/*
 * 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/>.
 */

#include "tsdbUpgrade.h"

// old
extern void    tsdbGetCurrentFName(STsdb *pTsdb, char *current, char *current_t);
extern int32_t tsdbReadDataBlockEx(SDataFReader *pReader, SDataBlk *pDataBlk, SBlockData *pBlockData);

// new
extern int32_t save_fs(const TFileSetArray *arr, const char *fname);
extern int32_t current_fname(STsdb *pTsdb, char *fname, EFCurrentT ftype);
extern int32_t tsdbFileWriteBrinBlock(STsdbFD *fd, SBrinBlock *brinBlock, int8_t cmprAlg, int64_t *fileSize,
                                      TBrinBlkArray *brinBlkArray, uint8_t **bufArr);
extern int32_t tsdbFileWriteBrinBlk(STsdbFD *fd, TBrinBlkArray *brinBlkArray, SFDataPtr *ptr, int64_t *fileSize);
extern int32_t tsdbFileWriteHeadFooter(STsdbFD *fd, int64_t *fileSize, const SHeadFooter *footer);

static int32_t tsdbUpgradeHead(STsdb *tsdb, SDFileSet *pDFileSet, SDataFReader *reader, STFileSet *fset) {
  int32_t code = 0;
  int32_t lino = 0;

  struct {
    // config
    int32_t  maxRow;
    int8_t   cmprAlg;
    int32_t  szPage;
    uint8_t *bufArr[8];
    // reader
    SArray    *aBlockIdx;
    SMapData   mDataBlk[1];
    SBlockData blockData[1];
    // writer
    STsdbFD      *fd;
    SBrinBlock    brinBlock[1];
    TBrinBlkArray brinBlkArray[1];
    SHeadFooter   footer[1];
  } ctx[1] = {{
      .maxRow = tsdb->pVnode->config.tsdbCfg.maxRows,
      .cmprAlg = tsdb->pVnode->config.tsdbCfg.compression,
      .szPage = tsdb->pVnode->config.tsdbPageSize,
  }};

  if ((ctx->aBlockIdx = taosArrayInit(0, sizeof(SBlockIdx))) == NULL) {
    code = TSDB_CODE_OUT_OF_MEMORY;
    TSDB_CHECK_CODE(code, lino, _exit);
  }

  code = tsdbReadBlockIdx(reader, ctx->aBlockIdx);
  TSDB_CHECK_CODE(code, lino, _exit);

  if (taosArrayGetSize(ctx->aBlockIdx) == 0) {
    goto _exit;
  } else {
    STFile file = {
        .type = TSDB_FTYPE_HEAD,
        .did = pDFileSet->diskId,
        .fid = fset->fid,
        .cid = pDFileSet->pHeadF->commitID,
        .size = pDFileSet->pHeadF->size,
    };

    code = tsdbTFileObjInit(tsdb, &file, &fset->farr[TSDB_FTYPE_HEAD]);
    TSDB_CHECK_CODE(code, lino, _exit);

    // open fd
    char fname[TSDB_FILENAME_LEN];
    tsdbTFileName(tsdb, &file, fname);

    code = tsdbOpenFile(fname, ctx->szPage, TD_FILE_READ | TD_FILE_WRITE, &ctx->fd);
    TSDB_CHECK_CODE(code, lino, _exit);
  }

  for (int32_t iBlockIdx = 0; iBlockIdx < taosArrayGetSize(ctx->aBlockIdx); ++iBlockIdx) {
    SBlockIdx *pBlockIdx = taosArrayGet(ctx->aBlockIdx, iBlockIdx);

    code = tsdbReadDataBlk(reader, pBlockIdx, ctx->mDataBlk);
    TSDB_CHECK_CODE(code, lino, _exit);

    for (int32_t iDataBlk = 0; iDataBlk < ctx->mDataBlk->nItem; ++iDataBlk) {
      SDataBlk dataBlk[1];
      tMapDataGetItemByIdx(ctx->mDataBlk, iDataBlk, dataBlk, tGetDataBlk);

      SBrinRecord record = {
          .suid = pBlockIdx->suid,
          .uid = pBlockIdx->uid,
          .firstKey = dataBlk->minKey.ts,
          .firstKeyVer = dataBlk->minKey.version,
          .lastKey = dataBlk->maxKey.ts,
          .lastKeyVer = dataBlk->maxKey.version,
          .minVer = dataBlk->minVer,
          .maxVer = dataBlk->maxVer,
          .blockOffset = dataBlk->aSubBlock->offset,
          .smaOffset = dataBlk->smaInfo.offset,
          .blockSize = dataBlk->aSubBlock->szBlock,
          .blockKeySize = dataBlk->aSubBlock->szKey,
          .smaSize = dataBlk->smaInfo.size,
          .numRow = dataBlk->nRow,
          .count = dataBlk->nRow,
      };

      if (dataBlk->hasDup) {
        code = tsdbReadDataBlockEx(reader, dataBlk, ctx->blockData);
        TSDB_CHECK_CODE(code, lino, _exit);

        record.count = 1;
        for (int32_t i = 1; i < ctx->blockData->nRow; ++i) {
          if (ctx->blockData->aTSKEY[i] != ctx->blockData->aTSKEY[i - 1]) {
            record.count++;
          }
        }
      }

      code = tBrinBlockPut(ctx->brinBlock, &record);
      TSDB_CHECK_CODE(code, lino, _exit);

      if (BRIN_BLOCK_SIZE(ctx->brinBlock) >= ctx->maxRow) {
        code = tsdbFileWriteBrinBlock(ctx->fd, ctx->brinBlock, ctx->cmprAlg, &fset->farr[TSDB_FTYPE_HEAD]->f->size,
                                      ctx->brinBlkArray, ctx->bufArr);
        TSDB_CHECK_CODE(code, lino, _exit);
      }
    }
  }

  if (BRIN_BLOCK_SIZE(ctx->brinBlock) > 0) {
    code = tsdbFileWriteBrinBlock(ctx->fd, ctx->brinBlock, ctx->cmprAlg, &fset->farr[TSDB_FTYPE_HEAD]->f->size,
                                  ctx->brinBlkArray, ctx->bufArr);
    TSDB_CHECK_CODE(code, lino, _exit);
  }

  code =
      tsdbFileWriteBrinBlk(ctx->fd, ctx->brinBlkArray, ctx->footer->brinBlkPtr, &fset->farr[TSDB_FTYPE_HEAD]->f->size);
  TSDB_CHECK_CODE(code, lino, _exit);

  code = tsdbFileWriteHeadFooter(ctx->fd, &fset->farr[TSDB_FTYPE_HEAD]->f->size, ctx->footer);
  TSDB_CHECK_CODE(code, lino, _exit);

  code = tsdbFsyncFile(ctx->fd);
  TSDB_CHECK_CODE(code, lino, _exit);

  tsdbCloseFile(&ctx->fd);

_exit:
  if (code) {
    TSDB_ERROR_LOG(TD_VID(tsdb->pVnode), lino, code);
  }
  TARRAY2_DESTROY(ctx->brinBlkArray, NULL);
  tBrinBlockDestroy(ctx->brinBlock);
  tBlockDataDestroy(ctx->blockData);
  tMapDataClear(ctx->mDataBlk);
  taosArrayDestroy(ctx->aBlockIdx);
  for (int32_t i = 0; i < ARRAY_SIZE(ctx->bufArr); ++i) {
    tFree(ctx->bufArr[i]);
  }
  return code;
}

static int32_t tsdbUpgradeData(STsdb *tsdb, SDFileSet *pDFileSet, SDataFReader *reader, STFileSet *fset) {
  int32_t code = 0;
  int32_t lino = 0;

  // TODO

_exit:
  if (code) {
    TSDB_ERROR_LOG(TD_VID(tsdb->pVnode), lino, code);
  }
  return code;
}

static int32_t tsdbUpgradeSma(STsdb *tsdb, SDFileSet *pDFileSet, SDataFReader *reader, STFileSet *fset) {
  int32_t code = 0;
  int32_t lino = 0;

  // TODO

_exit:
  if (code) {
    TSDB_ERROR_LOG(TD_VID(tsdb->pVnode), lino, code);
  }
  return code;
}

static int32_t tsdbUpgradeStt(STsdb *tsdb, SDFileSet *pDFileSet, SDataFReader *reader, STFileSet *fset) {
  int32_t code = 0;
  int32_t lino = 0;

  // TODO

_exit:
  if (code) {
    TSDB_ERROR_LOG(TD_VID(tsdb->pVnode), lino, code);
  }
  return code;
}

static int32_t tsdbUpgradeFileSet(STsdb *tsdb, SDFileSet *pDFileSet, TFileSetArray *fileSetArray) {
  int32_t code = 0;
  int32_t lino = 0;

  SDataFReader *reader;
  STFileSet    *fset;

  code = tsdbTFileSetInit(pDFileSet->fid, &fset);
  TSDB_CHECK_CODE(code, lino, _exit);

  code = tsdbDataFReaderOpen(&reader, tsdb, pDFileSet);
  TSDB_CHECK_CODE(code, lino, _exit);

  // .head
  code = tsdbUpgradeHead(tsdb, pDFileSet, reader, fset);
  TSDB_CHECK_CODE(code, lino, _exit);

  // .data
  code = tsdbUpgradeData(tsdb, pDFileSet, reader, fset);
  TSDB_CHECK_CODE(code, lino, _exit);

  // .sma
  code = tsdbUpgradeSma(tsdb, pDFileSet, reader, fset);
  TSDB_CHECK_CODE(code, lino, _exit);

  // .stt
  if (pDFileSet->nSttF > 0) {
    code = tsdbUpgradeStt(tsdb, pDFileSet, reader, fset);
    TSDB_CHECK_CODE(code, lino, _exit);
  }

  tsdbDataFReaderClose(&reader);

  code = TARRAY2_APPEND(fileSetArray, fset);
  TSDB_CHECK_CODE(code, lino, _exit);

_exit:
  if (code) {
    TSDB_ERROR_LOG(TD_VID(tsdb->pVnode), lino, code);
  }
  return code;
}

static int32_t tsdbDumpTombDataToFSet(STsdb *tsdb, SDelFReader *reader, SArray *aDelIdx, STFileSet *fset) {
  int32_t code = 0;
  int32_t lino = 0;

  SArray       *aDelData = NULL;
  int64_t       minKey, maxKey;
  STombBlock    tombBlock[1] = {0};
  TTombBlkArray tombBlkArray[1] = {0};
  STsdbFD      *fd = NULL;

  tsdbFidKeyRange(fset->fid, tsdb->keepCfg.days, tsdb->keepCfg.precision, &minKey, &maxKey);

  if ((aDelData = taosArrayInit(0, sizeof(SDelData))) == NULL) {
    code = TSDB_CODE_OUT_OF_MEMORY;
    TSDB_CHECK_CODE(code, lino, _exit);
  }

  for (int32_t i = 0; i < taosArrayGetSize(aDelIdx); ++i) {
    SDelIdx *pDelIdx = taosArrayGet(aDelIdx, i);

    code = tsdbReadDelData(reader, pDelIdx, aDelData);
    TSDB_CHECK_CODE(code, lino, _exit);

    for (int32_t j = 0; j < taosArrayGetSize(aDelData); ++j) {
      SDelData *pDelData = taosArrayGet(aDelData, j);

      if (pDelData->sKey > maxKey || pDelData->eKey < minKey) {
        continue;
      }

      STombRecord record = {
          .suid = pDelIdx->suid,
          .uid = pDelIdx->uid,
          .version = pDelData->version,
          .skey = pDelData->sKey,
          .ekey = pDelData->eKey,
      };

      code = tTombBlockPut(tombBlock, &record);
      TSDB_CHECK_CODE(code, lino, _exit);

      if (TOMB_BLOCK_SIZE(tombBlock) >= tsdb->pVnode->config.tsdbCfg.maxRows) {
        if (fd == NULL) {
          STFile file = {
              .type = TSDB_FTYPE_TOMB,
              .did = {0},  // TODO
              .fid = fset->fid,
              .cid = 0,  // TODO
          };

          code = tsdbTFileObjInit(tsdb, &file, &fset->farr[TSDB_FTYPE_TOMB]);
          TSDB_CHECK_CODE(code, lino, _exit);

          code = tsdbOpenFile(fset->farr[TSDB_FTYPE_TOMB]->fname, tsdb->pVnode->config.tsdbPageSize,
                              TD_FILE_READ | TD_FILE_WRITE | TD_FILE_CREATE | TD_FILE_TRUNC, &fd);
          TSDB_CHECK_CODE(code, lino, _exit);

          uint8_t hdr[TSDB_FHDR_SIZE] = {0};
          code = tsdbWriteFile(fd, 0, hdr, TSDB_FHDR_SIZE);
          TSDB_CHECK_CODE(code, lino, _exit);
          fset->farr[TSDB_FTYPE_TOMB]->f->size += sizeof(hdr);
        }

        // TODO
        tTombBlockClear(tombBlock);
      }
    }
  }

  if (TOMB_BLOCK_SIZE(tombBlock) > 0) {
    // TODO
    tTombBlockClear(tombBlock);
  }

  if (TARRAY2_SIZE(tombBlkArray) > 0) {
    // TODO
  }

  if (fd) {
    // write footer

    // sync and close
    code = tsdbFsyncFile(fd);
    TSDB_CHECK_CODE(code, lino, _exit);
    tsdbCloseFile(&fd);
  }

  // clear
  TARRAY2_DESTROY(tombBlkArray, NULL);
  tTombBlockDestroy(tombBlock);
  taosArrayDestroy(aDelData);

_exit:
  if (code) {
    TSDB_ERROR_LOG(TD_VID(tsdb->pVnode), lino, code);
  }
  return code;
}

static int32_t tsdbUpgradeTombFile(STsdb *tsdb, SDelFile *pDelFile, TFileSetArray *fileSetArray) {
  int32_t code = 0;
  int32_t lino = 0;

  SDelFReader *reader = NULL;
  SArray      *aDelIdx = NULL;

  if ((aDelIdx = taosArrayInit(0, sizeof(SDelIdx))) == NULL) {
    code = TSDB_CODE_OUT_OF_MEMORY;
    TSDB_CHECK_CODE(code, lino, _exit);
  }

  code = tsdbDelFReaderOpen(&reader, pDelFile, tsdb);
  TSDB_CHECK_CODE(code, lino, _exit);

  code = tsdbReadDelIdx(reader, aDelIdx);
  TSDB_CHECK_CODE(code, lino, _exit);

  if (taosArrayGetSize(aDelIdx) > 0) {
    STFileSet *fset;
    TARRAY2_FOREACH(fileSetArray, fset) {
      code = tsdbDumpTombDataToFSet(tsdb, reader, aDelIdx, fset);
      TSDB_CHECK_CODE(code, lino, _exit);
    }
  }

  tsdbDelFReaderClose(&reader);
  taosArrayDestroy(aDelIdx);

_exit:
  if (code) {
    TSDB_ERROR_LOG(TD_VID(tsdb->pVnode), lino, code);
  }
  return code;
}

static int32_t tsdbDoUpgradeFileSystem(STsdb *tsdb, TFileSetArray *fileSetArray) {
  int32_t code = 0;
  int32_t lino = 0;

  // upgrade each file set
  for (int32_t i = 0; i < taosArrayGetSize(tsdb->fs.aDFileSet); i++) {
    code = tsdbUpgradeFileSet(tsdb, taosArrayGet(tsdb->fs.aDFileSet, i), fileSetArray);
    TSDB_CHECK_CODE(code, lino, _exit);
  }

  // upgrade tomb file
  if (tsdb->fs.pDelFile != NULL) {
    code = tsdbUpgradeTombFile(tsdb, tsdb->fs.pDelFile, fileSetArray);
    TSDB_CHECK_CODE(code, lino, _exit);
  }

_exit:
  if (code) {
    TSDB_ERROR_LOG(TD_VID(tsdb->pVnode), lino, code);
  }
  return code;
}

static int32_t tsdbUpgradeFileSystem(STsdb *tsdb, int8_t rollback) {
  int32_t code = 0;
  int32_t lino = 0;

  TFileSetArray fileSetArray[1] = {0};

  // open old file system
  code = tsdbFSOpen(tsdb, rollback);
  TSDB_CHECK_CODE(code, lino, _exit);

  code = tsdbDoUpgradeFileSystem(tsdb, fileSetArray);
  TSDB_CHECK_CODE(code, lino, _exit);

  // close file system
  code = tsdbFSClose(tsdb);
  TSDB_CHECK_CODE(code, lino, _exit);

  // save new file system
  char fname[TSDB_FILENAME_LEN];
  current_fname(tsdb, fname, TSDB_FCURRENT);
  code = save_fs(fileSetArray, fname);
  TSDB_CHECK_CODE(code, lino, _exit);

_exit:
  if (code) {
    TSDB_ERROR_LOG(TD_VID(tsdb->pVnode), lino, code);
  }
  TARRAY2_DESTROY(fileSetArray, tsdbTFileSetClear);
  return code;
}

int32_t tsdbCheckAndUpgradeFileSystem(STsdb *tsdb, int8_t rollback) {
  char fname[TSDB_FILENAME_LEN];

  tsdbGetCurrentFName(tsdb, fname, NULL);
  if (!taosCheckExistFile(fname)) return 0;

  int32_t code = tsdbUpgradeFileSystem(tsdb, rollback);
  if (code) return code;

  taosRemoveFile(fname);
  return 0;
}