fum.util.Connect =
{
	_msxml_progid:[
		'MSXML2.XMLHTTP.5.0','MSXML2.XMLHTTP.4.0','MSXML2.XMLHTTP.3.0','MSXML2.XMLHTTP','Microsoft.XMLHTTP'],
	_http_headers:{},
	_has_http_headers:false,
    _use_default_post_header:true,
    _default_post_header:'application/x-www-form-urlencoded; charset=UTF-8',
    _default_form_header:'application/x-www-form-urlencoded',
    _use_default_xhr_header:true,
    _default_xhr_header:'XMLHttpRequest',
    _has_default_headers:true,
    _default_headers:{},
    _isFormSubmit:false,
    _isFileUpload:false,
    _formNode:null,
    _sFormData:null,
    _poll:{},
    _timeOut:{},
     _polling_interval:50,
     _transaction_id:0,
	 _submitElementValue:null,
   _customEvents:
	{
		onStart:['startEvent', 'start'],
		onComplete:['completeEvent', 'complete'],
		onSuccess:['successEvent', 'success'],
		onFailure:['failureEvent', 'failure'],
		onUpload:['uploadEvent', 'upload'],
		onAbort:['abortEvent', 'abort']
	},
	setProgId:function(id)
	{
		this._msxml_progid.unshift(id);
	},
	setDefaultPostHeader:function(b)
	{
		if(typeof b == 'string'){
			this._default_post_header = b;
		}
		else if(typeof b == 'boolean'){
			this._use_default_post_header = b;
		}
	},
	setDefaultXhrHeader:function(b)
	{
		if(typeof b == 'string'){
			this._default_xhr_header = b;
		}
		else{
			this._use_default_xhr_header = b;
		}
	},
	setPollingInterval:function(i)
	{
		if(typeof i == 'number' && isFinite(i)){
			this._polling_interval = i;
		}
	},
	createXhrObject:function(transactionId)
	{
		var obj,http;
		try
		{
			http = new XMLHttpRequest();
			obj = { conn:http, tId:transactionId };
		}
		catch(e)
		{
			for(var i=0; i<this._msxml_progid.length; ++i){
				try
				{
					http = new ActiveXObject(this._msxml_progid[i]);
					obj = { conn:http, tId:transactionId };
					break;
				}
				catch(e){}
			}
		}
		finally
		{
			return obj;
		}
	},
 	getConnectionObject:function(isFileUpload)
	{
		var o;
		var tId = this._transaction_id;
		try
		{
			if(!isFileUpload){
				o = this.createXhrObject(tId);
			}
			else{
				o = {};
				o.tId = tId;
				o.isUpload = true;
			}

			if(o){
				this._transaction_id++;
			}
		}
		catch(e){}
		finally
		{
			return o;
		}
	},
	asyncRequest:function(method, uri, callback, postData)
	{  
		var o = (this._isFileUpload)?this.getConnectionObject(true):this.getConnectionObject();
		var args = (callback && callback.argument)?callback.argument:null;

		if(!o){
			return null;
		}
		else{

			if(callback && callback.customevents){
				this.initCustomEvents(o, callback);
			}

			if(this._isFormSubmit){
				if(this._isFileUpload){
					this.uploadFile(o, callback, uri, postData);
					return o;
				}
				if(method.toUpperCase() == 'GET'){
					if(this._sFormData.length !== 0){
						uri += ((uri.indexOf('?') == -1)?'?':'&') + this._sFormData;
					}
				}
				else if(method.toUpperCase() == 'POST'){
					
					postData = postData?this._sFormData + "&" + postData:this._sFormData;
				}
			}

			if(method.toUpperCase() == 'GET' && (callback && callback.cache === false)){
				uri += ((uri.indexOf('?') == -1)?'?':'&') + "rnd=" + new Date().valueOf().toString();
			}

			o.conn.open(method, uri, true);
			if(this._use_default_xhr_header){
				if(!this._default_headers['X-Requested-With']){
					this.initHeader('X-Requested-With', this._default_xhr_header, true);
				}
			}

			if((method.toUpperCase() == 'POST' && this._use_default_post_header) && this._isFormSubmit === false){
				this.initHeader('Content-Type', this._default_post_header);
			}
			if(this._has_default_headers || this._has_http_headers){
				this.setHeader(o);
			}

			this.handleReadyState(o, callback);
			o.conn.send(postData || null);
			if(this._isFormSubmit === true){
				this.resetFormState();
			}
			return o;
		}
	},
    handleReadyState:function(o, callback)

    {    
		var oConn = this;
		var args = (callback && callback.argument)?callback.argument:null;

		if(callback && callback.timeout){
			this._timeOut[o.tId] = window.setTimeout(function(){ oConn.abort(o, callback, true); }, callback.timeout);
		}

		this._poll[o.tId] = window.setInterval(
			function(){
				if(o.conn && o.conn.readyState === 4){

					window.clearInterval(oConn._poll[o.tId]);
					delete oConn._poll[o.tId];

					if(callback && callback.timeout){
						window.clearTimeout(oConn._timeOut[o.tId]);
						delete oConn._timeOut[o.tId];
					}
					oConn.handleTransactionResponse(o, callback);
				}
			}
		,this._polling_interval);
    },
    handleTransactionResponse:function(o, callback, isAbort)
    {
		var httpStatus, responseObject;
		var args = (callback && callback.argument)?callback.argument:null;

		try
		{
			if(o.conn.status !== undefined && o.conn.status !== 0){
				httpStatus = o.conn.status;
			}
			else{
				httpStatus = 13030;
			}
		}
		catch(e){

			httpStatus = 13030;
		}

		if(httpStatus >= 200 && httpStatus < 300 || httpStatus === 1223){
			responseObject = this.createResponseObject(o, args);
			if(callback && callback.success){
				if(!callback.scope){
					callback.success(responseObject);
				}
				else{
					callback.success.apply(callback.scope, [responseObject]);
				}
			}

		}
		else{
			switch(httpStatus){
				case 12002: // Server timeout
				case 12029: // 12029 to 12031 correspond to dropped connections.
				case 12030:
				case 12031:
				case 12152: // Connection closed by server.
				case 13030: // See above comments for variable status.
					responseObject = this.createExceptionObject(o.tId, args, (isAbort?isAbort:false));
					if(callback && callback.failure){
						if(!callback.scope){
							callback.failure(responseObject);
						}
						else{
							callback.failure.apply(callback.scope, [responseObject]);
						}
					}

					break;
				default:
					responseObject = this.createResponseObject(o, args);
					if(callback && callback.failure){
						if(!callback.scope){
							callback.failure(responseObject);
						}
						else{
							callback.failure.apply(callback.scope, [responseObject]);
						}
					}
			}
		}

		this.releaseObject(o);
		responseObject = null;
    },
    createResponseObject:function(o, callbackArg)
    {
		var obj = {};
		var headerObj = {};

		try
		{
			var headerStr = o.conn.getAllResponseHeaders();
			var header = headerStr.split('\n');
			for(var i=0; i<header.length; i++){
				var delimitPos = header[i].indexOf(':');
				if(delimitPos != -1){
					headerObj[header[i].substring(0,delimitPos)] = header[i].substring(delimitPos+2);
				}
			}
		}
		catch(e){}

		obj.tId = o.tId;
		obj.status = (o.conn.status == 1223)?204:o.conn.status;
		obj.statusText = (o.conn.status == 1223)?"No Content":o.conn.statusText;
		obj.getResponseHeader = headerObj;
		obj.getAllResponseHeaders = headerStr;
		obj.responseText = o.conn.responseText;
		obj.responseXML = o.conn.responseXML;

		if(callbackArg){
			obj.argument = callbackArg;
		}

		return obj;
    },
    createExceptionObject:function(tId, callbackArg, isAbort)
    {
		var COMM_CODE = 0;
		var COMM_ERROR = 'communication failure';
		var ABORT_CODE = -1;
		var ABORT_ERROR = 'transaction aborted';

		var obj = {};

		obj.tId = tId;
		if(isAbort){
			obj.status = ABORT_CODE;
			obj.statusText = ABORT_ERROR;
		}
		else{
			obj.status = COMM_CODE;
			obj.statusText = COMM_ERROR;
		}

		if(callbackArg){
			obj.argument = callbackArg;
		}

		return obj;
    },
	initHeader:function(label, value, isDefault)
	{
		var headerObj = (isDefault)?this._default_headers:this._http_headers;
		headerObj[label] = value;

		if(isDefault){
			this._has_default_headers = true;
		}
		else{
			this._has_http_headers = true;
		}
	},
	hasOwnProperty: function(o, prop) {
        if (Object.prototype.hasOwnProperty) {
            return o.hasOwnProperty(prop);
        }
        
        return !fum.util.Connect.isUndefined(o[prop]) && 
                o.constructor.prototype[prop] !== o[prop];
    },
	isUndefined: function(o) {
        return typeof o === 'undefined';
    },
	setHeader:function(o)
	{
		if(this._has_default_headers){
			for(var prop in this._default_headers){
				if(fum.util.Connect.hasOwnProperty(this._default_headers, prop)){
					o.conn.setRequestHeader(prop, this._default_headers[prop]);
				}
			}
		}

		if(this._has_http_headers){
			for(var prop in this._http_headers){
				if(fum.util.Connect.hasOwnProperty(this._http_headers, prop)){
					o.conn.setRequestHeader(prop, this._http_headers[prop]);
				}
			}
			delete this._http_headers;

			this._http_headers = {};
			this._has_http_headers = false;
		}
	},
	resetDefaultHeaders:function(){
		delete this._default_headers;
		this._default_headers = {};
		this._has_default_headers = false;
	},
	setForm:function(formId, isUpload, secureUri)
	{
		this.resetFormState();
		var oForm;
		if(typeof formId == 'string'){
		}
		else if(typeof formId == 'object'){
			oForm = formId;
		}
		else{
			return;
		}
		if(isUpload){
			var io = this.createFrame(secureUri?secureUri:null);
			this._isFormSubmit = true;
			this._isFileUpload = true;
			this._formNode = oForm;
			return;
		}
		var oElement, oName, oValue, oDisabled;
		var hasSubmit = false;
		for (var i=0; i<oForm.elements.length; i++){
			oElement = oForm.elements[i];
			oDisabled = oElement.disabled;
			oName = oElement.name;
			oValue = oElement.value;
			if(!oDisabled && oName)
			{
				switch(oElement.type)
				{
					case 'select-one':
					case 'select-multiple':
						for(var j=0; j<oElement.options.length; j++){
							if(oElement.options[j].selected){
								if(window.ActiveXObject){
									this._sFormData += encodeURIComponent(oName) + '=' + encodeURIComponent(oElement.options[j].attributes['value'].specified?oElement.options[j].value:oElement.options[j].text) + '&';
								}
								else{
									this._sFormData += encodeURIComponent(oName) + '=' + encodeURIComponent(oElement.options[j].hasAttribute('value')?oElement.options[j].value:oElement.options[j].text) + '&';
								}
							}
						}
						break;
					case 'radio':
					case 'checkbox':
						if(oElement.checked){
							this._sFormData += encodeURIComponent(oName) + '=' + encodeURIComponent(oValue) + '&';
						}
						break;
					case 'file':
					case undefined:
					case 'reset':
					case 'button':
						break;
					case 'submit':
						if(hasSubmit === false){
							if(this._hasSubmitListener && this._submitElementValue){
								this._sFormData += this._submitElementValue + '&';
							}
							else{
								this._sFormData += encodeURIComponent(oName) + '=' + encodeURIComponent(oValue) + '&';
							}

							hasSubmit = true;
						}
						break;
					default:
						this._sFormData += encodeURIComponent(oName) + '=' + encodeURIComponent(oValue) + '&';
				}
			}
		}

		this._isFormSubmit = true;
		this._sFormData = this._sFormData.substr(0, this._sFormData.length - 1);
		this.initHeader('Content-Type', this._default_form_header);
		return this._sFormData;
	},
	resetFormState:function(){
		this._isFormSubmit = false;
		this._isFileUpload = false;
		this._formNode = null;
		this._sFormData = "";
	},
	createFrame:function(secureUri){
		var frameId = 'yuiIO' + this._transaction_id;
		var io;
		if(window.ActiveXObject){
			io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');
			if(typeof secureUri == 'boolean'){
				io.src = 'javascript:false';
			}
			else if(typeof secureURI == 'string'){
				io.src = secureUri;
			}
		}
		else{
			io = document.createElement('iframe');
			io.id = frameId;
			io.name = frameId;
		}

		io.style.position = 'absolute';
		io.style.top = '-1000px';
		io.style.left = '-1000px';

		document.body.appendChild(io);
	},
 	appendPostData:function(postData)
	{
		var formElements = [];
		var postMessage = postData.split('&');
		for(var i=0; i < postMessage.length; i++){
			var delimitPos = postMessage[i].indexOf('=');
			if(delimitPos != -1){
				formElements[i] = document.createElement('input');
				formElements[i].type = 'hidden';
				formElements[i].name = postMessage[i].substring(0,delimitPos);
				formElements[i].value = postMessage[i].substring(delimitPos+1);
				this._formNode.appendChild(formElements[i]);
			}
		}

		return formElements;
	},

 	uploadFile:function(o, callback, uri, postData){
		var oConn = this;
		var frameId = 'yuiIO' + o.tId;
		var uploadEncoding = 'multipart/form-data';
		var io = document.getElementById(frameId);
		var args = (callback && callback.argument)?callback.argument:null;
		var rawFormAttributes =
		{
			action:this._formNode.getAttribute('action'),
			method:this._formNode.getAttribute('method'),
			target:this._formNode.getAttribute('target')
		};
		this._formNode.setAttribute('action', uri);
		this._formNode.setAttribute('method', 'POST');
		this._formNode.setAttribute('target', frameId);

		if(this._formNode.encoding){
			this._formNode.setAttribute('encoding', uploadEncoding);
		}
		else{
			this._formNode.setAttribute('enctype', uploadEncoding);
		}

		if(postData){
			var oElements = this.appendPostData(postData);
		}
		this._formNode.submit();
		if(callback && callback.timeout){
			this._timeOut[o.tId] = window.setTimeout(function(){ oConn.abort(o, callback, true); }, callback.timeout);
		}
		if(oElements && oElements.length > 0){
			for(var i=0; i < oElements.length; i++){
				this._formNode.removeChild(oElements[i]);
			}
		}
		for(var prop in rawFormAttributes){
			if(YAHOO.lang.hasOwnProperty(rawFormAttributes, prop)){
				if(rawFormAttributes[prop]){
					this._formNode.setAttribute(prop, rawFormAttributes[prop]);
				}
				else{
					this._formNode.removeAttribute(prop);
				}
			}
		}
		this.resetFormState();
		var uploadCallback = function()
		{
			if(callback && callback.timeout){
				window.clearTimeout(oConn._timeOut[o.tId]);
				delete oConn._timeOut[o.tId];
			}
			var obj = {};
			obj.tId = o.tId;
			obj.argument = callback.argument;

			try
			{
				obj.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:io.contentWindow.document.documentElement.textContent;
				obj.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;
			}
			catch(e){}
			if(callback && callback.upload){
				if(!callback.scope){
					callback.upload(obj);
				}
				else{
					callback.upload.apply(callback.scope, [obj]);
				}
			}

			fum.util.Event.removeListener(io, "load", uploadCallback);
			setTimeout(
				function(){
					document.body.removeChild(io);
					oConn.releaseObject(o);
				}, 100);
		};
		fum.util.Event.addListener(io, "load", uploadCallback);
	},
	abort:function(o, callback, isTimeout)
	{
		var abortStatus;
		var args = (callback && callback.argument)?callback.argument:null;


		if(o && o.conn){
			if(this.isCallInProgress(o)){
				o.conn.abort();
				window.clearInterval(this._poll[o.tId]);
				delete this._poll[o.tId];
				if(isTimeout){
					window.clearTimeout(this._timeOut[o.tId]);
					delete this._timeOut[o.tId];
				}
				abortStatus = true;
			}
		}
		else if(o && o.isUpload === true){
			var frameId = 'yuiIO' + o.tId;
			var io = document.getElementById(frameId);

			if(io){
				fum.util.Event.removeListener(io, "load");
				document.body.removeChild(io);
				if(isTimeout){
					window.clearTimeout(this._timeOut[o.tId]);
					delete this._timeOut[o.tId];
				}
				abortStatus = true;
			}
		}
		else{
			abortStatus = false;
		}

		if(abortStatus === true){
			this.handleTransactionResponse(o, callback, true);
		}
		return abortStatus;
	},
	isCallInProgress:function(o)
	{
		if(o && o.conn){
			return o.conn.readyState !== 4 && o.conn.readyState !== 0;
		}
		else if(o && o.isUpload === true){
			var frameId = 'yuiIO' + o.tId;
			return document.getElementById(frameId)?true:false;
		}
		else{
			return false;
		}
	},
	releaseObject:function(o)
	{
		if(o && o.conn){
			o.conn = null;
			o = null;
		}
	}
};