/*
 * 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 TDENGINE_TSORT_H
#define TDENGINE_TSORT_H

#ifdef __cplusplus
extern "C" {
#endif

#include "os.h"
#include "tcommon.h"

enum {
  SORT_MULTISOURCE_MERGE = 0x1,
  SORT_SINGLESOURCE_SORT = 0x2,
  SORT_BLOCK_TS_MERGE = 0x3
};

typedef struct SMultiMergeSource {
  int32_t      type;
  int32_t      rowIndex;
  SSDataBlock* pBlock;
} SMultiMergeSource;

typedef struct SSortSource {
  SMultiMergeSource src;
  struct {
    SArray* pageIdList;
    int32_t pageIndex;
  };
  struct {
    void* param;
    bool  onlyRef;
  };
  int64_t fetchUs;
  int64_t fetchNum;
} SSortSource;

typedef struct SMsortComparParam {
  void**  pSources;
  int32_t numOfSources;
  SArray* orderInfo;  // SArray<SBlockOrderInfo>
  bool    cmpGroupId;

  int32_t sortType;
  // the following field to speed up when sortType == SORT_BLOCK_TS_MERGE
  int32_t tsSlotId;
  int32_t order;
  __compar_fn_t cmpFn;
} SMsortComparParam;

typedef struct SSortHandle  SSortHandle;
typedef struct STupleHandle STupleHandle;

typedef SSDataBlock* (*_sort_fetch_block_fn_t)(void* param);
typedef int32_t (*_sort_merge_compar_fn_t)(const void* p1, const void* p2, void* param);

/**
 *
 * @param type
 * @param maxRows keep maxRows at most, if 0, pq sort will not be used
 * @param maxTupleLength max len of one tuple, for check if pq sort is applicable
 * @param sortBufSize sort memory buf size, for check if heap sort is applicable
 * @return
 */
SSortHandle* tsortCreateSortHandle(SArray* pOrderInfo, int32_t type, int32_t pageSize, int32_t numOfPages,
                                   SSDataBlock* pBlock, const char* idstr, uint64_t pqMaxRows, uint32_t pqMaxTupleLength,
                                   uint32_t pqSortBufSize);

void tsortSetForceUsePQSort(SSortHandle* pHandle);

/**
 *
 * @param pSortHandle
 */
void tsortDestroySortHandle(SSortHandle* pSortHandle);

/**
 *
 * @param pHandle
 * @return
 */
int32_t tsortOpen(SSortHandle* pHandle);

/**
 *
 * @param pHandle
 * @return
 */
int32_t tsortClose(SSortHandle* pHandle);

/**
 *
 * @return
 */
int32_t tsortSetFetchRawDataFp(SSortHandle* pHandle, _sort_fetch_block_fn_t fetchFp, void (*fp)(SSDataBlock*, void*),
                               void* param);

/**
 *
 * @param pHandle
 * @param fp
 * @return
 */
int32_t tsortSetComparFp(SSortHandle* pHandle, _sort_merge_compar_fn_t fp);

/**
 * 
*/
void tsortSetMergeLimit(SSortHandle* pHandle, int64_t mergeLimit);
/**
 *
 */
int32_t tsortSetCompareGroupId(SSortHandle* pHandle, bool compareGroupId);

/**
 *
 * @param pHandle
 * @param pSource
 * @return success or failed
 */
int32_t tsortAddSource(SSortHandle* pSortHandle, void* pSource);

/**
 *
 * @param pHandle
 * @return
 */
STupleHandle* tsortNextTuple(SSortHandle* pHandle);

/**
 *
 * @param pHandle
 * @param colId
 * @return
 */
bool tsortIsNullVal(STupleHandle* pVHandle, int32_t colId);

/**
 *
 * @param pHandle
 * @param colId
 * @return
 */
void* tsortGetValue(STupleHandle* pVHandle, int32_t colId);

/**
 *
 * @param pVHandle
 * @return
 */
uint64_t tsortGetGroupId(STupleHandle* pVHandle);
void*    tsortGetBlockInfo(STupleHandle* pVHandle);
/**
 *
 * @param pSortHandle
 * @return
 */
SSDataBlock* tsortGetSortedDataBlock(const SSortHandle* pSortHandle);

/**
 * return the sort execution information.
 *
 * @param pHandle
 * @return
 */
SSortExecInfo tsortGetSortExecInfo(SSortHandle* pHandle);

/**
 * get proper sort buffer pages according to the row size
 * @param rowSize
 * @param numOfCols columns count that be put into page
 * @return
 */
int32_t getProperSortPageSize(size_t rowSize, uint32_t numOfCols);


bool tsortIsClosed(SSortHandle* pHandle);
void tsortSetClosed(SSortHandle* pHandle);

#ifdef __cplusplus
}
#endif

#endif  // TDENGINE_TSORT_H