/*
 * 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/>.
 */

#define _DEFAULT_SOURCE
#include "dmImp.h"

static int32_t dmInitVars(SDnode *pDnode, const SDnodeOpt *pOption) {
  pDnode->data.dnodeId = 0;
  pDnode->data.clusterId = 0;
  pDnode->data.dnodeVer = 0;
  pDnode->data.updateTime = 0;
  pDnode->data.rebootTime = taosGetTimestampMs();
  pDnode->data.dropped = 0;
  pDnode->data.localEp = strdup(pOption->localEp);
  pDnode->data.localFqdn = strdup(pOption->localFqdn);
  pDnode->data.firstEp = strdup(pOption->firstEp);
  pDnode->data.secondEp = strdup(pOption->secondEp);
  pDnode->data.dataDir = strdup(pOption->dataDir);
  pDnode->data.disks = pOption->disks;
  pDnode->data.numOfDisks = pOption->numOfDisks;
  pDnode->data.supportVnodes = pOption->numOfSupportVnodes;
  pDnode->data.serverPort = pOption->serverPort;
  pDnode->ntype = pOption->ntype;

  if (pDnode->data.dataDir == NULL || pDnode->data.localEp == NULL || pDnode->data.localFqdn == NULL ||
      pDnode->data.firstEp == NULL || pDnode->data.secondEp == NULL) {
    terrno = TSDB_CODE_OUT_OF_MEMORY;
    return -1;
  }

  if (!tsMultiProcess || pDnode->ntype == DNODE || pDnode->ntype == NODE_END) {
    pDnode->data.lockfile = dmCheckRunning(pDnode->data.dataDir);
    if (pDnode->data.lockfile == NULL) {
      return -1;
    }
  }

  taosInitRWLatch(&pDnode->data.latch);
  taosThreadMutexInit(&pDnode->mutex, NULL);
  return 0;
}

static void dmClearVars(SDnode *pDnode) {
  for (EDndNodeType n = DNODE; n < NODE_END; ++n) {
    SMgmtWrapper *pMgmt = &pDnode->wrappers[n];
    taosMemoryFreeClear(pMgmt->path);
  }
  if (pDnode->data.lockfile != NULL) {
    taosUnLockFile(pDnode->data.lockfile);
    taosCloseFile(&pDnode->data.lockfile);
    pDnode->data.lockfile = NULL;
  }
  taosMemoryFreeClear(pDnode->data.localEp);
  taosMemoryFreeClear(pDnode->data.localFqdn);
  taosMemoryFreeClear(pDnode->data.firstEp);
  taosMemoryFreeClear(pDnode->data.secondEp);
  taosMemoryFreeClear(pDnode->data.dataDir);
  taosThreadMutexDestroy(&pDnode->mutex);
  memset(&pDnode->mutex, 0, sizeof(pDnode->mutex));
  taosMemoryFree(pDnode);
  dDebug("dnode memory is cleared, data:%p", pDnode);
}

SDnode *dmCreate(const SDnodeOpt *pOption) {
  dDebug("start to create dnode");
  int32_t code = -1;
  char    path[PATH_MAX] = {0};
  SDnode *pDnode = NULL;

  pDnode = taosMemoryCalloc(1, sizeof(SDnode));
  if (pDnode == NULL) {
    terrno = TSDB_CODE_OUT_OF_MEMORY;
    goto _OVER;
  }

  if (dmInitVars(pDnode, pOption) != 0) {
    dError("failed to init variables since %s", terrstr());
    goto _OVER;
  }

  dmSetStatus(pDnode, DND_STAT_INIT);
  dmSetMgmtFp(&pDnode->wrappers[DNODE]);
  mmSetMgmtFp(&pDnode->wrappers[MNODE]);
  vmSetMgmtFp(&pDnode->wrappers[VNODE]);
  qmSetMgmtFp(&pDnode->wrappers[QNODE]);
  smSetMgmtFp(&pDnode->wrappers[SNODE]);
  bmSetMgmtFp(&pDnode->wrappers[BNODE]);

  for (EDndNodeType n = DNODE; n < NODE_END; ++n) {
    SMgmtWrapper *pWrapper = &pDnode->wrappers[n];
    snprintf(path, sizeof(path), "%s%s%s", pDnode->data.dataDir, TD_DIRSEP, pWrapper->name);
    pWrapper->path = strdup(path);
    pWrapper->procShm.id = -1;
    pWrapper->pDnode = pDnode;
    pWrapper->ntype = n;
    pWrapper->procType = DND_PROC_SINGLE;
    taosInitRWLatch(&pWrapper->latch);

    if (pWrapper->path == NULL) {
      terrno = TSDB_CODE_OUT_OF_MEMORY;
      goto _OVER;
    }

    if (n != DNODE && dmReadShmFile(pWrapper) != 0) {
      dError("node:%s, failed to read shm file since %s", pWrapper->name, terrstr());
      goto _OVER;
    }
  }

  if (dmInitMsgHandle(pDnode) != 0) {
    dError("failed to init msg handles since %s", terrstr());
    goto _OVER;
  }

  pDnode->data.msgCb = dmGetMsgcb(&pDnode->wrappers[DNODE]);
  tmsgSetDefaultMsgCb(&pDnode->data.msgCb);

  dInfo("dnode is created, data:%p", pDnode);
  code = 0;

_OVER:
  if (code != 0 && pDnode) {
    dmClearVars(pDnode);
    pDnode = NULL;
    dError("failed to create dnode since %s", terrstr());
  }

  return pDnode;
}

void dmClose(SDnode *pDnode) {
  if (pDnode == NULL) return;
  dmClearVars(pDnode);
  dInfo("dnode is closed, data:%p", pDnode);
}