/**
 * 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();

    // 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 (hash) {
        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;
        
        if (hash)
					return '#' + r + g + b;
				else
					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];
            }
        }

        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;

    }

}