/*
 * 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_TSDB_H_
#define _TD_TSDB_H_

#include <pthread.h>
#include <stdbool.h>
#include <stdint.h>

#include "taosdef.h"
#include "taosmsg.h"
#include "tarray.h"
#include "tdataformat.h"
#include "tname.h"
#include "hash.h"
#include "tlockfree.h"
#include "tlist.h"

#ifdef __cplusplus
extern "C" {
#endif

#define TSDB_VERSION_MAJOR 1
#define TSDB_VERSION_MINOR 0

#define TSDB_INVALID_SUPER_TABLE_ID -1

#define TSDB_STATUS_COMMIT_START 1
#define TSDB_STATUS_COMMIT_OVER 2
#define TSDB_STATUS_COMMIT_NOBLOCK 3 //commit no block, need to be solved 

// TSDB STATE DEFINITION
#define TSDB_STATE_OK 0x0
#define TSDB_STATE_BAD_META 0x1
#define TSDB_STATE_BAD_DATA 0x2

// --------- TSDB APPLICATION HANDLE DEFINITION
typedef struct {
  void *appH;
  void *cqH;
  int (*notifyStatus)(void *, int status, int eno);
  int (*eventCallBack)(void *);
  void *(*cqCreateFunc)(void *handle, uint64_t uid, int32_t sid, const char *dstTable, char *sqlStr, STSchema *pSchema, int start);
  void (*cqDropFunc)(void *handle);
} STsdbAppH;

// --------- TSDB REPOSITORY CONFIGURATION DEFINITION
typedef struct {
  int32_t tsdbId;
  int32_t cacheBlockSize;
  int32_t totalBlocks;
  int32_t daysPerFile;  // day per file sharding policy
  int32_t keep;         // day of data to keep
  int32_t keep1;
  int32_t keep2;
  int32_t minRowsPerFileBlock;  // minimum rows per file block
  int32_t maxRowsPerFileBlock;  // maximum rows per file block
  int8_t  precision;
  int8_t  compression;
  int8_t  update;
  int8_t  cacheLastRow;    // 0:no cache, 1: cache last row, 2: cache last NULL column 3: 1&2
} STsdbCfg;

#define CACHE_NO_LAST(c)          ((c)->cacheLastRow == 0)
#define CACHE_LAST_ROW(c)         (((c)->cacheLastRow & 1) > 0)
#define CACHE_LAST_NULL_COLUMN(c) (((c)->cacheLastRow & 2) > 0)

// --------- TSDB REPOSITORY USAGE STATISTICS
typedef struct {
  int64_t totalStorage;  // total bytes occupie
  int64_t compStorage;
  int64_t pointsWritten;  // total data points written
} STsdbStat;

typedef struct STsdbRepo STsdbRepo;

STsdbCfg *tsdbGetCfg(const STsdbRepo *repo);

// --------- TSDB REPOSITORY DEFINITION
int32_t    tsdbCreateRepo(int repoid);
int32_t    tsdbDropRepo(int repoid);
STsdbRepo *tsdbOpenRepo(STsdbCfg *pCfg, STsdbAppH *pAppH);
int        tsdbCloseRepo(STsdbRepo *repo, int toCommit);
int32_t    tsdbConfigRepo(STsdbRepo *repo, STsdbCfg *pCfg);
int        tsdbGetState(STsdbRepo *repo);
int8_t     tsdbGetCompactState(STsdbRepo *repo);
// --------- TSDB TABLE DEFINITION
typedef struct {
  uint64_t uid;  // the unique table ID
  int32_t  tid;  // the table ID in the repository.
} STableId;

// --------- TSDB TABLE configuration
typedef struct {
  ETableType type;
  char *     name;
  STableId   tableId;
  int32_t    sversion;
  char *     sname;  // super table name
  uint64_t   superUid;
  STSchema * schema;
  STSchema * tagSchema;
  SKVRow     tagValues;
  char *     sql;
} STableCfg;

void tsdbClearTableCfg(STableCfg *config);

void *tsdbGetTableTagVal(const void *pTable, int32_t colId, int16_t type);
char *tsdbGetTableName(void *pTable);

#define TSDB_TABLEID(_table) ((STableId*) (_table))
#define TSDB_PREV_ROW  0x1
#define TSDB_NEXT_ROW  0x2

STableCfg *tsdbCreateTableCfgFromMsg(SMDCreateTableMsg *pMsg);

int tsdbCreateTable(STsdbRepo *repo, STableCfg *pCfg);
int tsdbDropTable(STsdbRepo *pRepo, STableId tableId);
int tsdbUpdateTableTagValue(STsdbRepo *repo, SUpdateTableTagValMsg *pMsg);

uint32_t tsdbGetFileInfo(STsdbRepo *repo, char *name, uint32_t *index, uint32_t eindex, int64_t *size);

// the TSDB repository info
typedef struct STsdbRepoInfo {
  STsdbCfg tsdbCfg;
  uint64_t version;            // version of the repository
  int64_t  tsdbTotalDataSize;  // the original inserted data size
  int64_t  tsdbTotalDiskSize;  // the total disk size taken by this TSDB repository
  // TODO: Other informations to add
} STsdbRepoInfo;
STsdbRepoInfo *tsdbGetStatus(STsdbRepo *pRepo);

// the meter information report structure
typedef struct {
  STableCfg tableCfg;
  uint64_t  version;
  int64_t   tableTotalDataSize;  // In bytes
  int64_t   tableTotalDiskSize;  // In bytes
} STableInfo;

// -- FOR INSERT DATA
/**
 * Insert data to a table in a repository
 * @param pRepo the TSDB repository handle
 * @param pData the data to insert (will give a more specific description)
 *
 * @return the number of points inserted, -1 for failure and the error number is set
 */
int32_t tsdbInsertData(STsdbRepo *repo, SSubmitMsg *pMsg, SShellSubmitRspMsg *pRsp);

// -- FOR QUERY TIME SERIES DATA

typedef void *TsdbQueryHandleT;  // Use void to hide implementation details

#define BLOCK_LOAD_OFFSET_SEQ_ORDER   1
#define BLOCK_LOAD_TABLE_SEQ_ORDER    2
#define BLOCK_LOAD_TABLE_RR_ORDER     3

// query condition to build multi-table data block iterator
typedef struct STsdbQueryCond {
  STimeWindow  twindow;
  int32_t      order;             // desc|asc order to iterate the data block
  int64_t      offset;            // skip offset put down to tsdb
  int32_t      numOfCols;
  SColumnInfo *colList;
  bool         loadExternalRows;  // load external rows or not
  int32_t      type;              // data block load type:
} STsdbQueryCond;

typedef struct STableData STableData;
typedef struct {
  T_REF_DECLARE()
  SRWLatch     latch;
  TSKEY        keyFirst;
  TSKEY        keyLast;
  int64_t      numOfRows;
  int32_t      maxTables;
  STableData **tData;
  SList *      actList;
  SList *      extraBuffList;
  SList *      bufBlockList;
  int64_t      pointsAdd;   // TODO
  int64_t      storageAdd;  // TODO
} SMemTable;

typedef struct {
  SMemTable* mem;
  SMemTable* imem;
  SMemTable  mtable;
  SMemTable* omem;
} SMemSnapshot;

typedef struct SMemRef {
  int32_t      ref;
  SMemSnapshot snapshot;
} SMemRef;

typedef struct SDataBlockInfo {
  STimeWindow window;
  int32_t     rows;
  int32_t     numOfCols;
  int64_t     uid;
  int32_t     tid;
} SDataBlockInfo;

typedef struct SFileBlockInfo {
  int32_t numBlocksOfStep;
} SFileBlockInfo;

typedef struct {
  void *pTable;
  TSKEY lastKey;
} STableKeyInfo;

typedef struct {
  uint32_t  numOfTables;
  SArray   *pGroupList;
  SHashObj *map;  // speedup acquire the tableQueryInfo by table uid
  int32_t sVersion;
  int32_t tVersion;
} STableGroupInfo;

#define TSDB_BLOCK_DIST_STEP_ROWS 16
typedef struct {
  uint16_t  rowSize;
  uint16_t  numOfFiles;
  uint32_t  numOfTables;
  uint64_t  totalSize;
  uint64_t  totalRows;
  int32_t   maxRows;
  int32_t   minRows;
  int32_t   firstSeekTimeUs;
  uint32_t  numOfRowsInMemTable;
  uint32_t  numOfSmallBlocks;
  SArray   *dataBlockInfos;
} STableBlockDist;

/**
 * Get the data block iterator, starting from position according to the query condition
 *
 * @param tsdb       tsdb handle
 * @param pCond      query condition, including time window, result set order, and basic required columns for each block
 * @param tableInfoGroup  table object list in the form of set, grouped into different sets according to the
 *                        group by condition
 * @param qinfo      query info handle from query processor
 * @return
 */
TsdbQueryHandleT *tsdbQueryTables(STsdbRepo *tsdb, STsdbQueryCond *pCond, STableGroupInfo *tableInfoGroup, uint64_t qId,
                                  SMemRef *pRef);

/**
 * Get the last row of the given query time window for all the tables in STableGroupInfo object.
 * Note that only one data block with only row will be returned while invoking retrieve data block function for
 * all tables in this group.
 *
 * @param tsdb   tsdb handle
 * @param pCond  query condition, including time window, result set order, and basic required columns for each block
 * @param tableInfo  table list.
 * @return
 */
TsdbQueryHandleT tsdbQueryLastRow(STsdbRepo *tsdb, STsdbQueryCond *pCond, STableGroupInfo *tableInfo, uint64_t qId,
                                  SMemRef *pRef);


TsdbQueryHandleT tsdbQueryCacheLast(STsdbRepo *tsdb, STsdbQueryCond *pCond, STableGroupInfo *groupList, uint64_t qId, SMemRef* pMemRef);

bool isTsdbCacheLastRow(TsdbQueryHandleT* pQueryHandle);


/**
 * get the queried table object list
 * @param pHandle
 * @return
 */
SArray *tsdbGetQueriedTableList(TsdbQueryHandleT *pHandle);

/**
 * get the group list according to table id from client
 * @param tsdb
 * @param pCond
 * @param groupList
 * @param qinfo
 * @return
 */
TsdbQueryHandleT tsdbQueryRowsInExternalWindow(STsdbRepo *tsdb, STsdbQueryCond *pCond, STableGroupInfo *groupList,
                                               uint64_t qId, SMemRef *pRef);


/**
 * get num of rows in mem table 
 *
 * @param pHandle
 * @return row size
 */

int64_t tsdbGetNumOfRowsInMemTable(TsdbQueryHandleT* pHandle);

/**
 * move to next block if exists 
 *
 * @param pQueryHandle
 * @return
 */
bool tsdbNextDataBlock(TsdbQueryHandleT pQueryHandle);

/**
 * Get current data block information
 *
 * @param pQueryHandle
 * @param pBlockInfo
 * @return
 */
void tsdbRetrieveDataBlockInfo(TsdbQueryHandleT *pQueryHandle, SDataBlockInfo *pBlockInfo);

/**
 *
 * Get the pre-calculated information w.r.t. current data block.
 *
 * In case of data block in cache, the pBlockStatis will always be NULL.
 * If a block is not completed loaded from disk, the pBlockStatis will be NULL.

 * @pBlockStatis the pre-calculated value for current data blocks. if the block is a cache block, always return 0
 * @return
 */
int32_t tsdbRetrieveDataBlockStatisInfo(TsdbQueryHandleT *pQueryHandle, SDataStatis **pBlockStatis);

/**
 *
 * The query condition with primary timestamp is passed to iterator during its constructor function,
 * the returned data block must be satisfied with the time window condition in any cases,
 * which means the SData data block is not actually the completed disk data blocks.
 *
 * @param pQueryHandle      query handle
 * @param pColumnIdList     required data columns id list
 * @return
 */
SArray *tsdbRetrieveDataBlock(TsdbQueryHandleT *pQueryHandle, SArray *pColumnIdList);

/**
 * Get the qualified table id for a super table according to the tag query expression.
 * @param stableid. super table sid
 * @param pTagCond. tag query condition
 */
int32_t tsdbQuerySTableByTagCond(STsdbRepo *tsdb, uint64_t uid, TSKEY key, const char *pTagCond, size_t len,
                                 STableGroupInfo *pGroupList, SColIndex *pColIndex, int32_t numOfCols);

/**
 * destroy the created table group list, which is generated by tag query
 * @param pGroupList
 */
void tsdbDestroyTableGroup(STableGroupInfo *pGroupList);

/**
 * create the table group result including only one table, used to handle the normal table query
 *
 * @param tsdb        tsdbHandle
 * @param uid         table uid
 * @param pGroupInfo  the generated result
 * @return
 */
int32_t tsdbGetOneTableGroup(STsdbRepo *tsdb, uint64_t uid, TSKEY startKey, STableGroupInfo *pGroupInfo);

/**
 *
 * @param tsdb
 * @param pTableIdList
 * @param pGroupInfo
 * @return
 */
int32_t tsdbGetTableGroupFromIdList(STsdbRepo *tsdb, SArray *pTableIdList, STableGroupInfo *pGroupInfo);

/**
 * clean up the query handle
 * @param queryHandle
 */
void tsdbCleanupQueryHandle(TsdbQueryHandleT queryHandle);

void tsdbResetQueryHandle(TsdbQueryHandleT queryHandle, STsdbQueryCond *pCond);

void tsdbResetQueryHandleForNewTable(TsdbQueryHandleT queryHandle, STsdbQueryCond *pCond, STableGroupInfo* groupList);

int32_t tsdbGetFileBlocksDistInfo(TsdbQueryHandleT* queryHandle, STableBlockDist* pTableBlockInfo);

// obtain queryHandle attribute
int64_t tsdbSkipOffset(TsdbQueryHandleT queryHandle);

/**
 * get the statistics of repo usage
 * @param repo. point to the tsdbrepo
 * @param totalPoints. total data point written
 * @param totalStorage. total bytes took by the tsdb
 * @param compStorage. total bytes took by the tsdb after compressed
 */
void tsdbReportStat(void *repo, int64_t *totalPoints, int64_t *totalStorage, int64_t *compStorage);

int  tsdbInitCommitQueue();
void tsdbDestroyCommitQueue();
int  tsdbSyncCommit(STsdbRepo *repo);
void tsdbIncCommitRef(int vgId);
void tsdbDecCommitRef(int vgId);
void tsdbSwitchTable(TsdbQueryHandleT pQueryHandle);

// For TSDB file sync
int tsdbSyncSend(void *pRepo, SOCKET socketFd);
int tsdbSyncRecv(void *pRepo, SOCKET socketFd);

// For TSDB Compact
int tsdbCompact(STsdbRepo *pRepo);

// For TSDB Health Monitor

// no problem return true
bool tsdbNoProblem(STsdbRepo* pRepo);
// unit of walSize: MB
int tsdbCheckWal(STsdbRepo *pRepo, uint32_t walSize);

// for json tag
void* getJsonTagValueElment(void* data, char* key, int32_t keyLen, char* out, int16_t bytes);
void getJsonTagValueAll(void* data, void* dst, int16_t bytes);
char* parseTagDatatoJson(void *p);

//
// scan callback 
//

// type define
#define READ_TABLE    1
#define READ_QUERY    2
typedef bool (*readover_callback)(void* param, int8_t type, int32_t tid);
void tsdbAddScanCallback(TsdbQueryHandleT* queryHandle, readover_callback callback, void* param);

#ifdef __cplusplus
}
#endif

#endif  // _TD_TSDB_H_
