// Colourfade plugin
(function($) {
	// Main namespace usage $('#mydiv').colourFade();
	$.fn.colourFade = function (options) {
		// Get args
		if (typeof options == 'string') { $.fn.colourFade.defaults.to = options; }
		var opts = $.extend({}, $.fn.colourFade.defaults, options);
		var n = Math.ceil(opts.speed / opts.interval);
		var t = 0;
				
		// Iterate and do it
		return this.each(function() {
			// Convenience
			$this = $(this);
			if (compare($this.css(opts.style), opts.to)) { return; }
			// Original colour variable
			var orig = getRGB($this.css(opts.style));
			// Do something
			$this.stop();
			fade($this);
		});
		
		function fade(e) {
			// ir = (speed - t) / i = iterations remaining
			// nc[x] = pc[x] - tc[x] / ir
			debug(e.css(opts.style));
			var pc = getRGB(e.css(opts.style));
			var tc = getRGB(opts.to);
			var nc = new Array();
			for(var x = 0; x < pc.length; x++) {
				nc.push(Math.ceil(pc[x] + (tc[x] - pc[x]) / ((opts.speed - t) / opts.interval)));
			}
			e.css(opts.style,makeHex(nc));
			if (t < opts.speed) {
				setTimeout(function() {
					fade(e);				
				}, opts.interval);
				t+=opts.interval;
			}
		};

	};
	
	// Plugin defaults
	$.fn.colourFade.defaults = {
		speed: 		1000,
		to: 		'#FFFFFF',
		interval: 	25,
		style: 		'background-color'
	};
	
	// Private method to get colour array from css
	function getRGB(c) {
		//var c = e.css('background-color');
		var rgb = new Array();
		if (c.substr(0,1) == "#") { // #FFF / #FFFFFF
			c = c.substr(1, c.length-1);
			if (c.length == 3) {
				for (x = 0; x < c.length; x++) { var z=c.substr(x, 1); rgb.push(h2d(z+z)); }
			} else {
				for (x = 0; x < c.length; x += 2) { rgb.push(h2d(c.substr(x, 2))); }	
			}
		} else { // rgb(255,255,255)
			var bits = c.replace('rgb(', '').split(',');
			for (x = 0; x < bits.length; x++) { rgb.push(parseInt(bits[x])); }
		}
		return rgb;
	};
	
	// Private method for hex colour creation
	function makeHex(rgb) {
		var hexOut = "#";
		for (x = 0; x < rgb.length; x++) {
			hexOut += d2h(rgb[x]);
		}
		return hexOut;
	};
	
	function compare (co,ct) {
		co = getRGB(co); ct = getRGB(ct);
		for (var x = 0; x < co.length; x++) { if (co[x] != ct[x]) return false;	}
		return true;
	};

	function d2h(d) { 
		var h = d.toString(16); 
		return (h.length < 2) ? '0'+h : h;
	};
	
	function h2d(h) { 
		return parseInt(h, 16); 
	}; 
	
	function debug(msg) {
		$('#debug').append(msg + '<br />');	
	}

})(jQuery);
			
/*
'Fade from ' + $this.css('background-color') + ' to ' + opts.to + ' in ' + opts.speed / 1000 + ((opts.speed == 1000)? ' second' : ' seconds')

*/// JavaScript Document