/*
 * 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 TDENGINE_CLIENTINT_H
#define TDENGINE_CLIENTINT_H

#ifdef __cplusplus
extern "C" {
#endif

#include "parser.h"
#include "query.h"
#include "taos.h"
#include "tcommon.h"
#include "tdatablock.h"
#include "tdef.h"
#include "thash.h"
#include "tlist.h"
#include "tmsg.h"
#include "tmsgtype.h"
#include "trpc.h"

#include "tconfig.h"

#define CHECK_CODE_GOTO(expr, label) \
  do {                               \
    code = expr;                     \
    if (TSDB_CODE_SUCCESS != code) { \
      goto label;                    \
    }                                \
  } while (0)

#define HEARTBEAT_INTERVAL 1500  // ms

typedef struct SAppInstInfo SAppInstInfo;

typedef struct {
  void*         param;
  SClientHbReq* req;
} SHbConnInfo;

typedef struct {
  char* key;
  // statistics
  int32_t reportCnt;
  int32_t connKeyCnt;
  int64_t reportBytes;  // not implemented
  int64_t startTime;
  // ctl
  SRWLatch lock;  // lock is used in serialization
  // connection
  SAppInstInfo* pAppInstInfo;
  // info
  SHashObj* activeInfo;  // hash<SClientHbKey, SClientHbReq>
  SHashObj* connInfo;    // hash<SClientHbKey, SHbConnInfo>
} SAppHbMgr;

typedef int32_t (*FHbRspHandle)(SAppHbMgr* pAppHbMgr, SClientHbRsp* pRsp);

typedef int32_t (*FHbReqHandle)(SClientHbKey* connKey, void* param, SClientHbReq* req);

typedef struct {
  int8_t inited;
  // ctl
  int8_t          threadStop;
  pthread_t       thread;
  pthread_mutex_t lock;       // used when app init and cleanup
  SArray*         appHbMgrs;  // SArray<SAppHbMgr*> one for each cluster
  FHbReqHandle    reqHandle[HEARTBEAT_TYPE_MAX];
  FHbRspHandle    rspHandle[HEARTBEAT_TYPE_MAX];
} SClientHbMgr;

typedef struct SQueryExecMetric {
  int64_t start;   // start timestamp
  int64_t parsed;  // start to parse
  int64_t send;    // start to send to server
  int64_t rsp;     // receive response from server
} SQueryExecMetric;

typedef struct SInstanceSummary {
  uint64_t numOfInsertsReq;
  uint64_t numOfInsertRows;
  uint64_t insertElapsedTime;
  uint64_t insertBytes;  // submit to tsdb since launched.

  uint64_t fetchBytes;
  uint64_t queryElapsedTime;
  uint64_t numOfSlowQueries;
  uint64_t totalRequests;
  uint64_t currentRequests;  // the number of SRequestObj
} SInstanceSummary;

typedef struct SHeartBeatInfo {
  void* pTimer;  // timer, used to send request msg to mnode
} SHeartBeatInfo;

struct SAppInstInfo {
  int64_t          numOfConns;
  SCorEpSet        mgmtEp;
  SInstanceSummary summary;
  SList*           pConnList;  // STscObj linked list
  int64_t          clusterId;
  void*            pTransporter;
  SAppHbMgr*       pAppHbMgr;
};

typedef struct SAppInfo {
  int64_t         startTime;
  char            appName[TSDB_APP_NAME_LEN];
  char*           ep;
  int32_t         pid;
  int32_t         numOfThreads;
  SHashObj*       pInstMap;
  pthread_mutex_t mutex;
} SAppInfo;

typedef struct STscObj {
  char            user[TSDB_USER_LEN];
  char            pass[TSDB_PASSWORD_LEN];
  char            db[TSDB_DB_FNAME_LEN];
  char            ver[128];
  int32_t         acctId;
  uint32_t        connId;
  int32_t         connType;
  uint64_t        id;         // ref ID returned by taosAddRef
  pthread_mutex_t mutex;      // used to protect the operation on db
  int32_t         numOfReqs;  // number of sqlObj bound to this connection
  SAppInstInfo*   pAppInfo;
} STscObj;

typedef struct SReqResultInfo {
  const char* pRspMsg;
  const char* pData;
  TAOS_FIELD* fields;
  uint32_t    numOfCols;
  int32_t*    length;
  TAOS_ROW    row;
  char**      pCol;
  uint32_t    numOfRows;
  uint64_t    totalRows;
  uint32_t    current;
  bool        completed;
} SReqResultInfo;

typedef struct SShowReqInfo {
  int64_t execId;  // showId/queryId
  int32_t vgId;
  SArray* pArray;        // SArray<SVgroupInfo>
  int32_t currentIndex;  // current accessed vgroup index.
} SShowReqInfo;

typedef struct SRequestSendRecvBody {
  tsem_t             rspSem;  // not used now
  void*              fp;
  SShowReqInfo       showInfo;  // todo this attribute will be removed after the query framework being completed.
  SDataBuf           requestMsg;
  int64_t            queryJob;  // query job, created according to sql query DAG.
  struct SQueryPlan* pDag;       // the query dag, generated according to the sql statement.
  SReqResultInfo     resInfo;
} SRequestSendRecvBody;

#define ERROR_MSG_BUF_DEFAULT_SIZE 512

typedef struct SRequestObj {
  uint64_t             requestId;
  int32_t              type;  // request type
  STscObj*             pTscObj;
  char*                sqlstr;  // sql string
  int32_t              sqlLen;
  int64_t              self;
  char*                msgBuf;
  void*                pInfo;  // sql parse info, generated by parser module
  int32_t              code;
  SArray*              dbList;
  SArray*              tableList;
  SQueryExecMetric     metric;
  SRequestSendRecvBody body;
} SRequestObj;

extern SAppInfo appInfo;
extern int32_t  clientReqRefPool;
extern int32_t  clientConnRefPool;

extern int (*handleRequestRspFp[TDMT_MAX])(void*, const SDataBuf* pMsg, int32_t code);
int           genericRspCallback(void* param, const SDataBuf* pMsg, int32_t code);
SMsgSendInfo* buildMsgInfoImpl(SRequestObj* pReqObj);

int taos_init();

void* createTscObj(const char* user, const char* auth, const char* db, SAppInstInfo* pAppInfo);
void  destroyTscObj(void* pObj);

uint64_t generateRequestId();

void* createRequest(STscObj* pObj, __taos_async_fn_t fp, void* param, int32_t type);
void  destroyRequest(SRequestObj* pRequest);

char* getDbOfConnection(STscObj* pObj);
void  setConnectionDB(STscObj* pTscObj, const char* db);

void taos_init_imp(void);
int  taos_options_imp(TSDB_OPTION option, const char* str);

void* openTransporter(const char* user, const char* auth, int32_t numOfThreads);

bool persistConnForSpecificMsg(void* parenct, tmsg_t msgType);
void processMsgFromServer(void* parent, SRpcMsg* pMsg, SEpSet* pEpSet);

void initMsgHandleFp();

TAOS* taos_connect_internal(const char* ip, const char* user, const char* pass, const char* auth, const char* db,
                            uint16_t port);

void* doFetchRow(SRequestObj* pRequest);

void setResultDataPtr(SReqResultInfo* pResultInfo, TAOS_FIELD* pFields, int32_t numOfCols, int32_t numOfRows);

int32_t buildRequest(STscObj* pTscObj, const char* sql, int sqlLen, SRequestObj** pRequest);

int32_t parseSql(SRequestObj* pRequest, SQuery** pQuery);

// --- heartbeat
// global, called by mgmt
int  hbMgrInit();
void hbMgrCleanUp();
int  hbHandleRsp(SClientHbBatchRsp* hbRsp);

// cluster level
SAppHbMgr* appHbMgrInit(SAppInstInfo* pAppInstInfo, char* key);
void       appHbMgrCleanup(void);

// conn level
int  hbRegisterConn(SAppHbMgr* pAppHbMgr, int32_t connId, int64_t clusterId, int32_t hbType);
void hbDeregisterConn(SAppHbMgr* pAppHbMgr, SClientHbKey connKey);

int hbAddConnInfo(SAppHbMgr* pAppHbMgr, SClientHbKey connKey, void* key, void* value, int32_t keyLen, int32_t valueLen);

// --- mq
void hbMgrInitMqHbRspHandle();

#ifdef __cplusplus
}
#endif

#endif  // TDENGINE_CLIENTINT_H