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

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



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 _perthread_socket_key_;

static void _destrory_socket_perthread(void *tmp_socket);
static void _create_socket_key_perthread(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, const shm_packet_t *sendpak,
               const int key, const struct timespec *timeout, const int flag);

//  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;
  hashtable_lock(hashtable);
  void *tmp_ptr = hashtable_get(hashtable, key);


  if (tmp_ptr == NULL || tmp_ptr == (void *)1  ) {
    queue = new LockFreeQueue<shm_packet_t>(16);
    hashtable_put(hashtable, key, (void *)queue);
    hashtable_unlock(hashtable);
    return queue;
  } else if(force) {
    hashtable_unlock(hashtable);
    return (LockFreeQueue<shm_packet_t> *) queue;
  }
  
  hashtable_unlock(hashtable);
  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) {
    //logger->error("shm_socket._remote_queue_attach：connet at key %d  failed!", key);
    return NULL;
  }

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

//删除包含在keys内的queue
size_t shm_socket_remove_keys(int keys[], size_t length) {
  hashtable_t *hashtable = mm_get_hashtable();
  LockFreeQueue<shm_packet_t> *mqueue;
  size_t count = 0;
  for(int i = 0; i< length; i++) {
    // 销毁共享内存的queue
    mqueue = (LockFreeQueue<shm_packet_t> *)hashtable_get(hashtable, keys[i]);
    delete mqueue;
    hashtable_remove(hashtable, keys[i]);
    count++;
  }
  return count;
}

 
// 删除不在keys内的queue 
size_t shm_socket_remove_keys_exclude(int keys[], size_t length) {
  hashtable_t *hashtable = mm_get_hashtable();
  std::set<int> *keyset = hashtable_keyset(hashtable);
  std::set<int>::iterator keyItr;
  LockFreeQueue<shm_packet_t> *mqueue;
  bool found;
  size_t count = 0;
  for (keyItr = keyset->begin(); keyItr != keyset->end(); keyItr++) {
    found = false;
    for (size_t i = 0; i < length; i++) {
      if (*keyItr == keys[i]) {
        found = true;
        break;
      }
    }
    // 100内的是bus内部自己用的
    if (!found && *keyItr > 100) {
      // 销毁共享内存的queue
      mqueue = (LockFreeQueue<shm_packet_t> *)hashtable_get(hashtable, *keyItr);
      delete mqueue;
      hashtable_remove(hashtable, *keyItr);
      count++;
    }
  }
  delete keyset;
  return count;
}



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

  logger->debug("shm_open_socket\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");

  return sockt;
}

int shm_close_socket(shm_socket_t *sockt) {
  
  int rv;
  logger->debug("shm_close_socket\n");
  if(sockt->queue != NULL) {
    delete sockt->queue;
    sockt->queue = NULL;
  }

  rv =  pthread_mutex_destroy(&(sockt->mutex) );
  if(rv != 0) {
    err_exit(rv, "shm_close_socket");
  }

  free(sockt);
  return 0;
}


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) {

  int rv, tryn = 3;
  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;
  // return rv;
 
LABLE_SUC:
 if(recv_buf != NULL) {
    void *_buf = malloc(recvpak.size);
    memcpy(_buf, recvpak.buf, recvpak.size);
    *recv_buf = _buf; 
  }
 
  if(recv_size != NULL)
    *recv_size = recvpak.size;

  mm_free(recvpak.buf);

  return 0;



}

/**
 * @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) {

    if(rv == ETIMEDOUT)
      return EBUS_TIMEOUT;
    else {
      logger->debug("%d shm_recvfrom failed %s", shm_socket_get_key(sockt), bus_strerror(rv));
      return rv;
    }
   
  } 


 if(buf != NULL && recvpak.buf != NULL) {
    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;

  mm_free(recvpak.buf);
  return 0;
}


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

 /* Free thread-specific data buffer */
static void _destrory_socket_perthread(void *tmp_socket)
{
  int rv;
  if(tmp_socket == NULL)
    return;

  logger->debug("%d destroy tmp socket\n", pthread_self()); 
  shm_close_socket((shm_socket_t *)tmp_socket);
  rv =  pthread_setspecific(_perthread_socket_key_, NULL);
  if ( rv != 0) {
    logger->error(rv, "shm_sendandrecv : pthread_setspecific");
    exit(1);
  }
}

/* One-time key creation function */
static void _create_socket_key_perthread(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(&_perthread_socket_key_, _destrory_socket_perthread);
  //s = pthread_key_create(&_perthread_socket_key_, NULL);
  if (s != 0) {
     logger->error(s, "pthread_key_create");
     exit(1);
  }
}


// use thread local
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) {
  int recv_key;
  int rv;
  int tryn = 0;

  // 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;
 
  /* If first call from this thread, allocate buffer for thread, and save its location */
  // logger->debug("%d create tmp socket\n", pthread_self() );
  rv = pthread_once(&_once_, _create_socket_key_perthread);
  if (rv != 0) {
    logger->error(rv, "shm_sendandrecv pthread_once");
    exit(1);
  }

  tmp_socket = (shm_socket_t *)pthread_getspecific(_perthread_socket_key_);
  if (tmp_socket == NULL)
  {
    /* If first call from this thread, allocate buffer for thread, and save its location */
    logger->debug("%ld create tmp socket\n", (long)pthread_self() );
    tmp_socket = shm_open_socket(SHM_SOCKET_DGRAM);

    rv =  pthread_setspecific(_perthread_socket_key_, tmp_socket);
    if ( rv != 0) {
      logger->error(rv, "shm_sendandrecv : pthread_setspecific");
      exit(1);
    }
  }

  if ((rv = shm_sendto(tmp_socket, send_buf, send_size, send_key, timeout, flags)) == 0) {

    while(tryn < 3) {
      tryn++;
      rv = shm_recvfrom(tmp_socket, recv_buf, recv_size, &recv_key, timeout, flags);
      if(rv != 0) {
        logger->error("_shm_sendandrecv_thread_local : %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);
        // exit(1);
        continue;
        // return EBUS_RECVFROM_WRONG_END;
      }

      return 0;
    }
    
    return EBUS_RECVFROM_WRONG_END;
  }  

  return rv;
}

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_open_socket(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_thread_local : %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_close_socket(tmp_socket);  
  return rv;
 
}
 

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

  int rv;
  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);
        return EBUS_KEY_INUSED;
      }
    }

    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;
  }

  LockFreeQueue<shm_packet_t> *remoteQueue;
  if ((remoteQueue = shm_socket_attach_queue(key)) == NULL) {
    bus_errno = EBUS_CLOSED;
    logger->error("sendto key %d failed, %s", key, bus_strerror(bus_errno));
    return EBUS_CLOSED;
  }

  

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

  return rv;
}

// 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;
  
  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);
      return EBUS_KEY_INUSED;
    }
    
    
    if ((rv = pthread_mutex_unlock(&(sockt->mutex))) != 0)
      err_exit(rv, "shm_recvfrom : pthread_mutex_unlock");

  }
  
LABEL_POP:

 // 
  // printf("%p start recv.....\n", sockt);
 
  rv = sockt->queue->pop(recvpak, timeout, flag);
  if(rv != 0) 
    return rv;

  
  if(recvpak.action == BUS_ACTION_STOP) {
    return EBUS_STOPED;
  }
  *_recvpak = recvpak;
  return rv;
}
// int shm_sendandrecv(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) {

//   struct timespec tm = {10, 0};
//   return  _shm_sendandrecv_thread_local(sockt, send_buf, send_size, send_key,recv_buf, recv_size, &tm, flags);
// }