/**
 * jQuery Plugin colorBlend v1.0
 * Requires jQuery 1.2.1 (Not tested with earlier versions).
 * Based on the Fade plugin http://plugins.jquery.com/project/fade
 * Code losely based on the Cycle plugin http://plugins.jquery.com/project/cycle It was a great resource in creating this one) 
 * Copyright (c) 2007 Aaron E. [jquery at happinessinmycheeks dot com] 
 * 
 * @param: Object Array. Arguments need to be in object notation.
 * returns: jQuery.
 * options:	
 *		param:		What css color option you wish to fade. 
 *					Such as "background-color", "color", "boarder-color", "scrollbar-face-color" (I.E. Only) Etc.
 *					(default: "background-color).
 *		fps:		Frames per second (default: 30).
 *		cycles:		How many times you want the object to fade. 0 = Infinite. (default: 0).
 *		random:		Will transition from a random color to a random color. (default: false).
 *					Note: Will change isFade to false.
 *		isFade:		Will fade from to and back to the original color. (default: true).
 *					Note: Not changeable to true if random is set to true.
 *		fromColor:	Starting color. accepts RGB, Hex, Name values. (default: #000000).
 *					Will be overwritten if random is set to true. Also accepts "random" as an option.
 *		toColor:	Ending color. Same as above (default: #FFFFFF).
 *
 * Examples: 
 *		$("body").colorBlend([{fromColor:"black", toColor:"white", param:"color"}]);
 *		var myColors = [
 *			{param:'color', fromColor:"white", toColor:"black"},
 *			{param:'background-color', random: true},
 *			{param:'border-left-color', fromColor:"random", toColor:"black"},
 *			{param:'border-right-color', fromColor:"white", toColor:"black"},
 *			{param:'border-top-color', fromColor:"white", toColor:"black"},
 *			{param:'border-bottom-color', fromColor:"white", toColor:"tomato"}
 *		];
 *		$("tr").colorBlend(myColors);
 *
 *
 * Notes: If used on a lot of objects it can cause major lag. 
 */
(function($) {
	var ver = '1.0';
	var thisObj = [];
	$.fn.colorBlend = function(opts) {
		return this.each(function() {
			var $cont = $(this);
			var domObj = $(this).get(0);
			domObj.elmId = [];
			
			$.each(opts, function(i) {
				var defOps = {
					aniArray: [],
					lastPos: 0,
					pos: 0,
					currentCycle : 0,
					direction: 1,
					frames: 0,
					delay: 0,
					fromRand: false,
					toRand: false,
					animating: false
				};

				opts[i] = $.extend({}, $.fn.colorBlend.defaults, opts[i]);

				if(udf(domObj.elmId[i])) {
					domObj.elmId[i] = rndId();
				}

				thisObj[domObj.elmId[i]] = defOps;

				var inOps = thisObj[domObj.elmId[i]];
				var usOps = opts[i];
				
				if(!inOps.animating) {
					if(usOps.fromColor.toLowerCase() == "random" || inOps.fromRand) {
						usOps.fromColor = rndColor();
						inOps.fromRand = true;
					}
					
					if(usOps.toColor.toLowerCase() == "random" || inOps.toRand) {
						usOps.toColor = rndColor();
						inOps.toRand = true;
					}
					
					$cont.css(usOps.param, usOps.fromColor);

					inOps.currentCycle = usOps.cycles > 0 ? usOps.cycles : 0;
					inOps.frames = Math.floor(usOps.fps * (usOps.duration / 1000));
					inOps.delay = Math.floor(usOps.duration / inOps.frames);

					if(usOps.random) {
						usOps.isFade = false;
						usOps.fromColor = rndColor();
						usOps.toColor = rndColor();
					}
					
					if(usOps.isFade) {
						inOps.currentCycle = inOps.currentCycle * 2;
						inOps.delay = Math.floor(inOps.delay / 2);
						inOps.frames = Math.floor(inOps.frames / 2);
					}

					inOps.aniArray = buildAnimation(usOps.fromColor, usOps.toColor, inOps);
					inOps.lastPos = inOps.aniArray.length;

					go($cont, usOps, inOps);
				}
			});
		});
	};

	$.fn.colorBlend.defaults = {
		fps:				30,
		duration:			1000,
		param:				"background-color",
		cycles:				0,
		random:				false,
		isFade:				true,
		fromColor:			"#000000",
		toColor:			"#FFFFFF"
	};

	function go(elm, opts, inOps) {
		var sendStop = false;
		inOps.animating = true;
		elm.css(opts.param, inOps.aniArray[inOps.pos]);
		
		inOps.pos += inOps.direction; 

		if(inOps.pos < 0 || inOps.pos >= inOps.aniArray.length) {
			inOps.currentCycle -= inOps.currentCycle != 0 ? 1 : 0;
			inOps.direction = inOps.direction * -1;
			inOps.pos += inOps.direction;

			if(opts.random) {
				opts.fromColor = opts.toColor;
				opts.toColor = rndColor();
				inOps.aniArray = buildAnimation(opts.fromColor, opts.toColor, inOps);
			}

			if(!opts.isFade) {
				inOps.direction = 1;
				inOps.pos = 0;
			}
			
			if(inOps.currentCycle == 0 && opts.cycles > 0) {
				sendStop = true;
			}
		}

		if(!sendStop) {
			setTimeout(function(){go(elm, opts, inOps);}, inOps.delay);
		} else {
			inOps.animating = false;
		}
	}

	function buildAnimation(startColor, endColor, inOps) {
		startColor = (startColor.toLowerCase() == 'transparent' || startColor.toLowerCase() == "random") ? rndColor() : startColor;
		endColor = (endColor.toLowerCase() == 'transparent' || endColor.toLowerCase() == "random") ? rndColor() : endColor;
		
		startColor = toHexColor(startColor);
		endColor = toHexColor(endColor);
		var frames = inOps.frames;
		var frame = 0;
		var fc = ColorHexToDec(startColor).split(', '); 
		var tc = ColorHexToDec(endColor).split(', ');
		var r,g,b,h;
		var res = [];
		
		while(frame < frames) {
			r = Math.floor(fc[0] * ((frames-frame)/frames) + tc[0] * (frame/frames));
			g = Math.floor(fc[1] * ((frames-frame)/frames) + tc[1] * (frame/frames));
			b = Math.floor(fc[2] * ((frames-frame)/frames) + tc[2] * (frame/frames));
			h = ColorDecToHex(r, g, b);
			res[res.length] = h;
			frame++;
		}

		if(h != endColor) {
			res[res.length] = endColor;
		}
		
		return res;
	}

	function getHexColorByName(colorName) {
		return allColorsByName()[colorName.toLowerCase()];
	}

	function allColorsByName() {
		var colors = [];
		colors["black"] = "000000";
		colors["white"] = "FFFFFF";
		return colors;
	}

	function ColorDecToHex(r,g,b) {
		r = r.toString(16); if (r.length == 1) r = '0' + r;
		g = g.toString(16); if (g.length == 1) g = '0' + g; 
		b = b.toString(16); if (b.length == 1) b = '0' + b;
		return "#" + r + g + b;
	}

	function ColorHexToDec(value) {
		var res = [];
		value = value.replace("#", "");
		for(var i = 0;i < 3;i++) {
			res[res.length] = parseInt(value.substr(i * 2, 2), 16);
		}
		return res.join(', ');
	}

	function toHexColor(value) {
		if(value.indexOf("rgb(") > -1) {
			value = value.replace("rgb(","").replace(")", "");
			value = eval('ColorDecToHex(' + value + ')'); 
		} else {
			var colName = getHexColorByName(value);
			value = !udf(colName) ? colName : value;
		}
		
		value = value.replace("#", "");
		return "#" + value.toUpperCase();
	}

	function rndColor() {
		var res = [];
		var cm;
		for(var i = 0;i < 3;i++) {
			cm = randRange(0, 255).toString(16); 
			if (cm.length == 1) cm = '0' + cm;
			res[res.length] = cm;
		}
		return "#" + res.join('');
	}

	function randRange(lowVal, highVal) {
		 return Math.floor(Math.random()*(highVal-lowVal+1))+lowVal;
	}

	function rndId() {
		var result = [];
		for(var i = 0;i < 10;i++) {
			result[result.length] = randRange(0, 9);
		}
		return result.join('');
	}

	function udf(val) {
		return typeof(val) == 'undefined' ? true : false;
	}

})(jQuery);