(function(){
	var tags;
	var defaults = {
		height: 230,
		width: 280,
		radius: 100,
		speed: 1,
		slower: 0.97,
		timer: 5,
		fontMultiplier: 25,
		tagCSSOver: {
			border: 'solid 1px red',
			color: 'red'
		},
		tagCSSOut: {
			border: '0',
			color: ''
		}
	}
	var forCalcs = {
		halfHeight: null,
		halfWidth: null,
		hwratio: null,
		dtr: null,
		diametr: null,
		speedX: null,
		speedY: null,
		tLength: null
	}
	var curState = {
		mouseOver: null,
		lastFy: null,
		lastFx: null,
		sy: null,
		cy: null,
		sx: null,
		cx: null,
		mouseX: null,
		mouseY: null
	}
	var options = {};
	jQuery.fn.tags = function(opt){
		options = jQuery.extend(defaults, opt);
		initContainer(this);
		initTags(this);
		initCalcs();
		deployTags();
		setInterval(updateTags, options.timer);
		return this;
	};
	function initCalcs(){
		forCalcs.halfHeight = options.height / 2;
		forCalcs.halfWidth = options.width / 2;
		forCalcs.speedX = options.speed / forCalcs.halfWidth;
		forCalcs.speedY = options.speed / forCalcs.halfHeight;
		forCalcs.dtr = Math.PI / 180;
		forCalcs.diametr = options.radius * 2;
		forCalcs.hwratio = options.height / options.width;
		forCalcs.whratio = options.width / options.height;
		forCalcs.tLength = tags.length - 1;
		curState.mouseOver = false;
		curState.lastFx = options.speed;
		curState.lastFy = options.speed;
	}
	function initContainer(tagCont){
		tagCont.height(options.height);
		tagCont.width(options.width);
		tagCont.css({
			'overflow': 'hidden',
			'position': 'relative'
		});
		tagCont.mousemove(function(e){
			curState.mouseX = e.pageX - this.offsetLeft;
			curState.mouseY = e.pageY - this.offsetTop;
		});
		tagCont.hover(function(){
			curState.mouseOver = true;
		}, function(){
			curState.mouseOver = false;
		});
	}
	function initTags(tagCont){
		tags = tagCont.children('ul').children();
		tags.css({
			'position': 'absolute',
			'list-style-type': 'none',
			'list-style-position': 'outside',
			'list-style-image': 'none'
		});
		for (var i = 0; i < tags.length; i++) {
			var jTag = jQuery(tags[i]);
			var link = jQuery(jTag.children()[0]);
			link.html(link.html().replace(/\s/g, '&nbsp;'));
			tags[i] = jTag;
			jTag.hover(function(){
				jQuery(this).css(options.tagCSSOver);
			}, function(){
				jQuery(this).css(options.tagCSSOut);
			})
		}
	}
	function deployTags(){
		var phi = 0;
		var theta = 0;
		var max = forCalcs.tLength + 1;
		var i = 0;
		while (i++ < max) {
			phi = Math.acos(-1 + (2 * i - 1) / max);
			theta = Math.sqrt(max * Math.PI) * phi;
			tags[i - 1].cx = options.radius * Math.cos(theta) * Math.sin(phi);
			tags[i - 1].cy = options.radius * Math.sin(theta) * Math.sin(phi);
			tags[i - 1].cz = options.radius * Math.cos(phi);
			tags[i - 1].h = jQuery(tags[i - 1]).height() / 4;
			tags[i - 1].w = jQuery(tags[i - 1]).width() / 4;
		}
	}
	function calcRotation(fy, fx){
		curState.sy = Math.sin(fy * forCalcs.dtr);
		curState.cy = Math.cos(fy * forCalcs.dtr);
		curState.sx = Math.sin(fx * forCalcs.dtr);
		curState.cx = Math.cos(fx * forCalcs.dtr);
	}
	function updateTags(){
		var fy;
		var fx;
		if (curState.mouseOver) {
			fy = options.speed - forCalcs.speedY * curState.mouseY;
			fx = forCalcs.speedX * curState.mouseX - options.speed;
		}
		else {
			fy = curState.lastFy * options.slower;
			fx = curState.lastFx * options.slower;
		}
		if (curState.lastFy != fy || curState.lastFx != fx) {
			calcRotation(fy, fx);
			curState.lastFy = fy;
			curState.lastFx = fx;
		}
		if (Math.abs(fy) > 0.01 || Math.abs(fx) > 0.01) {
			j = -1;
			while (j++ < forCalcs.tLength) {
				rx1 = tags[j].cx;
				ry1 = tags[j].cy * curState.cy + tags[j].cz * -curState.sy;
				rz1 = tags[j].cy * curState.sy + tags[j].cz * curState.cy;
				tags[j].cx = rx1 * curState.cx + rz1 * curState.sx;
				tags[j].cy = tags[j].cy * curState.cy + tags[j].cz * -curState.sy;
				tags[j].cz = rx1 * -curState.sx + rz1 * curState.cx;
				var per = forCalcs.diametr / (forCalcs.diametr + tags[j].cz);
				tags[j].x = tags[j].cx * per;
				tags[j].y = tags[j].cy * per;
				tags[j].alpha = per / 2;
				tags[j].css({
					'left': forCalcs.whratio * (tags[j].x - tags[j].w * per) + forCalcs.halfWidth,
					'top': forCalcs.hwratio * (tags[j].y - tags[j].h * per) + forCalcs.halfHeight,
					'opacity': tags[j].alpha,
					'font-size': options.fontMultiplier * tags[j].alpha + 'px',
					'z-index': Math.round(-tags[j].cz)
				});
			}
		}
	}
})()