/*
 * 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 "vnd.h"

int32_t vnodeCreate(const char *path, SVnodeCfg *pCfg, STfs *pTfs) {
  SVnodeInfo info = {0};
  char       dir[TSDB_FILENAME_LEN] = {0};

  // check config
  if (vnodeCheckCfg(pCfg) < 0) {
    vError("vgId:%d, failed to create vnode since:%s", pCfg->vgId, tstrerror(terrno));
    return -1;
  }

  // create vnode env
  if (pTfs) {
    if (tfsMkdirAt(pTfs, path, (SDiskID){0}) < 0) {
      vError("vgId:%d, failed to create vnode since:%s", pCfg->vgId, tstrerror(terrno));
      return -1;
    }
    snprintf(dir, TSDB_FILENAME_LEN, "%s%s%s", tfsGetPrimaryPath(pTfs), TD_DIRSEP, path);
  } else {
    if (taosMkDir(path)) {
      return TAOS_SYSTEM_ERROR(errno);
    }
    snprintf(dir, TSDB_FILENAME_LEN, "%s", path);
  }

  if (pCfg) {
    info.config = *pCfg;
  } else {
    info.config = vnodeCfgDefault;
  }
  info.state.committed = -1;
  info.state.applied = -1;
  info.state.commitID = 0;

  if (vnodeSaveInfo(dir, &info) < 0 || vnodeCommitInfo(dir, &info) < 0) {
    vError("vgId:%d, failed to save vnode config since %s", pCfg ? pCfg->vgId : 0, tstrerror(terrno));
    return -1;
  }

  vInfo("vgId:%d, vnode is created", info.config.vgId);
  return 0;
}

int32_t vnodeAlter(const char *path, SAlterVnodeReplicaReq *pReq, STfs *pTfs) {
  SVnodeInfo info = {0};
  char       dir[TSDB_FILENAME_LEN] = {0};
  int32_t    ret = 0;

  if (pTfs) {
    snprintf(dir, TSDB_FILENAME_LEN, "%s%s%s", tfsGetPrimaryPath(pTfs), TD_DIRSEP, path);
  } else {
    snprintf(dir, TSDB_FILENAME_LEN, "%s", path);
  }

  ret = vnodeLoadInfo(dir, &info);
  if (ret < 0) {
    vError("vgId:%d, failed to read vnode config from %s since %s", pReq->vgId, path, tstrerror(terrno));
    return -1;
  }

  SSyncCfg *pCfg = &info.config.syncCfg;
  pCfg->myIndex = pReq->selfIndex;
  pCfg->replicaNum = pReq->replica;
  memset(&pCfg->nodeInfo, 0, sizeof(pCfg->nodeInfo));

  vInfo("vgId:%d, save config, replicas:%d selfIndex:%d", pReq->vgId, pCfg->replicaNum, pCfg->myIndex);
  for (int i = 0; i < pReq->replica; ++i) {
    SNodeInfo *pNode = &pCfg->nodeInfo[i];
    pNode->nodePort = pReq->replicas[i].port;
    tstrncpy(pNode->nodeFqdn, pReq->replicas[i].fqdn, sizeof(pNode->nodeFqdn));
    vInfo("vgId:%d, save config, replica:%d ep:%s:%u", pReq->vgId, i, pNode->nodeFqdn, pNode->nodePort);
  }

  ret = vnodeSaveInfo(dir, &info);
  if (ret < 0) {
    vError("vgId:%d, failed to save vnode config since %s", pReq->vgId, tstrerror(terrno));
    return -1;
  }

  vInfo("vgId:%d, vnode config is saved", info.config.vgId);
  return 0;
}

void vnodeDestroy(const char *path, STfs *pTfs) {
  vInfo("path:%s is removed while destroy vnode", path);
  tfsRmdir(pTfs, path);
}

SVnode *vnodeOpen(const char *path, STfs *pTfs, SMsgCb msgCb) {
  SVnode    *pVnode = NULL;
  SVnodeInfo info = {0};
  char       dir[TSDB_FILENAME_LEN] = {0};
  char       tdir[TSDB_FILENAME_LEN * 2] = {0};
  int32_t    ret = 0;

  if (pTfs) {
    snprintf(dir, TSDB_FILENAME_LEN, "%s%s%s", tfsGetPrimaryPath(pTfs), TD_DIRSEP, path);
  } else {
    snprintf(dir, TSDB_FILENAME_LEN, "%s", path);
  }

  info.config = vnodeCfgDefault;

  // load vnode info
  ret = vnodeLoadInfo(dir, &info);
  if (ret < 0) {
    vError("failed to open vnode from %s since %s", path, tstrerror(terrno));
    return NULL;
  }

  // create handle
  pVnode = taosMemoryCalloc(1, sizeof(*pVnode) + strlen(path) + 1);
  if (pVnode == NULL) {
    terrno = TSDB_CODE_OUT_OF_MEMORY;
    vError("vgId:%d, failed to open vnode since %s", info.config.vgId, tstrerror(terrno));
    return NULL;
  }

  pVnode->path = (char *)&pVnode[1];
  strcpy(pVnode->path, path);
  pVnode->config = info.config;
  pVnode->state.committed = info.state.committed;
  pVnode->state.commitTerm = info.state.commitTerm;
  pVnode->state.applied = info.state.committed;
  pVnode->state.commitID = info.state.commitID;
  pVnode->state.commitTerm = info.state.commitTerm;
  pVnode->pTfs = pTfs;
  pVnode->msgCb = msgCb;
  taosThreadMutexInit(&pVnode->lock, NULL);
  pVnode->blocked = false;

  tsem_init(&pVnode->syncSem, 0, 0);
  tsem_init(&(pVnode->canCommit), 0, 1);
  taosThreadMutexInit(&pVnode->mutex, NULL);
  taosThreadCondInit(&pVnode->poolNotEmpty, NULL);

  int8_t rollback = vnodeShouldRollback(pVnode);

  // open buffer pool
  if (vnodeOpenBufPool(pVnode) < 0) {
    vError("vgId:%d, failed to open vnode buffer pool since %s", TD_VID(pVnode), tstrerror(terrno));
    goto _err;
  }

  // open meta
  if (metaOpen(pVnode, &pVnode->pMeta, rollback) < 0) {
    vError("vgId:%d, failed to open vnode meta since %s", TD_VID(pVnode), tstrerror(terrno));
    goto _err;
  }

  // open tsdb
  if (!VND_IS_RSMA(pVnode) && tsdbOpen(pVnode, &VND_TSDB(pVnode), VNODE_TSDB_DIR, NULL, rollback) < 0) {
    vError("vgId:%d, failed to open vnode tsdb since %s", TD_VID(pVnode), tstrerror(terrno));
    goto _err;
  }

  // open sma
  if (smaOpen(pVnode, rollback)) {
    vError("vgId:%d, failed to open vnode sma since %s", TD_VID(pVnode), tstrerror(terrno));
    goto _err;
  }

  // open wal
  sprintf(tdir, "%s%s%s", dir, TD_DIRSEP, VNODE_WAL_DIR);
  taosRealPath(tdir, NULL, sizeof(tdir));

  pVnode->pWal = walOpen(tdir, &(pVnode->config.walCfg));
  if (pVnode->pWal == NULL) {
    vError("vgId:%d, failed to open vnode wal since %s. wal:%s", TD_VID(pVnode), tstrerror(terrno), tdir);
    goto _err;
  }

  // open tq
  sprintf(tdir, "%s%s%s", dir, TD_DIRSEP, VNODE_TQ_DIR);
  taosRealPath(tdir, NULL, sizeof(tdir));
  pVnode->pTq = tqOpen(tdir, pVnode);
  if (pVnode->pTq == NULL) {
    vError("vgId:%d, failed to open vnode tq since %s", TD_VID(pVnode), tstrerror(terrno));
    goto _err;
  }

  // open query
  if (vnodeQueryOpen(pVnode)) {
    vError("vgId:%d, failed to open vnode query since %s", TD_VID(pVnode), tstrerror(terrno));
    terrno = TSDB_CODE_OUT_OF_MEMORY;
    goto _err;
  }

  // vnode begin
  if (vnodeBegin(pVnode) < 0) {
    vError("vgId:%d, failed to begin since %s", TD_VID(pVnode), tstrerror(terrno));
    terrno = TSDB_CODE_OUT_OF_MEMORY;
    goto _err;
  }

  // open sync
  if (vnodeSyncOpen(pVnode, dir)) {
    vError("vgId:%d, failed to open sync since %s", TD_VID(pVnode), tstrerror(terrno));
    goto _err;
  }

  if (rollback) {
    vnodeRollback(pVnode);
  }

  return pVnode;

_err:
  if (pVnode->pQuery) vnodeQueryClose(pVnode);
  if (pVnode->pTq) tqClose(pVnode->pTq);
  if (pVnode->pWal) walClose(pVnode->pWal);
  if (pVnode->pTsdb) tsdbClose(&pVnode->pTsdb);
  if (pVnode->pSma) smaClose(pVnode->pSma);
  if (pVnode->pMeta) metaClose(pVnode->pMeta);
  if (pVnode->pPool) vnodeCloseBufPool(pVnode);

  tsem_destroy(&(pVnode->canCommit));
  taosMemoryFree(pVnode);
  return NULL;
}

void vnodePreClose(SVnode *pVnode) {
  if (pVnode) {
    syncLeaderTransfer(pVnode->sync);
  }
}

void vnodeClose(SVnode *pVnode) {
  if (pVnode) {
    vnodeCommit(pVnode);
    vnodeSyncClose(pVnode);
    vnodeQueryClose(pVnode);
    walClose(pVnode->pWal);
    tqClose(pVnode->pTq);
    if (pVnode->pTsdb) tsdbClose(&pVnode->pTsdb);
    smaClose(pVnode->pSma);
    metaClose(pVnode->pMeta);
    vnodeCloseBufPool(pVnode);
    // destroy handle
    tsem_destroy(&(pVnode->canCommit));
    tsem_destroy(&pVnode->syncSem);
    taosThreadCondDestroy(&pVnode->poolNotEmpty);
    taosThreadMutexDestroy(&pVnode->mutex);
    taosThreadMutexDestroy(&pVnode->lock);
    taosMemoryFree(pVnode);
  }
}

// start the sync timer after the queue is ready
int32_t vnodeStart(SVnode *pVnode) {
  vnodeSyncStart(pVnode);
  return 0;
}

void vnodeStop(SVnode *pVnode) {}

int64_t vnodeGetSyncHandle(SVnode *pVnode) { return pVnode->sync; }

void vnodeGetSnapshot(SVnode *pVnode, SSnapshot *pSnapshot) {
  pSnapshot->data = NULL;
  pSnapshot->lastApplyIndex = pVnode->state.committed;
  pSnapshot->lastApplyTerm = pVnode->state.commitTerm;
  pSnapshot->lastConfigIndex = -1;
}
