// 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) {
	  // cast to string
	  val = val + '';
	  if(val.charAt(0) !== "#" && (val.length === 3 || val.length === 6)){
	    val = '#'+val;
	  }
	  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, b, a) {
        if (!h) {
            h = this.value.h;
            s = this.value.s;
            b = this.value.b;
        }
        h *= 360;
        var R, G, B, X, C;
        h = (h % 360) / 60;
        C = b * s;
        X = C * (1 - Math.abs(h % 2 - 1));
        R = G = B = b - C;

        h = ~~h;
        R += [C, X, 0, 0, X, C][h];
        G += [X, C, C, X, 0, 0][h];
        B += [0, 0, X, C, C, X][h];
        return {
            r: Math.round(R * 255),
            g: Math.round(G * 255),
            b: Math.round(B * 255),
            a: a || this.value.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;
    }
};
