//+------------------------------------------------------------------+
//|                                                     LogUtils.mqh |
//|                                               Paul Hampton-Smith |
//|                                               paul1000@pobox.com |
//+------------------------------------------------------------------+

int nDaysSince1970 = 0;
int LogHandle = -1;
bool bEnableLogging = false; // set this true in EA init()

void OpenLog(string strName)
{
	if (!bEnableLogging) return;

	if (TimeCurrent()/(60*60*24) > nDaysSince1970 || LogHandle <= 0 )
	{
		// startup or new day
		if (LogHandle > 0) FileClose(LogHandle);
		string strMonthPad = "";
 	 	string strDayPad = "";
  		if (Month()<10) strMonthPad = "0";
  		if (Day()<10) strDayPad = "0";
  		string strFilename = StringConcatenate(strName,"_",Year(),strMonthPad,Month(),strDayPad,Day(),"_log.txt");
		LogHandle = FileOpen(strFilename,FILE_CSV|FILE_READ|FILE_WRITE);
		nDaysSince1970 = TimeCurrent()/(60*60*24);
	}
	FileFlush(LogHandle);
	FileSeek(LogHandle,0,SEEK_END);
}

void Log(string msg)
{
	if (!bEnableLogging) return;
	if (LogHandle <= 0) return;
	msg = TimeToStr(TimeCurrent(),TIME_DATE|TIME_MINUTES|TIME_SECONDS) + " " + msg;
	FileWrite(LogHandle,msg);
}

void LogFlush()
{
	FileFlush(LogHandle);
}