/*
 * 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 __INDEX_TFILE_H__
#define __INDEX_TFILE_H__

#include "index.h"
#include "indexInt.h"
#include "index_fst.h"
#include "index_fst_counting_writer.h"
#include "index_tfile.h"
#include "tlockfree.h"

#ifdef __cplusplus
extern "C" {
#endif

// tfile header
// |<---suid--->|<---version--->|<--colLen-->|<-colName->|<---type-->|
// |<-uint64_t->|<---int32_t--->|<--int32_t->|<-colLen-->|<-uint8_t->|

typedef struct TFileReadHeader {
  uint64_t suid;
  int32_t  version;
  char     colName[128];  //
  uint8_t  colType;
} TFileReadHeader;

#define TFILE_HEADER_SIZE (sizeof(TFILE_HEADER_SIZE) + sizeof(uint32_t));
#define TFILE_HADER_PRE_SIZE (sizeof(uint64_t) + sizeof(int32_t) + sizeof(int32_t))

typedef struct TFileCacheKey {
  uint64_t    suid;
  uint8_t     colType;
  int32_t     version;
  const char *colName;
  int32_t     nColName;
} TFileCacheKey;

// table cache
// refactor to LRU cache later
typedef struct TFileCache {
  SHashObj *tableCache;
  int16_t   capacity;
  // add more param
} TFileCache;

typedef struct TFileWriter {
  FstBuilder *fb;
  WriterCtx * ctx;
} TFileWriter;

typedef struct TFileReader {
  T_REF_DECLARE()
  Fst *           fst;
  WriterCtx *     ctx;
  TFileReadHeader header;
} TFileReader;

typedef struct IndexTFile {
  char *       path;
  TFileCache * cache;
  TFileWriter *tw;
} IndexTFile;

typedef struct TFileWriterOpt {
  uint64_t suid;
  int8_t   colType;
  char *   colName;
  int32_t  nColName;
  int32_t  version;
} TFileWriterOpt;

typedef struct TFileReaderOpt {
  uint64_t suid;
  char *   colName;
  int32_t  nColName;
} TFileReaderOpt;

// tfile cache, manage tindex reader
TFileCache * tfileCacheCreate(const char *path);
void         tfileCacheDestroy(TFileCache *tcache);
TFileReader *tfileCacheGet(TFileCache *tcache, TFileCacheKey *key);
void         tfileCachePut(TFileCache *tcache, TFileCacheKey *key, TFileReader *reader);

TFileReader *tfileReaderCreate();
void         TFileReaderDestroy(TFileReader *reader);

TFileWriter *tfileWriterCreate(const char *suid, const char *colName);
void         tfileWriterDestroy(TFileWriter *tw);

//
IndexTFile *indexTFileCreate(const char *path);
int         indexTFilePut(void *tfile, SIndexTerm *term, uint64_t uid);
int         indexTFileSearch(void *tfile, SIndexTermQuery *query, SArray *result);

#ifdef __cplusplus
}

#endif

#endif