// logfile.h :
//

#if !defined(AGD_LOGFILE_H__4DFE59C7_5C38_431E_AD27_9E88C67490A8__INCLUDED_)
#define AGD_LOGFILE_H__4DFE59C7_5C38_431E_AD27_9E88C67490A8__INCLUDED_

#include <stdio.h>
#include <stdarg.h>

#ifdef __cplusplus

#include <string>

/////////////////////////////////////////////////////////////////////////////
// logfile.h - Declarations:

#define _MAX_LOGFILE_SIZE			(0x1ul << 20)	// 1 MiB
#define _MAX_BACKUP_FILES			1

/////////////////////////////////////////////////////////////////////////////

#ifdef _DEBUG
#define _DEF_VERBOSITY				VB_Dbg
#else	//	_DEBUG
#define _DEF_VERBOSITY				VB_Inf
#endif	//	_DEBUG

class CLogfile // thread safe
{
public:
	enum Verbosity
	{
		VB_Off,	// 0, do not log anything
		VB_Err,	// 1, log errors only
		VB_War,	// 2, log errors and warnings
		VB_Inf,	// 3, log errors, warnings and infos
		VB_Dbg	// 4, log errors, warnings, infos and debug info
	};

	/////////////////////////////////////////////////////////////////////////

public:
	CLogfile(void);
	CLogfile(FILE *fd, bool bClose = false, int verb = _DEF_VERBOSITY);
	CLogfile(const char *pszFilename, bool bAppend = true, int verb = _DEF_VERBOSITY, size_t nMaxFileSize = _MAX_LOGFILE_SIZE, unsigned int nMaxBackupFiles = _MAX_BACKUP_FILES);
	virtual ~CLogfile(void);

	bool Open(const char *pszFilename, bool bAppend = true, int verb = _DEF_VERBOSITY, size_t nMaxFileSize = _MAX_LOGFILE_SIZE, unsigned int nMaxBackupFiles = _MAX_BACKUP_FILES);
	void Close(void);
	void Flush(void);

	bool Attach(FILE *fd, bool bClose = false, int verb = _DEF_VERBOSITY);
	void Detach(void);

	void Lock(void) {
		CsLock();}
	void Unlock(void) {
		CsUnlock();}

	void SetVerbosity(int verb);
	int GetVerbosity(void) const {
		return m_vb;}

	void Debug(const char *pszFormat, ...);		// output = date time - DEBUG:   message
	void Info(const char *pszFormat, ...);		// output = date time - INFO:    message
	void Warning(const char *pszFormat, ...);	// output = date time - WARNING: message
	void Error(const char *pszFormat, ...);		// output = date time - ERROR:   message
	void Log(const char *pszFormat, ...);		// plain message

	static void StdOut(const char *pszFormat, ...); // not thread safe
	static void StdErr(const char *pszFormat, ...); // not thread safe
	
	size_t GetFileSize(void);

	/////////////////////////////////////////////////////////////////////////

protected:
	virtual const char* CreateFormatString(Verbosity verb, const char *pszFormat, std::string &ret) const;

	/////////////////////////////////////////////////////////////////////////

private:
	void Log(FILE *fd, const char *pszFormat, va_list args);
	void CsLock(void);
	void CsUnlock(void);
	bool ProcessFileSizeLimit(FILE *fd);

	/////////////////////////////////////////////////////////////////////////

private:
	FILE *m_pf;
	std::string m_strFilePath;
	bool m_bAttached;
	bool m_bClose;
	Verbosity m_vb;
	pthread_mutex_t m_lsync;
	size_t m_nFileSize;
	size_t m_nMaxFileSize;
	unsigned int m_nMaxBackupFiles;
};

/////////////////////////////////////////////////////////////////////////////

#endif	//	__cplusplus
#endif	//	!defined(AGD_LOGFILE_H__4DFE59C7_5C38_431E_AD27_9E88C67490A8__INCLUDED_)