/**
 * jQuery Color Utilities
 * Written by Krinkle in 2011
 * Released under the MIT and GPL licenses.
 * Mostly based on other plugins and functions (taken through JSLint and optimized a little).
 * Sources cited locally.
 */
( function( $ ) {
$.colorUtil = {

	// Color Conversion function from highlightFade
	// By Blair Mitchelmore
	// http://jquery.offput.ca/highlightFade/
	// Parse strings looking for color tuples [255,255,255]
	getRGB : function( color ) {
		var result;

		// Check if we're already dealing with an array of colors
		if ( color && color.constructor == Array && color.length == 3 ){
			return color;
		}

		// Look for rgb(num,num,num)
		if (result = /rgb\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*\)/.exec(color)) {
			return [parseInt(result[1],10), parseInt(result[2],10), parseInt(result[3],10)];
		}

		// Look for rgb(num%,num%,num%)
		if (result = /rgb\(\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*\)/.exec(color)) {
			return [parseFloat(result[1],10)*2.55, parseFloat(result[2],10)*2.55, parseFloat(result[3])*2.55];
		}

		// Look for #a0b1c2
		if (result = /#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})/.exec(color)) {
			return [parseInt(result[1],16), parseInt(result[2],16), parseInt(result[3],16)];
		}

		// Look for #fff
		if (result = /#([a-fA-F0-9])([a-fA-F0-9])([a-fA-F0-9])/.exec(color)) {
			return [parseInt(result[1]+result[1],16), parseInt(result[2]+result[2],16), parseInt(result[3]+result[3],16)];
		}

		// Look for rgba(0, 0, 0, 0) == transparent in Safari 3
		if (result = /rgba\(0, 0, 0, 0\)/.exec(color)) {
			return $.colorUtil.colors.transparent;
		}

		// Otherwise, we're most likely dealing with a named color
		return $.colorUtil.colors[$.trim(color).toLowerCase()];
	},

	// Some named colors to work with
	// From Interface by Stefan Petre
	// http://interface.eyecon.ro/
	colors: {
		aqua:[0,255,255],
		azure:[240,255,255],
		beige:[245,245,220],
		black:[0,0,0],
		blue:[0,0,255],
		brown:[165,42,42],
		cyan:[0,255,255],
		darkblue:[0,0,139],
		darkcyan:[0,139,139],
		darkgrey:[169,169,169],
		darkgreen:[0,100,0],
		darkkhaki:[189,183,107],
		darkmagenta:[139,0,139],
		darkolivegreen:[85,107,47],
		darkorange:[255,140,0],
		darkorchid:[153,50,204],
		darkred:[139,0,0],
		darksalmon:[233,150,122],
		darkviolet:[148,0,211],
		fuchsia:[255,0,255],
		gold:[255,215,0],
		green:[0,128,0],
		indigo:[75,0,130],
		khaki:[240,230,140],
		lightblue:[173,216,230],
		lightcyan:[224,255,255],
		lightgreen:[144,238,144],
		lightgrey:[211,211,211],
		lightpink:[255,182,193],
		lightyellow:[255,255,224],
		lime:[0,255,0],
		magenta:[255,0,255],
		maroon:[128,0,0],
		navy:[0,0,128],
		olive:[128,128,0],
		orange:[255,165,0],
		pink:[255,192,203],
		purple:[128,0,128],
		violet:[128,0,128],
		red:[255,0,0],
		silver:[192,192,192],
		white:[255,255,255],
		yellow:[255,255,0],
		transparent: [255,255,255]
	},
	/**
	 * http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript
	 * Converts an RGB color value to HSL. Conversion formula
	 * adapted from http://en.wikipedia.org/wiki/HSL_color_space.
	 * Assumes r, g, and b are contained in the set [0, 255] and
	 * returns h, s, and l in the set [0, 1].
	 *
	 * @param	Number	R		The red color value
	 * @param	Number	G		The green color value
	 * @param	Number	B		The blue color value
	 * @return	Array			The HSL representation
	 */
	rgbToHsl: function( R, G, B ) {
		var	r = R / 255,
			g = G / 255,
			b = B / 255;
		var max = Math.max(r, g, b), min = Math.min(r, g, b);
		var h, s, l = (max + min) / 2;

		if(max == min){
			h = s = 0; // achromatic
		}else{
			var d = max - min;
			s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
			switch(max){
				case r: h = (g - b) / d + (g < b ? 6 : 0); break;
				case g: h = (b - r) / d + 2; break;
				case b: h = (r - g) / d + 4; break;
			}
			h /= 6;
		}

		return [h, s, l];
	},
	/**
	 * http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript
	 * Converts an HSL color value to RGB. Conversion formula
	 * adapted from http://en.wikipedia.org/wiki/HSL_color_space.
	 * Assumes h, s, and l are contained in the set [0, 1] and
	 * returns r, g, and b in the set [0, 255].
	 *
	 * @param	Number	h		The hue
	 * @param	Number	s		The saturation
	 * @param	Number	l		The lightness
	 * @return	Array			The RGB representation
	 */
	hslToRgb: function( h, s, l ) {
		var r, g, b;

		if(s === 0){
			r = g = b = l; // achromatic
		}else{
			var hue2rgb = function(p, q, t){
				if(t < 0){ t += 1; }
				if(t > 1){ t -= 1; }
				if(t < 1/6){ return p + (q - p) * 6 * t; }
				if(t < 1/2){ return q; }
				if(t < 2/3){ return p + (q - p) * (2/3 - t) * 6; }
				return p;
			};

			var q = l < 0.5 ? l * (1 + s) : l + s - l * s;
			var p = 2 * l - q;
			r = hue2rgb(p, q, h + 1/3);
			g = hue2rgb(p, q, h);
			b = hue2rgb(p, q, h - 1/3);
		}

		return [r * 255, g * 255, b * 255];
	},
	/**
	 * Get's a brighter or darker rgb() value string.
	 *
	 * @author Krinkle
	 *
	 * @example	getCSSColorMod( 'red', +0.1 )
	 * @example	getCSSColorMod( 'rgb(200,50,50)', -0.2 )
	 *
	 * @param	Mixed	currentColor current value in css
	 * @param	Number	mod wanted brightness modification between -1 and 1
	 * @return	String 'rgb(r,g,b)'
	 */
	getColorBrightness: function( currentColor, mod ) {
		var	rgbArr = $.colorUtil.getRGB( currentColor ),
			hslArr = $.colorUtil.rgbToHsl(rgbArr[0], rgbArr[1], rgbArr[2] );
		rgbArr = $.colorUtil.hslToRgb(hslArr[0], hslArr[1], hslArr[2]+mod);
		return 'rgb(' +
			[parseInt( rgbArr[0], 10), parseInt( rgbArr[1], 10 ), parseInt( rgbArr[2], 10 )].join( ',' ) +
			')';
	}

};
} )( jQuery );