/*
 * jQuery history plugin
 *
 * Copyright (c) 2006 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.
 * API rewrite by Lauris Buk�is-Haberkorns
 */

(function($) {

function History()
{
	this._curHash = '';
	this._callback = function(hash,divId){};
};

$.extend(History.prototype, {

	init: function(callback) {
		this._callback = callback;

		if ( location.hash.length == 0 ) {
			location.hash = 'main';
		}
		this._curHash = location.hash;

		if($.browser.msie) {
			// To stop the callback firing twice during initilization if no hash present
			if (this._curHash == '') {
				this._curHash = '#';
			}

			// add hidden iframe for IE
			$("body").prepend('<iframe id="jQuery_history" style="display: none;"></iframe>');
			var iframe = $("#jQuery_history")[0].contentWindow.document;
			iframe.open();
			iframe.close();
			iframe.location.hash = this._curHash;
		}
		this._callback(this._curHash.replace(/^#/, ''));
		setInterval(this._check, 100);
	},

	add: function(hash) {
		// This makes the looping function do something
		this._historyBackStack.push(hash);
		
		this._historyForwardStack.length = 0; // clear forwardStack (true click occured)
		this._isFirst = true;
	},
	
	_check: function() {
		if($.browser.msie) {
			
			/*Возвращаемся после принудительной смены УРЛа
			if ( location.pathname == '//' ) {
				location.replace(gl_addr + location.hash);
			}*/
			
			// On IE, check for location.hash of iframe
			var ihistory = $("#jQuery_history")[0];
			var iframe = ihistory.contentDocument || ihistory.contentWindow.document;
			var current_hash = iframe.location.hash;
			var current_hash1 = location.hash;
			
			if(current_hash != $.history._curHash) {
				location.hash = current_hash;
				$.history._curHash = current_hash;
				$.history._callback(current_hash.replace(/^#/, ''));
			}
			//Если пользователь принудительно вписал УРЛ в адресную строку - производим перезагрузку
			else if (current_hash1 != $.history._curHash ) {
				iframe.location.hash = current_hash1;
			}
		} else {
			// otherwise, check for location.hash
			var current_hash = location.hash;
			if(current_hash != $.history._curHash) {
				$.history._curHash = current_hash;
				$.history._callback(current_hash.replace(/^#/, ''));
			}
		}
	},

	load: function(hash,divId) {
		var newhash;
		
		newhash = '#' + hash;
		location.hash = newhash;
		
		this._curHash = newhash;
		
		if ($.browser.msie) {

			var ihistory = $("#jQuery_history")[0]; // TODO: need contentDocument?
			var iframe = ihistory.contentWindow.document;
			iframe.open();
			iframe.close();
			iframe.location.hash = newhash;
			this._callback(hash,divId);
		}
		else {
		  this._callback(hash,divId);
		}
	}
});

$(document).ready(function() {
	$.history = new History(); // singleton instance
});

})(jQuery);