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var VensimLoadingFilesCount = 0;	//Count of files currently being loaded to the WASM file system


function SetConstant(strParameter, fValue)
{
	var ptr  = allocate(intArrayFromString(strParameter), ALLOC_NORMAL);
	return _SetConstant(-1, ptr, fValue);
}

function GetConstant(strParameter, fValue)
{
	var ptr  = allocate(intArrayFromString(strParameter), ALLOC_NORMAL);
	return _GetConstant(ptr);
}


function LoadFileToWASMFileSystem(strFileToLoad)
{
	VensimLoadingFilesCount++;
	
	var oReq = new XMLHttpRequest();
	oReq.open("GET", strFileToLoad, true);
	oReq.responseType = "arraybuffer";

	oReq.onload = function (oEvent)
	{
		var arrayBuffer = oReq.response;
		if (arrayBuffer)
		{
			var byteArray = new Uint8Array(arrayBuffer);
			var bFileCreated = FS.writeFile(strFileToLoad, byteArray);
			
			var ptr  = allocate(intArrayFromString(strFileToLoad), ALLOC_NORMAL);
			_LoadRun(ptr);
		}
		VensimLoadingFilesCount--;
	};

	oReq.send();
}




function LoadFileToWASMFileSystem(strFileToLoad)
{
	VensimLoadingFilesCount++;
	
	var oReq = new XMLHttpRequest();
	oReq.open("GET", strFileToLoad, true);
	oReq.responseType = "arraybuffer";

	oReq.onload = function (oEvent)
	{
		var arrayBuffer = oReq.response;
		if (arrayBuffer)
		{
			var byteArray = new Uint8Array(arrayBuffer);
			var bFileCreated = FS.writeFile(strFileToLoad, byteArray);
			
			var ptr  = allocate(intArrayFromString(strFileToLoad), ALLOC_NORMAL);
			_LoadRun(ptr);
		}
		VensimLoadingFilesCount--;
	};

	oReq.send();
}

function CloseRun(strRun)
{
	var ptr  = allocate(intArrayFromString(strRun), ALLOC_NORMAL);
	return _CloseRun(ptr);
}

function GetVariableIndex(strParameter)
{
	var ptr  = allocate(intArrayFromString(strParameter), ALLOC_NORMAL);
	return _GetVariableIndex(ptr);
}

/*
function LoadFileFromServer(filePath)
{
	var result = null;
	var xmlhttp = new XMLHttpRequest();
	
	xmlhttp.open("GET", filePath, false);
	xmlhttp.send();

	if (xmlhttp.status==200)
	{
		var responseType = xmlhttp.responseType;
		result = xmlhttp.responseText;
	}
	
	return result;
}
*/

function ExportCSV()
{
	_DumpResultsToDisk();
	DownloadFile("export.csv");
}

function DownloadFile(strFileName)
{
    var stream = FS.open(strFileName, 'r');
	
	if ( stream)
	{
		var fileStats = FS.stat(strFileName);
		var nSize = fileStats.size;
		var buf = new Uint8Array(nSize);
		FS.read(stream, buf, 0, nSize, 0);
		FS.close(stream);

		var bb = new Blob([buf], { type: 'text/plain' });
		var a = document.createElement('a');
		
		a.download = strFileName;
		a.href = window.URL.createObjectURL(bb);
		a.click();
		return;
	}
	
	alert('Error : Export not found.')
}

function AddCINFileFromServer(strFileToLoad)
{
	VensimLoadingFilesCount++;

	var oReq = new XMLHttpRequest();
	oReq.open("GET", strFileToLoad, true);
	oReq.responseType = "arraybuffer";
	
	oReq.onload = function (oEvent)
	{
		var arrayBuffer = oReq.response; // Note: not oReq.responseText
		VensimLoadingFilesCount--;
		if (arrayBuffer)
		{
			var byteArray = new Uint8Array(arrayBuffer);
			var bFileCreated = FS.writeFile(strFileToLoad, byteArray);

			//Run the model and update the graphs.
			var ptr  = allocate(intArrayFromString(strFileToLoad), ALLOC_NORMAL);
			InitializeModel();
			_AddCINFile(ptr);
			RunSim();
			UpdateCharts(1);
		}
	};
	oReq.send(null);
}

function SetConstantUsingIndex(nIndex, fValue)
{
	return _SetConstant(nIndex, "", fValue);
}

function GetNumVariables()
{
	return _GetNumVariables();
}

function GetVariableName(nIndex)
{
	var tempptr = _GetVariableName(nIndex);
	var strVarName = UTF8ToString(tempptr);
	return strVarName;
}

function GetVariableType(nIndex)
{
	return _GetVariableType(nIndex);
}

function InitializeModel()
{
	return _InitializeModel();
}

function GetNumberOfSubscriptElements(strParameter)
{
	var ptr  = allocate(intArrayFromString(strVarName), ALLOC_NORMAL);
	return _GetNumberOfSubscriptElements(ptr);
}

function RunSim()
{
	return _RunSim();
}

function GetSeriesNumVals(strVarName)
{
	var ptr  = allocate(intArrayFromString(strVarName), ALLOC_NORMAL);
	return _GetTimeSeriesNumVals(ptr);
}

function GetSeries(strVarName)
{
	var nNumVals = GetSeriesNumVals(strVarName);
	var ptr  = allocate(intArrayFromString(strVarName), ALLOC_NORMAL);
	var nNumValsReturned = nNumVals;
	var fResultsArray = ccallArrays("GetSeries", "array", ["intArray"], [ptr], {heapIn: "HEAPF64", heapOut: "HEAPF64", returnArraySize: nNumValsReturned});
	return fResultsArray;
}

function GetValueAtTime(strVarName, fTime)
{
	var ptr  = allocate(intArrayFromString(strVarName), ALLOC_NORMAL);
	return _GetValueAtTime(ptr, fTime);
}