// Color object
var Color = function(val) {
    this.value = {
        h: 0,
        s: 0,
        b: 0,
        a: 1
    };
    this.origFormat = null; // original string format
    if (val) {
        if (val.toLowerCase !== undefined) {
            this.setColor(val);
        } else if (val.h !== undefined) {
            this.value = val;
        }
    }
};

Color.prototype = {
    constructor: Color,
	// 140 predefined colors from the HTML Colors spec
	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",
		"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",
		"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",
		"wheat": "#f5deb3",
		"white": "#ffffff",
		"whitesmoke": "#f5f5f5",
		"yellow": "#ffff00",
		"yellowgreen": "#9acd32"
	},
    _sanitizeNumber: function(val) {
        if (typeof val === 'number') {
            return val;
        }
        if (isNaN(val) || (val === null) || (val === '') || (val === undefined)) {
            return 1;
        }
        if (val.toLowerCase !== undefined) {
            return parseFloat(val);
        }
        return 1;
    },
    //parse a string to HSB
    setColor: function(strVal) {
        strVal = strVal.toLowerCase();
        this.value = this.stringToHSB(strVal) ||  {
            h: 0,
            s: 0,
            b: 0,
            a: 1
        };
    },
    stringToHSB: function(strVal) {
        strVal = strVal.toLowerCase();
        var that = this,
            result = false;
        $.each(this.stringParsers, function(i, parser) {
            var match = parser.re.exec(strVal),
                values = match && parser.parse.apply(that, [match]),
                format = parser.format || 'rgba';
            if (values) {
                if (format.match(/hsla?/)) {
                    result = that.RGBtoHSB.apply(that, that.HSLtoRGB.apply(that, values));
                } else {
                    result = that.RGBtoHSB.apply(that, values);
                }
                that.origFormat = format;
                return false;
            }
            return true;
        });
        return result;
    },
    setHue: function(h) {
        this.value.h = 1 - h;
    },
    setSaturation: function(s) {
        this.value.s = s;
    },
    setBrightness: function(b) {
        this.value.b = 1 - b;
    },
    setAlpha: function(a) {
        this.value.a = parseInt((1 - a) * 100, 10) / 100;
    },
    toRGB: function(h, s, v, a) {
        h = h || this.value.h;
        s = s || this.value.s;
        v = v || this.value.b;
        a = a || this.value.a;

        var r, g, b, i, f, p, q, t;
        if (h && s === undefined && v === undefined) {
            s = h.s, v = h.v, h = h.h;
        }
        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: Math.floor(r * 255),
            g: Math.floor(g * 255),
            b: Math.floor(b * 255),
            a: a
        };
    },
    toHex: function(h, s, b, a) {
        var rgb = this.toRGB(h, s, b, a);
        return '#' + ((1 << 24) | (parseInt(rgb.r) << 16) | (parseInt(rgb.g) << 8) | parseInt(rgb.b)).toString(16).substr(1);
    },
    toHSL: function(h, s, b, a) {
        h = h || this.value.h;
        s = s || this.value.s;
        b = b || this.value.b;
        a = a || this.value.a;

        var H = h,
            L = (2 - s) * b,
            S = s * b;
        if (L > 0 && L <= 1) {
            S /= L;
        } else {
            S /= 2 - L;
        }
        L /= 2;
        if (S > 1) {
            S = 1;
        }
        return {
            h: isNaN(H) ? 0 : H,
            s: isNaN(S) ? 0 : S,
            l: isNaN(L) ? 0 : L,
            a: isNaN(a) ? 0 : a,
        };
    },
	toAlias: function(r, g, b, a) {
		var rgb = this.toHex(r, g, b, a);
		for(var alias in this.colors){
			if(this.colors[alias] == rgb){
				return alias;
			}
		}
		return false;
	},
    RGBtoHSB: function(r, g, b, a) {
        r /= 255;
        g /= 255;
        b /= 255;

        var H, S, V, C;
        V = Math.max(r, g, b);
        C = V - Math.min(r, g, b);
        H = (C === 0 ? null :
            V === r ? (g - b) / C :
            V === g ? (b - r) / C + 2 :
            (r - g) / C + 4
        );
        H = ((H + 360) % 6) * 60 / 360;
        S = C === 0 ? 0 : C / V;
        return {
            h: this._sanitizeNumber(H),
            s: S,
            b: V,
            a: this._sanitizeNumber(a)
        };
    },
    HueToRGB: function(p, q, h) {
        if (h < 0) {
            h += 1;
        } else if (h > 1) {
            h -= 1;
        }
        if ((h * 6) < 1) {
            return p + (q - p) * h * 6;
        } else if ((h * 2) < 1) {
            return q;
        } else if ((h * 3) < 2) {
            return p + (q - p) * ((2 / 3) - h) * 6;
        } else {
            return p;
        }
    },
    HSLtoRGB: function(h, s, l, a) {
        if (s < 0) {
            s = 0;
        }
        var q;
        if (l <= 0.5) {
            q = l * (1 + s);
        } else {
            q = l + s - (l * s);
        }

        var p = 2 * l - q;

        var tr = h + (1 / 3);
        var tg = h;
        var tb = h - (1 / 3);

        var r = Math.round(this.HueToRGB(p, q, tr) * 255);
        var g = Math.round(this.HueToRGB(p, q, tg) * 255);
        var b = Math.round(this.HueToRGB(p, q, tb) * 255);
        return [r, g, b, this._sanitizeNumber(a)];
    },
    toString: function(format) {
        format = format ||  'rgba';
        switch (format) {
            case 'rgb':
                {
                    var rgb = this.toRGB();
                    return 'rgb(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ')';
                }
                break;
            case 'rgba':
                {
                    var rgb = this.toRGB();
                    return 'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' + rgb.a + ')';
                }
                break;
            case 'hsl':
                {
                    var hsl = this.toHSL();
                    return 'hsl(' + Math.round(hsl.h * 360) + ',' + Math.round(hsl.s * 100) + '%,' + Math.round(hsl.l * 100) + '%)';
                }
                break;
            case 'hsla':
                {
                    var hsl = this.toHSL();
                    return 'hsla(' + Math.round(hsl.h * 360) + ',' + Math.round(hsl.s * 100) + '%,' + Math.round(hsl.l * 100) + '%,' + hsl.a + ')';
                }
                break;
            case 'hex':
                {
                    return this.toHex();
                }
                break;
			case 'alias':
				return this.toAlias() || this.toHex();
            default:
                {
                    return false;
                }
                break;
        }
    },
    // a set of RE's that can match strings and generate color tuples.
    // from John Resig color plugin
    // https://github.com/jquery/jquery-color/
    stringParsers: [{
        re: /#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})/,
        format: 'hex',
        parse: function(execResult) {
            return [
                parseInt(execResult[1], 16),
                parseInt(execResult[2], 16),
                parseInt(execResult[3], 16),
                1
            ];
        }
    }, {
        re: /#([a-fA-F0-9])([a-fA-F0-9])([a-fA-F0-9])/,
        format: 'hex',
        parse: function(execResult) {
            return [
                parseInt(execResult[1] + execResult[1], 16),
                parseInt(execResult[2] + execResult[2], 16),
                parseInt(execResult[3] + execResult[3], 16),
                1
            ];
        }
    }, {
        re: /rgb\(\s*(\d{1,3})\s*,\s*(\d{1,3})\s*,\s*(\d{1,3})\s*?\)/,
        format: 'rgb',
        parse: function(execResult) {
            return [
                execResult[1],
                execResult[2],
                execResult[3],
                1
            ];
        }
    }, {
        re: /rgb\(\s*(\d+(?:\.\d+)?)\%\s*,\s*(\d+(?:\.\d+)?)\%\s*,\s*(\d+(?:\.\d+)?)\%\s*?\)/,
        format: 'rgb',
        parse: function(execResult) {
            return [
                2.55 * execResult[1],
                2.55 * execResult[2],
                2.55 * execResult[3],
                1
            ];
        }
    }, {
        re: /rgba\(\s*(\d{1,3})\s*,\s*(\d{1,3})\s*,\s*(\d{1,3})\s*(?:,\s*(\d+(?:\.\d+)?)\s*)?\)/,
        format: 'rgba',
        parse: function(execResult) {
            return [
                execResult[1],
                execResult[2],
                execResult[3],
                execResult[4]
            ];
        }
    }, {
        re: /rgba\(\s*(\d+(?:\.\d+)?)\%\s*,\s*(\d+(?:\.\d+)?)\%\s*,\s*(\d+(?:\.\d+)?)\%\s*(?:,\s*(\d+(?:\.\d+)?)\s*)?\)/,
        format: 'rgba',
        parse: function(execResult) {
            return [
                2.55 * execResult[1],
                2.55 * execResult[2],
                2.55 * execResult[3],
                execResult[4]
            ];
        }
    }, {
        re: /hsl\(\s*(\d+(?:\.\d+)?)\s*,\s*(\d+(?:\.\d+)?)\%\s*,\s*(\d+(?:\.\d+)?)\%\s*?\)/,
        format: 'hsl',
        parse: function(execResult) {
            return [
                execResult[1] / 360,
                execResult[2] / 100,
                execResult[3] / 100,
                execResult[4]
            ];
        }
    }, {
        re: /hsla\(\s*(\d+(?:\.\d+)?)\s*,\s*(\d+(?:\.\d+)?)\%\s*,\s*(\d+(?:\.\d+)?)\%\s*(?:,\s*(\d+(?:\.\d+)?)\s*)?\)/,
        format: 'hsla',
        parse: function(execResult) {
            return [
                execResult[1] / 360,
                execResult[2] / 100,
                execResult[3] / 100,
                execResult[4]
            ];
        }
    }, {
        //predefined color name
        re: /^([a-z]{3,})$/,
        format: 'alias',
        parse: function(execResult) {
            var hexval = this.colorNameToHex(execResult[0]) ||  '#000000';
            var match = this.stringParsers[0].re.exec(hexval),
                values = match && this.stringParsers[0].parse.apply(this, [match]);
            return values;
        }
    }],
    colorNameToHex: function(name) {
        if (typeof this.colors[name.toLowerCase()] !== 'undefined') {
            return this.colors[name.toLowerCase()];
        }
        return false;
    }
};
