/*
Class: Ajax connectivity
*/

// Default constructor
function AjaxRequest(_action, _method, _async, _params) {
	// Properties	
	this.action = _action;
	this.method = _method;
	this.async = _async;
	this.params = _params;

	// Methods
	this.connect = AjaxRequest_connect;
	this.connectComet = AjaxRequest_connectComet;
	this.sanitizeToLastJson = AjaxRequest_sanitizeToLastJson;
	this.cancelRequest = AjaxRequest_cancelRequest;
}

// Connect method
function AjaxRequest_connect() {
	try {
		var _ref = this;
		this.request = window.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject("MSXML2.XMLHTTP.3.0");

		// Determine where get/post parameters go
		if(this.method == "GET" && this.params != null)
			this.request.open(this.method, this.action+"?"+encodeURI(this.params), this.async);
		else
			this.request.open(this.method, this.action, true);

		// Set content header for json
		this.request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");

		// Waiting for connect and set callback function
		this.request.onreadystatechange = function() {
			if(_ref.request.readyState == 4) {
				if(_ref.request.status == 200)
					_ref.callBack(_ref.request.responseText);
			}
		}

		// Send the request differently if there is POST data
		if(this.method == "POST" && this.params != null)
			this.request.send(this.params);
		else
			this.request.send(null);
		
		return true;
	} 
	catch (e) {
		window.alert(e);
		return false;
	}
}

// Comet data
function AjaxRequest_connectComet() {
	try {
		var _ref = this;
		this.request = window.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject("MSXML2.XMLHTTP.3.0");
		
		// Determine where get/post parameters go
		if(this.method == "GET" && this.params != null)
			this.request.open(this.method, this.action+"?"+encodeURI(this.params), this.async);
		else
			this.request.open(this.method, this.action, true);

		// Set content header for json
		this.request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");

		// Waiting for connect and set callback function
		this.request.onreadystatechange = function() {
			if(_ref.request.readyState == 3) {
				if (_ref.request.status == 200)
					_ref.callBack(_ref.request.responseText);
			}

			if(_ref.request.readyState == 4) {
				if (_ref.request.status == 200)
					_ref.callBack(_ref.request.responseText);
			}
		}

		// Send the request differently if there is POST data
		if(this.method == "POST" && this.params != null)
			this.request.send(this.params);
		else
			this.request.send(null);
		
		return true;
	} 
	catch (e) {
		return false;
	}
}

// This will sanitize a string to the last json message (useful for comet)
function AjaxRequest_sanitizeToLastJson(_string) {
	var string = _string;

	var lastIndexOfRightCurly = string.lastIndexOf("}");
	var lastIndexOfLeftCurly = string.lastIndexOf("{");

	return string.substring(lastIndexOfLeftCurly, lastIndexOfRightCurly+1);
}

// Cancel ajax request
function AjaxRequest_cancelRequest() {
	this.request.abort();
}