/*
 * 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,
	
	historyInit: function(callback, src){
		jQuery.historyCallback = callback;
		if (src) jQuery.historyIframeSrc = src;
		var current_hash = location.hash.replace(/\?.*$/, '');
		
		jQuery.historyCurrentHash = current_hash;
		// if ((jQuery.browser.msie) && (jQuery.browser.version < 8)) {
		if (jQuery.browser.msie) {
			// 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;"'+
				(jQuery.historyIframeSrc ? ' src="'+jQuery.historyIframeSrc+'"' : '')
				+'></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)
			jQuery.historyCallback(current_hash.replace(/^#/, ''));
		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.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.contentDocument || ihistory.contentWindow.document;
			var current_hash = iframe.location.hash.replace(/\?.*$/, '');
			if(current_hash != jQuery.historyCurrentHash) {
			
				location.hash = current_hash;
				jQuery.historyCurrentHash = current_hash;
				jQuery.historyCallback(current_hash.replace(/^#/, ''));
				
			}
		} 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(/\?.*$/, '');
						jQuery.historyCallback(cachedHash);
					}
				} else if (jQuery.historyBackStack[jQuery.historyBackStack.length - 1] == undefined && !jQuery.isFirst) {
					// back button has been pushed to beginning and URL already pointed to hash (e.g. a bookmark)
					// document.URL doesn't change in Safari
					if (location.hash) {
						var current_hash = location.hash;
						jQuery.historyCallback(location.hash.replace(/^#/, ''));
					} else {
						var current_hash = '';
						jQuery.historyCallback('');
					}
					jQuery.isFirst = true;
				}
			}
		} else {
			// otherwise, check for location.hash
			var current_hash = location.hash.replace(/\?.*$/, '');
			if(current_hash != jQuery.historyCurrentHash) {
				jQuery.historyCurrentHash = current_hash;
				jQuery.historyCallback(current_hash.replace(/^#/, ''));
			}
		}
	},
	historyLoad: function(hash){
		var newhash;
		hash = decodeURIComponent(hash.replace(/\?.*$/, ''));
		
		if (jQuery.browser.safari) {
			newhash = hash;
		}
		else {
			newhash = '#' + hash;
			location.hash = newhash;
		}
		jQuery.historyCurrentHash = newhash;
		
		// if ((jQuery.browser.msie) && (jQuery.browser.version < 8)) {
		if (jQuery.browser.msie) {
			var ihistory = jQuery("#jQuery_history")[0];
			var iframe = ihistory.contentWindow.document;
			iframe.open();
			iframe.close();
			iframe.location.hash = newhash;
			jQuery.lastHistoryLength = history.length;
			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);
			jQuery.historyCallback(hash);
			// 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);
		}
	}
});

// FIN DE CONTROL DE HISTORY

// PageLoad function
// This function is called when:
// 1. after calling $.historyInit();
// 2. after calling $.historyLoad();
// 3. after pushing "Go Back" button of a browser
function CargarPagina(hash) {
	// alert("pageload: " + hash);
	// hash doesn't contain the first # character.
	if(hash) {
		// restore ajax loaded state
		if($.browser.msie) {
			// jquery's $.load() function does't work when hash include special characters like едц.
			//hash = encodeURIComponent(hash);
		}
		$.ajax({
				url: hash ,
				async:false,
				beforeSend: function(objeto){
					//$("#registros").hide() ;
					//$("#cargando").show();  
				},
				complete: function(objeto, exito){
					if(exito=="success"){
					}
				},
				contentType: "application/x-www-form-urlencoded",
				//dataType: "html",
				error: function(objeto, quepaso, otroobj){
				},
				global: true,
				ifModified: false,
				processData:true,
				success: function(datos){
					//$("#cargando").hide();
					//$("#registros").show() ;
					$("#resultado").html(datos);
					$("a[rel='history']").click(function(){
						// 
						var hash = this.href;
						hash = hash.replace(/^.*#/, '');
						// moves to a new page. 
						// pageload is called at once. 
						// hash don't contain "#", "?"
						$.historyLoad(hash);
						return false;
					});
				},
				timeout: 3000,
				data:"",
				type: "GET"
		});	
		return false;
	} else {
		// start page
		$("#resultado").empty();
	}
}

$(document).ready(function(){
	// Initialize history plugin.
	// The callback is called at once by present location.hash. 
	$.historyInit(CargarPagina, "");
	
	// set onlick event for buttons
	$("a[rel='history']").click(function(){
		// 
		var hash = this.href;
		hash = hash.replace(/^.*#/, '');
		// moves to a new page. 
		// pageload is called at once. 
		// hash don't contain "#", "?"
		$.historyLoad(hash);
		return false;
	});
	$("select[rel='history']").change(function(){
		// 
		var cmb_i = this.selectedIndex ;
		var cmb_value = this[cmb_i].value ;	
		var hash = cmb_value;
		hash = hash.replace(/^.*#/, '');
		// moves to a new page. 
		// pageload is called at once. 
		// hash don't contain "#", "?"
		$.historyLoad(hash);
		return false;
	});
});

function CargarInicio(url) {
	if (url != "") {
		CargarPagina(url) ;
	}
}	

$(document).ready(function(){
	$("a[rel='external']").click(function(){	
		this.target = "_blank";
	});
});