/*
 * 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,
	historyIframeSrc: undefined,
	historyNeedIframe: jQuery.browser.msie && (jQuery.browser.version < 8 || document.documentMode < 8),
	historyHashStack: {},
	
	historyInit: function(callback, src){
		jQuery.historyCallback = callback;
		if (src) jQuery.historyIframeSrc = src;
		var current_hash = location.hash.replace(/\?.*$/, '');
		
		jQuery.historyCurrentHash = current_hash;
		if (jQuery.historyNeedIframe) {
			// To stop the callback firing twice during initilization if no hash present
			if (jQuery.historyCurrentHash == '') {
				jQuery.historyCurrentHash = '#';
			}
		
			// add hidden iframe for IE
			jQuery("body").prepend('<iframe id="jQuery_history" style="display: none;"'+
				' src="javascript:false;"></iframe>'
			);
			var ihistory = jQuery("#jQuery_history")[0];
			var iframe = ihistory.contentWindow.document;
			iframe.open();
			iframe.close();
			iframe.location.hash = current_hash;
		}
		else if (jQuery.browser.safari) {
			// etablish back/forward stacks
			jQuery.historyBackStack = [];
			jQuery.historyBackStack.length = history.length;
			jQuery.historyForwardStack = [];
			jQuery.lastHistoryLength = history.length;
			
			jQuery.isFirst = true;
		}
		if(current_hash)
		{
			var cleanedHash = current_hash.replace(/^#/, '');
			var stackedHash = jQuery.historyHashStack[cleanedHash]
			jQuery.historyCallback(stackedHash,true);
		}
		setInterval(jQuery.historyCheck, 100);
	},
	
	historyAddHistory: function(hash) {
		// 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.historyNeedIframe) {
			// On IE, check for location.hash of iframe
			var ihistory = jQuery("#jQuery_history")[0];
			var iframe = ihistory.contentDocument || ihistory.contentWindow.document;
			var current_hash = iframe.location.hash.replace(/\?.*$/, '');
			if(current_hash != jQuery.historyCurrentHash) {
			
				location.hash = current_hash;
				jQuery.historyCurrentHash = current_hash;
				var cleanedHash = current_hash.replace(/^#/, '');
				
				var stackedHash = jQuery.historyHashStack[cleanedHash];
				//alert("IE: "+cleanedHash+" "+stackedHash);
				jQuery.historyCallback(stackedHash,true);
				
			}
		} else if (jQuery.browser.safari) {
			if(jQuery.lastHistoryLength == history.length && jQuery.historyBackStack.length > jQuery.lastHistoryLength) {
				jQuery.historyBackStack.shift();
			}
			if (!jQuery.dontCheck) {
				var historyDelta = history.length - jQuery.historyBackStack.length;
				jQuery.lastHistoryLength = history.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.replace(/\?.*$/, '');
						var stackedHash = jQuery.historyHashStack[cachedHash];
						//alert("Check 1 SAFARI: "+cachedHash+" "+stackedHash);
						jQuery.historyCallback(cachedHash,true);
					}
				} 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 (location.hash) {
						var current_hash = location.hash;
						
						var cleanedHash = location.hash.replace(/^#/, '');
						var stackedHash = jQuery.historyHashStack[cleanedHash];
						//alert("Check 2 SAFARI: "+cleanedHash+" "+stackedHash);
						jQuery.historyCallback(stackedHash,true);
					} else {
						var current_hash = '';
						//alert("Check 3 SAFARI: EMPTY");
						jQuery.historyCallback('',true);
					}
					jQuery.isFirst = true;
				}
			}
		} else {
			// otherwise, check for location.hash
			var current_hash = location.hash.replace(/\?.*$/, '');
			
			if(current_hash != jQuery.historyCurrentHash) {
				//alert("check hash : "+current_hash+" "+jQuery.historyCurrentHash);
				jQuery.historyCurrentHash = current_hash;
				var cleanedHash = current_hash.replace(/^#/, '');
				var stackedHash = jQuery.historyHashStack[cleanedHash];
				//alert("Check FF : "+cleanedHash+" "+stackedHash);
				jQuery.historyCallback(stackedHash,true);
			}
		}
	},
	historyLoad: function(hash){
		var newhash;
		hash = decodeURIComponent(hash.replace(/\?.*$/, ''));

		var hashObject = JSON.parse(hash);
		if (jQuery.browser.safari) {
			newhash = hash;
			//hashId = podz_hash(newhash); // EZPOD
			hashId = hashObject.url;
			jQuery.historyHashStack[hashId] = newhash;		 // EZPOD	
			//alert("SAFARI Stack :"+hashId+" >> "+newhash);
		}
		else {
			newhash = '#' + hash;
			
			//hashId = podz_hash(newhash); // EZPOD
			hashId = hashObject.url;
			//alert("change location :"+hashId);
			jQuery.historyHashStack[hashId] = newhash;	 // EZPOD
			//location.hash = newhash;			
			location.hash = hashId; // EZPOD
			//alert("changed");
		}
		//jQuery.historyCurrentHash = newhash;
		jQuery.historyCurrentHash = "#"+hashId;
		
		if (jQuery.historyNeedIframe) {
			var ihistory = jQuery("#jQuery_history")[0];
			var iframe = ihistory.contentWindow.document;
			iframe.open();
			iframe.close();
			//iframe.location.hash = newhash;
			iframe.location.hash = hashId; // EZPOD
			jQuery.lastHistoryLength = history.length;
			//alert("IE : "+hash);
			
			//NOW jQuery.historyCallback(hash);
		}
		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);
			//alert("load SAFARI : "+hash);
			jQuery.historyCallback(hash,true);
			// 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;
			
			//NOW location.hash = hashId; // EZPOD
		}
		else {
			//alert("Load FF : "+hash);
		  //NOW jQuery.historyCallback(hash,true);
		}
	}
});