/*!
 * jQuery Color Utilities
 *
 * Released under the MIT and GPL licenses.
 *
 * Mostly based on other plugins and functions (linted and optimized a little).
 * Sources cited inline.
 */
( function ( $ ) {
	/**
	 * @class jQuery.colorUtil
	 * @singleton
	 */
	$.colorUtil = {

		/**
		 * Parse CSS color strings looking for color tuples
		 *
		 * Based on highlightFade by Blair Mitchelmore
		 * <http://jquery.offput.ca/highlightFade/>
		 *
		 * @param {Array|string} color
		 * @return {Array}
		 */
		getRGB: function ( color ) {
			/*jshint boss:true */
			var result;

			// Check if we're already dealing with an array of colors
			if ( color && $.isArray( color ) && 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 ] ) * 2.55,
					parseFloat( result[ 2 ] ) * 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() ];
		},

		/**
		 * Named color map
		 *
		 * Based on Interface by Stefan Petre
		 * <http://interface.eyecon.ro/>
		 *
		 * @property {Object}
		 */
		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 ]
		},

		/**
		 * Convert an RGB color value to HSL.
		 *
		 * Conversion formula based on
		 * <http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript>
		 *
		 * Adapted from <https://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 {number[]} The HSL representation
		 */
		rgbToHsl: function ( r, g, b ) {
			r = r / 255;
			g = g / 255;
			b = b / 255;

			var d,
				max = Math.max( r, g, b ),
				min = Math.min( r, g, b ),
				h,
				s,
				l = ( max + min ) / 2;

			if ( max === min ) {
				// achromatic
				h = s = 0;
			} else {
				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 ];
		},

		/**
		 * Convert an HSL color value to RGB.
		 *
		 * Conversion formula based on
		 * <http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript>
		 *
		 * Adapted from <https://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 {number[]} The RGB representation
		 */
		hslToRgb: function ( h, s, l ) {
			var r, g, b, hue2rgb, q, p;

			if ( s === 0 ) {
				r = g = b = l; // achromatic
			} else {
				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;
				};

				q = l < 0.5 ? l * ( 1 + s ) : l + s - l * s;
				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 a brighter or darker rgb() value string.
		 *
		 * Usage:
		 *
		 *     $.colorUtil.getColorBrightness( 'red', +0.1 );
		 *     // > "rgb(255,50,50)"
		 *     $.colorUtil.getColorBrightness( 'rgb(200,50,50)', -0.2 );
		 *     // > "rgb(118,29,29)"
		 *
		 * @param {Mixed} currentColor Current value in css
		 * @param {number} mod Wanted brightness modification between -1 and 1
		 * @return {string} Like `'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 ) );
