/*
* jQuery Color Animations
* Copyright 2007 John Resig
* Released under the MIT and GPL licenses.
*/

(function (jQuery) {

    // We override the animation for all of these color styles
    jQuery.each(['backgroundColor', 'borderBottomColor', 'borderLeftColor', 'borderRightColor', 'borderTopColor', 'color', 'outlineColor'], function (i, attr) {
        jQuery.fx.step[attr] = function (fx) {
            if (fx.colorFunction == undefined || fx.state == 0) {
                fx.start = getColor(fx.elem, attr);
                fx.end = getRGB(fx.end);

                if (fx.start == undefined) {
                    fx.start = [255, 255, 255, 0];
                } else {
                    if (fx.start[3] == undefined) // if alpha channel is not spotted
                        fx.start[3] = 1; 		// assume it is fully opaque
                    if (fx.start[3] == 0)			// if alpha is present and fully transparent
                        fx.start[0] = fx.start[1] = fx.start[2] = 255; // assume starting with white
                }

                if (fx.end[3] == undefined)	// if alpha channel is not spotted
                    fx.end[3] = 1; 				// assume it is fully opaque

                fx.colorFunction = (fx.start[3] == 1 && fx.end[3] == 1 ? calcRGB : calcRGBa);
            }

            fx.elem.style[attr] = fx.colorFunction();
        }
    });

    var calcRGB = function () {
        return 'rgb(' +
				Math.max(Math.min(parseInt((this.pos * (this.end[0] - this.start[0])) + this.start[0]), 255), 0) + ',' +
				Math.max(Math.min(parseInt((this.pos * (this.end[1] - this.start[1])) + this.start[1]), 255), 0) + ',' +
				Math.max(Math.min(parseInt((this.pos * (this.end[2] - this.start[2])) + this.start[2]), 255), 0) + ')';
    };
    var calcRGBa = function () {
        return 'rgba(' +
				Math.max(Math.min(parseInt((this.pos * (this.end[0] - this.start[0])) + this.start[0]), 255), 0) + ',' +
				Math.max(Math.min(parseInt((this.pos * (this.end[1] - this.start[1])) + this.start[1]), 255), 0) + ',' +
				Math.max(Math.min(parseInt((this.pos * (this.end[2] - this.start[2])) + this.start[2]), 255), 0) + ',' +
				Math.max(Math.min(parseFloat((this.pos * (this.end[3] - this.start[3])) + this.start[3]), 1), 0) + ')';
    };

    // Color Conversion functions from highlightFade
    // By Blair Mitchelmore
    // http://jquery.offput.ca/highlightFade/

    // Parse strings looking for color tuples [255,255,255]
    function getRGB(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 = /rgba?\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,?\s*((?:[0-9](?:\.[0-9]+)?)?)\s*\)/.exec(color))
            return [parseInt(result[1]), parseInt(result[2]), parseInt(result[3]), parseFloat(result[4] || 1)];

        // Look for rgb(num%,num%,num%)
        if (result = /rgba?\(\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,?\s*((?:[0-9](?:\.[0-9]+)?)?)\s*\)/.exec(color))
            return [parseFloat(result[1]) * 2.55, parseFloat(result[2]) * 2.55, parseFloat(result[3]) * 2.55, parseFloat(result[4] || 1)];

        // 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)];

        // Otherwise, we're most likely dealing with a named color
        var colorName = jQuery.trim(color).toLowerCase();
        if (colors[colorName] != undefined)
            return colors[colorName];

        return [255, 255, 255, 0];
    }

    function getColor(elem, attr) {
        var color;

        do {
            color = jQuery.curCSS(elem, attr);

            // Keep going until we find an element that has color, or we hit the body
            if (color != '' && color != 'transparent' || jQuery.nodeName(elem, "body"))
                break;

            attr = "backgroundColor";
        } while (elem = elem.parentNode);

        return getRGB(color);
    };

    // Some named colors to work with
    // From Interface by Stefan Petre
    // http://interface.eyecon.ro/

    var 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]
    };

})(jQuery);