/*
 * jQuery history plugin
 * 
 * sample page: http://www.mikage.to/jquery/jquery_history.html
 *
 * Copyright (c) 2006-2009 Taku Sano (Mikage Sawatari)
 * Licensed under the MIT License:
 *   http://www.opensource.org/licenses/mit-license.php
 *
 * Modified by Lincoln Cooper to add Safari support and only call the callback once during initialization
 * for msie when no initial hash supplied.
 */


jQuery.extend({
	historyCurrentHash: undefined,

	historyCallback: undefined,

	historyTarget: undefined,

	historyInit: function(callback, current_hash, target, idx){
		jQuery.historyCallback = callback;
		jQuery.historyTarget = target;

		jQuery.historyCurrentHash = current_hash;
		if (jQuery.browser.msie) {
			// To stop the callback firing twice during initilization if no hash present
			if (jQuery.historyCurrentHash == '') {
				jQuery.historyCurrentHash = '#main';
			}
			// add hidden iframe for IE
			jQuery("body").prepend('<iframe id="jQuery_history" style="display:none;"></iframe>');
			jQuery.historyAddHistory(current_hash);
		}
		else if (jQuery.browser.safari) {
			// etablish back/forward stacks
			jQuery.historyBackStack = [];
			jQuery.historyBackStack.length = history.length;
			jQuery.historyForwardStack = [];

			jQuery.isFirst = true;
		}
		location.hash = current_hash;
		jQuery.historyCallback(current_hash.replace(/^#/,''), jQuery.historyTarget, idx);
		setInterval(jQuery.historyCheck, 100);
	},

	historyAddHistory: function(hash) {
		if (jQuery.browser.msie) {
			var ihistory = jQuery("#jQuery_history")[0];
			var iframe = ihistory.contentWindow.document;
			iframe.open();
			iframe.close();
			iframe.location.hash = hash;
		} else if (jQuery.browser.safari){
			// This makes the looping function do something
			jQuery.historyBackStack.push(hash);

			jQuery.historyForwardStack.length = 0; // clear forwardStack (true click occured)
			this.isFirst = true;
		}
	},

	historyCheck: function(){
		if ((jQuery.browser.msie) && (jQuery.browser.version < 8)) {
		//if (jQuery.browser.msie) {
			// On IE, check for location.hash of iframe
			var ihistory = jQuery("#jQuery_history")[0];
			var iframe = ihistory.contentWindow.document;
			var current_hash = iframe.location.hash;
 
			if(current_hash != jQuery.historyCurrentHash) {
				location.hash = current_hash;
				jQuery.historyCurrentHash = current_hash;
				current_hash = current_hash.replace(/^#/, '').split("/");
				jQuery.historyCallback(current_hash[0], jQuery.historyTarget);
			}
		} else if (jQuery.browser.safari) {
			if (!jQuery.dontCheck) {
				var historyDelta = history.length - jQuery.historyBackStack.length;

				if (historyDelta) { // back or forward button has been pushed
					jQuery.isFirst = false;
					if (historyDelta < 0) { // back button has been pushed
						// move items to forward stack
						for (var i = 0; i < Math.abs(historyDelta); i++) jQuery.historyForwardStack.unshift(jQuery.historyBackStack.pop());
					} else { // forward button has been pushed
						// move items to back stack
						for (var i = 0; i < historyDelta; i++) jQuery.historyBackStack.push(jQuery.historyForwardStack.shift());
					}
					var cachedHash = jQuery.historyBackStack[jQuery.historyBackStack.length - 1];
					if (cachedHash != undefined) {
						jQuery.historyCurrentHash = location.hash;
						jQuery.historyCallback(cachedHash, jQuery.historyTarget);
					}
				} else if (jQuery.historyBackStack[jQuery.historyBackStack.length - 1] == undefined && !jQuery.isFirst) {
					// back button has been pushed to beginning and URL already pointed to hash (e.g. a bookmark)
					// document.URL doesn't change in Safari
					if (document.URL.indexOf('#') >= 0) {
						jQuery.historyCallback(document.URL.split('#')[1]);
					} else {
						var current_hash = location.hash;
						jQuery.historyCallback('');
					}
					jQuery.isFirst = true;
				}
			}
		} else {
			// otherwise, check for location.hash
			//var current_hash = location.hash.replace(/\?.*$/, '');
			var current_hash;
			if(!location.hash){
				current_hash = "#main";
			} else {
				current_hash = location.hash;
			}
			if(current_hash != jQuery.historyCurrentHash) {
				jQuery.historyCurrentHash = current_hash;
				current_hash = current_hash.replace(/^#/, '').split("/");
				jQuery.historyCallback(current_hash[0], jQuery.historyTarget);
			}
		}
	},

	historyLoad: function(hash, target, idx){
		var newhash;
		if (jQuery.browser.safari) {
			newhash = '#' + hash;
		} else {
			newhash = '#' + hash;
			location.hash = newhash;
		}
		jQuery.historyCurrentHash = newhash;

		if ((jQuery.browser.msie) && (jQuery.browser.version < 8)) {
			jQuery.historyAddHistory(newhash);
			jQuery.historyCallback(hash, target, idx);
		} else if (jQuery.browser.safari) {
			jQuery.dontCheck = true;
			// Manually keep track of the history values for Safari
			this.historyAddHistory(hash);
			
			// Wait a while before allowing checking so that Safari has time to update the "history" object
			// correctly (otherwise the check loop would detect a false change in hash).
			var fn = function() {jQuery.dontCheck = false;};
			window.setTimeout(fn, 200);
			jQuery.historyCallback(hash, target, idx);
			// N.B. "location.hash=" must be the last line of code for Safari as execution stops afterwards.
			//      By explicitly using the "location.hash" command (instead of using a variable set to "location.hash") the
			//      URL in the browser and the "history" object are both updated correctly.
			location.hash = newhash;
		} else {
			jQuery.historyCallback(hash, target, idx);
		}
	}
});