/**
 * jQuery TOOLS plugin :: tabs.history 1.0.2
 *
 * Copyright (c) 2009 Tero Piirainen
 * http://flowplayer.org/tools/tabs.html#history
 *
 * Dual licensed under MIT and GPL 2+ licenses
 * http://www.opensource.org/licenses
 *
 * Launch  : September 2009
 * Date: ${date}
 * Revision: ${revision}
 */
(function($) {

	var t = $.tools.tabs;
	t.plugins = t.plugins || {};

	t.plugins.history = {
		version: '1.0.2',
		conf: {
			api: false
		}
	};

	var hash, iframe;

	function setIframe(h) {
		if (h) {
			var doc = iframe.contentWindow.document;
			doc.open().close();
			doc.location.hash = h;
		}
	}

	// jQuery plugin implementation
	$.fn.onHash = function(fn) {

		var el = this;

		// IE
		if ($.browser.msie && $.browser.version < '8') {

			// create iframe that is constantly checked for hash changes
			if (!iframe) {
				iframe = $("<iframe/>").attr("src", "javascript:false;").hide().get(0);
				$("body").append(iframe);

				setInterval(function() {
					var idoc = iframe.contentWindow.document,
						 h = idoc.location.hash;

					if (hash !== h) {
						$.event.trigger("hash", h);
						hash = h;
					}
				}, 100);

				setIframe(location.hash || '#');
			}

			// when link is clicked the iframe hash updated
			el.bind("click.hash", function(e) {
				setIframe($(this).attr("href"));
			});


		// other browsers scans for location.hash changes directly withou iframe hack
		} else {
			setInterval(function() {
				var h = location.hash;
				var els = el.filter("[href$=" + h + "]");

				if (!els.length) {
					h = h.replace("#", "");
					els = el.filter("[href$=" + h + "]");
				}

				if (els.length && h !== hash) {
					hash = h;
					$.event.trigger("hash", h);
				}
			}, 100);
		}

		// bind a history listener
		$(window).bind("hash", fn);

		// return jQuery
		return this;
	};


	$.fn.history = function(conf) {

		var globals = $.extend({}, t.plugins.history.conf), ret;
		conf = $.extend(globals, conf);

		this.each(function() {

			var api = $(this).tabs(),
				 tabs = api.getTabs();

			if (api) { ret = api; }

			// enable history support
			tabs.onHash(function(evt, hash) {
				if (!hash || hash == '#') { hash = api.getConf().initialIndex; }
				api.click(hash);
			});

			// tab clicks perform their original action
			tabs.click(function(e) {
				location.hash = $(this).attr("href").replace("#", "");
			});

		});

		return conf.api ? ret : this;

	};

})(jQuery);