/*
 * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
 *
 * This program is free software: you can use, redistribute, and/or modify
 * it under the terms of the GNU Affero General Public License, version 3
 * or later ("AGPL"), as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef _TD_VNODE_SMA_H_
#define _TD_VNODE_SMA_H_

#include "vnodeInt.h"

#ifdef __cplusplus
extern "C" {
#endif

// smaDebug ================
// clang-format off
#define smaFatal(...) do { if (smaDebugFlag & DEBUG_FATAL) { taosPrintLog("SMA FATAL ", DEBUG_FATAL, 255, __VA_ARGS__); }}     while(0)
#define smaError(...) do { if (smaDebugFlag & DEBUG_ERROR) { taosPrintLog("SMA ERROR ", DEBUG_ERROR, 255, __VA_ARGS__); }}     while(0)
#define smaWarn(...)  do { if (smaDebugFlag & DEBUG_WARN)  { taosPrintLog("SMA WARN ", DEBUG_WARN, 255, __VA_ARGS__); }}       while(0)
#define smaInfo(...)  do { if (smaDebugFlag & DEBUG_INFO)  { taosPrintLog("SMA ", DEBUG_INFO, 255, __VA_ARGS__); }}            while(0)
#define smaDebug(...) do { if (smaDebugFlag & DEBUG_DEBUG) { taosPrintLog("SMA ", DEBUG_DEBUG, tsdbDebugFlag, __VA_ARGS__); }} while(0)
#define smaTrace(...) do { if (smaDebugFlag & DEBUG_TRACE) { taosPrintLog("SMA ", DEBUG_TRACE, tsdbDebugFlag, __VA_ARGS__); }} while(0)
// clang-format on

#define RSMA_TASK_INFO_HASH_SLOT (8)

typedef struct SSmaEnv       SSmaEnv;
typedef struct SSmaStat      SSmaStat;
typedef struct STSmaStat     STSmaStat;
typedef struct SRSmaStat     SRSmaStat;
typedef struct SRSmaRef      SRSmaRef;
typedef struct SRSmaInfo     SRSmaInfo;
typedef struct SRSmaInfoItem SRSmaInfoItem;
typedef struct SRSmaFS       SRSmaFS;
typedef struct SQTaskFile    SQTaskFile;
typedef struct SQTaskFReader SQTaskFReader;
typedef struct SQTaskFWriter SQTaskFWriter;

struct SSmaEnv {
  SRWLatch  lock;
  int8_t    type;
  int8_t    flag;  // 0x01 inClose
  SSmaStat *pStat;
};

#define SMA_ENV_FLG_CLOSE ((int8_t)0x1)

struct SRSmaRef {
  int64_t refId;  // for SRSmaStat
  int64_t suid;
};

typedef struct {
  int8_t  inited;
  int32_t rsetId;
  void   *tmrHandle;  // shared by all fetch tasks
  /**
   * @brief key: void* of SRSmaInfoItem, value: SRSmaRef
   *  N.B. Although there is a very small possibility that "void*" point to different objects while with the same
   * address after release/renew, the functionality is not affected as it just used to fetch the rsma results.
   */
  SHashObj *refHash;  // shared by all vgroups
} SSmaMgmt;

#define SMA_ENV_LOCK(env)  (&(env)->lock)
#define SMA_ENV_TYPE(env)  ((env)->type)
#define SMA_ENV_STAT(env)  ((env)->pStat)
#define SMA_RSMA_STAT(sma) ((SRSmaStat *)SMA_ENV_STAT((SSmaEnv *)(sma)->pRSmaEnv))

struct STSmaStat {
  int8_t    state;  // ETsdbSmaStat
  STSma    *pTSma;  // cache schema
  STSchema *pTSchema;
};

struct SQTaskFile {
  volatile int32_t nRef;
  int32_t          padding;
  int64_t          version;
  int64_t          size;
};

struct SQTaskFReader {
  SSma     *pSma;
  int64_t   version;
  TdFilePtr pReadH;
};
struct SQTaskFWriter {
  SSma     *pSma;
  int64_t   version;
  TdFilePtr pWriteH;
  char     *fname;
};

struct SRSmaFS {
  SArray *aQTaskInf;  // array of SQTaskFile
};

struct SRSmaStat {
  SSma            *pSma;
  int64_t          commitAppliedVer;  // vnode applied version for async commit
  int64_t          refId;             // shared by fetch tasks
  volatile int64_t nBufItems;         // number of items in queue buffer
  SRWLatch         lock;              // r/w lock for rsma fs(e.g. qtaskinfo)
  volatile int32_t nFetchAll;         // active number of fetch all
  int8_t           triggerStat;       // shared by fetch tasks
  int8_t           commitStat;        // 0 not in committing, 1 in committing
  SRSmaFS          fs;                // for recovery/snapshot r/w
  SHashObj        *infoHash;          // key: suid, value: SRSmaInfo
  tsem_t           notEmpty;          // has items in queue buffer
};

struct SSmaStat {
  union {
    STSmaStat tsmaStat;  // time-range-wise sma
    SRSmaStat rsmaStat;  // rollup sma
  };
  T_REF_DECLARE()
  char data[];
};

#define SMA_STAT_TSMA(s)     (&(s)->tsmaStat)
#define SMA_STAT_RSMA(s)     (&(s)->rsmaStat)
#define RSMA_INFO_HASH(r)    ((r)->infoHash)
#define RSMA_TRIGGER_STAT(r) (&(r)->triggerStat)
#define RSMA_COMMIT_STAT(r)  (&(r)->commitStat)
#define RSMA_REF_ID(r)       ((r)->refId)
#define RSMA_FS(r)           (&(r)->fs)
#define RSMA_FS_LOCK(r)      (&(r)->lock)

struct SRSmaInfoItem {
  int8_t   level : 4;
  int8_t   fetchLevel : 4;
  int8_t   triggerStat;
  uint16_t nSkipped;
  int32_t  maxDelay;  // ms
  tmr_h    tmrId;
};

struct SRSmaInfo {
  SSma     *pSma;
  STSchema *pTSchema;
  int64_t   suid;
  int64_t   lastRecv;  // ms
  int8_t    assigned;  // 0 idle, 1 assgined for exec
  int8_t    delFlag;
  int16_t   padding;
  T_REF_DECLARE()
  SRSmaInfoItem items[TSDB_RETENTION_L2];
  void         *taskInfo[TSDB_RETENTION_L2];   // qTaskInfo_t
  STaosQueue   *queue;                         // buffer queue of SubmitReq
  STaosQall    *qall;                          // buffer qall of SubmitReq
  void         *iTaskInfo[TSDB_RETENTION_L2];  // immutable qTaskInfo_t
  STaosQueue   *iQueue;                        // immutable buffer queue of SubmitReq
  STaosQall    *iQall;                         // immutable buffer qall of SubmitReq
};

#define RSMA_INFO_HEAD_LEN     offsetof(SRSmaInfo, items)
#define RSMA_INFO_IS_DEL(r)    ((r)->delFlag == 1)
#define RSMA_INFO_SET_DEL(r)   ((r)->delFlag = 1)
#define RSMA_INFO_QTASK(r, i)  ((r)->taskInfo[i])
#define RSMA_INFO_IQTASK(r, i) ((r)->iTaskInfo[i])
#define RSMA_INFO_ITEM(r, i)   (&(r)->items[i])

enum {
  TASK_TRIGGER_STAT_INIT = 0,
  TASK_TRIGGER_STAT_ACTIVE = 1,
  TASK_TRIGGER_STAT_INACTIVE = 2,
  TASK_TRIGGER_STAT_PAUSED = 3,
  TASK_TRIGGER_STAT_CANCELLED = 4,
  TASK_TRIGGER_STAT_DROPPED = 5,
};

enum {
  RSMA_RESTORE_REBOOT = 1,
  RSMA_RESTORE_SYNC = 2,
};

typedef enum {
  RSMA_EXEC_OVERFLOW = 1,  // triggered by queue buf overflow
  RSMA_EXEC_TIMEOUT = 2,   // triggered by timer
  RSMA_EXEC_COMMIT = 3,    // triggered by commit
} ERsmaExecType;

// sma
int32_t tdCheckAndInitSmaEnv(SSma *pSma, int8_t smaType);
void    tdDestroySmaEnv(SSmaEnv *pSmaEnv);
void   *tdFreeSmaEnv(SSmaEnv *pSmaEnv);
int32_t tdRefSmaStat(SSma *pSma, SSmaStat *pStat);
int32_t tdUnRefSmaStat(SSma *pSma, SSmaStat *pStat);
int32_t tdLockSma(SSma *pSma);
int32_t tdUnLockSma(SSma *pSma);
void   *tdAcquireSmaRef(int32_t rsetId, int64_t refId);
int32_t tdReleaseSmaRef(int32_t rsetId, int64_t refId);

// rsma
int32_t tdRefRSmaInfo(SSma *pSma, SRSmaInfo *pRSmaInfo);
int32_t tdUnRefRSmaInfo(SSma *pSma, SRSmaInfo *pRSmaInfo);
void   *tdFreeRSmaInfo(SSma *pSma, SRSmaInfo *pInfo, bool isDeepFree);
int32_t tdRSmaFSOpen(SSma *pSma, int64_t version);
void    tdRSmaFSClose(SRSmaFS *fs);
int32_t tdRSmaFSRef(SSma *pSma, SRSmaStat *pStat, int64_t version);
void    tdRSmaFSUnRef(SSma *pSma, SRSmaStat *pStat, int64_t version);
int32_t tdRSmaFSUpsertQTaskFile(SRSmaFS *pFS, SQTaskFile *qTaskFile);
int32_t tdRSmaRestore(SSma *pSma, int8_t type, int64_t committedVer);
int32_t tdRSmaProcessCreateImpl(SSma *pSma, SRSmaParam *param, int64_t suid, const char *tbName);
int32_t tdRSmaProcessExecImpl(SSma *pSma, ERsmaExecType type);
int32_t tdRSmaPersistExecImpl(SRSmaStat *pRSmaStat, SHashObj *pInfoHash);
int32_t tdRSmaProcessRestoreImpl(SSma *pSma, int8_t type, int64_t qtaskFileVer);

void tdRSmaQTaskInfoGetFileName(int32_t vid, int64_t version, char *outputName);
void tdRSmaQTaskInfoGetFullName(int32_t vid, int64_t version, const char *path, char *outputName);

// smaFileUtil ================

#define TD_FILE_HEAD_SIZE 512

typedef struct STFInfo STFInfo;
typedef struct STFile  STFile;

struct STFInfo {
  // common fields
  uint32_t magic;
  uint32_t ftype;
  uint32_t fver;
  int64_t  fsize;
};

enum {
  TD_FTYPE_RSMA_QTASKINFO = 0,
};

struct STFile {
  uint8_t   state;
  STFInfo   info;
  char     *fname;
  TdFilePtr pFile;
};

#define TD_TFILE_PFILE(tf)        ((tf)->pFile)
#define TD_TFILE_OPENED(tf)       (TD_TFILE_PFILE(tf) != NULL)
#define TD_TFILE_FULL_NAME(tf)    ((tf)->fname)
#define TD_TFILE_OPENED(tf)       (TD_TFILE_PFILE(tf) != NULL)
#define TD_TFILE_CLOSED(tf)       (!TD_TFILE_OPENED(tf))
#define TD_TFILE_SET_CLOSED(f)    (TD_TFILE_PFILE(f) = NULL)
#define TD_TFILE_SET_STATE(tf, s) ((tf)->state = (s))

int32_t tdInitTFile(STFile *pTFile, const char *dname, const char *fname);
int32_t tdCreateTFile(STFile *pTFile, bool updateHeader, int8_t fType);
int32_t tdOpenTFile(STFile *pTFile, int flags);
int64_t tdReadTFile(STFile *pTFile, void *buf, int64_t nbyte);
int64_t tdSeekTFile(STFile *pTFile, int64_t offset, int whence);
int64_t tdWriteTFile(STFile *pTFile, void *buf, int64_t nbyte);
int64_t tdAppendTFile(STFile *pTFile, void *buf, int64_t nbyte, int64_t *offset);
int64_t tdGetTFileSize(STFile *pTFile, int64_t *size);
int32_t tdRemoveTFile(STFile *pTFile);
int32_t tdLoadTFileHeader(STFile *pTFile, STFInfo *pInfo);
int32_t tdUpdateTFileHeader(STFile *pTFile);
void    tdUpdateTFileMagic(STFile *pTFile, void *pCksm);
void    tdCloseTFile(STFile *pTFile);
void    tdDestroyTFile(STFile *pTFile);

void tdGetVndFileName(int32_t vgId, const char *pdname, const char *dname, const char *fname, int64_t version,
                      char *outputName);
void tdGetVndDirName(int32_t vgId, const char *pdname, const char *dname, bool endWithSep, char *outputName);

#ifdef __cplusplus
}
#endif

#endif /*_TD_VNODE_SMA_H_*/
