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#ifndef __VA_LOG_H__
#define __VA_LOG_H__

#include <VACoreDefinitions.h>

#include <VACore.h>
#include <VAException.h>

#include <ITAClock.h>
#include <ITAAtomicPrimitives.h>

#include <tbb/concurrent_queue.h>

#include <VistaInterProcComm/Concurrency/VistaMutex.h>
#include <VistaInterProcComm/Concurrency/VistaThreadEvent.h>
#include <VistaInterProcComm/Concurrency/VistaThreadLoop.h>

#include <iostream>
#include <list>
#include <stdarg.h>

extern VACORE_API std::ostream* VA_STDOUT;
extern VACORE_API std::ostream* VA_STDERR;

void VACORE_API VALog_setOutputStream(std::ostream* os);
void VACORE_API VALog_setErrorStream(std::ostream* os);
int VACORE_API VALog_GetLogLevel();
void VACORE_API VALog_SetLogLevel( int );

VistaMutex& VALog_getOutputStreamMutex();

#define VA_PRINT( expr )			{ if (VA_STDOUT && (VALog_GetLogLevel() >= IVACore::VA_LOG_LEVEL_QUIET ) )		{ VistaMutexLock oLock(VALog_getOutputStreamMutex() ); (*VA_STDOUT) << "[VAPrint  ] " << expr << std::endl; } }
#define VA_ERROR( module, expr )	{ if (VA_STDOUT && (VALog_GetLogLevel() >= IVACore::VA_LOG_LEVEL_QUIET ) )		{ VistaMutexLock oLock(VALog_getOutputStreamMutex() ); (*VA_STDERR) << "[VAError  ] " << module << ": " << expr << std::endl; } }
#define VA_WARN( module, expr )		{ if (VA_STDOUT && (VALog_GetLogLevel() >= IVACore::VA_LOG_LEVEL_ERROR ) )		{ VistaMutexLock oLock(VALog_getOutputStreamMutex() ); (*VA_STDOUT) << "[VAWarning] " << module << ": " << expr << std::endl; } }
#define VA_INFO( module, expr )		{ if (VA_STDOUT && (VALog_GetLogLevel() >= IVACore::VA_LOG_LEVEL_INFO ) )		{ VistaMutexLock oLock(VALog_getOutputStreamMutex() ); (*VA_STDOUT) << "[VAInfo   ] " << module << ": " << expr << std::endl; } }
#define VA_VERBOSE( module,expr )	{ if (VA_STDOUT && (VALog_GetLogLevel() >= IVACore::VA_LOG_LEVEL_VERBOSE ) )	{ VistaMutexLock oLock(VALog_getOutputStreamMutex() ); (*VA_STDOUT) << "[VAVerbose] " << module << ": " << expr << std::endl; } }
#define VA_TRACE( module, expr )	{ if (VA_STDOUT && (VALog_GetLogLevel() >= IVACore::VA_LOG_LEVEL_TRACE ) )		{ VistaMutexLock oLock(VALog_getOutputStreamMutex() ); (*VA_STDOUT) << "[VATrace  ] " << module << ": " << expr << std::endl; } }

class CVALogItem
{
public:
	double dTimestamp;
	std::string sLogger;
	std::string sMsg;

	CVALogItem() : dTimestamp(0) {};

	CVALogItem(double dTheTimestamp, const std::string sTheLogger, const std::string sTheMsg)
	: dTimestamp(dTheTimestamp), sLogger(sTheLogger), sMsg(sTheMsg) {};
	
	//! Grer-Operator zur Verwendung der sort() Funktion
	bool CVALogItem::operator> (CVALogItem const& rhs);

	//! Kleiner-Operation
	bool CVALogItem::operator< (CVALogItem const& rhs);

};

class CVARealtimeLogStream;

//! Realtime Logger entkoppelt die Ausgabe von Logger-Streams auf einem niederpriorisierten Thread
class CVARealtimeLogger : public VistaThreadLoop {
public:
	CVARealtimeLogger();
	~CVARealtimeLogger();

	static CVARealtimeLogger* GetInstance();

	//! Streams registrieren
	void Register(CVARealtimeLogStream* pStream);

	//! Streams deregistrieren
	void Unregister(CVARealtimeLogStream* pStream);

	//! Thread anschubsen (nach Aktion)
	void Trigger();

	//! Ausgabe
	bool LoopBody();

	void PreLoop() {};
	void PostLoop() {};

private:
	VistaThreadEvent m_evTrigger;
	ITAAtomicInt m_iTriggerCnt;
	ITAAtomicBool m_bStop;
	std::list<CVARealtimeLogStream*> m_lpStreams;
	VistaMutex m_mxRegistration;
};

//! Implementierung des Echtzeit-Logger-Streams
/**
  * Nutzt den RealtimeLogger, um Stream-Informationen mittels
  * niederpriorisiertem Thread auf die Konsole oder Visual Studio Ausgabe
  * auszugeben.
  */
class CVARealtimeLogStream {
public:
	CVARealtimeLogStream(ITAClock* pClock=ITAClock::getDefaultClock())
	: m_pClock(pClock) {
		// Bei Ausgabe-Thread registrieren (Singleton)
		CVARealtimeLogger::GetInstance()->Register(this);
	}

	virtual ~CVARealtimeLogStream() {
		// Bei Thread deregistieren
		CVARealtimeLogger::GetInstance()->Unregister(this);
	}

	std::string GetName() const {
		return m_sName;
	}

	void SetName(const std::string& sName) {
		m_sName = sName;
	}

	// Ausgabe
	void Printf(const char * format, ...) {
		char buf[16384];
		va_list args;
		va_start(args, format);
		vsprintf_s(buf, format, args);
		va_end(args);

		m_qLog.push( CVALogItem(m_pClock->getTime(), m_sName, buf) );
		// TODO: Thread zur Ausgabe anwerfen ggf.
	}

private:
	ITAClock* m_pClock;
	std::string m_sName;
	tbb::strict_ppl::concurrent_queue<CVALogItem> m_qLog;

	friend class CVARealtimeLogger;
};
#endif // __VA_LOG_H__