/**
 * Wikipedia API Handler
 *
 * A simple object for interacting with Wikipedia's API.
 */
function WPAPIHandler(){
}

WPAPIHandler.requests = new Array();
WPAPIHandler.timeoutSeconds = REQUESTTIMEOUT;

 
/**
 * Perform Request
 *
 * Uses a callback function to perform a request to the WP api.
 *
 * @param	params	An object with members reflecting the parameters to be used when calling the API
 * @param	func	The function to be called with the results of the request to the API
 * @param	args	A list of arguements to pass to the function along with the result of the request
 */
WPAPIHandler.performGET = function(params, successFun, args, errorFun){
	paramString = "?foo=lol"
	for(key in params){
		paramString += "&" + key + "=" + escape(params[key])
	}
	
	url = "http://en.wikipedia.org/w/api.php" + paramString
	
	request = this.createRequest();
	if(!request){
		errorFun("Your browser does not support the ability to make requests to the Wikipedia database.");
		return;
	}
	request.open("GET", url, true);
	request.setRequestHeader("Pragma", "cache=yes");
	request.setRequestHeader("Cache-Control", "no-transform");
	request.successFun = successFun
	request.errorFun = errorFun
	request.args = args
	request.onreadystatechange = function() {
		if (this.readyState != 4)
			return;
		if (this.status != 200){
			this.errorFun("The Wikipedia server responded with an error: " + this.status + " " + this.statusText + ": " + this.responseText);
			return;
		}
		clearTimeout(this.timeoutRef);
		this.successFun(this.responseText, this.args);
		return;
	}
	request.send(null)
	currentRequestId = this.requests.length
	this.requests[currentRequestId] = request
	request.timeoutRef = setTimeout("WPAPIHandler.timeout(" + currentRequestId + ")", this.timeoutSeconds)
}


WPAPIHandler.timeout = function(requestId){
	request = this.requests[requestId];
	request.errorFun("Request to Wikipedia database timed out.");
	try{
		request.abort();
	}catch(e){
		//then don't abort I guess 
	}
}


 
 
/**
 * Perform Request
 *
 * Uses a callback function to perform a request to the WP api.
 *
 * @param	params	An object with members reflecting the parameters to be used when calling the API
 * @param	func	The function to be called with the results of the request to the API
 * @param	args	A list of arguements to pass to the function along with the result of the request
 */
WPAPIHandler.performPOST = function(params, successFun, args, errorFun){
	paramString = "foo=lol"
	for(key in params){
		paramString += "&" + key + "=" + this.escape(params[key])
	}
	url = "http://en.wikipedia.org/w/api.php"
	
	request = this.createRequest();
	if(!request){
		errorFun("Your browser does not support the ability to make requests to the Wikipedia database.");
		return;
	}
	request.open("POST", url, true);
	request.setRequestHeader("Pragma", "cache=yes");
	request.setRequestHeader("Cache-Control", "no-transform");
	request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	request.setRequestHeader("Content-length", paramString.length);
	request.setRequestHeader("Connection", "close");
	request.successFun = successFun
	request.errorFun = errorFun
	request.args = args
	request.onreadystatechange = function() {
		if (this.readyState != 4)
			return;
		if (this.status != 200){
			this.errorFun("The Wikipedia server responded with an error: " + this.status + " " + this.statusText + ": " + this.responseText);
			return;
		}
		clearTimeout(this.timeoutRef);
		this.successFun(this.responseText, this.args);
		return;
	}
	request.send(paramString)
	currentRequestId = this.requests.length
	this.requests[currentRequestId] = request
	request.timeoutRef = setTimeout("WPAPIHandler.timeout(" + currentRequestId + ")", this.timeoutSeconds)
}
 
/**
 * Create Request
 *
 * Generates an appropriate XMLHttpRequest object for the browser being
 * used or raises an exception.
 */
WPAPIHandler.createRequest = function() {
	var requestObject;
	try {
		requestObject = new XMLHttpRequest();
	} catch (e) {
		try {
			requestObject=new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				requestObject=new ActiveXObject("Microsoft.XMLHTTP");
			} catch (oc) {
				requestObject=null;
			}
		}
	}
 
	return requestObject;
}
 
WPAPIHandler.escape = function(string){
	resultString = escape(string);
	return resultString.replace(/\+/, "%2B")
}