/*
 * 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 "os.h"
#include "taosmsg.h"
#include "taoserror.h"
#include "tqueue.h"
#include "trpc.h"
#include "tutil.h"
#include "tsdb.h"
#include "twal.h"
#include "tdataformat.h"
#include "vnode.h"
#include "vnodeInt.h"
#include "vnodeLog.h"
#include "tcq.h"

static int32_t (*vnodeProcessWriteMsgFp[TSDB_MSG_TYPE_MAX])(SVnodeObj *, void *, SRspRet *);
static int32_t  vnodeProcessSubmitMsg(SVnodeObj *pVnode, void *pMsg, SRspRet *);
static int32_t  vnodeProcessCreateTableMsg(SVnodeObj *pVnode, void *pMsg, SRspRet *);
static int32_t  vnodeProcessDropTableMsg(SVnodeObj *pVnode, void *pMsg, SRspRet *);
static int32_t  vnodeProcessAlterTableMsg(SVnodeObj *pVnode, void *pMsg, SRspRet *);
static int32_t  vnodeProcessDropStableMsg(SVnodeObj *pVnode, void *pMsg, SRspRet *);

void vnodeInitWriteFp(void) {
  vnodeProcessWriteMsgFp[TSDB_MSG_TYPE_SUBMIT]          = vnodeProcessSubmitMsg;
  vnodeProcessWriteMsgFp[TSDB_MSG_TYPE_MD_CREATE_TABLE] = vnodeProcessCreateTableMsg;
  vnodeProcessWriteMsgFp[TSDB_MSG_TYPE_MD_DROP_TABLE]   = vnodeProcessDropTableMsg;
  vnodeProcessWriteMsgFp[TSDB_MSG_TYPE_MD_ALTER_TABLE]  = vnodeProcessAlterTableMsg;
  vnodeProcessWriteMsgFp[TSDB_MSG_TYPE_MD_DROP_STABLE]  = vnodeProcessDropStableMsg;
}

int32_t vnodeProcessWrite(void *param1, int qtype, void *param2, void *item) {
  int32_t    code = 0;
  SVnodeObj *pVnode = (SVnodeObj *)param1;
  SWalHead  *pHead = param2;

  if (vnodeProcessWriteMsgFp[pHead->msgType] == NULL) 
    return TSDB_CODE_MSG_NOT_PROCESSED; 

  if (pVnode->status != TAOS_VN_STATUS_READY) 
    return TSDB_CODE_NOT_ACTIVE_VNODE; 

  if (pHead->version == 0) { // from client 
    if (pVnode->status != TAOS_VN_STATUS_READY) 
      return TSDB_CODE_NOT_ACTIVE_VNODE;

    if (pVnode->syncCfg.replica > 1 && pVnode->role != TAOS_SYNC_ROLE_MASTER)
      return TSDB_CODE_NOT_READY;

    // assign version
    pVnode->version++;
    pHead->version = pVnode->version;
  } else {  
    // for data from WAL or forward, version may be smaller
    if (pHead->version <= pVnode->version) return 0;
  }
   
  // more status and role checking here

  pVnode->version = pHead->version;

  // write into WAL
  code = walWrite(pVnode->wal, pHead);
  if (code < 0) return code;

  int32_t syncCode = syncForwardToPeer(pVnode->sync, pHead, item);
  if (syncCode < 0) return syncCode;

  code = (*vnodeProcessWriteMsgFp[pHead->msgType])(pVnode, pHead->cont, item);
  if (code < 0) return code;

  return syncCode;
}

static int32_t vnodeProcessSubmitMsg(SVnodeObj *pVnode, void *pCont, SRspRet *pRet) {
  int32_t code = 0;

  // save insert result into item

  dTrace("pVnode:%p vgId:%d, submit msg is processed", pVnode, pVnode->vgId);
  code = tsdbInsertData(pVnode->tsdb, pCont);

  pRet->len = sizeof(SShellSubmitRspMsg);
  pRet->rsp = rpcMallocCont(pRet->len);
  SShellSubmitRspMsg *pRsp = pRet->rsp;

  pRsp->code              = 0;
  pRsp->numOfRows         = htonl(1);
  pRsp->affectedRows      = htonl(1);
  pRsp->numOfFailedBlocks = 0;

  return code;
}

static int32_t vnodeProcessCreateTableMsg(SVnodeObj *pVnode, void *pCont, SRspRet *pRet) {
  SMDCreateTableMsg *pTable = pCont;
  int32_t code = 0;

  dTrace("pVnode:%p vgId:%d, table:%s, start to create", pVnode, pVnode->vgId, pTable->tableId);
  int16_t   numOfColumns = htons(pTable->numOfColumns);
  int16_t   numOfTags = htons(pTable->numOfTags);
  int32_t   sid = htonl(pTable->sid);
  uint64_t  uid = htobe64(pTable->uid);
  SSchema * pSchema = (SSchema *)pTable->data;
  STSchema *pDestTagSchema = NULL;
  SDataRow  dataRow = NULL;

  int32_t totalCols = numOfColumns + numOfTags;
  
  STableCfg tCfg;
  tsdbInitTableCfg(&tCfg, pTable->tableType, uid, sid);

  STSchema *pDestSchema = tdNewSchema(numOfColumns);
  for (int i = 0; i < numOfColumns; i++) {
    tdSchemaAddCol(pDestSchema, pSchema[i].type, htons(pSchema[i].colId), htons(pSchema[i].bytes));
  }
  tsdbTableSetSchema(&tCfg, pDestSchema, false);
  tsdbTableSetName(&tCfg, pTable->tableId, false);

  if (numOfTags != 0) {
    pDestTagSchema = tdNewSchema(numOfTags);
    for (int i = numOfColumns; i < totalCols; i++) {
      tdSchemaAddCol(pDestTagSchema, pSchema[i].type, htons(pSchema[i].colId), htons(pSchema[i].bytes));
    }
    tsdbTableSetTagSchema(&tCfg, pDestTagSchema, false);
    tsdbTableSetSName(&tCfg, pTable->superTableId, false);
    tsdbTableSetSuperUid(&tCfg, htobe64(pTable->superTableUid));
    
    char *pTagData = pTable->data + totalCols * sizeof(SSchema);
    int accumBytes = 0;
    dataRow = tdNewDataRowFromSchema(pDestTagSchema);

    for (int i = 0; i < numOfTags; i++) {
      STColumn *pTCol = schemaColAt(pDestTagSchema, i);
      tdAppendColVal(dataRow, pTagData + accumBytes, pTCol->type, pTCol->bytes, pTCol->offset);
      accumBytes += htons(pSchema[i + numOfColumns].bytes);
    }
    tsdbTableSetTagValue(&tCfg, dataRow, false);
  }

  code = tsdbCreateTable(pVnode->tsdb, &tCfg);
  tdFreeDataRow(dataRow);
  tfree(pDestTagSchema);
  tfree(pDestSchema);

  dTrace("pVnode:%p vgId:%d, table:%s is created, result:%x", pVnode, pVnode->vgId, pTable->tableId, code);
  return code; 
}

static int32_t vnodeProcessDropTableMsg(SVnodeObj *pVnode, void *pCont, SRspRet *pRet) {
  SMDDropTableMsg *pTable = pCont;
  int32_t code = 0;

  dTrace("pVnode:%p vgId:%d, table:%s, start to drop", pVnode, pVnode->vgId, pTable->tableId);
  STableId tableId = {
    .uid = htobe64(pTable->uid),
    .tid = htonl(pTable->sid)
  };

  code = tsdbDropTable(pVnode->tsdb, tableId);

  return code;
}

static int32_t vnodeProcessAlterTableMsg(SVnodeObj *pVnode, void *pCont, SRspRet *pRet) {
  SMDCreateTableMsg *pTable = pCont;
  int32_t code = 0;

  dTrace("pVnode:%p vgId:%d, table:%s, start to alter", pVnode, pVnode->vgId, pTable->tableId);
  int16_t numOfColumns  = htons(pTable->numOfColumns);
  int16_t numOfTags     = htons(pTable->numOfTags);
  int32_t sid           = htonl(pTable->sid);
  uint64_t uid           = htobe64(pTable->uid);
  SSchema *pSchema = (SSchema *) pTable->data;

  int32_t totalCols = numOfColumns + numOfTags;
  
  STableCfg tCfg;
  tsdbInitTableCfg(&tCfg, pTable->tableType, uid, sid);

  STSchema *pDestSchema = tdNewSchema(numOfColumns);
  for (int i = 0; i < numOfColumns; i++) {
    tdSchemaAddCol(pDestSchema, pSchema[i].type, htons(pSchema[i].colId), htons(pSchema[i].bytes));
  }
  tsdbTableSetSchema(&tCfg, pDestSchema, false);

  if (numOfTags != 0) {
    STSchema *pDestTagSchema = tdNewSchema(numOfTags);
    for (int i = numOfColumns; i < totalCols; i++) {
      tdSchemaAddCol(pDestTagSchema, pSchema[i].type, htons(pSchema[i].colId), htons(pSchema[i].bytes));
    }
    tsdbTableSetTagSchema(&tCfg, pDestTagSchema, false);

    char *pTagData = pTable->data + totalCols * sizeof(SSchema);
    int accumBytes = 0;
    SDataRow dataRow = tdNewDataRowFromSchema(pDestTagSchema);

    for (int i = 0; i < numOfTags; i++) {
      STColumn *pTCol = schemaColAt(pDestTagSchema, i);
      tdAppendColVal(dataRow, pTagData + accumBytes, pTCol->type, pTCol->bytes, pTCol->offset);
      accumBytes += htons(pSchema[i + numOfColumns].bytes);
    }
    tsdbTableSetTagValue(&tCfg, dataRow, false);
  }

  code = tsdbAlterTable(pVnode->tsdb, &tCfg);

  tfree(pDestSchema);

  dTrace("pVnode:%p vgId:%d, table:%s, alter table result:%d", pVnode, pVnode->vgId, pTable->tableId, code);

  return code;
}

static int32_t vnodeProcessDropStableMsg(SVnodeObj *pVnode, void *pCont, SRspRet *pRet) {
  SMDDropSTableMsg *pTable = pCont;
  int32_t code = 0;

  dTrace("pVnode:%p vgId:%d, stable:%s, start to drop", pVnode, pVnode->vgId, pTable->tableId);
  // TODO: drop stable in vvnode
  //int64_t uid = htobe64(pTable->uid);
  //void *pTsdb = dnodeGetVnodeTsdb(pMsg->pVnode);
  //rpcRsp.code = tsdbDropTable(pTsdb, pTable->uid);

  code = TSDB_CODE_SUCCESS;
  dTrace("pVnode:%p vgId:%d, stable:%s, drop stable result:%x", pVnode, pTable->tableId, code);
 
  return code;
}

int vnodeWriteToQueue(void *param, void *data, int type) {
  SVnodeObj *pVnode = param;
  SWalHead *pHead = data;

  int size = sizeof(SWalHead) + pHead->len;
  SWalHead *pWal = (SWalHead *)taosAllocateQitem(size);
  memcpy(pWal, pHead, size);

  atomic_add_fetch_32(&pVnode->refCount, 1);
  taosWriteQitem(pVnode->wqueue, type, pWal);

  return 0;
}