/*
 * 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/>.
 */

#ifndef _TD_VNODE_H_
#define _TD_VNODE_H_

#include "os.h"
#include "trpc.h"

#include "meta.h"
#include "tarray.h"
#include "tq.h"
#include "tsdb.h"

#ifdef __cplusplus
extern "C" {
#endif

/* ------------------------ TYPES EXPOSED ------------------------ */
typedef struct SVnode        SVnode;
typedef struct SVnodeOptions SVnodeOptions;

/* ------------------------ SVnode ------------------------ */
/**
 * @brief Open a VNODE.
 *
 * @param path path of the vnode
 * @param pVnodeOptions options of the vnode
 * @return SVnode* The vnode object
 */
SVnode *vnodeOpen(const char *path, const SVnodeOptions *pVnodeOptions);

/**
 * @brief Close a VNODE
 *
 * @param pVnode The vnode object to close
 */
void vnodeClose(SVnode *pVnode);

/**
 * @brief Destroy a VNODE.
 *
 * @param path Path of the VNODE.
 */
void vnodeDestroy(const char *path);

/**
 * @brief Process an array of write messages.
 *
 * @param pVnode The vnode object.
 * @param pMsgs The array of SRpcMsg
 * @return int 0 for success, -1 for failure
 */
int vnodeProcessWMsgs(SVnode *pVnode, SArray *pMsgs);

/**
 * @brief Apply a write request message.
 *
 * @param pVnode The vnode object.
 * @param pMsg The request message
 * @param pRsp The response message
 * @return int 0 for success, -1 for failure
 */
int vnodeApplyWMsg(SVnode *pVnode, SRpcMsg *pMsg, SRpcMsg **pRsp);

/**
 * @brief Process the sync request
 *
 * @param pVnode
 * @param pMsg
 * @param pRsp
 * @return int
 */
int vnodeProcessSyncReq(SVnode *pVnode, SRpcMsg *pMsg, SRpcMsg **pRsp);

/* ------------------------ SVnodeOptions ------------------------ */
/**
 * @brief Initialize VNODE options.
 *
 * @param pOptions The options object to be initialized. It should not be NULL.
 */
void vnodeOptionsInit(SVnodeOptions *pOptions);

/**
 * @brief Clear VNODE options.
 *
 * @param pOptions Options to clear.
 */
void vnodeOptionsClear(SVnodeOptions *pOptions);

/* ------------------------ STRUCT DEFINITIONS ------------------------ */
struct SVnodeOptions {
  /**
   * @brief write buffer size in BYTES
   *
   */
  uint64_t wsize;

  /**
   * @brief time to live of tables in this vnode
   * in SECONDS
   *
   */
  uint32_t ttl;

  /**
   * @brief if time-series requests eventual consistency
   *
   */
  bool isWeak;

  /**
   * @brief if the allocator is heap allcator or arena allocator
   *
   */
  bool isHeapAllocator;

  /**
   * @brief TSDB options
   *
   */
  STsdbOptions tsdbOptions;

  /**
   * @brief META options
   *
   */
  SMetaOptions metaOptions;
  // STqOptions   tqOptions; // TODO
};

/* ------------------------ FOR COMPILE ------------------------ */

#if 1

#include "taosmsg.h"
#include "trpc.h"

typedef struct {
  char     db[TSDB_FULL_DB_NAME_LEN];
  int32_t  cacheBlockSize;  // MB
  int32_t  totalBlocks;
  int32_t  daysPerFile;
  int32_t  daysToKeep0;
  int32_t  daysToKeep1;
  int32_t  daysToKeep2;
  int32_t  minRowsPerFileBlock;
  int32_t  maxRowsPerFileBlock;
  int8_t   precision;  // time resolution
  int8_t   compression;
  int8_t   cacheLastRow;
  int8_t   update;
  int8_t   quorum;
  int8_t   replica;
  int8_t   selfIndex;
  int8_t   walLevel;
  int32_t  fsyncPeriod;  // millisecond
  SReplica replicas[TSDB_MAX_REPLICA];
} SVnodeCfg;

typedef enum {
  VN_MSG_TYPE_WRITE = 1,
  VN_MSG_TYPE_APPLY,
  VN_MSG_TYPE_SYNC,
  VN_MSG_TYPE_QUERY,
  VN_MSG_TYPE_FETCH
} EVnMsgType;

typedef struct {
  int32_t curNum;
  int32_t allocNum;
  SRpcMsg rpcMsg[];
} SVnodeMsg;

int32_t vnodeAlter(SVnode *pVnode, const SVnodeCfg *pCfg);
int32_t vnodeCompact(SVnode *pVnode);
int32_t vnodeSync(SVnode *pVnode);
int32_t vnodeGetLoad(SVnode *pVnode, SVnodeLoad *pLoad);

SVnodeMsg *vnodeInitMsg(int32_t msgNum);
int32_t    vnodeAppendMsg(SVnodeMsg *pMsg, SRpcMsg *pRpcMsg);
void       vnodeCleanupMsg(SVnodeMsg *pMsg);
void       vnodeProcessMsg(SVnode *pVnode, SVnodeMsg *pMsg, EVnMsgType msgType);

#endif

#ifdef __cplusplus
}
#endif

#endif /*_TD_VNODE_H_*/