/* Copyright (C) 2014 InfiniDB, Inc.

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License
   as published by the Free Software Foundation; version 2 of
   the License.

   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.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
   MA 02110-1301, USA. */

/******************************************************************************************
 * $Id: we_index.h 4450 2013-01-21 14:13:24Z rdempsey $
 *
 ******************************************************************************************/
/** @file */

#pragma once

#include <bitset>

#include "we_type.h"

/** Namespace WriteEngine */
namespace WriteEngine
{
/*****************************************************
 * index definition
 ******************************************************/
const int IDX_BITTEST_SIZE = 10; /** @brief The bit size of bit test */
const int IDX_GROUP_SIZE = 3;    /** @brief The bit size of group */
const int IDX_INSTRU_SIZE = 4;   /** @brief The bit size of instruction */
const int IDX_PTR_SIZE = 46;     /** @brief The bit size of address pointer */
const int IDX_TYPE_SIZE = 3;     /** @brief The bit size of type */

const int IDX_BITMAP_SUBBLOCK_NO = 1;       /** @brief Subblock 1 of root block is for bitmap pointer*/
const int IDX_MAX_TREE_LEVEL = 128;         /** @brief The maximum depth of a tree */
const int IDX_MAX_MULTI_COL_BIT = 256;      /** @brief The maximum bits of a multi-column tree (256 bit)*/
const int IDX_MAX_MULTI_COL_IDX_LEVEL = 52; /** @brief The maximum depth of a multi-column tree */
const int IDX_MAX_MULTI_COL_IDX_NUM = 64; /** @brief The maximum number of columns for a multi-column index */
const int MAX_IDX_RID = 1024;             /** @brief Maximum index rids for one shot */
const int IDX_DEFAULT_READ_ROW = 10000;   /** @brief Default number of rows for one read for index */

// todo: need to move a higher level share file for dictionary
const int RID_SIZE = 46;
//   const int   OID_SIZE                = 24;                /** @brief The bit size of object id */
const int FBO_SIZE = 36;  /** @brief The bit size of file block offset */
const int SBID_SIZE = 5;  /** @brief The bit size of sub block id */
const int ENTRY_SIZE = 5; /** @brief The bit size of entry location with a sub block  */

const int LIST_SIZE_TYPE = 0;
const int LIST_RID_TYPE = 3;
const int LIST_NOT_USED_TYPE = 7;
const int LIST_HDR_SIZE = 32;
const int LIST_SUBBLOCK_TYPE = 4;
const int LIST_BLOCK_TYPE = 5;
const int LIST_LLP_TYPE = 6;
const int SUBBLOCK_TOTAL_BYTES = 256;
const int LIST_SUB_LLP_POS = 31;
const int LIST_LAST_LBID_POS = 30;
const int LIST_BLOCK_LLP_POS = 1023;
const int MAX_BLOCK_ENTRY = 1024;
const int MAX_SUB_RID_CNT = 30;
const int MAX_BLK_RID_CNT = 1023;
const int MAX_BLK_NARRAY_RID_CNT = 1018;
const int LBID_SBID_ENTRY = 46;
const int RID_COUNT_SIZE = 10;
const int CUR_BLK_POS_WIDTH = 2;
const int LLP_STATUS_WIDTH = 2;
const int LIST_ENTRY_WIDTH = 8;
const int LIST_BLK_LLP_ENTRY_WIDTH = 48;
const int BEGIN_LIST_BLK_LLP_POS = 1018;
const int NEXT_BLK_PTR_OFFSET = 5;
const int PARENT_PTR_OFFSET = 4;
const int TOTAL_NUM_ARRAY_PTR = 4;
const int ARRAY_LLP_EXIST = 1;
const int LLP_NOT_FULL = 0;
const int LLP_FULL = 1;
const int TOTAL_CUR_LEVEL = 10;
const int CUR_LEVEL_POS_WIDTH = 20;
const uint64_t INVALID_KEY = -1LL; /** @brief Invalid number */

/*****************************************************
 * mask definition
 ******************************************************/
const int BIT_MASK_ARRAY[] = {
    0x0,  0x01, /** @brief 1 bit mask */
    0x03,       /** @brief 2 bit mask */
    0x07,       /** @brief 3 bit mask */
    0x0F,       /** @brief 4 bit mask */
    0x1F,       /** @brief 5 bit mask */
    0x3F        /** @brief 6 bit mask */
};

/************************************************************************
 * Type enumerations
 ************************************************************************/
enum IdxTreeEntryType /** @brief Index tree entry types */
{
  EMPTY_ENTRY = 0, /** @brief Empty entry */
  UNIQUE_VAL = 7,  /** @brief Unique value */
  EMPTY_LIST = 1,  /** @brief Empty list pointer entry */
  EMPTY_PTR = 2,   /** @brief Empty pointer entry */
  BIT_TEST = 3,    /** @brief Bit test entry */
  LEAF_LIST = 4,   /** @brief Leaf list pointer */
  BITMAP_PTR = 5,  /** @brief Bitmap pointer */
                   //      SORT_LIST               = 5,           /** @brief Sorted list pointer */
  MULTI_COL = 6    /** @brief Multi-column index pointer */
};

enum IdxTreeGroupType /** @brief Index tree group types */
{
  ENTRY_1 = 0,  /** @brief 1 entry per group */
  ENTRY_2 = 1,  /** @brief 2 entry per group */
  ENTRY_4 = 2,  /** @brief 4 entry per group */
  ENTRY_8 = 3,  /** @brief 8 entry per group */
  ENTRY_16 = 4, /** @brief 16 entry per group */
  ENTRY_32 = 5, /** @brief 32 entry per group */
  ENTRY_BLK = 6 /** @brief 1k entry per group */
};

enum IdxBitCompareType /** @brief Index bit compare types */
{
  BIT_5 = 0, /** @brief 5-bit compare */
  BIT_10 = 1 /** @brief 10-bit compare */
};

enum IdxFreeMgrType /** @brief Index free manager types */
{
  TREE = 0, /** @brief Index tree type */
  LIST = 1  /** @brief Index list type */
};

/************************************************************************
 * @brief index defintions
 ************************************************************************/
typedef struct
{
  uint64_t type : IDX_TYPE_SIZE;   /** @brief entry type */
  uint64_t spare : 12;             /** @brief spare bits */
  uint64_t group : IDX_GROUP_SIZE; /** @brief entry group type */
                                   // The following is related to ptr
  uint64_t fbo : FBO_SIZE;         /** @brief file block offset */
  uint64_t sbid : SBID_SIZE;       /** @brief sub block id */
  uint64_t entry : ENTRY_SIZE;     /** @brief entry within sub block */
} IdxStartSubBlockEntry;           /** @brief Index start block entry structure */

typedef struct
{
  uint64_t type : IDX_TYPE_SIZE;   /** @brief entry type */
  uint64_t spare : 2;              /** @brief spare bits */
  uint64_t group : IDX_GROUP_SIZE; /** @brief entry group type */
  // The following is related to ptr
  uint64_t spare2 : 10;        /** @brief spare bits */
  uint64_t fbo : FBO_SIZE;     /** @brief file block offset */
  uint64_t sbid : SBID_SIZE;   /** @brief sub block id */
  uint64_t entry : ENTRY_SIZE; /** @brief entry within sub block */
} IdxEmptyListEntry;           /** @brief Index empty list entry structure */

typedef struct
{
  uint64_t type : IDX_TYPE_SIZE; /** @brief entry type */
  uint64_t spare : 15;           /** @brief spare bits */
                                 // The following is related to ptr
  uint64_t fbo : FBO_SIZE;       /** @brief file block offset */
  uint64_t sbid : SBID_SIZE;     /** @brief sub block id */
  uint64_t entry : ENTRY_SIZE;   /** @brief entry within sub block */
} IdxBitmapPointerEntry;         /** @brief Index bitmap pointer entry structure */

typedef struct
{
  uint64_t type : IDX_TYPE_SIZE;       /** @brief entry type */
  uint64_t bitTest : IDX_BITTEST_SIZE; /** @brief index bittest  */
  uint64_t group : IDX_GROUP_SIZE;     /** @brief entry group type */
  uint64_t bitCompare : 1;
  uint64_t spare : 1;          /** @brief spare bits */
                               // The following is related to ptr
  uint64_t fbo : FBO_SIZE;     /** @brief file block offset */
  uint64_t sbid : SBID_SIZE;   /** @brief sub block id */
  uint64_t entry : ENTRY_SIZE; /** @brief entry within sub block */
} IdxBitTestEntry;             /** @brief Index bit test entry structure */

typedef struct
{
  uint64_t type : IDX_TYPE_SIZE; /** @brief entry type */
  uint64_t spare : 15;           /** @brief spare bits */
                                 // The following is related to ptr
  uint64_t fbo : FBO_SIZE;       /** @brief file block offset */
  uint64_t sbid : SBID_SIZE;     /** @brief sub block id */
  uint64_t entry : ENTRY_SIZE;   /** @brief entry within sub block */
} IdxTreePointerEntry;           /** @brief Index tree pointer entry structure */
/************************************************************************
 * @brief index list node defintions
 ************************************************************************/
typedef struct
{
  uint64_t type : IDX_TYPE_SIZE; /** @brief entry type 3 */
  uint64_t spare : 15;           /** @brief spare bits */
  RID rid : RID_SIZE;            /** @brief row id */
} IdxRidListEntry;               /** @brief Index rid list entry structure */

typedef struct
{
  uint64_t type : IDX_TYPE_SIZE; /** @brief entry type */
  uint64_t spare : 5;
  uint64_t count : RID_COUNT_SIZE; /** the count of rids on the current blk */
  uint64_t llp : LBID_SBID_ENTRY;  /** @brief size */
} IdxRidListPtr;

typedef struct
{
  uint64_t type : IDX_TYPE_SIZE; /** @brief entry type */
  uint64_t spare : 5;
  uint64_t count : RID_COUNT_SIZE; /** the count of rids on the current blk */
  uint64_t lbid : FBO_SIZE;        /** @brief size */
  uint64_t sbid : SBID_SIZE;       /** @brief sub block id */
  uint64_t entry : ENTRY_SIZE;     /** @brief entry within sub block */
} IdxRidLastListPtr;

typedef struct
{
  uint64_t type : IDX_TYPE_SIZE; /** @brief entry type */
  uint64_t spare : 13;
  uint64_t llpStat : LLP_STATUS_WIDTH; /** llp status */
  uint64_t childLbid : FBO_SIZE;       /** @brief file block offset */
  uint64_t spare2 : 10;
} IdxRidChildListPtr;

typedef struct
{
  uint64_t type : IDX_TYPE_SIZE; /** @brief entry type 0 or 6 */
  uint64_t spare : 5;
  uint64_t count : RID_COUNT_SIZE; /** the count of rids on the current blk */
  uint64_t nextLbid : FBO_SIZE;    /** @brief file block offset */
  uint64_t curLevel : TOTAL_CUR_LEVEL;
} IdxRidNextListPtr;

typedef struct
{
  uint64_t type : IDX_TYPE_SIZE; /** @brief entry type 6*/
  uint64_t spare : 3;            /** @brief spare bits */
  uint64_t curLevelPos : CUR_LEVEL_POS_WIDTH;
  uint64_t curBlkPos : CUR_BLK_POS_WIDTH; /** the position of current blk */
  uint64_t parentLbid : FBO_SIZE;         /** @brief file block offset */
} IdxRidParentListPtr;

typedef struct
{
  IdxRidChildListPtr childIdxRidListPtr[4];
  IdxRidParentListPtr parentIdxListPtr;
  IdxRidNextListPtr nextIdxListPtr;
} IdxRidListArrayPtr;

/************************************************************************
 * @brief index list header defintions
 ************************************************************************/
typedef struct
{
  uint64_t type : IDX_TYPE_SIZE; /** @brief entry type */
  uint64_t spare : 15;           /** @brief spare bits */
  uint64_t size : RID_SIZE;      /** @brief size */
} IdxRidListHdrSize;

typedef struct
{
  uint64_t type : IDX_TYPE_SIZE; /** @brief entry type */
  uint64_t spare : 15;           /** @brief spare bits */
  uint64_t llp : RID_SIZE;       /** @brief size */
} IdxRidListHdrPtr;

typedef struct
{
  IdxRidListHdrSize idxRidListSize;
  uint64_t key;
  IdxRidListEntry firstIdxRidListEntry;
  IdxRidListHdrPtr nextIdxRidListPtr;
} IdxRidListHdr;

typedef struct
{
  uint64_t part1 : 15; /** @brief entry type */
  uint64_t part2 : 15; /** @brief spare bits */
  uint64_t spare : 34; /** @brief size */
} IdxRidListOffSet;
/************************************************************************
 * @brief index tree node defintions
 ************************************************************************/
typedef struct
{
  IdxBitTestEntry next;    /** @brief next in the node */
  IdxBitTestEntry current; /** @brief current addr */
  uint16_t level;          /** @brief tree level */
  uint16_t allocCount;     /** @brief allocated entry cound from free mgr */
  uint16_t useCount;       /** @brief actual use entry count */
  uint16_t offset;         /** @brief entry offset */
  bool used;               /** @brief used flag */
} IdxTreeNode;             /** @brief Index tree node */

typedef struct
{
  IdxTreeNode node[IDX_MAX_TREE_LEVEL]; /** @brief node array */
  uint16_t maxLevel;                    /** @brief max level */
  RID rid;                              /** @brief current row id */
  uint64_t key;                         /** @brief current key */
  uint16_t width;                       /** @brief current width */
} IdxTree;                              /** @brief Index tree */

struct IdxTreeCacheNode
{
  RID rid;                 /** @brief RID */
  uint64_t key;            /** @brief Key */
  IdxEmptyListEntry entry; /** @brief List pointer */
  bool used;               /** @brief Used flag */
  IdxTreeCacheNode()
  {
    used = false;
  }
};

struct IdxMultiColKey
{
  std::bitset<IDX_MAX_MULTI_COL_BIT> bitSet;       /** @brief BitArray for all bits */
  std::bitset<IDX_MAX_MULTI_COL_BIT> curBitset;    /** @brief Current working column */
  std::bitset<IDX_MAX_MULTI_COL_BIT> curMask;      /** @brief Current bitset mask */
  unsigned char keyBuf[IDX_MAX_MULTI_COL_BIT / 8]; /** @brief Key buffer */
  int curLevel;                                    /** @brief Current index level */
  int maxLevel;                                    /** @brief Maximum index level */
  int totalBit;                                    /** @brief Total bits */
  int testbitArray[IDX_MAX_MULTI_COL_IDX_LEVEL];   /** @brief Test bit array */
  void clear()
  {
    bitSet.reset();
    curBitset.reset();
    curMask.reset();
    curLevel = maxLevel = 0;
    totalBit = 0;
    memset(testbitArray, 0, IDX_MAX_MULTI_COL_IDX_LEVEL * sizeof(testbitArray[0]));
    memset(keyBuf, 0, IDX_MAX_MULTI_COL_BIT / 8);
    curMask = 0x1F;
    curMask = curMask << (IDX_MAX_MULTI_COL_BIT - 5);
  }
  IdxMultiColKey()
  {
    clear();
  }
};
struct IdxMultiRid
{
  RID* ridArray; /** @brief RID array */
  int totalRid;  /** @brief Total number of row id */
  IdxMultiRid()
  {
    totalRid = 0;
    ridArray = NULL;
  }
  void setMultiRid(RID* rids, const int size)
  {
    totalRid = size;
    ridArray = rids;
    /*                        ridArray = new RID[size];
                            memcpy( ridArray, rids, size * sizeof( RID ) ); */
  }
  void clearMultiRid()
  {  /*if( ridArray != NULL ) delete [] ridArray; ridArray = NULL;*/
  }  // we don't want to get into this mem business
};

struct IdxLoadParam
{
  File sourceFile; /** @brief Source file contatin values */

  OID indexTreeOid;                                             /** @brief Target index tree oid */
  OID indexListOid;                                             /** @brief Target index list oid */
  execplan::CalpontSystemCatalog::ColDataType indexColDataType; /** @brief Target index column type */
  int indexWidth;                                               /** @brief Target index width */

  int maxLoadRow; /** @brief Max rows for one load */

  void setIdxLoadParam(const OID treeOid, const OID listOid,
                       const execplan::CalpontSystemCatalog::ColDataType colDataType, const int width,
                       const int maxRow)
  {
    indexTreeOid = treeOid;
    indexListOid = listOid;
    indexColDataType = colDataType;
    indexWidth = width;
    maxLoadRow = maxRow;
  }
  bool isValid()
  {
    return indexTreeOid && indexListOid && indexWidth && maxLoadRow;
  }
  IdxLoadParam()
  {
    indexTreeOid = indexListOid = indexWidth = maxLoadRow = 0;
  }
};

}  // namespace WriteEngine