/**
 * HTTP 통신 클라이언트 클래스
 * 
 * @author kimjihwan
 */
function HttpClient()
{
	this.m_objHttpFactory;
	this.m_objHttpRequest;
};

HttpClient.prototype.status = function ()
{
	if (4 == this.m_objHttpRequest.readyState)
	{
		return this.m_objHttpRequest.status;
	}
	else
	{
		return null;
	}	
};

HttpClient.prototype.post = function (strURL, objData, bAsync, strContentsType, strEncoding, bMutipart, strBoundary)
{
	return this._sendHttpRequest("POST", strURL, objData, bAsync, strContentsType, strEncoding, bMutipart, strBoundary);
};

HttpClient.prototype.get = function (strURL, bAsync, strContentsType, strEncoding)
{
	return this._sendHttpRequest("GET", strURL, null, bAsync, strContentsType, strEncoding, false, null);
};

HttpClient.prototype.put = function (strURL, objData, bAsync, strContentsType, strEncoding)
{
	return this._sendHttpRequest("PUT", strURL, objData, bAsync, strContentsType, strEncoding, false, null);
};

HttpClient.prototype.deleteMethod = function (strURL, objData, bAsync, strContentsType, strEncoding)
{
	return this._sendHttpRequest("DELETE", strURL, objData, bAsync, strContentsType, strEncoding, false, null);
};

HttpClient.prototype._sendHttpRequest = function (strMethod, strURL, objData, bAsync, strContentsType, strEncoding, bMutipart, strBoundary)
{
	if (null == bAsync)
	{
		bAsync = false;
	}
	
	if (null == strContentsType || strContentsType.isEmpty())
	{
		strContentsType = "application/x-www-form-urlencoded";
	}
	
	if (null == strEncoding || strEncoding.isEmpty())
	{
		strEncoding = "UTF-8";
	}
	
	this.m_objHttpRequest = this._makeHttpRequest();
	
	if (bAsync)
	{
		this.m_objHttpRequest.onreadystatechange = HttpClient.handleASyncHttpResponse;
	}
	
	this.m_objHttpRequest.open(strMethod, strURL, bAsync);
	
	if (bMutipart)
	{
		this.m_objHttpRequest.setRequestHeader("Content-Type", strContentsType + "; boundary=" + strBoundary);
	}
	else
	{
		this.m_objHttpRequest.setRequestHeader("Content-Type", strContentsType + ";charset=UTF-8");	
	}
	
	this.m_objHttpRequest.send(objData);
	
	if (!bAsync)
	{
		return this._handleSyncHttpResponse(strURL);
	}
};

/**
 * 동기 모드일때 답신을 처리한다.
 * @return
 */
HttpClient.prototype._handleSyncHttpResponse = function (strURL)
{
	if (4 == this.m_objHttpRequest.readyState)
	{
		if (200 == this.m_objHttpRequest.status)
		{
			if("text/html" == this.m_objHttpRequest.getResponseHeader("Content-Type"))
			{
				// TODO redirect
			}
			else
			{
				if (null != window.console)
				{
					if (!is_smartphone)
					{
						if (null != window.console)
						{
							console.log(" Connect URL : " + strURL);
							console.log(" Connect STATUS : " + this.m_objHttpRequest.status);
							console.log(" Connect STATUS TEXT : " + this.m_objHttpRequest.statusText);				
						}	
					}
					else
					{
						if (null != window.console)
						{
							console.log(this.m_objHttpRequest.status + "," + this.m_objHttpRequest.statusText + "," + strURL);
						}	
					}	
				}	
				return this.m_objHttpRequest.responseText;
			}
		}
		else
		{
				if (!is_smartphone)
				{
					if (null != window.console)
					{
						console.log(" Connect URL : " + strURL);
						console.log(" Connect STATUS : " + this.m_objHttpRequest.status);
						console.log(" Connect STATUS TEXT : " + this.m_objHttpRequest.statusText);	
					}	
				}
				else
				{
					if (null != window.console)
					{
						console.log(this.m_objHttpRequest.status + "," + this.m_objHttpRequest.statusText + "," + strURL);
					}	
				}		
				return null;
		}
	}
};

HttpClient.prototype._makeHttpRequest = function ()
{
	if (null != this.m_objHttpFactory)
	{
		return this.m_objHttpFactory();
	}
	
	for (var i=0; i<HttpClient._HttpFactories.length; i++)
	{
		try
		{
			var objfactory = HttpClient._HttpFactories[i];
			var objRequest = objfactory();
			
			if (null != objRequest)
			{
				this.m_objHttpFactory = objfactory;
				return objRequest;
			}
		}
		catch (e)
		{
			continue;
		}
	}

	// 여기까지 왔다면 HttpRequest 생성에 실패한 것이다.
	HttpClient._HttpFactories = function ()
	{
		throw new Error("HttpRequest not supported");
	};
	HttpClient._HttpFactories();
};
	
HttpClient._HttpFactories =
[
	function () { return new XMLHttpRequest(); },
	function () { return new ActiveXObject("Msxml2.XMLHTTP"); },
	function () { return new ActiveXObject("Microsoft.XMLHTTP"); }
];

/**
 * 비동기 모드일때 답신을 처리한다.
 * @return
 */
HttpClient.handleASyncHttpResponse = function ()
{
	if (4 == this.readyState)
	{
		if (200 == this.status)
		{
			var strResult = this.responseText;
			
			if (null != strResult || !strResult.isEmpty())
			{
				// trim을  하지 않으면 Mozilla 계열의 Browser에서 Dom을 이상하게 만든다.
				strResult = strResult.trim();
				
				// result 처리
				var xnResultDoc = XmlLib.loadXMLFromString(strResult);
				if (null != xnResultDoc)
				{
					model.updateDataForASync(XmlLib.getRootElementNode(xnResultDoc));
				}
			}
		}
		else
		{
			throw new Error(this.status);
		}
	}
};