/*
 * 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 "inc/tsdbFSet.h"

static int32_t stt_lvl_to_json(const SSttLvl *lvl, cJSON *json) {
  if (cJSON_AddNumberToObject(json, "level", lvl->level) == NULL) {
    return TSDB_CODE_OUT_OF_MEMORY;
  }

  cJSON *ajson = cJSON_AddArrayToObject(json, "files");
  if (ajson == NULL) return TSDB_CODE_OUT_OF_MEMORY;

  SRBTreeIter iter = tRBTreeIterCreate(&lvl->sttTree, 1);
  for (SRBTreeNode *node = tRBTreeIterNext(&iter); node; node = tRBTreeIterNext(&iter)) {
    STFileObj *fobj = TCONTAINER_OF(node, STFileObj, rbtn);

    cJSON *item = cJSON_CreateObject();
    if (item == NULL) return TSDB_CODE_OUT_OF_MEMORY;
    cJSON_AddItemToArray(ajson, item);

    int32_t code = tsdbTFileToJson(&fobj->f, item);
    if (code) return code;
  }

  return 0;
}

static int32_t stt_file_cmpr(const SRBTreeNode *n1, const SRBTreeNode *n2) {
  STFileObj *f1 = TCONTAINER_OF(n1, STFileObj, rbtn);
  STFileObj *f2 = TCONTAINER_OF(n2, STFileObj, rbtn);
  if (f1->f.cid < f2->f.cid) {
    return -1;
  } else if (f1->f.cid > f2->f.cid) {
    return 1;
  }
  return 0;
}

static int32_t stt_lvl_init(SSttLvl *lvl, int32_t level) {
  lvl->level = level;
  lvl->nstt = 0;
  tRBTreeCreate(&lvl->sttTree, stt_file_cmpr);
  return 0;
}

static int32_t add_file_to_stt_lvl(SSttLvl *lvl, STFileObj *fobj) {
  lvl->nstt++;
  tRBTreePut(&lvl->sttTree, &fobj->rbtn);
  return 0;
}

static int32_t json_to_stt_lvl(const cJSON *json, SSttLvl *lvl) {
  const cJSON *item1, *item2;

  item1 = cJSON_GetObjectItem(json, "level");
  if (cJSON_IsNumber(item1)) {
    lvl->level = item1->valuedouble;
  } else {
    return TSDB_CODE_FILE_CORRUPTED;
  }

  stt_lvl_init(lvl, lvl->level);

  item1 = cJSON_GetObjectItem(json, "files");
  if (cJSON_IsArray(item1)) {
    cJSON_ArrayForEach(item2, item1) {
      STFileObj *fobj;

      int32_t code = tsdbTFileObjCreate(&fobj);
      if (code) return code;

      code = tsdbJsonToTFile(item2, TSDB_FTYPE_STT, &fobj->f);
      if (code) return code;

      add_file_to_stt_lvl(lvl, fobj);
    }
  } else {
    return TSDB_CODE_FILE_CORRUPTED;
  }

  return 0;
}

static int32_t add_stt_lvl(STFileSet *fset, SSttLvl *lvl) {
  tRBTreePut(&fset->lvlTree, &lvl->rbtn);
  return 0;
}

static int32_t add_file_to_fset(STFileSet *fset, STFileObj *fobj) {
  if (fobj->f.type == TSDB_FTYPE_STT) {
    SSttLvl *lvl;
    SSttLvl  tlvl = {.level = fobj->f.stt.level};

    SRBTreeNode *node = tRBTreeGet(&fset->lvlTree, &tlvl.rbtn);
    if (node) {
      lvl = TCONTAINER_OF(node, SSttLvl, rbtn);
    } else {
      lvl = taosMemoryMalloc(sizeof(*lvl));
      if (!lvl) return TSDB_CODE_OUT_OF_MEMORY;

      stt_lvl_init(lvl, fobj->f.stt.level);
      add_stt_lvl(fset, lvl);
    }
    add_file_to_stt_lvl(lvl, fobj);
  } else {
    fset->farr[fobj->f.type] = fobj;
  }

  return 0;
}

static int32_t stt_lvl_cmpr(const SRBTreeNode *n1, const SRBTreeNode *n2) {
  SSttLvl *lvl1 = TCONTAINER_OF(n1, SSttLvl, rbtn);
  SSttLvl *lvl2 = TCONTAINER_OF(n2, SSttLvl, rbtn);

  if (lvl1->level < lvl2->level) {
    return -1;
  } else if (lvl1->level > lvl2->level) {
    return 1;
  }
  return 0;
}

static int32_t fset_init(STFileSet *fset, int32_t fid) {
  fset->fid = fid;
  for (int32_t ftype = TSDB_FTYPE_MIN; ftype < TSDB_FTYPE_MAX; ++ftype) {
    fset->farr[ftype] = NULL;
  }
  tRBTreeCreate(&fset->lvlTree, stt_lvl_cmpr);
  return 0;
}

static int32_t fset_clear(STFileSet *fset) {
  // TODO
  return 0;
}

int32_t tsdbFileSetToJson(const STFileSet *fset, cJSON *json) {
  int32_t code = 0;
  cJSON  *item1, *item2;

  // fid
  if (cJSON_AddNumberToObject(json, "fid", fset->fid) == NULL) {
    return TSDB_CODE_OUT_OF_MEMORY;
  }

  for (int32_t ftype = TSDB_FTYPE_MIN; ftype < TSDB_FTYPE_MAX; ++ftype) {
    if (fset->farr[ftype] == NULL) continue;

    code = tsdbTFileToJson(&fset->farr[ftype]->f, json);
    if (code) return code;
  }

  // each level
  item1 = cJSON_AddArrayToObject(json, "stt levels");
  if (item1 == NULL) return TSDB_CODE_OUT_OF_MEMORY;
  SRBTreeIter iter = tRBTreeIterCreate(&fset->lvlTree, 1);
  for (SRBTreeNode *node = tRBTreeIterNext(&iter); node; node = tRBTreeIterNext(&iter)) {
    item2 = cJSON_CreateObject();
    if (!item2) return TSDB_CODE_OUT_OF_MEMORY;
    cJSON_AddItemToArray(item1, item2);

    code = stt_lvl_to_json(TCONTAINER_OF(node, SSttLvl, rbtn), item2);
    if (code) return code;
  }

  return 0;
}

int32_t tsdbJsonToFileSet(const cJSON *json, STFileSet *fset) {
  const cJSON *item1, *item2;
  int32_t      code;
  STFile       tf;

  /* fid */
  item1 = cJSON_GetObjectItem(json, "fid");
  if (cJSON_IsNumber(item1)) {
    fset->fid = item1->valueint;
  } else {
    return TSDB_CODE_FILE_CORRUPTED;
  }

  fset_init(fset, fset->fid);
  for (int32_t ftype = TSDB_FTYPE_MIN; ftype < TSDB_FTYPE_MAX; ++ftype) {
    code = tsdbJsonToTFile(json, ftype, &tf);
    if (code == TSDB_CODE_NOT_FOUND) {
      continue;
    } else if (code) {
      return code;
    } else {
      code = tsdbTFileObjCreate(&fset->farr[ftype]);
      if (code) return code;
      fset->farr[ftype]->f = tf;
    }
  }

  // each level
  item1 = cJSON_GetObjectItem(json, "stt");
  if (cJSON_IsArray(item1)) {
    cJSON_ArrayForEach(item2, item1) {
      SSttLvl *lvl = taosMemoryCalloc(1, sizeof(*lvl));
      if (lvl == NULL) return TSDB_CODE_OUT_OF_MEMORY;

      code = json_to_stt_lvl(item2, lvl);
      if (code) {
        taosMemoryFree(lvl);
        return code;
      }

      add_stt_lvl(fset, lvl);
    }
  } else {
    return TSDB_CODE_FILE_CORRUPTED;
  }

  return 0;
}

int32_t tsdbFSetCmprFn(const STFileSet *pSet1, const STFileSet *pSet2) {
  if (pSet1->fid < pSet2->fid) return -1;
  if (pSet1->fid > pSet2->fid) return 1;
  return 0;
}

int32_t tsdbFileSetEdit(STFileSet *fset, const STFileOp *op) {
  int32_t code = 0;

  if (op->oState.size == 0  //
      || 0                  /* TODO*/
  ) {
    STFileObj *fobj;
    code = tsdbTFileObjCreate(&fobj);
    if (code) return code;
    fobj->f = op->nState;
    add_file_to_fset(fset, fobj);
  } else if (op->nState.size == 0) {
    // delete
    ASSERT(0);
  } else {
    // modify
    ASSERT(0);
  }
  return 0;
}

int32_t tsdbFileSetInit(STFileSet *pSet, int32_t fid) { return fset_init(pSet, fid); }

int32_t tsdbFileSetClear(STFileSet *pSet) {
  // TODO
  return 0;
}