max) {
			h = 2 + (b - r) / delta;
		} else if (b === max) {
			h = 4 + (r - g) / delta;
		}

		h = Math.min(h * 60, 360);

		if (h < 0) {
			h += 360;
		}

		l = (min + max) / 2;

		if (max === min) {
			s = 0;
		} else if (l <= 0.5) {
			s = delta / (max + min);
		} else {
			s = delta / (2 - max - min);
		}

		return [h, s * 100, l * 100];
	};

	convert.rgb.hsv = function (rgb) {
		var rdif;
		var gdif;
		var bdif;
		var h;
		var s;

		var r = rgb[0] / 255;
		var g = rgb[1] / 255;
		var b = rgb[2] / 255;
		var v = Math.max(r, g, b);
		var diff = v - Math.min(r, g, b);
		var diffc = function (c) {
			return (v - c) / 6 / diff + 1 / 2;
		};

		if (diff === 0) {
			h = s = 0;
		} else {
			s = diff / v;
			rdif = diffc(r);
			gdif = diffc(g);
			bdif = diffc(b);

			if (r === v) {
				h = bdif - gdif;
			} else if (g === v) {
				h = (1 / 3) + rdif - bdif;
			} else if (b === v) {
				h = (2 / 3) + gdif - rdif;
			}
			if (h < 0) {
				h += 1;
			} else if (h > 1) {
				h -= 1;
			}
		}

		return [
			h * 360,
			s * 100,
			v * 100
		];
	};

	convert.rgb.hwb = function (rgb) {
		var r = rgb[0];
		var g = rgb[1];
		var b = rgb[2];
		var h = convert.rgb.hsl(rgb)[0];
		var w = 1 / 255 * Math.min(r, Math.min(g, b));

		b = 1 - 1 / 255 * Math.max(r, Math.max(g, b));

		return [h, w * 100, b * 100];
	};

	convert.rgb.cmyk = function (rgb) {
		var r = rgb[0] / 255;
		var g = rgb[1] / 255;
		var b = rgb[2] / 255;
		var c;
		var m;
		var y;
		var k;

		k = Math.min(1 - r, 1 - g, 1 - b);
		c = (1 - r - k) / (1 - k) || 0;
		m = (1 - g - k) / (1 - k) || 0;
		y = (1 - b - k) / (1 - k) || 0;

		return [c * 100, m * 100, y * 100, k * 100];
	};

	/**
	 * See https://en.m.wikipedia.org/wiki/Euclidean_distance#Squared_Euclidean_distance
	 * */
	function comparativeDistance(x, y) {
		return (
			Math.pow(x[0] - y[0], 2) +
			Math.pow(x[1] - y[1], 2) +
			Math.pow(x[2] - y[2], 2)
		);
	}

	convert.rgb.keyword = function (rgb) {
		var reversed = reverseKeywords[rgb];
		if (reversed) {
			return reversed;
		}

		var currentClosestDistance = Infinity;
		var currentClosestKeyword;

		for (var keyword in cssKeywords) {
			if (cssKeywords.hasOwnProperty(keyword)) {
				var value = cssKeywords[keyword];

				// Compute comparative distance
				var distance = comparativeDistance(rgb, value);

				// Check if its less, if so set as closest
				if (distance < currentClosestDistance) {
					currentClosestDistance = distance;
					currentClosestKeyword = keyword;
				}
			}
		}

		return currentClosestKeyword;
	};

	convert.keyword.rgb = function (keyword) {
		return cssKeywords[keyword];
	};

	convert.rgb.xyz = function (rgb) {
		var r = rgb[0] / 255;
		var g = rgb[1] / 255;
		var b = rgb[2] / 255;

		// assume sRGB
		r = r > 0.04045 ? Math.pow(((r + 0.055) / 1.055), 2.4) : (r / 12.92);
		g = g > 0.04045 ? Math.pow(((g + 0.055) / 1.055), 2.4) : (g / 12.92);
		b = b > 0.04045 ? Math.pow(((b + 0.055) / 1.055), 2.4) : (b / 12.92);

		var x = (r * 0.4124) + (g * 0.3576) + (b * 0.1805);
		var y = (r * 0.2126) + (g * 0.7152) + (b * 0.0722);
		var z = (r * 0.0193) + (g * 0.1192) + (b * 0.9505);

		return [x * 100, y * 100, z * 100];
	};

	convert.rgb.lab = function (rgb) {
		var xyz = convert.rgb.xyz(rgb);
		var x = xyz[0];
		var y = xyz[1];
		var z = xyz[2];
		var l;
		var a;
		var b;

		x /= 95.047;
		y /= 100;
		z /= 108.883;

		x = x > 0.008856 ? Math.pow(x, 1 / 3) : (7.787 * x) + (16 / 116);
		y = y > 0.008856 ? Math.pow(y, 1 / 3) : (7.787 * y) + (16 / 116);
		z = z > 0.008856 ? Math.pow(z, 1 / 3) : (7.787 * z) + (16 / 116);

		l = (116 * y) - 16;
		a = 500 * (x - y);
		b = 200 * (y - z);

		return [l, a, b];
	};

	convert.hsl.rgb = function (hsl) {
		var h = hsl[0] / 360;
		var s = hsl[1] / 100;
		var l = hsl[2] / 100;
		var t1;
		var t2;
		var t3;
		var rgb;
		var val;

		if (s === 0) {
			val = l * 255;
			return [val, val, val];
		}

		if (l < 0.5) {
			t2 = l * (1 + s);
		} else {
			t2 = l + s - l * s;
		}

		t1 = 2 * l - t2;

		rgb = [0, 0, 0];
		for (var i = 0; i < 3; i++) {
			t3 = h + 1 / 3 * -(i - 1);
			if (t3 < 0) {
				t3++;
			}
			if (t3 > 1) {
				t3--;
			}

			if (6 * t3 < 1) {
				val = t1 + (t2 - t1) * 6 * t3;
			} else if (2 * t3 < 1) {
				val = t2;
			} else if (3 * t3 < 2) {
				val = t1 + (t2 - t1) * (2 / 3 - t3) * 6;
			} else {
				val = t1;
			}

			rgb[i] = val * 255;
		}

		return rgb;
	};

	convert.hsl.hsv = function (hsl) {
		var h = hsl[0];
		var s = hsl[1] / 100;
		var l = hsl[2] / 100;
		var smin = s;
		var lmin = Math.max(l, 0.01);
		var sv;
		var v;

		l *= 2;
		s *= (l <= 1) ? l : 2 - l;
		smin *= lmin <= 1 ? lmin : 2 - lmin;
		v = (l + s) / 2;
		sv = l === 0 ? (2 * smin) / (lmin + smin) : (2 * s) / (l + s);

		return [h, sv * 100, v * 100];
	};

	convert.hsv.rgb = function (hsv) {
		var h = hsv[0] / 60;
		var s = hsv[1] / 100;
		var v = hsv[2] / 100;
		var hi = Math.floor(h) % 6;

		var f = h - Math.floor(h);
		var p = 255 * v * (1 - s);
		var q = 255 * v * (1 - (s * f));
		var t = 255 * v * (1 - (s * (1 - f)));
		v *= 255;

		switch (hi) {
			case 0:
				return [v, t, p];
			case 1:
				return [q, v, p];
			case 2:
				return [p, v, t];
			case 3:
				return [p, q, v];
			case 4:
				return [t, p, v];
			case 5:
				return [v, p, q];
		}
	};

	convert.hsv.hsl = function (hsv) {
		var h = hsv[0];
		var s = hsv[1] / 100;
		var v = hsv[2] / 100;
		var vmin = Math.max(v, 0.01);
		var lmin;
		var sl;
		var l;

		l = (2 - s) * v;
		lmin = (2 - s) * vmin;
		sl = s * vmin;
		sl /= (lmin <= 1) ? lmin : 2 - lmin;
		sl = sl || 0;
		l /= 2;

		return [h, sl * 100, l * 100];
	};

	// http://dev.w3.org/csswg/css-color/#hwb-to-rgb
	convert.hwb.rgb = function (hwb) {
		var h = hwb[0] / 360;
		var wh = hwb[1] / 100;
		var bl = hwb[2] / 100;
		var ratio = wh + bl;
		var i;
		var v;
		var f;
		var n;

		// wh + bl cant be > 1
		if (ratio > 1) {
			wh /= ratio;
			bl /= ratio;
		}

		i = Math.floor(6 * h);
		v = 1 - bl;
		f = 6 * h - i;

		if ((i & 0x01) !== 0) {
			f = 1 - f;
		}

		n = wh + f * (v - wh); // linear interpolation

		var r;
		var g;
		var b;
		switch (i) {
			default:
			case 6:
			case 0: r = v; g = n; b = wh; break;
			case 1: r = n; g = v; b = wh; break;
			case 2: r = wh; g = v; b = n; break;
			case 3: r = wh; g = n; b = v; break;
			case 4: r = n; g = wh; b = v; break;
			case 5: r = v; g = wh; b = n; break;
		}

		return [r * 255, g * 255, b * 255];
	};

	convert.cmyk.rgb = function (cmyk) {
		var c = cmyk[0] / 100;
		var m = cmyk[1] / 100;
		var y = cmyk[2] / 100;
		var k = cmyk[3] / 100;
		var r;
		var g;
		var b;

		r = 1 - Math.min(1, c * (1 - k) + k);
		g = 1 - Math.min(1, m * (1 - k) + k);
		b = 1 - Math.min(1, y * (1 - k) + k);

		return [r * 255, g * 255, b * 255];
	};

	convert.xyz.rgb = function (xyz) {
		var x = xyz[0] / 100;
		var y = xyz[1] / 100;
		var z = xyz[2] / 100;
		var r;
		var g;
		var b;

		r = (x * 3.2406) + (y * -1.5372) + (z * -0.4986);
		g = (x * -0.9689) + (y * 1.8758) + (z * 0.0415);
		b = (x * 0.0557) + (y * -0.2040) + (z * 1.0570);

		// assume sRGB
		r = r > 0.0031308
			? ((1.055 * Math.pow(r, 1.0 / 2.4)) - 0.055)
			: r * 12.92;

		g = g > 0.0031308
			? ((1.055 * Math.pow(g, 1.0 / 2.4)) - 0.055)
			: g * 12.92;

		b = b > 0.0031308
			? ((1.055 * Math.pow(b, 1.0 / 2.4)) - 0.055)
			: b * 12.92;

		r = Math.min(Math.max(0, r), 1);
		g = Math.min(Math.max(0, g), 1);
		b = Math.min(Math.max(0, b), 1);

		return [r * 255, g * 255, b * 255];
	};

	convert.xyz.lab = function (xyz) {
		var x = xyz[0];
		var y = xyz[1];
		var z = xyz[2];
		var l;
		var a;
		var b;

		x /= 95.047;
		y /= 100;
		z /= 108.883;

		x = x > 0.008856 ? Math.pow(x, 1 / 3) : (7.787 * x) + (16 / 116);
		y = y > 0.008856 ? Math.pow(y, 1 / 3) : (7.787 * y) + (16 / 116);
		z = z > 0.008856 ? Math.pow(z, 1 / 3) : (7.787 * z) + (16 / 116);

		l = (116 * y) - 16;
		a = 500 * (x - y);
		b = 200 * (y - z);

		return [l, a, b];
	};

	convert.lab.xyz = function (lab) {
		var l = lab[0];
		var a = lab[1];
		var b = lab[2];
		var x;
		var y;
		var z;

		y = (l + 16) / 116;
		x = a / 500 + y;
		z = y - b / 200;

		var y2 = Math.pow(y, 3);
		var x2 = Math.pow(x, 3);
		var z2 = Math.pow(z, 3);
		y = y2 > 0.008856 ? y2 : (y - 16 / 116) / 7.787;
		x = x2 > 0.008856 ? x2 : (x - 16 / 116) / 7.787;
		z = z2 > 0.008856 ? z2 : (z - 16 / 116) / 7.787;

		x *= 95.047;
		y *= 100;
		z *= 108.883;

		return [x, y, z];
	};

	convert.lab.lch = function (lab) {
		var l = lab[0];
		var a = lab[1];
		var b = lab[2];
		var hr;
		var h;
		var c;

		hr = Math.atan2(b, a);
		h = hr * 360 / 2 / Math.PI;

		if (h < 0) {
			h += 360;
		}

		c = Math.sqrt(a * a + b * b);

		return [l, c, h];
	};

	convert.lch.lab = function (lch) {
		var l = lch[0];
		var c = lch[1];
		var h = lch[2];
		var a;
		var b;
		var hr;

		hr = h / 360 * 2 * Math.PI;
		a = c * Math.cos(hr);
		b = c * Math.sin(hr);

		return [l, a, b];
	};

	convert.rgb.ansi16 = function (args) {
		var r = args[0];
		var g = args[1];
		var b = args[2];
		var value = 1 in arguments ? arguments[1] : convert.rgb.hsv(args)[2]; // hsv -> ansi16 optimization

		value = Math.round(value / 50);

		if (value === 0) {
			return 30;
		}

		var ansi = 30
			+ ((Math.round(b / 255) << 2)
			| (Math.round(g / 255) << 1)
			| Math.round(r / 255));

		if (value === 2) {
			ansi += 60;
		}

		return ansi;
	};

	convert.hsv.ansi16 = function (args) {
		// optimization here; we already know the value and don't need to get
		// it converted for us.
		return convert.rgb.ansi16(convert.hsv.rgb(args), args[2]);
	};

	convert.rgb.ansi256 = function (args) {
		var r = args[0];
		var g = args[1];
		var b = args[2];

		// we use the extended greyscale palette here, with the exception of
		// black and white. normal palette only has 4 greyscale shades.
		if (r === g && g === b) {
			if (r < 8) {
				return 16;
			}

			if (r > 248) {
				return 231;
			}

			return Math.round(((r - 8) / 247) * 24) + 232;
		}

		var ansi = 16
			+ (36 * Math.round(r / 255 * 5))
			+ (6 * Math.round(g / 255 * 5))
			+ Math.round(b / 255 * 5);

		return ansi;
	};

	convert.ansi16.rgb = function (args) {
		var color = args % 10;

		// handle greyscale
		if (color === 0 || color === 7) {
			if (args > 50) {
				color += 3.5;
			}

			color = color / 10.5 * 255;

			return [color, color, color];
		}

		var mult = (~~(args > 50) + 1) * 0.5;
		var r = ((color & 1) * mult) * 255;
		var g = (((color >> 1) & 1) * mult) * 255;
		var b = (((color >> 2) & 1) * mult) * 255;

		return [r, g, b];
	};

	convert.ansi256.rgb = function (args) {
		// handle greyscale
		if (args >= 232) {
			var c = (args - 232) * 10 + 8;
			return [c, c, c];
		}

		args -= 16;

		var rem;
		var r = Math.floor(args / 36) / 5 * 255;
		var g = Math.floor((rem = args % 36) / 6) / 5 * 255;
		var b = (rem % 6) / 5 * 255;

		return [r, g, b];
	};

	convert.rgb.hex = function (args) {
		var integer = ((Math.round(args[0]) & 0xFF) << 16)
			+ ((Math.round(args[1]) & 0xFF) << 8)
			+ (Math.round(args[2]) & 0xFF);

		var string = integer.toString(16).toUpperCase();
		return '000000'.substring(string.length) + string;
	};

	convert.hex.rgb = function (args) {
		var match = args.toString(16).match(/[a-f0-9]{6}|[a-f0-9]{3}/i);
		if (!match) {
			return [0, 0, 0];
		}

		var colorString = match[0];

		if (match[0].length === 3) {
			colorString = colorString.split('').map(function (char) {
				return char + char;
			}).join('');
		}

		var integer = parseInt(colorString, 16);
		var r = (integer >> 16) & 0xFF;
		var g = (integer >> 8) & 0xFF;
		var b = integer & 0xFF;

		return [r, g, b];
	};

	convert.rgb.hcg = function (rgb) {
		var r = rgb[0] / 255;
		var g = rgb[1] / 255;
		var b = rgb[2] / 255;
		var max = Math.max(Math.max(r, g), b);
		var min = Math.min(Math.min(r, g), b);
		var chroma = (max - min);
		var grayscale;
		var hue;

		if (chroma < 1) {
			grayscale = min / (1 - chroma);
		} else {
			grayscale = 0;
		}

		if (chroma <= 0) {
			hue = 0;
		} else
		if (max === r) {
			hue = ((g - b) / chroma) % 6;
		} else
		if (max === g) {
			hue = 2 + (b - r) / chroma;
		} else {
			hue = 4 + (r - g) / chroma + 4;
		}

		hue /= 6;
		hue %= 1;

		return [hue * 360, chroma * 100, grayscale * 100];
	};

	convert.hsl.hcg = function (hsl) {
		var s = hsl[1] / 100;
		var l = hsl[2] / 100;
		var c = 1;
		var f = 0;

		if (l < 0.5) {
			c = 2.0 * s * l;
		} else {
			c = 2.0 * s * (1.0 - l);
		}

		if (c < 1.0) {
			f = (l - 0.5 * c) / (1.0 - c);
		}

		return [hsl[0], c * 100, f * 100];
	};

	convert.hsv.hcg = function (hsv) {
		var s = hsv[1] / 100;
		var v = hsv[2] / 100;

		var c = s * v;
		var f = 0;

		if (c < 1.0) {
			f = (v - c) / (1 - c);
		}

		return [hsv[0], c * 100, f * 100];
	};

	convert.hcg.rgb = function (hcg) {
		var h = hcg[0] / 360;
		var c = hcg[1] / 100;
		var g = hcg[2] / 100;

		if (c === 0.0) {
			return [g * 255, g * 255, g * 255];
		}

		var pure = [0, 0, 0];
		var hi = (h % 1) * 6;
		var v = hi % 1;
		var w = 1 - v;
		var mg = 0;

		switch (Math.floor(hi)) {
			case 0:
				pure[0] = 1; pure[1] = v; pure[2] = 0; break;
			case 1:
				pure[0] = w; pure[1] = 1; pure[2] = 0; break;
			case 2:
				pure[0] = 0; pure[1] = 1; pure[2] = v; break;
			case 3:
				pure[0] = 0; pure[1] = w; pure[2] = 1; break;
			case 4:
				pure[0] = v; pure[1] = 0; pure[2] = 1; break;
			default:
				pure[0] = 1; pure[1] = 0; pure[2] = w;
		}

		mg = (1.0 - c) * g;

		return [
			(c * pure[0] + mg) * 255,
			(c * pure[1] + mg) * 255,
			(c * pure[2] + mg) * 255
		];
	};

	convert.hcg.hsv = function (hcg) {
		var c = hcg[1] / 100;
		var g = hcg[2] / 100;

		var v = c + g * (1.0 - c);
		var f = 0;

		if (v > 0.0) {
			f = c / v;
		}

		return [hcg[0], f * 100, v * 100];
	};

	convert.hcg.hsl = function (hcg) {
		var c = hcg[1] / 100;
		var g = hcg[2] / 100;

		var l = g * (1.0 - c) + 0.5 * c;
		var s = 0;

		if (l > 0.0 && l < 0.5) {
			s = c / (2 * l);
		} else
		if (l >= 0.5 && l < 1.0) {
			s = c / (2 * (1 - l));
		}

		return [hcg[0], s * 100, l * 100];
	};

	convert.hcg.hwb = function (hcg) {
		var c = hcg[1] / 100;
		var g = hcg[2] / 100;
		var v = c + g * (1.0 - c);
		return [hcg[0], (v - c) * 100, (1 - v) * 100];
	};

	convert.hwb.hcg = function (hwb) {
		var w = hwb[1] / 100;
		var b = hwb[2] / 100;
		var v = 1 - b;
		var c = v - w;
		var g = 0;

		if (c < 1) {
			g = (v - c) / (1 - c);
		}

		return [hwb[0], c * 100, g * 100];
	};

	convert.apple.rgb = function (apple) {
		return [(apple[0] / 65535) * 255, (apple[1] / 65535) * 255, (apple[2] / 65535) * 255];
	};

	convert.rgb.apple = function (rgb) {
		return [(rgb[0] / 255) * 65535, (rgb[1] / 255) * 65535, (rgb[2] / 255) * 65535];
	};

	convert.gray.rgb = function (args) {
		return [args[0] / 100 * 255, args[0] / 100 * 255, args[0] / 100 * 255];
	};

	convert.gray.hsl = convert.gray.hsv = function (args) {
		return [0, 0, args[0]];
	};

	convert.gray.hwb = function (gray) {
		return [0, 100, gray[0]];
	};

	convert.gray.cmyk = function (gray) {
		return [0, 0, 0, gray[0]];
	};

	convert.gray.lab = function (gray) {
		return [gray[0], 0, 0];
	};

	convert.gray.hex = function (gray) {
		var val = Math.round(gray[0] / 100 * 255) & 0xFF;
		var integer = (val << 16) + (val << 8) + val;

		var string = integer.toString(16).toUpperCase();
		return '000000'.substring(string.length) + string;
	};

	convert.rgb.gray = function (rgb) {
		var val = (rgb[0] + rgb[1] + rgb[2]) / 3;
		return [val / 255 * 100];
	};
	return conversions.__module.exports;
}

exports.__require = requireConversions;
