// Copyright 1998-2014 Epic Games, Inc. All Rights Reserved.


var UE_JavaScriptLibary =
{
	UE_SendAndRecievePayLoad: function (url, indata, insize, outdataptr, outsizeptr) {
		var _url = Pointer_stringify(url)

		var request = new XMLHttpRequest();
		if (insize && indata) {
		    var postData = Module.HEAP8.subarray(indata, indata + insize);
		    request.open('POST', _url, false);
		    request.overrideMimeType('text\/plain; charset=x-user-defined'); 
			request.send(postData);
		} else {
			request.open('GET', _url, false);
			request.send();
		}

		if (request.status != 200) {
			console.log("Fetching " + _url + " failed: " + request.responseText);

			Module.HEAP32[outsizeptr >> 2] = 0;
			Module.HEAP32[outdataptr >> 2] = 0;

			return;
		}

		// we got the XHR result as a string.  We need to write this to Module.HEAP8[outdataptr]
		var replyString = request.responseText;
		var replyLength = replyString.length;

		var outdata = Module._malloc(replyLength);
		if (!outdata) {
			console.log("Failed to allocate " + replyLength + " bytes in heap for reply");

			Module.HEAP32[outsizeptr >> 2] = 0;
			Module.HEAP32[outdataptr >> 2] = 0;

			return;
		}

		// tears and crying.  Copy from the result-string into the heap.
		var replyDest = Module.HEAP8.subarray(outdata, outdata + replyLength);
		for (var i = 0; i < replyLength; ++i) {
			replyDest[i] = replyString.charCodeAt(i) &  0xff;
		}

		Module.HEAP32[outsizeptr >> 2] = replyLength;
		Module.HEAP32[outdataptr >> 2] = outdata;
	},


	UE_SaveGame: function (name, userIndex, indata, insize){
			// user index is not used.
			var _name = Pointer_stringify(name);
			var gamedata = Module.HEAP8.subarray(indata, indata + insize);
			// local storage only takes strings, we need to convert string to base64 before storing.
			var b64encoded = base64EncArr(gamedata);
			$.jStorage.set(_name, b64encoded);
			return true;
	},


	UE_LoadGame: function (name, userIndex, outdataptr, outsizeptr){
		var _name = Pointer_stringify(name);
		// local storage only takes strings, we need to convert string to base64 before storing.
		var b64encoded = $.jStorage.get(_name);
		if (typeof b64encoded == null)
			return false;
		var decodedArray = base64DecToArr(b64encoded);
		// copy back the decoded array.
		var outdata = Module._malloc(decodedArray.length);
		// view the allocated data as a HEAP8.
		var dest = Module.HEAP8.subarray(outdata, outdata + decodedArray.length);
		// copy back.
		for (var i = 0; i < decodedArray.length; ++i) {
			dest[i] = decodedArray[i];
		}
		Module.HEAP32[outsizeptr >> 2] = decodedArray.length;
		Module.HEAP32[outdataptr >> 2] = outdata;
		return true;
	},

	UE_DoesSaveGameExist: function (name, userIndex){
		var _name = Pointer_stringify(name);
		var b64encoded = $.jStorage.get(_name);
		if (b64encoded == null)
			return false;
		return true;
	},

    UE_MessageBox: function (type, message, caption ) {
        // type maps to EAppMsgType::Type
        if ( type == 0 ){
            var text = Pointer_stringify(message);
            if (!confirm(text)) 
                return 0; 
        } else {
            var text = Pointer_stringify(message);
            alert(text);
        }
        return 1; 
    },

    UE_GetCurrentCultureName: function (address, outsize) {
        var culture_name = navigator.language || navigator.browserLanguage;
        if (culture_name.lenght >= outsize) {
            return 0;
        }
        Module.writeAsciiToMemory(culture_name, address);
        return 1;
    },

    UE_MakeHTTPDataRequest: function (ctx, url, verb, payload, freeBuffer, onload, onerror, onprogress) {
	    var _url = Pointer_stringify(url);
	    var _verb = Pointer_stringify(verb);
	    var _payload = Pointer_stringify(payload);

	    var xhr = new XMLHttpRequest();
	    xhr.open(_verb, _url, true);
	    xhr.responseType = 'arraybuffer';

	    // Onload event handler
	    xhr.addEventListener('load', function (e) {
   	        if (xhr.status === 200 || _url.substr(0, 4).toLowerCase() !== "http") {
       	            var byteArray = new Uint8Array(xhr.response);
       	            var buffer = _malloc(byteArray.length);
       	            HEAPU8.set(byteArray, buffer);
       	            if (onload) 
       	                    Runtime.dynCall('viii', onload, [ctx, buffer, byteArray.length]);
       	            if (freeBuffer) 
       	                    _free(buffer);
   	        } 
   	        else{
   	            if (onerror) Runtime.dynCall('viii', onerror, [ctx, xhr.status, xhr.statusText]);
   	        }
	    });

	    // Onerror event handler
	    xhr.addEventListener('error', function (e) {
	        if (onerror) Runtime.dynCall('viii', onerror, [ctx, xhr.status, xhr.statusText]);
	    });

	    // Onprogress event handler
	    xhr.addEventListener('progress', function (e) {
	        if (onprogress) Runtime.dynCall('viii', onprogress, [ctx, e.loaded, e.lengthComputable || e.lengthComputable === undefined ? e.total : 0]);
	    });

	    // Bypass possible browser redirection limit
	    try {
	        if (xhr.channel instanceof Ci.nsIHttpChannel)
	            xhr.channel.redirectionLimit = 0;
	    } catch (ex) { }

	    if (_verb === "POST") {
	        //Send the proper header information along with the request
	        xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	        xhr.setRequestHeader("Content-length", _payload.length);
	        xhr.setRequestHeader("Connection", "close");
	        xhr.send(_payload);
	    } else {
	        xhr.send(null);
	    }
    }
};

mergeInto(LibraryManager.library, UE_JavaScriptLibary);