/*
 * 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_TQ_INT_H_
#define _TD_TQ_INT_H_

#include "meta.h"
#include "tlog.h"
#include "tq.h"
#include "trpc.h"

#ifdef __cplusplus
extern "C" {
#endif

extern int32_t tqDebugFlag;

#define tqFatal(...)                                \
  {                                                 \
    if (tqDebugFlag & DEBUG_FATAL) {                \
      taosPrintLog("TQ  FATAL ", 255, __VA_ARGS__); \
    }                                               \
  }
#define tqError(...)                                \
  {                                                 \
    if (tqDebugFlag & DEBUG_ERROR) {                \
      taosPrintLog("TQ  ERROR ", 255, __VA_ARGS__); \
    }                                               \
  }
#define tqWarn(...)                                \
  {                                                \
    if (tqDebugFlag & DEBUG_WARN) {                \
      taosPrintLog("TQ  WARN ", 255, __VA_ARGS__); \
    }                                              \
  }
#define tqInfo(...)                           \
  {                                           \
    if (tqDebugFlag & DEBUG_INFO) {           \
      taosPrintLog("TQ  ", 255, __VA_ARGS__); \
    }                                         \
  }
#define tqDebug(...)                                  \
  {                                                   \
    if (tqDebugFlag & DEBUG_DEBUG) {                  \
      taosPrintLog("TQ  ", tqDebugFlag, __VA_ARGS__); \
    }                                                 \
  }
#define tqTrace(...)                                  \
  {                                                   \
    if (tqDebugFlag & DEBUG_TRACE) {                  \
      taosPrintLog("TQ  ", tqDebugFlag, __VA_ARGS__); \
    }                                                 \
  }

#define TQ_BUFFER_SIZE 8

#define TQ_BUCKET_MASK 0xFF
#define TQ_BUCKET_SIZE 256

#define TQ_PAGE_SIZE 4096
// key + offset + size
#define TQ_IDX_SIZE 24
// 4096 / 24
#define TQ_MAX_IDX_ONE_PAGE 170
// 24 * 170
#define TQ_IDX_PAGE_BODY_SIZE 4080
// 4096 - 4080
#define TQ_IDX_PAGE_HEAD_SIZE 16

#define TQ_ACTION_CONST 0
#define TQ_ACTION_INUSE 1
#define TQ_ACTION_INUSE_CONT 2
#define TQ_ACTION_INTXN 3

#define TQ_SVER 0

// TODO: inplace mode is not implemented
#define TQ_UPDATE_INPLACE 0
#define TQ_UPDATE_APPEND 1

#define TQ_DUP_INTXN_REWRITE 0
#define TQ_DUP_INTXN_REJECT 2

static inline bool tqUpdateAppend(int32_t tqConfigFlag) { return tqConfigFlag & TQ_UPDATE_APPEND; }

static inline bool tqDupIntxnReject(int32_t tqConfigFlag) { return tqConfigFlag & TQ_DUP_INTXN_REJECT; }

static const int8_t TQ_CONST_DELETE = TQ_ACTION_CONST;

#define TQ_DELETE_TOKEN (void*)&TQ_CONST_DELETE

typedef enum { TQ_ITEM_READY, TQ_ITEM_PROCESS, TQ_ITEM_EMPTY } STqItemStatus;

typedef struct {
  int16_t ver;
  int16_t action;
  int32_t checksum;
  int64_t ssize;
  char    content[];
} STqSerializedHead;

typedef int32_t (*FTqSerialize)(const void* pObj, STqSerializedHead** ppHead);
typedef int32_t (*FTqDeserialize)(void* self, const STqSerializedHead* pHead, void** ppObj);
typedef void (*FTqDelete)(void*);

typedef struct {
  int64_t key;
  int64_t offset;
  int64_t serializedSize;
  void*   valueInUse;
  void*   valueInTxn;
} STqMetaHandle;

typedef struct STqMetaList {
  STqMetaHandle       handle;
  struct STqMetaList* next;
  // struct STqMetaList* inTxnPrev;
  // struct STqMetaList* inTxnNext;
  struct STqMetaList* unpersistPrev;
  struct STqMetaList* unpersistNext;
} STqMetaList;

typedef struct {
  STQ*         pTq;
  STqMetaList* bucket[TQ_BUCKET_SIZE];
  // a table head
  STqMetaList* unpersistHead;
  // topics that are not connectted
  STqMetaList* unconnectTopic;

  // TODO:temporaral use, to be replaced by unified tfile
  int fileFd;
  // TODO:temporaral use, to be replaced by unified tfile
  int idxFd;

  char*          dirPath;
  int32_t        tqConfigFlag;
  FTqSerialize   pSerializer;
  FTqDeserialize pDeserializer;
  FTqDelete      pDeleter;
} STqMetaStore;

struct STQ {
  // the collection of groups
  // the handle of meta kvstore
  char*         path;
  STqCfg*       tqConfig;
  STqMemRef     tqMemRef;
  STqMetaStore* tqMeta;
  SWal*         pWal;
  SMeta*        pMeta;
};

typedef struct {
  int8_t inited;
  tmr_h  timer;
} STqMgmt;

static STqMgmt tqMgmt;

typedef struct {
  int8_t         status;
  int64_t        offset;
  qTaskInfo_t    task;
  STqReadHandle* pReadHandle;
} STqTaskItem;

// new version
typedef struct {
  int64_t     firstOffset;
  int64_t     lastOffset;
  STqTaskItem output[TQ_BUFFER_SIZE];
} STqBuffer;

typedef struct {
  char            topicName[TSDB_TOPIC_FNAME_LEN];
  char*           sql;
  char*           logicalPlan;
  char*           physicalPlan;
  char*           qmsg;
  int64_t         persistedOffset;
  int64_t         committedOffset;
  int64_t         currentOffset;
  STqBuffer       buffer;
  SWalReadHandle* pReadhandle;
} STqTopic;

typedef struct {
  int64_t consumerId;
  int64_t epoch;
  char    cgroup[TSDB_TOPIC_FNAME_LEN];
  SArray* topics;  // SArray<STqTopicHandle>
} STqConsumer;

int32_t tqSerializeConsumer(const STqConsumer*, STqSerializedHead**);
int32_t tqDeserializeConsumer(STQ*, const STqSerializedHead*, STqConsumer**);

static int FORCE_INLINE tqQueryExecuting(int32_t status) { return status; }

#ifdef __cplusplus
}
#endif

#endif /*_TD_TQ_INT_H_*/
