/*
 * 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_DATA_FORMAT_H_
#define _TD_DATA_FORMAT_H_

#include <stdint.h>
#include <stdlib.h>
#include <string.h>

#include "talgo.h"
#include "taosdef.h"
#include "tutil.h"

#ifdef __cplusplus
extern "C" {
#endif

#define STR_TO_VARSTR(x, str)             \
  do {                                    \
    VarDataLenT __len = strlen(str);      \
    *(VarDataLenT *)(x) = __len;          \
    strncpy(varDataVal(x), (str), __len); \
  } while (0);

#define STR_WITH_MAXSIZE_TO_VARSTR(x, str, _maxs)      \
  do {                                                 \
    char *_e = stpncpy(varDataVal(x), (str), (_maxs)); \
    varDataSetLen(x, (_e - (x)-VARSTR_HEADER_SIZE));   \
  } while (0)

#define STR_WITH_SIZE_TO_VARSTR(x, str, _size) \
  do {                                         \
    *(VarDataLenT *)(x) = (_size);             \
    strncpy(varDataVal(x), (str), (_size));    \
  } while (0);

// ----------------- TSDB COLUMN DEFINITION
typedef struct {
  int8_t  type;    // Column type
  int16_t colId;   // column ID
  int32_t bytes;   // column bytes
  int32_t offset;  // point offset in SDataRow after the header part
} STColumn;

#define colType(col) ((col)->type)
#define colColId(col) ((col)->colId)
#define colBytes(col) ((col)->bytes)
#define colOffset(col) ((col)->offset)

#define colSetType(col, t) (colType(col) = (t))
#define colSetColId(col, id) (colColId(col) = (id))
#define colSetBytes(col, b) (colBytes(col) = (b))
#define colSetOffset(col, o) (colOffset(col) = (o))

// ----------------- TSDB SCHEMA DEFINITION
typedef struct {
  int      version;    // version
  int      numOfCols;  // Number of columns appended
  int      tlen;       // maximum length of a SDataRow without the header part
  int      flen;       // First part length in a SDataRow after the header part
  STColumn columns[];
} STSchema;

#define schemaNCols(s) ((s)->numOfCols)
#define schemaVersion(s) ((s)->version)
#define schemaTLen(s) ((s)->tlen)
#define schemaFLen(s) ((s)->flen)
#define schemaColAt(s, i) ((s)->columns + i)
#define tdFreeSchema(s) tfree((s))

STSchema *tdDupSchema(STSchema *pSchema);
void *    tdEncodeSchema(void *dst, STSchema *pSchema);
STSchema *tdDecodeSchema(void **psrc);

static FORCE_INLINE int comparColId(const void *key1, const void *key2) {
  if (*(int16_t *)key1 > ((STColumn *)key2)->colId) {
    return 1;
  } else if (*(int16_t *)key1 < ((STColumn *)key2)->colId) {
    return -1;
  } else {
    return 0;
  }
}

static FORCE_INLINE STColumn *tdGetColOfID(STSchema *pSchema, int16_t colId) {
  void *ptr = bsearch(&colId, (void *)pSchema->columns, schemaNCols(pSchema), sizeof(STColumn), comparColId);
  if (ptr == NULL) return NULL;
  return (STColumn *)ptr;
}

// ----------------- SCHEMA BUILDER DEFINITION
typedef struct {
  int       tCols;
  int       nCols;
  int       tlen;
  int       flen;
  int       version;
  STColumn *columns;
} STSchemaBuilder;

int       tdInitTSchemaBuilder(STSchemaBuilder *pBuilder, int32_t version);
void      tdDestroyTSchemaBuilder(STSchemaBuilder *pBuilder);
void      tdResetTSchemaBuilder(STSchemaBuilder *pBuilder, int32_t version);
int       tdAddColToSchema(STSchemaBuilder *pBuilder, int8_t type, int16_t colId, int32_t bytes);
STSchema *tdGetSchemaFromBuilder(STSchemaBuilder *pBuilder);

// ----------------- Data row structure

/* A data row, the format is like below:
 * |<--------------------+--------------------------- len ---------------------------------->|
 * |<--     Head      -->|<---------   flen -------------->|                                 |
 * +---------------------+---------------------------------+---------------------------------+
 * | int16_t  |  int16_t |                                 |                                 |
 * +----------+----------+---------------------------------+---------------------------------+
 * |   len    | sversion |           First part            |             Second part         |
 * +----------+----------+---------------------------------+---------------------------------+
 */
typedef void *SDataRow;

#define TD_DATA_ROW_HEAD_SIZE sizeof(int16_t)*2

#define dataRowLen(r) (*(int16_t *)(r))
#define dataRowVersion(r) *(int16_t *)POINTER_SHIFT(r, sizeof(int16_t))
#define dataRowTuple(r) POINTER_SHIFT(r, TD_DATA_ROW_HEAD_SIZE)
#define dataRowKey(r) (*(TSKEY *)(dataRowTuple(r)))
#define dataRowSetLen(r, l) (dataRowLen(r) = (l))
#define dataRowSetVersion(r, v) (dataRowVersion(r) = (v))
#define dataRowCpy(dst, r) memcpy((dst), (r), dataRowLen(r))
#define dataRowMaxBytesFromSchema(s) (schemaTLen(s) + TD_DATA_ROW_HEAD_SIZE)

SDataRow tdNewDataRowFromSchema(STSchema *pSchema);
void     tdFreeDataRow(SDataRow row);
void     tdInitDataRow(SDataRow row, STSchema *pSchema);
SDataRow tdDataRowDup(SDataRow row);

static FORCE_INLINE int tdAppendColVal(SDataRow row, void *value, int8_t type, int32_t bytes, int32_t offset) {
  ASSERT(value != NULL);
  int32_t toffset = offset + TD_DATA_ROW_HEAD_SIZE;
  char *  ptr = (char *)POINTER_SHIFT(row, dataRowLen(row));

  switch (type) {
    case TSDB_DATA_TYPE_BINARY:
    case TSDB_DATA_TYPE_NCHAR:
      *(VarDataOffsetT *)POINTER_SHIFT(row, toffset) = dataRowLen(row);
      memcpy(ptr, value, varDataTLen(value));
      dataRowLen(row) += varDataTLen(value);
      break;
    default:
      memcpy(POINTER_SHIFT(row, toffset), value, TYPE_BYTES[type]);
      break;
  }

  return 0;
}

// NOTE: offset here including the header size
static FORCE_INLINE void *tdGetRowDataOfCol(SDataRow row, int8_t type, int32_t offset) {
  switch (type) {
    case TSDB_DATA_TYPE_BINARY:
    case TSDB_DATA_TYPE_NCHAR:
      return POINTER_SHIFT(row, *(VarDataOffsetT *)POINTER_SHIFT(row, offset));
    default:
      return POINTER_SHIFT(row, offset);
  }
}

// ----------------- Data column structure
typedef struct SDataCol {
  int8_t          type;       // column type
  int16_t         colId;      // column ID
  int             bytes;      // column data bytes defined
  int             offset;     // data offset in a SDataRow (including the header size)
  int             spaceSize;  // Total space size for this column
  int             len;        // column data length
  VarDataOffsetT *dataOff;    // For binary and nchar data, the offset in the data column
  void *          pData;      // Actual data pointer
} SDataCol;

static FORCE_INLINE void dataColReset(SDataCol *pDataCol) { pDataCol->len = 0; }

void dataColInit(SDataCol *pDataCol, STColumn *pCol, void **pBuf, int maxPoints);
void dataColAppendVal(SDataCol *pCol, void *value, int numOfRows, int maxPoints);
void dataColPopPoints(SDataCol *pCol, int pointsToPop, int numOfRows);
void dataColSetOffset(SDataCol *pCol, int nEle);

bool isNEleNull(SDataCol *pCol, int nEle);
void dataColSetNEleNull(SDataCol *pCol, int nEle, int maxPoints);

// Get the data pointer from a column-wised data
static FORCE_INLINE void *tdGetColDataOfRow(SDataCol *pCol, int row) {
  switch (pCol->type) {
    case TSDB_DATA_TYPE_BINARY:
    case TSDB_DATA_TYPE_NCHAR:
      return POINTER_SHIFT(pCol->pData, pCol->dataOff[row]);
      break;

    default:
      return POINTER_SHIFT(pCol->pData, TYPE_BYTES[pCol->type] * row);
      break;
  }
}

static FORCE_INLINE int32_t dataColGetNEleLen(SDataCol *pDataCol, int rows) {
  ASSERT(rows > 0);

  switch (pDataCol->type) {
    case TSDB_DATA_TYPE_BINARY:
    case TSDB_DATA_TYPE_NCHAR:
      return pDataCol->dataOff[rows - 1] + varDataTLen(tdGetColDataOfRow(pDataCol, rows - 1));
      break;
    default:
      return TYPE_BYTES[pDataCol->type] * rows;
  }
}

typedef struct {
  int maxRowSize;
  int maxCols;    // max number of columns
  int maxPoints;  // max number of points
  int bufSize;

  int      numOfRows;
  int      numOfCols;  // Total number of cols
  int      sversion;   // TODO: set sversion
  void *   buf;
  SDataCol cols[];
} SDataCols;

#define keyCol(pCols) (&((pCols)->cols[0]))  // Key column
#define dataColsKeyAt(pCols, idx) ((TSKEY *)(keyCol(pCols)->pData))[(idx)]
#define dataColsKeyFirst(pCols) dataColsKeyAt(pCols, 0)
#define dataColsKeyLast(pCols) ((pCols->numOfRows == 0) ? 0 : dataColsKeyAt(pCols, (pCols)->numOfRows - 1))

SDataCols *tdNewDataCols(int maxRowSize, int maxCols, int maxRows);
void       tdResetDataCols(SDataCols *pCols);
void       tdInitDataCols(SDataCols *pCols, STSchema *pSchema);
SDataCols *tdDupDataCols(SDataCols *pCols, bool keepData);
void       tdFreeDataCols(SDataCols *pCols);
void       tdAppendDataRowToDataCol(SDataRow row, STSchema *pSchema, SDataCols *pCols);
void       tdPopDataColsPoints(SDataCols *pCols, int pointsToPop);  //!!!!
int        tdMergeDataCols(SDataCols *target, SDataCols *src, int rowsToMerge);
void       tdMergeTwoDataCols(SDataCols *target, SDataCols *src1, int *iter1, SDataCols *src2, int *iter2, int tRows);

// ----------------- K-V data row structure
/*
 * +----------+----------+---------------------------------+---------------------------------+
 * |  int16_t |  int16_t |                                 |                                 |
 * +----------+----------+---------------------------------+---------------------------------+
 * |    len   |   ncols  |           cols index            |             data part           |
 * +----------+----------+---------------------------------+---------------------------------+
 */
typedef void *SKVRow;

typedef struct {
  int16_t colId;
  int16_t offset;
} SColIdx;

#define TD_KV_ROW_HEAD_SIZE 2 * sizeof(int16_t)

#define kvRowLen(r) (*(int16_t *)(r))
#define kvRowNCols(r) (*(int16_t *)POINTER_SHIFT(r, sizeof(int16_t)))
#define kvRowSetLen(r, len) kvRowLen(r) = (len)
#define kvRowSetNCols(r, n) kvRowNCols(r) = (n)
#define kvRowColIdx(r) (SColIdx *)POINTER_SHIFT(r, TD_KV_ROW_HEAD_SIZE)
#define kvRowValues(r) POINTER_SHIFT(r, TD_KV_ROW_HEAD_SIZE + sizeof(SColIdx) * kvRowNCols(r))
#define kvRowCpy(dst, r) memcpy((dst), (r), kvRowLen(r))
#define kvRowColVal(r, colIdx) POINTER_SHIFT(kvRowValues(r), (colIdx)->offset)
#define kvRowColIdxAt(r, i) (kvRowColIdx(r) + (i))
#define kvRowFree(r) tfree(r)
#define kvRowEnd(r) POINTER_SHIFT(r, kvRowLen(r))

SKVRow tdKVRowDup(SKVRow row);
int    tdSetKVRowDataOfCol(SKVRow *orow, int16_t colId, int8_t type, void *value);
void * tdEncodeKVRow(void *buf, SKVRow row);
void * tdDecodeKVRow(void *buf, SKVRow *row);

static FORCE_INLINE int comparTagId(const void *key1, const void *key2) {
  if (*(int16_t *)key1 > ((SColIdx *)key2)->colId) {
    return 1;
  } else if (*(int16_t *)key1 < ((SColIdx *)key2)->colId) {
    return -1;
  } else {
    return 0;
  }
}

static FORCE_INLINE void *tdGetKVRowValOfCol(SKVRow row, int16_t colId) {
  void *ret = taosbsearch(&colId, kvRowColIdx(row), kvRowNCols(row), sizeof(SColIdx), comparTagId, TD_EQ);
  if (ret == NULL) return NULL;
  return kvRowColVal(row, (SColIdx *)ret);
}

// ----------------- K-V data row builder
typedef struct {
  int16_t  tCols;
  int16_t  nCols;
  SColIdx *pColIdx;
  int16_t  alloc;
  int16_t  size;
  void *   buf;
} SKVRowBuilder;

int    tdInitKVRowBuilder(SKVRowBuilder *pBuilder);
void   tdDestroyKVRowBuilder(SKVRowBuilder *pBuilder);
void   tdResetKVRowBuilder(SKVRowBuilder *pBuilder);
SKVRow tdGetKVRowFromBuilder(SKVRowBuilder *pBuilder);

static FORCE_INLINE int tdAddColToKVRow(SKVRowBuilder *pBuilder, int16_t colId, int8_t type, void *value) {
  ASSERT(pBuilder->nCols == 0 || colId > pBuilder->pColIdx[pBuilder->nCols - 1].colId);

  if (pBuilder->nCols >= pBuilder->tCols) {
    pBuilder->tCols *= 2;
    pBuilder->pColIdx = (SColIdx *)realloc((void *)(pBuilder->pColIdx), sizeof(SColIdx) * pBuilder->tCols);
    if (pBuilder->pColIdx == NULL) return -1;
  }

  pBuilder->pColIdx[pBuilder->nCols].colId = colId;
  pBuilder->pColIdx[pBuilder->nCols].offset = pBuilder->size;

  pBuilder->nCols++;

  int tlen = IS_VAR_DATA_TYPE(type) ? varDataTLen(value) : TYPE_BYTES[type];
  if (tlen > pBuilder->alloc - pBuilder->size) {
    while (tlen > pBuilder->alloc - pBuilder->size) {
      pBuilder->alloc *= 2;
    }
    pBuilder->buf = realloc(pBuilder->buf, pBuilder->alloc);
    if (pBuilder->buf == NULL) return -1;
  }

  memcpy(POINTER_SHIFT(pBuilder->buf, pBuilder->size), value, tlen);
  pBuilder->size += tlen;

  return 0;
}

#ifdef __cplusplus
}
#endif

#endif  // _TD_DATA_FORMAT_H_