/**
 * A class to parse color values
 * @author Stoyan Stefanov <sstoo@gmail.com>
 * @link   http://www.phpied.com/rgb-color-parser-in-javascript/
 * @license Use it if you like it
 */
function RGBColor(color_string)
{
    this.ok = false;

    // strip any leading #
    if (color_string.charAt(0) == '#') { // remove # if any
        color_string = color_string.substr(1,6);
    }

    color_string = color_string.replace(/ /g,'');
    color_string = color_string.toLowerCase();

    // before getting into regexps, try simple matches
    // and overwrite the input
    var simple_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',
        feldspar: 'd19275',
        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',
        lightslateblue: '8470ff',
        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',
        violetred: 'd02090',
        wheat: 'f5deb3',
        white: 'ffffff',
        whitesmoke: 'f5f5f5',
        yellow: 'ffff00',
        yellowgreen: '9acd32'
    };
    for (var key in simple_colors) {
        if (color_string == key) {
            color_string = simple_colors[key];
        }
    }
    // emd of simple type-in colors

    // array of color definition objects
    var color_defs = [
        {
            re: /^rgb\((\d{1,3}),\s*(\d{1,3}),\s*(\d{1,3})\)$/,
            example: ['rgb(123, 234, 45)', 'rgb(255,234,245)'],
            process: function (bits){
                return [
                    parseInt(bits[1]),
                    parseInt(bits[2]),
                    parseInt(bits[3])
                ];
            }
        },
        {
            re: /^(\w{2})(\w{2})(\w{2})$/,
            example: ['#00ff00', '336699'],
            process: function (bits){
                return [
                    parseInt(bits[1], 16),
                    parseInt(bits[2], 16),
                    parseInt(bits[3], 16)
                ];
            }
        },
        {
            re: /^(\w{1})(\w{1})(\w{1})$/,
            example: ['#fb0', 'f0f'],
            process: function (bits){
                return [
                    parseInt(bits[1] + bits[1], 16),
                    parseInt(bits[2] + bits[2], 16),
                    parseInt(bits[3] + bits[3], 16)
                ];
            }
        }
    ];

    // search through the definitions to find a match
    for (var i = 0; i < color_defs.length; i++) {
        var re = color_defs[i].re;
        var processor = color_defs[i].process;
        var bits = re.exec(color_string);
        if (bits) {
            channels = processor(bits);
            this.r = channels[0];
            this.g = channels[1];
            this.b = channels[2];
            this.ok = true;
        }

    }

    // validate/cleanup values
    this.r = (this.r < 0 || isNaN(this.r)) ? 0 : ((this.r > 255) ? 255 : this.r);
    this.g = (this.g < 0 || isNaN(this.g)) ? 0 : ((this.g > 255) ? 255 : this.g);
    this.b = (this.b < 0 || isNaN(this.b)) ? 0 : ((this.b > 255) ? 255 : this.b);

    // some getters
    this.toRGB = function () {
        return 'rgb(' + this.r + ', ' + this.g + ', ' + this.b + ')';
    }
    this.toHex = function () {
        var r = this.r.toString(16);
        var g = this.g.toString(16);
        var b = this.b.toString(16);
        if (r.length == 1) r = '0' + r;
        if (g.length == 1) g = '0' + g;
        if (b.length == 1) b = '0' + b;
        return '#' + r + g + b;
    }

    // help
    this.getHelpXML = function () {

        var examples = new Array();
        // add regexps
        for (var i = 0; i < color_defs.length; i++) {
            var example = color_defs[i].example;
            for (var j = 0; j < example.length; j++) {
                examples[examples.length] = example[j];
            }
        }
        // add type-in colors
        for (var sc in simple_colors) {
            examples[examples.length] = sc;
        }

        var xml = document.createElement('ul');
        xml.setAttribute('id', 'rgbcolor-examples');
        for (var i = 0; i < examples.length; i++) {
            try {
                var list_item = document.createElement('li');
                var list_color = new RGBColor(examples[i]);
                var example_div = document.createElement('div');
                example_div.style.cssText =
                        'margin: 3px; '
                        + 'border: 1px solid black; '
                        + 'background:' + list_color.toHex() + '; '
                        + 'color:' + list_color.toHex()
                ;
                example_div.appendChild(document.createTextNode('test'));
                var list_item_value = document.createTextNode(
                    ' ' + examples[i] + ' -> ' + list_color.toRGB() + ' -> ' + list_color.toHex()
                );
                list_item.appendChild(example_div);
                list_item.appendChild(list_item_value);
                xml.appendChild(list_item);

            } catch(e){}
        }
        return xml;

    }
}
/**
 * Added by Glenn Wilson for Embedding ChessFlash
 * 
 * @link   http://glennwilson.com/
 * @license Use it if you like it
 */
function getElementStyle(elemID, IEStyleProp, CSSStyleProp) {
  try {
    var elem = document.getElementById(elemID);
    return getStyle(elem, IEStyleProp, CSSStyleProp);
  } catch(e){}
  return null;    
}

function getStyle(elem, IEStyleProp, CSSStyleProp) {
  try {
    if (elem == null) return null;
    var style;
    if (elem.currentStyle) {
      style = elem.currentStyle[IEStyleProp];
    } else if (window.getComputedStyle) {
      var compStyle = window.getComputedStyle(elem, "");
	    style = compStyle.getPropertyValue(CSSStyleProp);
    }
    if (style == "transparent") return getStyle(elem.parentNode, IEStyleProp, CSSStyleProp);
    return style;
  } catch(e){}
	return null;
}

function fixcolor(clrtext, fallback) {
  if (clrtext == null) return fallback;
  var color = new RGBColor(clrtext);
  var hexcolor = fallback;
  if (color.ok) {
    hexcolor = color.toHex().substr(1);
  }
  return hexcolor;
}

function createDark(bgc, fgc) {
  var bgcdelta = colorDelta(bgc);
  var fgcdelta = colorDelta(fgc);
  var clr = bgc;
  if (fgcdelta > 0 && sumColors(fgc) < 500) {
  	clr = fgc;
  }
  if (bgcdelta > 0 && sumColors(bgc) < 500) {
  	clr = bgc;
  }

  if (colorDelta(clr) == 0) return "11AA11";  // no color variation
  var clrsum = sumColors(clr);
  while (clrsum < 250) { // too dark
  	clr = lightenColor(clr);
  	clrsum = sumColors(clr);
  }
  while (clrsum > 400) { // too light
  	clr = darkenColor(clr);
  	clrsum = sumColors(clr);
  }

  return clr;
}

function sumColors(clr) {
  var re = /^(\w{2})(\w{2})(\w{2})$/;
  var bits = re.exec(clr);
  var sum = parseInt(bits[1],16) + parseInt(bits[2],16) + parseInt(bits[3],16);
  return sum
}

function colorDelta(clr) {
  var re = /^(\w{2})(\w{2})(\w{2})$/;
  var bits = re.exec(clr);
  var red = parseInt(bits[1],16);
  var green = parseInt(bits[2],16);
  var blue = parseInt(bits[3],16);
  var max = red > green ? red : green;
  max = max > blue ? max : blue;
  var min = red < green ? red : green;
  min = min < blue ? min : blue;
  return max - min;
}

function lightenColor(clr) {
  var re = /^(\w{2})(\w{2})(\w{2})$/;
  var bits = re.exec(clr);
  var red = Math.round(parseInt(bits[1],16) * 1.2 + 1);
  var green = Math.round(parseInt(bits[2],16) * 1.2 + 1);
  var blue = Math.round(parseInt(bits[3], 16) * 1.2 + 1);
  if (red > 255) red = 255;
  if (green > 255) green = 255;
  if (blue > 255) blue = 255;
  var newColor = red + 256 * green + 65536 * blue;
  var clrstr = newColor.toString(16);
  while (clrstr.length < 6) {
  	clrstr = "0" + clrstr;
  }
  return clrstr;
}

function darkenColor(clr) {
  var re = /^(\w{2})(\w{2})(\w{2})$/;
  var bits = re.exec(clr);
  var red = Math.round(parseInt(bits[1],16) / 1.2);
  var green = Math.round(parseInt(bits[2],16) / 1.2);
  var blue = Math.round(parseInt(bits[3],16) / 1.2);
  if (red < 0) red = 0;
  if (green < 0) green = 0;
  if (blue < 0) blue = 0;
  var newColor = red + 256 * green + 65536 * blue;
  var clrstr = newColor.toString(16);
  while (clrstr.length < 6) {
  	clrstr = "0" + clrstr;
  }
  return clrstr;
}

/** keep for backwards compatability **/
function embedCfCss(width, height, flashvars) { 
  	return embedTextCfInlineCss(width, height, flashvars);    
}

function embedTextCfInlineCss(width, height, flashvars) {
    document.write('<span id="cfs1234"></span>');
    var bgc = fixcolor(getElementStyle('cfs1234', 'backgroundColor', 'background-color'), "ffffff");
    var fgc = fixcolor(getElementStyle('cfs1234', 'color', 'color'), "000000");
    var objectEmbed = '<object type="application/x-shockwave-flash" data="http://chessflash.com/releases/latest/ChessFlash.swf" width="' + width + '" height="' + height + '">';
    objectEmbed += '<param name="movie" value="http://chessflash.com/releases/latest/ChessFlash.swf" />';
    objectEmbed += '<param name="FlashVars" value="' 
      + 'dark=' +  createDark(bgc, fgc)
      + '&background=' + bgc
      + '&mtbackground=ffffff&' 
      + flashvars 
      + '"/>';
    objectEmbed += '</object>';
  	return objectEmbed;    
}

function embedTextCfInlineCssOver(width, height, flashvars, overdark, overbackground) {
    document.write('<span id="cfs1234"></span>');
    var bgc = fixcolor(getElementStyle('cfs1234', 'backgroundColor', 'background-color'), "ffffff");
    var fgc = fixcolor(getElementStyle('cfs1234', 'color', 'color'), "000000");
    var dark = createDark(bgc, fgc);
    var objectEmbed = '<object type="application/x-shockwave-flash" data="http://chessflash.com/releases/latest/ChessFlash.swf" width="' + width + '" height="' + height + '">';
    objectEmbed += '<param name="movie" value="http://chessflash.com/releases/latest/ChessFlash.swf" />';
    objectEmbed += '<param name="FlashVars" value="' 
      + 'dark=' +  dark
      + '&background=' + bgc
      + '&mtbackground=ffffff&' 
      + flashvars; 
      if (overdark != null && overdark.length > 0) 
          objectEmbed += '&dark=' + fixcolor(overdark, dark);
      if (overbackground != null && overbackground.length > 0) 
          objectEmbed += '&background=' + fixcolor(overbackground, bgc);
      objectEmbed += '"/>';

    objectEmbed += '</object>';
  	return objectEmbed;    
}