/**
 * @file internet.js
 * @version 20170829 fk
 * @type JS
 *
 * Komponente zum Ausführen von HTTP-Requests
 */

/**
 * @class KInternet
 */
var KInternet=function(){};

/**
 * @fn HTTPRequest
 * @memberof KInternet
 * @param {string} url
 * @param {function} func
 * @param {string|FormData|array of String|Blob} body
 * @param {boolean} binary 
 */
KInternet.HTTPRequest=function(url,func,body,binary){
	var xhr=new XMLHttpRequest();
	if(body){
		xhr.open("POST",url,true);
		if(binary) xhr.responseType="arraybuffer";
		if(typeof body==='string' || body instanceof String){
			xhr.setRequestHeader("Content-type","application/x-www-form-urlencoded");
		}else if(typeof body==='object' && !(body instanceof FormData)){
			var fd=new FormData();
			for(var key in body) fd.append(key,typeof body[key]==='string' || body[key] instanceof String || body[key] instanceof Blob?body[key]:JSON.stringify(body[key]));
			body=fd;
//for(var pair of fd.entries()) console.log(pair[0]+ ': '+ pair[1]);
		}
	}else{
		xhr.open("GET",url,true);
		body=null;
	}
	xhr.onload=function(){
		if(xhr.readyState===4){
			if(xhr.status===200){
				if(binary){
					func(this.response);
				}else{
					var d=this.responseXML;
					if(!d && this.getResponseHeader("content-type")==="application/json"){
						try{
							d=JSON.parse(this.responseText);
						}catch(e){alert("Error parsing JSON\n"+this.responseText);}
					}
					func(this.responseText,d);
				}
			}else
				console.error(this.statusText);
		}
	};
	xhr.onerror=function(e){
		console.error(this.statusText);
	};
	xhr.send(body);
};

/**
 * @fn EncodeUTF8(s)
 * @memberof KInternet 
 * @param {string} s
 * @returns {String}
 */
KInternet.EncodeUTF8=function(s){			// DEPRECATED !!!
	console.log("KInternet.EncodeUTF8() is deprecated - use encodeURIComponent() instead!");
	var u="";
	for(var n=0;n<s.length;n++){
		var c=s.charCodeAt(n);
		if(c<128) u+=String.fromCharCode(c);
		else if((c>127) && (c<2048)){
			u+=String.fromCharCode((c>>6) | 192);
			u+=String.fromCharCode((c & 63) | 128);
		}else{
			u+=String.fromCharCode((c>>12) | 224);
			u+=String.fromCharCode(((c>>6) & 63) | 128);
			u+=String.fromCharCode((c & 63) | 128);
		}
	}
	return u;
};

/**
 * @fn EncodeURL(s)
 * @memberof KInternet 
 * @param {string} s
 * @returns {String}
 */
KInternet.EncodeURL=function(s){			// DEPRECATED !!!
	console.log("KInternet.EncodeURL() is deprecated - use encodeURIComponent() instead!");
	var t="";
	var x=0;
	var regex=/(^[a-zA-Z0-9_.]*)/;
	while(x<s.length){
		var match = regex.exec(s.substr(x));
		if(match!=null && match.length>1 && match[1]!=""){
			t+=match[1];
			x+=match[1].length;
		}else{
			if(s[x]==" ")
				t+="+";
			else{
				var charCode=s.charCodeAt(x);
				var hexVal=charCode.toString(16);
				t+="%"+(hexVal.length<2 ? "0" : "")+hexVal.toUpperCase();
			}
			x++;
		}
	}
	return t;
};