/*
	$Id: ajax.js 8888 2008-09-16 01:01:32Z brad $

	This file is part of ayudaCMS
	Copyright 2007: ayuda IT
	http://www.ayuda.com.au

	For licencing details, please see LICENCE.txt in the ayudaCMS directory.
*/

/**
 * Usage:
 *
 * var ajax = new AJAX(callback, callbackArgs);
 * ajax.request(url);
 *
 * var sjax = new SJAX();
 * var xml = sjax.request(url);
 */

/*************************************************************************/
/** Base "AJAX" class													**/
/*************************************************************************/

function JAX()
{
	this.synchronous = false;
	this.method = "GET";
	this.payload = null;
	this.xmlHTTPRequest = this.makeXMLHTTPRequest();
	this.responseFormat = "XML";
}


/** 
 * Is the ajax call synchronous (blocking)
 */

JAX.prototype.isSynchronous = function()
{
	return this.synchronous;
}


/** 
 * Set the POST payload
 */

JAX.prototype.setPayload = function(value)
{
	this.payload = value;
}


/**
 * Return the POST payload
 */

JAX.prototype.getPayload = function()
{
	return this.payload;
}


/** 
 * In what format should I expect the response
 */

JAX.prototype.setResponseFormat = function(value)
{
	this.responseFormat = value;
}

/** 
 * Set the data method
 */

JAX.prototype.setMethod = function(value)
{
	this.method = value;
}


/**
 * Return the data method
 */

JAX.prototype.getMethod = function()
{
	return this.method;
}


/**
 * Create the XMLHttpRequest object
 */

JAX.prototype.makeXMLHTTPRequest = function() 
{
	if (window.XMLHttpRequest)  	// Most normal people
	{ 
		return xmlHTTPRequest = new XMLHttpRequest();
	} 
	else if (window.ActiveXObject)  // IE 6
	{
		return xmlHTTPRequest = new ActiveXObject("Microsoft.XMLHTTP");
	}
	else
	{
		return null;
	}
}


/**
 * Return name value pairs of the form data
 */

JAX.prototype.getPayloadFromForm = function(id, button)
{
	var element = document.getElementById(id);
	var data = "";

	if(element)
	{
		for(i = 0; i < element.childNodes.length; i++)
		{
			if(element.childNodes[i].nodeName == "FIELDSET")
			{
				for(j = 0; j < element.childNodes[i].childNodes.length; j++)
				{
					var nodeName = element.childNodes[i].childNodes[j].nodeName;
					var type = element.childNodes[i].childNodes[j].type;

					if((nodeName == "TEXTAREA") || 
					   ((nodeName == "INPUT") && (type == "text")))
					{
						var value = element.childNodes[i].childNodes[j].value;
						var name = element.childNodes[i].childNodes[j].name;

						if(data != "")
						{
							data += "&";
						}
						data += name + "=" + value;
					}
					else if((nodeName == "INPUT") && (type == "submit"))
					{
						var value = element.childNodes[i].childNodes[j].value;
						var name = element.childNodes[i].childNodes[j].name;

						if(name == button)
						{
							if(data != "")
							{
								data += "&";
							}
							data += name + "=" + value;
						}
					}
				}
			}
		}
	}
	return data;
}


/*************************************************************************/
/** Asynchronous "AJAX"													**/
/*************************************************************************/

function AJAX(callback, callbackArgs)
{
	this.callback = callback;
	if(!callbackArgs)
	{
		callbackArgs = new Array();
	}

	this.callbackArgs = callbackArgs;
}

AJAX.prototype = new JAX;


/** 
 * Set the callback function
 */

AJAX.prototype.setCallback = function(value)
{
	this.callback = value;
}


/** 
 * Set the callback arguments
 */

AJAX.prototype.setCallbackArgs = function(value)
{
	this.callbackArgs = value;
}

/**
 * Make the request, this function will call the callback function 
 * with the given args when the request is completed
 */

AJAX.prototype.request = function(url)
{
	if(this.xmlHTTPRequest)
	{
		var callback = this.callback;
		var callbackArgs = this.callbackArgs;
		var xmlHTTPRequest = this.xmlHTTPRequest;
		var responseFormat = this.responseFormat;

		try
		{
			this.xmlHTTPRequest.open(this.method, url, !this.synchronous);
		}
		catch(e)
		{
			return;
		}
		this.xmlHTTPRequest.onreadystatechange = function()
		{
			AJAX.prototype.processStateChange(xmlHTTPRequest, callback, callbackArgs, responseFormat);
		}

		try
		{
			if(this.method == "POST")
			{
				this.xmlHTTPRequest.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
				this.xmlHTTPRequest.setRequestHeader("Content-length", this.payload.length);
				this.xmlHTTPRequest.setRequestHeader("Connection", "close");
					this.xmlHTTPRequest.send(this.payload);
			}
			else
			{
				this.xmlHTTPRequest.send(null);
			}
		}
		catch(e)
		{
			return;
		}
	}
}


/**
 * Function called when the state of the request changes. Calls the callback 
 * function on successful completion of the request
 */

AJAX.prototype.processStateChange = function(xmlHTTPRequest, callback, callbackArgs, responseFormat)  
{
	if(xmlHTTPRequest)
	{
		if (xmlHTTPRequest.readyState == 4)  	// Request complete
		{
			try 
			{
				if (xmlHTTPRequest.status == 200) 	// OK response
				{
					if(callback)
					{
						if(responseFormat == "XML")
						{
							callbackArgs['response'] = xmlHTTPRequest.responseXML;
						}
						else if((responseFormat = "XHTML") || (responseFormat = "JSON"))
						{
							callbackArgs['response'] = xmlHTTPRequest.responseText;
						}

						callback(callbackArgs);
					}
				}
			}
			catch(e)
			{
				return;
			}
		}
	}
}


/*************************************************************************/
/** Synchronous "AJAX"													**/
/*************************************************************************/

function SJAX()
{
	this.synchronous = true;
}

SJAX.prototype = new JAX;


/**
 * Make the request, this function will return the XML document of the response
 */

SJAX.prototype.request = function(url)
{
	if(this.xmlHTTPRequest)
	{
		try
		{
			this.xmlHTTPRequest.open(this.method, url, !this.synchronous);
		}
		catch(e)
		{
			return null;
		}
		if(this.method == "POST")
		{
			this.xmlHTTPRequest.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
			this.xmlHTTPRequest.setRequestHeader("Content-length", this.payload.length);
			this.xmlHTTPRequest.setRequestHeader("Connection", "close");
			this.xmlHTTPRequest.send(this.payload);
		}
		else
		{
			this.xmlHTTPRequest.send(null);
		}
		
		if((this.responseFormat == "XML") && this.xmlHTTPRequest.responseXML)
		{
			return this.xmlHTTPRequest.responseXML;
		}
		else if(((this.responseFormat == "XHTML") || (this.responseFormat == "JSON")) && this.xmlHTTPRequest.responseText)
		{
			return this.xmlHTTPRequest.responseText;
		}
		else
		{
			return null;
		}
	}
}


/*************************************************************************/
/** Synchronous "AJAJ"													**/
/*************************************************************************/

function SJAJ()
{
	this.synchronous = true;
	this.responseFormat = "JSON";
}

SJAJ.prototype = new SJAX;


/**
 * Helper function to make a synchronous AJAJ request
 */

function syncRequest(url, payload)
{
	var sjaj = new SJAJ();
	if(payload)
	{
		sjaj.setMethod("POST");
		sjaj.setPayload(payload);
	}

	return sjaj.request(url);
}

/*************************************************************************/
/** Asynchronous "AJAJ"													**/
/*************************************************************************/

function AJAJ(callback, callbackArgs)
{
	this.callback = callback;
	if(!callbackArgs)
	{
		callbackArgs = new Array();
	}

	this.callbackArgs = callbackArgs;
	this.responseFormat = "JSON";
}

AJAJ.prototype = new AJAX;


/**
 * Helper function to make an asynchronous AJAJ request
 */

function asyncRequest(url, callback, callbackArgs, payload)
{
	var ajaj = new AJAJ(callback, callbackArgs);
	if(payload)
	{
		ajaj.setMethod("POST");
		ajaj.setPayload(payload);
	}

	ajaj.request(url);
}


/*************************************************************************/
/** XML Utility class													**/
/*************************************************************************/

function XMLUtils() {}

/**
 * Return the root element of an XML response
 */

XMLUtils.prototype.getRootElement = function(response, tagName)
{	
	if(response)
	{
		response = response.documentElement;

		if(response)
		{
			return response;
		}
	}
	return null;
}


/**
 * Return the value of of an object with the given tag name and parent reference
 */

XMLUtils.prototype.getElementValue = function(parentElement, tagName)
{
	if(parentElement)
	{
		var elements = parentElement.getElementsByTagName(tagName);

		if(elements)
		{
			var element = elements[0];
			if(element)
			{
				var elementValue = "";
				for(i = 0; i < element.childNodes.length; i++)
				{
					elementValue += element.childNodes[i].nodeValue;
				}
				return elementValue;
			}
		}
	}
	return null;
}


/**
 * Return the list of the children of a particular element
 */

XMLUtils.prototype.getElementValues = function(parentElement, tagName)
{
	var elementsArray = new Array();
	if(parentElement)
	{
		var elements = parentElement.getElementsByTagName(tagName);

		if(elements)
		{
			var element = elements[0];
			if(element)
			{
				for(i = 0; i < element.childNodes.length; i++)
				{
					if(element.childNodes[i].nodeName != "#text")
					{
						var elementArray = new Array();

						for(j = 0; j < element.childNodes[i].childNodes.length; j++)
						{
							if(element.childNodes[i].childNodes[j].nodeName != "#text")
							{
								if(element.childNodes[i].childNodes[j].nodeName != "")
								{
									var elementValue = "";
									for(k = 0; k < element.childNodes[i].childNodes[j].childNodes.length; k++)
									{
										elementValue += element.childNodes[i].childNodes[j].childNodes[k];
									}
									elementArray[element.childNodes[i].childNodes[j].nodeName] = elementValue;
								}
							}
						}
						elementsArray[elementsArray.length] = elementArray;
					}
				}
			}
		}
	}
	return elementsArray;
}


/*************************************************************************/
/** Base64 Util class													**/
/**																		**/ 
/** Adapted from http://www.webtoolkit.info/javascript-base64.html		**/
/*************************************************************************/

function Base64Utils() {}

Base64Utils.prototype.keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

Base64Utils.prototype.encode =  function (input) 
{
	var output = "";
	var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
	var i = 0;

	input = Base64Utils.prototype.utf8_encode(input);

	while(i < input.length)
	{
		chr1 = input.charCodeAt(i++);
		chr2 = input.charCodeAt(i++);
		chr3 = input.charCodeAt(i++);

		enc1 = chr1 >> 2;
		enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
		enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
		enc4 = chr3 & 63;

		if(isNaN(chr2))
		{
			enc3 = enc4 = 64;
		}
		else if (isNaN(chr3)) 
		{
			enc4 = 64;
		}

		output = output +
		Base64Utils.prototype.keyStr.charAt(enc1) + Base64Utils.prototype.keyStr.charAt(enc2) +
		Base64Utils.prototype.keyStr.charAt(enc3) + Base64Utils.prototype.keyStr.charAt(enc4);

	}

	return output;
}


Base64Utils.prototype.decode = function(input)
{
	var output = "";
	var chr1, chr2, chr3;
	var enc1, enc2, enc3, enc4;
	var i = 0;

	if(input) 
	{
		input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
	}
	else
	{
		input = "";
	}

	while(i < input.length)
	{
		enc1 = Base64Utils.prototype.keyStr.indexOf(input.charAt(i++));
		enc2 = Base64Utils.prototype.keyStr.indexOf(input.charAt(i++));
		enc3 = Base64Utils.prototype.keyStr.indexOf(input.charAt(i++));
		enc4 = Base64Utils.prototype.keyStr.indexOf(input.charAt(i++));

		chr1 = (enc1 << 2) | (enc2 >> 4);
		chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
		chr3 = ((enc3 & 3) << 6) | enc4;

		output = output + String.fromCharCode(chr1);

		if (enc3 != 64) 
		{
			output = output + String.fromCharCode(chr2);
		}
		if (enc4 != 64) 
		{
			output = output + String.fromCharCode(chr3);
		}

	}

	return Base64Utils.prototype.utf8_decode(output);
}


Base64Utils.prototype.utf8_encode = function (string) 
{
	string = string.replace(/\r\n/g,"\n");
	var utftext = "";

	for(var n = 0; n < string.length; n++) 
	{
		var c = string.charCodeAt(n);

		if (c < 128) 
		{
			utftext += String.fromCharCode(c);
		}
		else if((c > 127) && (c < 2048))
		{
			utftext += String.fromCharCode((c >> 6) | 192);
			utftext += String.fromCharCode((c & 63) | 128);
		}
		else
		{
			utftext += String.fromCharCode((c >> 12) | 224);
			utftext += String.fromCharCode(((c >> 6) & 63) | 128);
			utftext += String.fromCharCode((c & 63) | 128);
		}
	}

	return utftext;
}


Base64Utils.prototype.utf8_decode = function (utftext) 
{
	var string = "";
	var i = 0;
	var c = c1 = c2 = 0;

	while(i < utftext.length ) 
	{
		c = utftext.charCodeAt(i);

		if (c < 128) 
		{
			string += String.fromCharCode(c);
			i++;
		}
		else if((c > 191) && (c < 224)) 
		{
			c2 = utftext.charCodeAt(i+1);
			string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
			i += 2;
		}
		else 
		{
			c2 = utftext.charCodeAt(i+1);
			c3 = utftext.charCodeAt(i+2);
			string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
			i += 3;
		}
	}

	return string;
}