#include "shm_socket.h"
#include "hashtable.h"
#include "logger_factory.h"
#include <map>
#include <cassert>
#include "bus_error.h"
#include "sole.h"
#include "shm_mm.h"
#include "key_def.h"

static Logger *logger = LoggerFactory::getLogger();

ShmQueueStMap * shmQueueStMap ;

static void print_msg(char *head, shm_packet_t &msg) {
  // err_msg(0, "%s: key=%d, type=%d\n", head, msg.key, msg.type);
}

static pthread_once_t _once_ = PTHREAD_ONCE_INIT;
static pthread_key_t _localthread_socket_key_;

static void _destrory_threadlocal_socket_(void *tmp_socket);
static void _create_threadlocal_socket_key_(void);

static int shm_recvpakfrom(shm_socket_t *sockt, shm_packet_t *recvpak ,  const struct timespec *timeout,  int flag);

   
static int shm_sendpakto(shm_socket_t *sockt,  shm_packet_t *sendpak,
               const int key, const struct timespec *timeout, const int flag);


static int _shm_sendandrecv_uuid(shm_socket_t *sockt, const void *send_buf,
                    const int send_size, const int key, void **recv_buf,
                    int *recv_size,  const struct timespec *timeout,  int flags);

static int _shm_sendandrecv_thread_local(shm_socket_t *sockt, const void *send_buf,
                    const int send_size, const int send_key, void **recv_buf,
                    int *recv_size,  const struct timespec *timeout,  int flags) ;

//  检查key是否已经被使用， 未被使用则绑定key
static LockFreeQueue<shm_packet_t> * shm_socket_bind_queue(int key, bool force) {
  hashtable_t *hashtable = mm_get_hashtable();
  LockFreeQueue<shm_packet_t> *queue;
  void *tmp_ptr = hashtable_get(hashtable, key);

  if (tmp_ptr == NULL || tmp_ptr == (void *)1  ) {
    queue = new LockFreeQueue<shm_packet_t>(32);
    hashtable_put(hashtable, key, (void *)queue);
    return queue;
  } else if(force) {
    return (LockFreeQueue<shm_packet_t> *) tmp_ptr;
  }
  
  return NULL;
}

/**
 * 绑定key到队列，但是并不会创建队列。
 */
static LockFreeQueue<shm_packet_t> * shm_socket_attach_queue(int key) {
  LockFreeQueue<shm_packet_t> * queue;
  hashtable_t *hashtable = mm_get_hashtable();
  void *tmp_ptr = hashtable_get(hashtable, key);
  if (tmp_ptr == NULL || tmp_ptr == (void *)1) {
    return NULL;
  }

  queue = ( LockFreeQueue<shm_packet_t> *)tmp_ptr;
  // hashtable_unlock(hashtable);
  return queue;
}

shm_socket_t *shm_socket_open(shm_socket_type_t socket_type) {
  int s, type;
  pthread_mutexattr_t mtxAttr;

  logger->debug("shm_socket_open\n");
  // shm_socket_t *socket = (shm_socket_t *)calloc(1, sizeof(shm_socket_t));
  shm_socket_t *sockt = new shm_socket_t;
  sockt->socket_type = socket_type;
  sockt->key = 0;
  sockt->force_bind = false;
  sockt->queue = NULL;


  s = pthread_mutexattr_init(&mtxAttr);
  if (s != 0)
    err_exit(s, "pthread_mutexattr_init");
  s = pthread_mutexattr_settype(&mtxAttr, PTHREAD_MUTEX_ERRORCHECK);
  if (s != 0)
    err_exit(s, "pthread_mutexattr_settype");
  s = pthread_mutex_init(&(sockt->mutex), &mtxAttr);
  if (s != 0)
    err_exit(s, "pthread_mutex_init");

  s = pthread_mutexattr_destroy(&mtxAttr);
  if (s != 0)
    err_exit(s, "pthread_mutexattr_destroy");


  shmQueueStMap = shm_mm_attach<ShmQueueStMap>(SHM_QUEUE_ST_KEY);

  return sockt;
}


static int _shm_socket_close_(shm_socket_t *sockt) {
  
  int rv, i;
  hashtable_t *hashtable = mm_get_hashtable();
  logger->debug("shm_socket_close\n");
 

  // if(sockt->key != 0) {
  //   auto it =  shmQueueStMap->find(sockt->key);
  //   if(it != shmQueueStMap->end()) {
  //     it->second.status = SHM_QUEUE_ST_CLOSED;
  //     it->second.closeTime = time(NULL);
  //   }
  // }



  if(sockt->queue != NULL) {
    sockt->queue->close();
    for( i = 0; i < sockt->queue->size(); i++) {
      mm_free((*(sockt->queue))[i].buf);
      logger->info("======= %d free queue element buf\n", sockt->key);
    }
    sleep(1);

    hashtable_remove(hashtable, sockt->key);
  //   sockt->queue = NULL;
  }
 
  pthread_mutex_destroy(&(sockt->mutex) );
  free(sockt);
  return 0;
}


int shm_socket_close(shm_socket_t *sockt) {

  shm_socket_t * threadlocal_socket = (shm_socket_t *)pthread_getspecific(_localthread_socket_key_);
  if(threadlocal_socket != NULL) {
    _destrory_threadlocal_socket_(threadlocal_socket);
  }
  return _shm_socket_close_(sockt);
}


int shm_socket_stop(shm_socket_t *sockt) {
  struct timespec timeout = {5, 0};
  shm_packet_t sendpak = {0};
  sendpak.key = sockt->key;
  sendpak.action = BUS_ACTION_STOP;
  sendpak.size = 0;
  return shm_sendpakto(sockt, &sendpak, sockt->key, &timeout, BUS_TIMEOUT_FLAG);
}

int shm_socket_bind(shm_socket_t *sockt, int key) {
  sockt->key = key;
  return 0;
}

int shm_socket_force_bind(shm_socket_t *sockt, int key) {
  sockt->force_bind = true;
  sockt->key = key;
  return 0;
}

int shm_socket_get_key(shm_socket_t *sockt){
  return sockt->key;
}

// 短连接方式发送
int shm_sendto(shm_socket_t *sockt, const void *buf, const int size,
               const int key, const struct timespec *timeout, const int flag) {

  int rv;
 
  shm_packet_t sendpak = {0};
  sendpak.key = sockt->key;
  sendpak.size = size;
  if(buf != NULL) {
    sendpak.buf = mm_malloc(size);
    memcpy(sendpak.buf, buf, size);
  }
 
  rv = shm_sendpakto(sockt, &sendpak, key, timeout, flag);
  return rv;
}

int shm_sendandrecv(shm_socket_t *sockt, const void *send_buf,
                    const int send_size, const int key, void **recv_buf,
                    int *recv_size,  const struct timespec *timeout,  int flags) {
  // return _shm_sendandrecv_uuid(sockt, send_buf, send_size, key, recv_buf, recv_size, timeout, flags);
  return _shm_sendandrecv_thread_local(sockt, send_buf, send_size, key, recv_buf, recv_size, timeout, flags);
} 


/**
 * @callback  void (*recvandsend_callback_fn)(void *recvbuf, int recvsize, int key, void **sendbuf, int *sendsize) 
 *            sendbuf 和 sendsize是callbak_fn回调函数的返回值, 分别表示发送数据，和发送数据的大小。
 * 
 */
int shm_recvandsend(shm_socket_t *sockt,  recvandsend_callback_fn callback, 
  const struct timespec *timeout, int flag, void *user_data) {
  
  int rv;
 
  void *sendbuf, *recvbuf = NULL;
  int sendsize = 0;
  shm_packet_t recvpak = {0};

  rv = shm_recvpakfrom(sockt , &recvpak, timeout, flag);

  if (rv != 0) {
    if(rv == ETIMEDOUT){
      logger->debug("%d shm_recvandsend failed %s", shm_socket_get_key(sockt), bus_strerror(EBUS_TIMEOUT));
      return EBUS_TIMEOUT;
    }
    
    logger->error("%d shm_recvandsend failed %s", shm_socket_get_key(sockt), bus_strerror(rv));
    return rv;
  }
   
  if(recvpak.buf != NULL) {
    recvbuf = malloc(recvpak.size);
    memcpy(recvbuf, recvpak.buf, recvpak.size);
    mm_free(recvpak.buf);
  }
 
  callback(recvbuf, recvpak.size, recvpak.key, &sendbuf, &sendsize, user_data);

  shm_packet_t sendpak = {0};
  sendpak.key = sockt->key;
  sendpak.size = sendsize;
  memcpy(sendpak.uuid, recvpak.uuid, sizeof(sendpak.uuid));
  if(sendbuf !=NULL && sendsize > 0) {
    sendpak.buf = mm_malloc(sendsize);
    memcpy(sendpak.buf, sendbuf, sendsize);
  } else {

    logger->warn("%d shm_recvandsend : sendbuf is null", shm_socket_get_key(sockt));
    // return -1;
  }
 
  rv = shm_sendpakto(sockt, &sendpak, recvpak.key, timeout, flag);

  return 0;
  
}

// 短连接方式接受
int shm_recvfrom(shm_socket_t *sockt, void **buf, int *size, int *key,  const struct timespec *timeout,  int flag) {
  int rv;
  
  shm_packet_t recvpak;
  rv = shm_recvpakfrom(sockt , &recvpak, timeout, flag);

  if (rv != 0) {

    logger->debug("%d shm_recvfrom failed %s", shm_socket_get_key(sockt), bus_strerror(rv));
    return rv;
   
  } 

  if(recvpak.buf != NULL) {
    if (buf == NULL) {
      logger->warn("!!!Alert: buf should be not NULL!\n"); 
    } else {
      void *_buf = malloc(recvpak.size);
      memcpy(_buf, recvpak.buf, recvpak.size);
      *buf = _buf; 
    }
  }
 
  if(size != NULL)
    *size = recvpak.size;

  if(key != NULL)
    *key = recvpak.key;

  if(recvpak.key == 0) {
    err_exit(0, "key = %d, pid= %d, recvpak.key == 0",  shm_socket_get_key(sockt), getpid());
  }
  mm_free(recvpak.buf);
  return 0;
}


// =================================================================================================

 /* Free thread-specific data buffer */
static void _destrory_threadlocal_socket_(void *tmp_socket)
{
  int rv;

  logger->debug("%lu destroy threadlocal socket\n", pthread_self()); 

  if(tmp_socket == NULL)
    return;
  
  _shm_socket_close_((shm_socket_t *)tmp_socket);
  rv =  pthread_setspecific(_localthread_socket_key_, NULL);
  if ( rv != 0) {
    logger->error(rv, "shm_sendandrecv : pthread_setspecific");
    exit(1);
  }
}

/* One-time key creation function */
static void _create_threadlocal_socket_key_(void)
{
  int s;

  /* Allocate a unique thread-specific data key and save the address
     of the destructor for thread-specific data buffers */
  s = pthread_key_create(&_localthread_socket_key_, _destrory_threadlocal_socket_);
  //s = pthread_key_create(&_localthread_socket_key_, NULL);
  if (s != 0) {
     logger->error(s, "pthread_key_create");
     exit(1);
  }
}


static int _shm_sendandrecv_uuid(shm_socket_t *sockt, const void *send_buf,
                    const int send_size, const int key, void **recv_buf,
                    int *recv_size,  const struct timespec *timeout,  int flags) {

  int rv, tryn = 16;
  shm_packet_t sendpak;
  shm_packet_t recvpak;
  std::map<std::string, shm_packet_t>::iterator recvbufIter;

  std::string uuid = sole::uuid4().str();
  
  sendpak.key = sockt->key;
  sendpak.size = send_size;
  if(send_buf != NULL) {
    sendpak.buf = mm_malloc(send_size);
    memcpy(sendpak.buf, send_buf, send_size);
  }
  memcpy(sendpak.uuid, uuid.c_str(), uuid.length() + 1);
  // uuid.copy(sendpak.uuid, sizeof sendpak.uuid);
  rv = shm_sendpakto(sockt, &sendpak, key, timeout, flags);

  if(rv != 0) {
    return rv;
  }

  while(tryn > 0) {
    tryn--;
    recvbufIter = sockt->recvbuf.find(uuid);
    if(recvbufIter != sockt->recvbuf.end()) {
      // 在缓存里查到了UUID匹配成功的
logger->debug("get from recvbuf: %s", uuid.c_str());
      recvpak = recvbufIter->second;
      sockt->recvbuf.erase(recvbufIter);
      goto LABLE_SUC;
    }

    rv = shm_recvpakfrom(sockt, &recvpak, timeout, flags);

    if (rv != 0) {

      if(rv == ETIMEDOUT) {
        return EBUS_TIMEOUT;
      }

      logger->debug("%d shm_recvfrom failed %s", shm_socket_get_key(sockt), bus_strerror(rv));
      return rv;
    } 

logger->debug("send uuid:%s, recv uuid: %s", uuid.c_str(), recvpak.uuid);
    if(strlen(recvpak.uuid) == 0) {
      continue;
    } else if (strncmp(uuid.c_str(), recvpak.uuid, sizeof(recvpak.uuid)) == 0) {
      // 发送与接受的UUID匹配成功
      goto LABLE_SUC;
    } else {
      // 答非所问，放到缓存里
      sockt->recvbuf.insert({recvpak.uuid, recvpak});
      continue;
    }
  }

LABLE_FAIL:
  return EBUS_RECVFROM_WRONG_END;
 
LABLE_SUC:
 if(recv_buf != NULL) {
    void *_buf = malloc(recvpak.size);
    memcpy(_buf, recvpak.buf, recvpak.size);
    *recv_buf = _buf; 
    mm_free(recvpak.buf);
  }
 
  if(recv_size != NULL)
    *recv_size = recvpak.size;

  return 0;
}

// use thread local
static int _shm_sendandrecv_thread_local(shm_socket_t *sockt, const void *send_buf,
                    const int send_size, const int key, void **recv_buf,
                    int *recv_size,  const struct timespec *timeout,  int flags) {
  
 
  int rv = 0, tryn = 16;
  static int Counter_suc = 0;
  static int Counter_fail = 0;
  shm_packet_t sendpak;
  shm_packet_t recvpak;
  std::map<int, shm_packet_t>::iterator recvbufIter;
  // 用thread local 保证每个线程用一个独占的socket接受对方返回的信息
  shm_socket_t *tmp_socket = NULL;
 
  rv = pthread_once(&_once_, _create_threadlocal_socket_key_);
  if (rv != 0) {
    logger->error(rv, "shm_sendandrecv pthread_once");
    exit(1);
  }

  tmp_socket = (shm_socket_t *)pthread_getspecific(_localthread_socket_key_);
  if (tmp_socket == NULL)
  {
    /* If first call from this thread, allocate buffer for thread, and save its location */
    tmp_socket = shm_socket_open(SHM_SOCKET_DGRAM);

    rv =  pthread_setspecific(_localthread_socket_key_, tmp_socket);
    if ( rv != 0) {
      logger->error(rv, "shm_sendandrecv : pthread_setspecific");
      exit(1);
    }
  }
 
  sendpak.key = tmp_socket->key;
  sendpak.size = send_size;
  if(send_buf != NULL) {
    sendpak.buf = mm_malloc(send_size);
    memcpy(sendpak.buf, send_buf, send_size);
  }
  rv = shm_sendpakto(tmp_socket, &sendpak, key, timeout, flags);

  if(rv != 0) {
    return rv;
  }

  while(tryn > 0) {
    tryn--;
    recvbufIter = tmp_socket->recvbuf2.find(key);
    if(recvbufIter != tmp_socket->recvbuf2.end()) {
      // 在缓存里查到了key匹配成功的
      recvpak = recvbufIter->second;
      tmp_socket->recvbuf2.erase(recvbufIter);
      goto LABLE_SUC;
    }

    rv = shm_recvpakfrom(tmp_socket, &recvpak, timeout, flags);

    if (rv != 0) {
      logger->debug("%d shm_recvfrom failed %s", shm_socket_get_key(tmp_socket), bus_strerror(rv));
      return rv;
    } 

    if (key == recvpak.key) {
      // 发送与接受的UUID匹配成功
      goto LABLE_SUC;
    } else {
      // 答非所问，放到缓存里
      tmp_socket->recvbuf2.insert({recvpak.key, recvpak});
      continue;
    }
  }

LABLE_FAIL:
  return EBUS_RECVFROM_WRONG_END;
 
LABLE_SUC:
 if(recv_buf != NULL) {
    void *_buf = malloc(recvpak.size);
    memcpy(_buf, recvpak.buf, recvpak.size);
    *recv_buf = _buf; 
    mm_free(recvpak.buf);
  }
 
  if(recv_size != NULL)
    *recv_size = recvpak.size;

  
  return 0;
}

static int _shm_sendandrecv_alloc_new(shm_socket_t *sockt, const void *send_buf,
                    const int send_size, const int send_key, void **recv_buf,
                    int *recv_size,  const struct timespec *timeout,  int flags) {
  int recv_key;
  int rv;

  int tryn = 0;
  shm_socket_t *tmp_socket;
 
 
  tmp_socket = shm_socket_open(SHM_SOCKET_DGRAM);

  if ((rv = shm_sendto(tmp_socket, send_buf, send_size, send_key, timeout, flags)) == 0) {
    rv = shm_recvfrom(tmp_socket, recv_buf, recv_size, &recv_key, timeout, flags);
   
    while(tryn < 3) {
      tryn++;
      rv = shm_recvfrom(tmp_socket, recv_buf, recv_size, &recv_key, timeout, flags);
      if(rv != 0) {
        logger->error("_shm_sendandrecv_alloc_new : %s\n", bus_strerror(rv));
        return rv;
      }
     
      // 超时导致接发送对象，与返回对象不对应的情况
      if(send_key != recv_key) {
        // logger->debug("======%d use tmp_socket %d, send to  %d, receive from  %d\n", shm_socket_get_key(sockt), shm_socket_get_key(tmp_socket), send_key, recv_key);
        // logger->error( "_shm_sendandrecv_alloc_new: send key expect to equal to recv key! send key =%d , recv key=%d", send_key, recv_key);
        
        continue;
      }
      return 0;
    }
    
    return EBUS_RECVFROM_WRONG_END;
  } 
   
  _shm_socket_close_(tmp_socket);  
  return rv;
 
}
 

   
static int shm_sendpakto(shm_socket_t *sockt,  shm_packet_t *sendpak,
               const int key, const struct timespec *timeout, const int flag) {

  int rv;
  shm_queue_status_t stRecord;
  LockFreeQueue<shm_packet_t> *remoteQueue;
  hashtable_t *hashtable = mm_get_hashtable();

  if( sockt->queue != NULL) 
    goto LABEL_PUSH;

  // if(hashtable_get_queue_count(hashtable) > QUEUE_COUNT_LIMIT) {
  //   return EBUS_EXCEED_LIMIT;
  // }
 
  {
    if ((rv = pthread_mutex_lock(&(sockt->mutex))) != 0)
    err_exit(rv, "shm_sendto : pthread_mutex_lock");
    
    if (sockt->queue == NULL) {
      if (sockt->key == 0) {
        sockt->key = hashtable_alloc_key(hashtable);
      }
      sockt->queue = shm_socket_bind_queue( sockt->key, sockt->force_bind);
      if(sockt->queue  == NULL ) {
        logger->error("%s. key = %d", bus_strerror(EBUS_KEY_INUSED), sockt->key);
        if ((rv = pthread_mutex_unlock(&(sockt->mutex))) != 0)
          err_exit(rv, "shm_sendto : pthread_mutex_unlock");
        return EBUS_KEY_INUSED;
      }

      // 标记key对应的状态 ，为opened
      stRecord.status = SHM_QUEUE_ST_OPENED;
      stRecord.createTime = time(NULL);
      shmQueueStMap->insert({sockt->key, stRecord});
      
    }

    if ((rv = pthread_mutex_unlock(&(sockt->mutex))) != 0)
      err_exit(rv, "shm_sendto : pthread_mutex_unlock");
  
  }
  
 
 LABEL_PUSH: 
  if (sendpak->action != BUS_ACTION_STOP && key == sockt->key) {
    logger->error( "can not send to your self!");
    return EBUS_SENDTO_SELF;
  }

  // 检查key标记的状态
  auto it =  shmQueueStMap->find(key);
  if(it != shmQueueStMap->end()) {
    if(it->second.status == SHM_QUEUE_ST_CLOSED) {
      // key对应的状态是关闭的
      goto ERR_CLOSED;
    }
  }

  remoteQueue = shm_socket_attach_queue(key);

  if (remoteQueue == NULL ) {
    goto ERR_CLOSED;
  } else if(remoteQueue->isClosed()) {
    goto ERR_CLOSED;
  }

  sendpak->key = sockt->key;
  rv = remoteQueue->push(*sendpak, timeout, flag);

  if(rv != 0) {
    mm_free(sendpak->buf);
  }
  if(rv == ETIMEDOUT) {
    return EBUS_TIMEOUT;
  }
  return rv;

ERR_CLOSED:
  logger->error("sendto key %d failed, %s", key, bus_strerror(EBUS_CLOSED));
  return EBUS_CLOSED;

}

// 短连接方式接受
static int shm_recvpakfrom(shm_socket_t *sockt, shm_packet_t *_recvpak ,  const struct timespec *timeout,  int flag) {
  int rv;
  shm_queue_status_t stRecord;
  hashtable_t *hashtable = mm_get_hashtable();
  shm_packet_t recvpak;

  if( sockt->queue != NULL) 
    goto LABEL_POP;

  // if(hashtable_get_queue_count(hashtable) > QUEUE_COUNT_LIMIT) {
  //   return EBUS_EXCEED_LIMIT;
  // }

  {
    if ((rv = pthread_mutex_lock(&(sockt->mutex))) != 0)
      err_exit(rv, "shm_recvfrom : pthread_mutex_lock");
 
   
    if (sockt->key == 0) {
      sockt->key = hashtable_alloc_key(hashtable);
    }  
    sockt->queue = shm_socket_bind_queue( sockt->key, sockt->force_bind);
    if(sockt->queue  == NULL ) {
      logger->error("%s. key = %d", bus_strerror(EBUS_KEY_INUSED), sockt->key);
      if ((rv = pthread_mutex_unlock(&(sockt->mutex))) != 0)
        err_exit(rv, "shm_recvfrom : pthread_mutex_unlock");
      return EBUS_KEY_INUSED;
    }
    
    // 标记key对应的状态 ，为opened
    stRecord.status = SHM_QUEUE_ST_OPENED;
    stRecord.createTime = time(NULL);
    shmQueueStMap->insert({sockt->key, stRecord});
    
    if ((rv = pthread_mutex_unlock(&(sockt->mutex))) != 0)
      err_exit(rv, "shm_recvfrom : pthread_mutex_unlock");

  }
  
LABEL_POP:

 
  rv = sockt->queue->pop(recvpak, timeout, flag);
  if(rv != 0) {
    if(rv == ETIMEDOUT) {
      return EBUS_TIMEOUT;
    }
    return rv;
  }

  
  if(recvpak.action == BUS_ACTION_STOP) {
    return EBUS_STOPED;
  }
  *_recvpak = recvpak;
  return 0;
}