/**
 * A class to parse color values
 * @author Stoyan Stefanov <sstoo@gmail.com>
 * @link   http://www.phpied.com/rgb-color-parser-in-javascript/
 * @license Use it if you like it
 */
function RGBColor(color_string) {
	this.ok = false;

	// strip any leading #
	if (color_string.charAt(0) === '#') { // remove # if any
		color_string = color_string.substr(1,6);
	}

	color_string = color_string.replace(/ /g,'');
	color_string = color_string.toLowerCase();

	// before getting into regexps, try simple matches
	// and overwrite the input
	const simple_colors = {
		aliceblue: 'f0f8ff',
		antiquewhite: 'faebd7',
		aqua: '00ffff',
		aquamarine: '7fffd4',
		azure: 'f0ffff',
		beige: 'f5f5dc',
		bisque: 'ffe4c4',
		black: '000000',
		blanchedalmond: 'ffebcd',
		blue: '0000ff',
		blueviolet: '8a2be2',
		brown: 'a52a2a',
		burlywood: 'deb887',
		cadetblue: '5f9ea0',
		chartreuse: '7fff00',
		chocolate: 'd2691e',
		coral: 'ff7f50',
		cornflowerblue: '6495ed',
		cornsilk: 'fff8dc',
		crimson: 'dc143c',
		cyan: '00ffff',
		darkblue: '00008b',
		darkcyan: '008b8b',
		darkgoldenrod: 'b8860b',
		darkgray: 'a9a9a9',
		darkgreen: '006400',
		darkkhaki: 'bdb76b',
		darkmagenta: '8b008b',
		darkolivegreen: '556b2f',
		darkorange: 'ff8c00',
		darkorchid: '9932cc',
		darkred: '8b0000',
		darksalmon: 'e9967a',
		darkseagreen: '8fbc8f',
		darkslateblue: '483d8b',
		darkslategray: '2f4f4f',
		darkturquoise: '00ced1',
		darkviolet: '9400d3',
		deeppink: 'ff1493',
		deepskyblue: '00bfff',
		dimgray: '696969',
		dodgerblue: '1e90ff',
		feldspar: 'd19275',
		firebrick: 'b22222',
		floralwhite: 'fffaf0',
		forestgreen: '228b22',
		fuchsia: 'ff00ff',
		gainsboro: 'dcdcdc',
		ghostwhite: 'f8f8ff',
		gold: 'ffd700',
		goldenrod: 'daa520',
		gray: '808080',
		green: '008000',
		greenyellow: 'adff2f',
		honeydew: 'f0fff0',
		hotpink: 'ff69b4',
		indianred : 'cd5c5c',
		indigo : '4b0082',
		ivory: 'fffff0',
		khaki: 'f0e68c',
		lavender: 'e6e6fa',
		lavenderblush: 'fff0f5',
		lawngreen: '7cfc00',
		lemonchiffon: 'fffacd',
		lightblue: 'add8e6',
		lightcoral: 'f08080',
		lightcyan: 'e0ffff',
		lightgoldenrodyellow: 'fafad2',
		lightgrey: 'd3d3d3',
		lightgreen: '90ee90',
		lightpink: 'ffb6c1',
		lightsalmon: 'ffa07a',
		lightseagreen: '20b2aa',
		lightskyblue: '87cefa',
		lightslateblue: '8470ff',
		lightslategray: '778899',
		lightsteelblue: 'b0c4de',
		lightyellow: 'ffffe0',
		lime: '00ff00',
		limegreen: '32cd32',
		linen: 'faf0e6',
		magenta: 'ff00ff',
		maroon: '800000',
		mediumaquamarine: '66cdaa',
		mediumblue: '0000cd',
		mediumorchid: 'ba55d3',
		mediumpurple: '9370d8',
		mediumseagreen: '3cb371',
		mediumslateblue: '7b68ee',
		mediumspringgreen: '00fa9a',
		mediumturquoise: '48d1cc',
		mediumvioletred: 'c71585',
		midnightblue: '191970',
		mintcream: 'f5fffa',
		mistyrose: 'ffe4e1',
		moccasin: 'ffe4b5',
		navajowhite: 'ffdead',
		navy: '000080',
		oldlace: 'fdf5e6',
		olive: '808000',
		olivedrab: '6b8e23',
		orange: 'ffa500',
		orangered: 'ff4500',
		orchid: 'da70d6',
		palegoldenrod: 'eee8aa',
		palegreen: '98fb98',
		paleturquoise: 'afeeee',
		palevioletred: 'd87093',
		papayawhip: 'ffefd5',
		peachpuff: 'ffdab9',
		peru: 'cd853f',
		pink: 'ffc0cb',
		plum: 'dda0dd',
		powderblue: 'b0e0e6',
		purple: '800080',
		red: 'ff0000',
		rosybrown: 'bc8f8f',
		royalblue: '4169e1',
		saddlebrown: '8b4513',
		salmon: 'fa8072',
		sandybrown: 'f4a460',
		seagreen: '2e8b57',
		seashell: 'fff5ee',
		sienna: 'a0522d',
		silver: 'c0c0c0',
		skyblue: '87ceeb',
		slateblue: '6a5acd',
		slategray: '708090',
		snow: 'fffafa',
		springgreen: '00ff7f',
		steelblue: '4682b4',
		tan: 'd2b48c',
		teal: '008080',
		thistle: 'd8bfd8',
		tomato: 'ff6347',
		turquoise: '40e0d0',
		violet: 'ee82ee',
		violetred: 'd02090',
		wheat: 'f5deb3',
		white: 'ffffff',
		whitesmoke: 'f5f5f5',
		yellow: 'ffff00',
		yellowgreen: '9acd32',
	};

	for (const key in simple_colors) {
		if (color_string === key) {
			color_string = simple_colors[key];
		}
	}
	// emd of simple type-in colors

	// array of color definition objects
	const color_defs = [
		{
			re: /^rgb\((\d{1,3}),\s*(\d{1,3}),\s*(\d{1,3})\)$/,
			example: ['rgb(123, 234, 45)', 'rgb(255,234,245)'],
			process: function (bits) {
				return [
					parseInt(bits[1]),
					parseInt(bits[2]),
					parseInt(bits[3]),
				];
			},
		},
		{
			re: /^(\w{2})(\w{2})(\w{2})$/,
			example: ['#00ff00', '336699'],
			process: function (bits) {
				return [
					parseInt(bits[1], 16),
					parseInt(bits[2], 16),
					parseInt(bits[3], 16),
				];
			},
		},
		{
			re: /^(\w{1})(\w{1})(\w{1})$/,
			example: ['#fb0', 'f0f'],
			process: function (bits) {
				return [
					parseInt(bits[1] + bits[1], 16),
					parseInt(bits[2] + bits[2], 16),
					parseInt(bits[3] + bits[3], 16),
				];
			},
		},
	];

	// search through the definitions to find a match
	for (let i = 0; i < color_defs.length; i++) {
		const re = color_defs[i].re;
		const processor = color_defs[i].process;
		const bits = re.exec(color_string);


		if (bits) {
			channels = processor(bits);
			this.r = channels[0];
			this.g = channels[1];
			this.b = channels[2];
			this.ok = true;
		}

	}

	// validate/cleanup values
	this.r = (this.r < 0 || isNaN(this.r)) ? 0 : ((this.r > 255) ? 255 : this.r);
	this.g = (this.g < 0 || isNaN(this.g)) ? 0 : ((this.g > 255) ? 255 : this.g);
	this.b = (this.b < 0 || isNaN(this.b)) ? 0 : ((this.b > 255) ? 255 : this.b);

	// some getters
	this.toRGB = function () {
		return 'rgb(' + this.r + ', ' + this.g + ', ' + this.b + ')';
	};
	this.toHex = function () {
		let r = this.r.toString(16);
		let g = this.g.toString(16);
		let b = this.b.toString(16);

		if (r.length === 1) r = '0' + r;

		if (g.length === 1) g = '0' + g;

		if (b.length === 1) b = '0' + b;

		return '#' + r + g + b;
	};

	// help
	this.getHelpXML = function () {
		let i;
		const examples = [];
		// add regexps

		for (i = 0; i < color_defs.length; i++) {
			const example = color_defs[i].example;

			for (let j = 0; j < example.length; j++) {
				examples[examples.length] = example[j];
			}
		}
		// add type-in colors
		for (const sc in simple_colors) {
			examples[examples.length] = sc;
		}

		const xml = document.createElement('ul');

		xml.setAttribute('id', 'rgbcolor-examples');
		for (i = 0; i < examples.length; i++) {
			try {
				const list_item = document.createElement('li');
				const list_color = new RGBColor(examples[i]);
				const example_div = document.createElement('div');

				example_div.style.cssText
                        = 'margin: 3px; '
                        + 'border: 1px solid black; '
                        + 'background:' + list_color.toHex() + '; '
                        + 'color:' + list_color.toHex()
				;
				example_div.appendChild(document.createTextNode('test'));
				const list_item_value = document.createTextNode(
					' ' + examples[i] + ' -> ' + list_color.toRGB() + ' -> ' + list_color.toHex()
				);

				list_item.appendChild(example_div);
				list_item.appendChild(list_item_value);
				xml.appendChild(list_item);

			} catch (e) {}
		}
		return xml;
	};
}

export default RGBColor;