// tipsy, facebook style tooltips for jquery
// version 1.0.0a
// (c) 2008-2010 jason frame [jason@onehackoranother.com]
// releated under the MIT license

(function($) {
	function fixTitle($ele) {
		if ($ele.attr("title") || typeof($ele.attr("original-title")) != "string") {
			$ele.attr("original-title", $ele.attr("title") || "").removeAttr("title");
		}
	}
	function Tipsy(element, options) {
		this.$element = $(element);
		this.options = options;
		this.enabled = true;
		fixTitle(this.$element);
	}
	Tipsy.prototype = {
		show: function() {
			var title = this.getTitle();
			if (title && this.enabled) {
				var $tip = this.tip();
				$tip.find(".tipsy-inner")[this.options.html ? "html" : "text"](title);
				$tip[0].className = "tipsy";
				$tip.remove().css({top: 0, left: 0, visibility: "hidden", display: "block"}).appendTo(document.body);
				var pos = $.extend({}, this.$element.offset(), {
					width: this.$element[0].offsetWidth,
					height: this.$element[0].offsetHeight
				});
				var actualWidth = $tip[0].offsetWidth, actualHeight = $tip[0].offsetHeight;
				var gravity = (typeof this.options.gravity == "function") ? this.options.gravity.call(this.$element[0]) : this.options.gravity;
				var tp;
				switch (gravity.charAt(0)) {
					case "n":
						tp = {top: pos.top + pos.height + this.options.offset, left: pos.left + pos.width / 2 - actualWidth / 2};
					break;
					case "s":
						tp = {top: pos.top - actualHeight - this.options.offset, left: pos.left + pos.width / 2 - actualWidth / 2};
					break;
					case "e":
						tp = {top: pos.top + pos.height / 2 - actualHeight / 2, left: pos.left - actualWidth - this.options.offset};
					break;
					case "w":
						tp = {top: pos.top + pos.height / 2 - actualHeight / 2, left: pos.left + pos.width + this.options.offset};
					break;
				}
				if (gravity.length == 2) {
					if (gravity.charAt(1) == "w") {
						tp.left = pos.left + pos.width / 2 - 15;
					}
					else {
						tp.left = pos.left + pos.width / 2 - actualWidth + 15;
					}
				}
				$tip.css(tp).addClass("tipsy-" + gravity);
				if (this.options.fade) {
					$tip.stop().css({opacity: 0, display: "block", visibility: "visible"}).animate({opacity: this.options.opacity});
				}
				else {
					$tip.css({visibility: "visible", opacity: this.options.opacity});
				}
			}
		},
		hide: function() {
			if (this.options.fade) {
				this.tip().stop().fadeOut(function() { $(this).remove(); });
			}
			else {
				this.tip().remove();
			}
		},
		getTitle: function() {
			var title, $e = this.$element, o = this.options;
			fixTitle($e);
			var title, o = this.options;
			if (typeof o.title == "string") {
				title = $e.attr(o.title == "title" ? "original-title" : o.title);
			}
			else if (typeof o.title == "function") {
				title = o.title.call($e[0]);
			}
			title = ("" + title).replace(/(^\s*|\s*$)/, "");
			return title || o.fallback;
		},
		tip: function() {
			if (!this.$tip) {
				this.$tip = $("<div class=\"tipsy\"></div>").html("<div class=\"tipsy-arrow\"></div><div class=\"tipsy-inner\"/></div>");
			}
			return this.$tip;
		},
		validate: function() {
			if (!this.$element[0].parentNode) {
				this.hide();
				this.$element = null;
				this.options = null;
			}
		},
		enable: function() { this.enabled = true; },
		disable: function() { this.enabled = false; },
		toggleEnabled: function() { this.enabled = !this.enabled; }
	};
	$.fn.tipsy = function(options) {
		if (options === true) {
			return this.data("tipsy");
		}
		else if (typeof options == "string") {
			return this.data("tipsy")[options]();
		}
		options = $.extend({}, $.fn.tipsy.defaults, options);
		function get(ele) {
			var tipsy = $.data(ele, "tipsy");
			if (!tipsy) {
				tipsy = new Tipsy(ele, $.fn.tipsy.elementOptions(ele, options));
				$.data(ele, "tipsy", tipsy);
			}
			return tipsy;
		}
		function enter() {
			var tipsy = get(this);
			tipsy.hoverState = "in";
			if (options.delayIn == 0) {
				tipsy.show();
			}
			else {
				setTimeout(function() { if (tipsy.hoverState == "in") tipsy.show(); }, options.delayIn);
			}
		};
		function leave() {
			var tipsy = get(this);
			tipsy.hoverState = "out";
			if (options.delayOut == 0) {
				tipsy.hide();
			}
			else {
				setTimeout(function() { if (tipsy.hoverState == "out") tipsy.hide(); }, options.delayOut);
			}
		};
		if (!options.live) this.each(function() { get(this); });
		if (options.trigger != "manual") {
			var binder   = options.live ? "live" : "bind",
			eventIn  = options.trigger == "hover" ? "mouseenter" : "focus",
			eventOut = options.trigger == "hover" ? "mouseleave" : "blur";
			this[binder](eventIn, enter)[binder](eventOut, leave);
		}
		return this;
	};
	$.fn.tipsy.defaults = {
		delayIn:0,
		delayOut:0,
		fade:true,
		fallback:"",
		gravity:"n",
		html:false,
		live:true,
		offset:0,
		opacity:0.8,
		title:"title",
		trigger:"hover"
	};
	$.fn.tipsy.elementOptions = function(ele, options) {
		return $.metadata ? $.extend({}, options, $(ele).metadata()) : options;
	};
	$.fn.tipsy.autoNS = function() {
		return $(this).offset().top > ($(document).scrollTop() + $(window).height() / 2) ? "s" : "n";
	};
	$.fn.tipsy.autoWE = function() {
		return $(this).offset().left > ($(document).scrollLeft() + $(window).width() / 2) ? "e" : "w";
	};
})(jQuery);