// datalogger.h :
//

#if !defined(AGD_DATALOGGER_H__21BAEB7B_E478_4ED1_B9F6_FDBCE620C55B__INCLUDED_)
#define AGD_DATALOGGER_H__21BAEB7B_E478_4ED1_B9F6_FDBCE620C55B__INCLUDED_

#include <limits.h>
#include <vector>
#include <pthread.h>
#ifndef _LIBBUILD
#include <gfa/svc/common/mysqlwrap.h>
#include <gfa/svc/common/logfile.h>
#else	//	_LIBBUILD
#include "common/mysqlwrap.h"
#include "common/logfile.h"
#endif	//	_LIBBUILD

/////////////////////////////////////////////////////////////////////////////
// datalogger.h - Declarations:

#define _DL_DATABASE_ENGINE_INNODB		1
#define _DL_DATABASE_ENGINE_MYISAM		2

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

#define _DL_USE_NEW_TABLES_LAYOUT		1
#define _DL_DATABSE_ENGINE				_DL_DATABASE_ENGINE_INNODB

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

#if _DL_DATABSE_ENGINE == _DL_DATABASE_ENGINE_INNODB
#define _DL_DATABSE_ENGINE_NAME			"InnoDB"
#define _DL_MAX_VARPATH_LENGTH			767
#elif _DL_DATABSE_ENGINE == _DL_DATABASE_ENGINE_MYISAM
#define _DL_DATABSE_ENGINE_NAME			"MyISAM"
#define _DL_MAX_VARPATH_LENGTH			1000
#else	//	_DL_DATABSE_ENGINE
#error Invalid database engine!
#endif	//	_DL_DATABSE_ENGINE

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

#define _DL_NANOSECS_PER_SEC			1000000000
#define _DL_MAX_DB_NAME_LENGTH			64
#define _DL_MAX_DB_USER_LENGTH			64
#define _DL_MAX_DB_PASS_LENGTH			64
#define _DL_MAX_TABLE_NAME_LENGTH		64

#define _SECONDS_PER_DAY				86400
#define _MIDNIGHT_TIMESTAMP_UTC(t)		((t) / _SECONDS_PER_DAY * _SECONDS_PER_DAY)

typedef enum _LogTypes
{
	LT_NoLog,
	LT_IntervalConditional,
	LT_IntervalUnconditional,
	LT_ValueChangeConditional,
	LT_ValueChangeUnconditional,
	LT_IntervalConditionalRem,
	LT_IntervalUnconditionalRem,
	LT_ValueChangeConditionalRem,
	LT_ValueChangeUnconditionalRem
}LogTypes, *LPLogTypes;

#define _IS_VALID_LOGTYPE(lt)			(((lt) > LT_NoLog) && ((lt) <= LT_ValueChangeUnconditionalRem))
#define _IS_VALUE_CHANGE_LOGTYPE(lt)	(((lt) == LT_ValueChangeConditional) || ((lt) == LT_ValueChangeUnconditional) || ((lt) == LT_ValueChangeConditionalRem) || ((lt) == LT_ValueChangeUnconditionalRem))
#define _IS_INTERVAL_LOGTYPE(lt)		(((lt) == LT_IntervalConditional) || ((lt) == LT_IntervalUnconditional) || ((lt) == LT_IntervalConditionalRem) || ((lt) == LT_IntervalUnconditionalRem))
#define _IS_CONDITIONAL_LOGTYPE(lt)		(((lt) == LT_ValueChangeConditional) || ((lt) == LT_IntervalConditional) || ((lt) == LT_ValueChangeConditionalRem) || ((lt) == LT_IntervalConditionalRem))
#define _IS_UNCONDITIONAL_LOGTYPE(lt)	(((lt) == LT_IntervalUnconditional) || ((lt) == LT_ValueChangeUnconditional) || ((lt) == LT_IntervalUnconditionalRem) || ((lt) == LT_ValueChangeUnconditionalRem))
#define _IS_DB_PERSISTENT_LOGTYPE(lt)	(((lt) >= LT_IntervalConditionalRem) && ((lt) <= LT_ValueChangeUnconditionalRem))

typedef struct _DLPARAMS
{
	char szDBName[_DL_MAX_DB_NAME_LENGTH];
	char szDBUser[_DL_MAX_DB_USER_LENGTH];
	char szDBPass[_DL_MAX_DB_PASS_LENGTH];
	char szTagsTable[_DL_MAX_TABLE_NAME_LENGTH];
	char szLogsTable[_DL_MAX_TABLE_NAME_LENGTH];
	char szLogsTableBD[_DL_MAX_TABLE_NAME_LENGTH]; // bad date logs table
	const char *pszBaseDir;
	unsigned int nIntvSample;		// sample interval
	unsigned int nIntvLog;			// log interval
	unsigned int nIntvFlush;		// flush interval
	unsigned int nMaxAge;			// Max age of Logs entries in days
	unsigned long long nMaxSize;	// max. Logs table size in Byte
	bool bMinMax;					// log min max values as well?
}DLPARAMS, *LPDLPARAMS;
typedef const DLPARAMS *LPCDLPARAMS;


typedef struct _DL_LOG_ENTRY
{
	unsigned long nTagID;
	time_t nTimestamp;
	double fValue;
	double fMin;
	double fMax;
	int nIndex;
	LogTypes lt;
	bool bNull;
}DL_LOG_ENTRY, *LPDL_LOG_ENTRY;
typedef const DL_LOG_ENTRY *LPCDL_LOG_ENTRY;

typedef struct _MYSQL_GLOBAL_VARS
{
	bool bLogsTblIsInnoDB;
	bool bInnoDbFilePerTable;
	bool bInnoDbIsBarracuda;
	bool bInnoDbIsStrictMode;
	char szInnoDbFileFormat[64];
	char szDataDir[PATH_MAX];
}MYSQL_GLOBAL_VARS, *LPMYSQL_GLOBAL_VARS;
typedef const MYSQL_GLOBAL_VARS *LPCMYSQL_GLOBAL_VARS;

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

class CDataLogger
{
public:
	CDataLogger(LPCDLPARAMS pdlp, CLogfile &rlf);
	virtual ~CDataLogger(void);
	
	bool InitDatabase(bool bEnforceCreate = false);
	void Release(void);
	unsigned long GetTagID(const char *pszVarPath, int nDataType, int nLogType);
	bool Log(unsigned long nTagID, double fValue, double fMin, double fMax, time_t nTimestamp, int nIndex, LogTypes lt, bool bNull = false, bool bNoBadDateCheck = false);
	bool Flush(time_t nTimestamp);
	bool TableFileExists(const char *pszTableName);
	int64_t TableFileSize(const char *pszTableName);
	void SizeGuardTrigger(time_t ts);

	time_t LastLogTimestamp(void){
		return m_nLastLogTimestamp;}

	bool SizeGuardDayWorkDone(time_t ts){
		return m_nSGLastPassUTC == (unsigned long long)_MIDNIGHT_TIMESTAMP_UTC(ts);}

	bool Lock(void){
		return !::pthread_mutex_lock(&m_mtx);}

	bool TryLock(void){
		return !::pthread_mutex_trylock(&m_mtx);}

	bool Unlock(void){
		return !::pthread_mutex_unlock(&m_mtx);}

private:
	bool CreateDatabase(CMySqlDB &rdb, bool bEnforceCreate = false);
	bool CreateTagsTable(CMySqlDB &rdb);
	bool AlterTagsTable(CMySqlDB &rdb);
	bool CreateLogsTable(CMySqlDB &rdb);
	bool CreateLogsBDTable(CMySqlDB &rdb);

	bool CheckTable(CMySqlDB &rdb, const char *pszTableName, bool &bExists, bool &bUseResortTable, bool &bIsInnoDB);
//	bool QueryTableSizes(CMySqlDB &rdb, const char *pszTableName);
	bool DoSizeGuard(void);
	bool ReadGlobalOptions(CMySqlDB &rdb);
	bool QueryServerVariable(CMySqlDB &rdb, const char *pszVarname, CMySqlVar &val);
//	bool QueryStatusVariable(CMySqlDB &rdb, const char *pszVarname, CMySqlVar &val);
	static void* SizeGuardWorker(void* pParam);
	unsigned long long SizeGuardLastPassRead(void);
	void SizeGuardLastPassWrite(unsigned long long ts);
	static size_t Timestamp2String(time_t t, char *pszBuffer, size_t nCbBuffer);
	static const char* Ns2String(unsigned long long nNs, char *pszBuffer, size_t nCbBuffer);
	static const char* Ms2String(double fMs, char *pszBuffer, size_t nCbBuffer);
	time_t GetLastLogTimestamp(CMySqlDB &rdb);
	
private:
	CLogfile &m_lf;
	DLPARAMS m_dlp;
	MYSQL_GLOBAL_VARS m_gv;
    char m_szAppDir[PATH_MAX];
	std::vector<DL_LOG_ENTRY> m_logs;
	std::vector<DL_LOG_ENTRY> m_logsBD;
    pthread_t m_tidSGThread;
    bool m_bSGHasSizeLimitPrerequisites;
    bool m_bSGInProgress;
    bool m_bSGConfigured;
    unsigned long long m_nSGCurPassUTC;
    unsigned long long m_nSGLastPassUTC;
   	pthread_mutex_t m_mtx;
	pthread_mutexattr_t m_mutexAttr;
   	pthread_mutex_t m_condmtx1;
	pthread_cond_t m_cond1;
	time_t m_nLastLogTimestamp;
	bool m_bBadDateLogsDetected;
};

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

class CDataLoggerClock
{
public:
	CDataLoggerClock(unsigned long long nSampleTimeNs);
	virtual ~CDataLoggerClock(void);

	static unsigned long long GetNanoTick(struct timespec *pts = NULL);

	inline static unsigned long long GetMicroTick(struct timespec *pts = NULL){
		return GetNanoTick(pts) / 1000;}

	inline static unsigned long long GetMilliTick(struct timespec *pts = NULL){
		return GetNanoTick(pts) / 1000000;}

	inline static unsigned long long Timespec2NanoSec(const struct timespec *pts){
		return (unsigned long long)pts->tv_sec * _DL_NANOSECS_PER_SEC + (unsigned long long)pts-> tv_nsec;}

	inline static void NanoSec2Timespec(unsigned long long n, struct timespec *pts){
		if(pts){
			pts->tv_sec	 = n / _DL_NANOSECS_PER_SEC;
			pts->tv_nsec = n % _DL_NANOSECS_PER_SEC;
		}}

	inline static long long CompareTimespec(const struct timespec *pts1, const struct timespec *pts2){
		unsigned long long n1 = Timespec2NanoSec(pts1);
		unsigned long long n2 = Timespec2NanoSec(pts2);
		return (long long)(n1 - n2);}

	bool Sleep(bool &bTimerUnderrun, bool fAvoidCatchUpRaceOnTimerUnderrun);

private:
	inline unsigned long long IncTime(struct timespec *pts, long long ns) const {
		unsigned long long n = Timespec2NanoSec(pts);
		n += ns;
		NanoSec2Timespec(n, pts);
		return n;}

private:
	struct timespec m_tsDueTime;
	bool m_fSleepStarted;
	const long long m_nSampleTimeNs;
};

/////////////////////////////////////////////////////////////////////////////
#endif	//	!defined(AGD_DATALOGGER_H__21BAEB7B_E478_4ED1_B9F6_FDBCE620C55B__INCLUDED_)