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

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



static void print_msg(char *head, shm_msg_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 _tmp_recv_socket_key_;

static void *_server_run_msg_rev(void *_socket);

static void *_client_run_msg_rev(void *_socket);

static int _shm_close_dgram_socket(shm_socket_t *socket);

static int _shm_close_stream_socket(shm_socket_t *socket, bool notifyRemote);

static void _destrory_tmp_recv_socket_(void *tmp_socket);
static void _create_tmp_recv_socket_key(void);

// 检查key是否已经被使用，是返回0, 否返回1
static inline int  _shm_socket_check_key(shm_socket_t *socket) {
   void *tmp_ptr = mm_get_by_key(socket->key);
    if (tmp_ptr!= NULL && tmp_ptr != (void *)1 && !socket->force_bind ) {
      bus_errno = ESHM_BUS_KEY_INUSED;
      logger->error("%s. key = %d ", bus_strerror(bus_errno), socket->key);
      return 0;
    }
    return 1;
}

SHMQueue<shm_msg_t> *_attach_remote_queue(int key);



size_t shm_socket_remove_keys(int keys[], size_t length) {
  return SHMQueue<shm_msg_t>::remove_queues(keys,  length);
}

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));
  socket->socket_type = socket_type;
  socket->key = -1;
  socket->force_bind = false;
  socket->dispatch_thread = 0;
  socket->status = SHM_CONN_CLOSED;

  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(&(socket->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 socket;
}

int shm_close_socket(shm_socket_t *socket) {
  
  int ret, s;
  
  logger->debug("shm_close_socket\n");
  switch (socket->socket_type) {
    case SHM_SOCKET_STREAM:
      ret =  _shm_close_stream_socket(socket, true);
      break;
    case SHM_SOCKET_DGRAM:
      ret =  _shm_close_dgram_socket(socket);
      break;
    default:
      break;
  }

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

  free(socket);
  return ret;
}

// int shm_close_socket(shm_socket_t *socket) {
  
//   // _destrory_tmp_recv_socket_((shm_socket_t *)pthread_getspecific(_tmp_recv_socket_key_));
 
//   return shm_close_socket(socket);;
// }

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

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

int shm_listen(shm_socket_t *socket) {

  if (socket->socket_type != SHM_SOCKET_STREAM) {
    logger->error("can not invoke shm_listen method with a socket which is not a "
                "SHM_SOCKET_STREAM socket");
    exit(1);
  }

  int key;
  hashtable_t *hashtable = mm_get_hashtable();
  if (socket->key == -1) {
    key = hashtable_alloc_key(hashtable);
    socket->key = key;
  } else {

   if(!_shm_socket_check_key(socket)) {
     bus_errno = ESHM_BUS_KEY_INUSED;
     return ESHM_BUS_KEY_INUSED;
   }
  }

  socket->queue = new SHMQueue<shm_msg_t>(socket->key, 16);
  socket->acceptQueue = new LockFreeQueue<shm_msg_t, DM_Allocator>(16);
  socket->clientSocketMap = new std::map<int, shm_socket_t *>;
  socket->status = SHM_CONN_LISTEN;
  pthread_create(&(socket->dispatch_thread), NULL, _server_run_msg_rev,
                 (void *)socket);

  return 0;
}

/**
 * 接受客户端建立新连接的请求
 *
*/
shm_socket_t *shm_accept(shm_socket_t *socket) {
  if (socket->socket_type != SHM_SOCKET_STREAM) {
    logger->error("can not invoke shm_accept method with a socket which is not a "
                "SHM_SOCKET_STREAM socket");
    exit(1);
  }
  hashtable_t *hashtable = mm_get_hashtable();
  int client_key;
  shm_socket_t *client_socket;
  shm_msg_t src;

  if (socket->acceptQueue->pop(src) == 0) {

    // print_msg("===accept:", src);
    client_key = src.key;
    // client_socket = (shm_socket_t *)malloc(sizeof(shm_socket_t));
    client_socket = shm_open_socket(socket->socket_type);
    client_socket->key = socket->key;
    // client_socket->queue= socket->queue;
    //初始化消息queue
    client_socket->messageQueue =
        new LockFreeQueue<shm_msg_t, DM_Allocator>(16);
    //连接到对方queue
    client_socket->remoteQueue = _attach_remote_queue(client_key);

    socket->clientSocketMap->insert({client_key, client_socket});

    /*
* shm_accept 用户执行的方法
* 与_server_run_msg_rev在两个不同的限制工作,accept要保证在客户的发送消息之前完成资源的准备工作，以避免出现竞态问题
    */
    //发送open_reply,回应客户端的connect请求
    struct timespec timeout = {1, 0};
    shm_msg_t msg;
    msg.key = socket->key;
    msg.size = 0;
    msg.type = SHM_SOCKET_OPEN_REPLY;

    if (client_socket->remoteQueue->push_timeout(msg, &timeout) == 0) {
      client_socket->status = SHM_CONN_ESTABLISHED;
      return client_socket;
    } else {
      logger->error( "shm_accept: 发送open_reply失败");
      return NULL;
    }

  } else {
    err_exit(errno, "shm_accept");
  }
  return NULL;
}


/**
 * @return 0成功. 其他值失败
 */
int shm_connect(shm_socket_t *socket, int key) {
  if (socket->socket_type != SHM_SOCKET_STREAM) {
    logger->error( "can not invoke shm_connect method with a socket which is not "
                "a SHM_SOCKET_STREAM socket");
    exit(1);
  }
  hashtable_t *hashtable = mm_get_hashtable();
  if (hashtable_get(hashtable, key) == NULL) {
    logger->error("shm_connect：connect at key %d  failed!", key);
    return -1;
  }

  if (socket->key == -1) {
    socket->key = hashtable_alloc_key(hashtable);
  } else {
    if(!_shm_socket_check_key(socket)) {
      bus_errno = ESHM_BUS_KEY_INUSED;
      return ESHM_BUS_KEY_INUSED;
    }
  }

  socket->queue = new SHMQueue<shm_msg_t>(socket->key, 16);

  if ((socket->remoteQueue = _attach_remote_queue(key)) == NULL) {
    logger->error("connect to %d failted", key);
    return -1;
  }
  socket->messageQueue = new LockFreeQueue<shm_msg_t, DM_Allocator>(16);

  //发送open请求
  struct timespec timeout = {1, 0};
  shm_msg_t msg;
  msg.key = socket->key;
  msg.size = 0;
  msg.type = SHM_SOCKET_OPEN;
  socket->remoteQueue->push_timeout(msg, &timeout);

  //接受open reply
  if (socket->queue->pop(msg) == 0) {
    // 在这里server端已经准备好接受客户端发送请求了,完成与服务端的连接
    if (msg.type == SHM_SOCKET_OPEN_REPLY) {
      socket->status = SHM_CONN_ESTABLISHED;
      pthread_create(&(socket->dispatch_thread), NULL, _client_run_msg_rev,
                     (void *)socket);
    } else {
      logger->error( "shm_connect: 不匹配的应答信息!");
      exit(1);
    }

  } else {
    logger->error( "connect failted!");
    return -1;
  }

  return 0;
}

int shm_send(shm_socket_t *socket, const void *buf, const int size) {
  if (socket->socket_type != SHM_SOCKET_STREAM) {
    logger->error("shm_socket.shm_send: can not invoke shm_send method with a socket which is not a "
                "SHM_SOCKET_STREAM socket");
    exit(1);
  }
  hashtable_t *hashtable = mm_get_hashtable();
  if(socket->remoteQueue == NULL) {
  	err_msg(errno, "当前客户端无连接!");
  	return -1;
  }
  shm_msg_t dest;
  dest.type = SHM_COMMON_MSG;
  dest.key = socket->key;
  dest.size = size;
  dest.buf = mm_malloc(size);
  memcpy(dest.buf, buf, size);

  if (socket->remoteQueue->push(dest) == 0) {
    return 0;
  } else {
    logger->error(errno, "connection has been closed!");
    return -1;
  }
}

int shm_recv(shm_socket_t *socket, void **buf, int *size) {
  if (socket->socket_type != SHM_SOCKET_STREAM) {
    logger->error( "shm_socket.shm_recv: can not invoke shm_recv method in a %d type socket  which is "
                "not a SHM_SOCKET_STREAM socket ",
             socket->socket_type);
    exit(1);
  }
  shm_msg_t src;

  if (socket->messageQueue->pop(src) == 0) {
    void *_buf = malloc(src.size);
    memcpy(_buf, src.buf, src.size);
    *buf = _buf;
    *size = src.size;
    mm_free(src.buf);
    return 0;
  } else {
    return -1;
  }
}


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

  int s;
  bool rv;

  if (socket->socket_type != SHM_SOCKET_DGRAM) {
    logger->error( "shm_socket.shm_sendto: Can't invoke shm_sendto method in a %d type socket  which is "
                "not a SHM_SOCKET_DGRAM socket ",
             socket->socket_type);
    exit(0);
  }
  hashtable_t *hashtable = mm_get_hashtable();

 
  if ((s = pthread_mutex_lock(&(socket->mutex))) != 0)
    err_exit(s, "shm_sendto : pthread_mutex_lock");

  if (socket->queue == NULL) {
    if (socket->key == -1) {
      socket->key = hashtable_alloc_key(hashtable);
    } else {

     if(!_shm_socket_check_key(socket)) {
        bus_errno = ESHM_BUS_KEY_INUSED;
        return ESHM_BUS_KEY_INUSED;
     }

    }

    socket->queue = new SHMQueue<shm_msg_t>(socket->key, 16);
  }

  if ((s = pthread_mutex_unlock(&(socket->mutex))) != 0)
    err_exit(s, "shm_sendto : pthread_mutex_unlock");
  
  // if (key == socket->key) {
  //   logger->error( "can not send to your self!");
  //   return -1;
  // }

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

  shm_msg_t dest;
  dest.type = SHM_COMMON_MSG;
  dest.key = socket->key;
  dest.size = size;
  dest.buf = mm_malloc(size);
  memcpy(dest.buf, buf, size);

 
  if(flags & SHM_MSG_NOWAIT != 0) {
    rv = remoteQueue->push_nowait(dest);
  } else if(timeout != NULL) {
  	rv = remoteQueue->push_timeout(dest, timeout);
  } else {
  	rv = remoteQueue->push(dest);
  }

  if (rv == 0) {
    // printf("shm_sendto push after\n");
    delete remoteQueue;
    return 0;
  } else {
    delete remoteQueue;
    mm_free(dest.buf);
    if(rv == EBUS_TIMEOUT) {
      bus_errno = EBUS_TIMEOUT;
      logger->error(errno, "sendto key %d failed, %s", key, bus_strerror(EBUS_TIMEOUT));
      return EBUS_TIMEOUT;
    } else {
      //logger->error(errno, "sendto key %d failed!", key);
      return -1;
    }
   
   
  }
}

// 短连接方式接受
int shm_recvfrom(shm_socket_t *socket, void **buf, int *size, int *key,  struct timespec *timeout,  int flags) {
  int s;
  bool rv;

  if (socket->socket_type != SHM_SOCKET_DGRAM) {
    logger->error("shm_socket.shm_recvfrom: Can't invoke shm_recvfrom method in a %d type socket  which "
                "is not a SHM_SOCKET_DGRAM socket ",
             socket->socket_type);
    exit(1);
  }
  hashtable_t *hashtable = mm_get_hashtable();

  if ((s = pthread_mutex_lock(&(socket->mutex))) != 0)
    err_exit(s, "shm_recvfrom : pthread_mutex_lock");
 
  if (socket->queue == NULL) {
    if (socket->key == -1) {
      socket->key = hashtable_alloc_key(hashtable);
    } else {

      if(!_shm_socket_check_key(socket)) {
        bus_errno = ESHM_BUS_KEY_INUSED;
        return ESHM_BUS_KEY_INUSED;
      }
    }

    socket->queue = new SHMQueue<shm_msg_t>(socket->key, 16);
  }
  
  if ((s = pthread_mutex_unlock(&(socket->mutex))) != 0)
    err_exit(s, "shm_recvfrom : pthread_mutex_unlock");

  shm_msg_t src;
 
   if(flags & SHM_MSG_NOWAIT != 0) {
    rv = socket->queue->pop_nowait(src);
  } else if(timeout != NULL) {
    rv = socket->queue->pop_timeout(src, timeout);
  } else {
    rv = socket->queue->pop(src);
  }

  if (rv == 0) {
    if(buf != NULL) {
      void *_buf = malloc(src.size);
      memcpy(_buf, src.buf, src.size);
      *buf = _buf; 
    }
   
    if(size != NULL)
      *size = src.size;

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

    mm_free(src.buf);
    return 0;
  } else {
    return -1;
  }
}


 /* Free thread-specific data buffer */
static void _destrory_tmp_recv_socket_(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(_tmp_recv_socket_key_, NULL);
  if ( rv != 0) {
    logger->error(rv, "shm_sendandrecv : pthread_setspecific");
    exit(1);
  }
}

/* One-time key creation function */
static void _create_tmp_recv_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(&_tmp_recv_socket_key_, _destrory_tmp_recv_socket_);
  //s = pthread_key_create(&_tmp_recv_socket_key_, NULL);
  if (s != 0) {
     logger->error(s, "pthread_key_create");
     abort(); /* dump core and terminate */ 
     exit(1);
  }
}


// use thread local
int _shm_sendandrecv_thread_local(shm_socket_t *socket, const void *send_buf,
                    const int send_size, const int send_key, void **recv_buf,
                    int *recv_size,  struct timespec *timeout,  int flags) {
  int recv_key;
  int rv;

  // 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 (socket->socket_type != SHM_SOCKET_DGRAM) {
    logger->error( "shm_socket.shm_sendandrecv: Can't invoke shm_sendandrecv method in a %d type socket  "
                "which is not a SHM_SOCKET_DGRAM socket ",
             socket->socket_type);
    exit(1);
  }
 

  rv = pthread_once(&_once_, _create_tmp_recv_socket_key);
  if (rv != 0) {
    logger->error(rv, "shm_sendandrecv pthread_once");
    exit(1);
  }

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

    rv =  pthread_setspecific(_tmp_recv_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) {
    rv = shm_recvfrom(tmp_socket, recv_buf, recv_size, &recv_key, timeout, flags);
    
    return rv;
  } else {
     
    return rv;
  }
  return -1;
}

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

  // 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 (socket->socket_type != SHM_SOCKET_DGRAM) {
    logger->error( "shm_socket.shm_sendandrecv: Can't invoke shm_sendandrecv method in a %d type socket  "
                "which is not a SHM_SOCKET_DGRAM socket ",
             socket->socket_type);
    exit(1);
  }
 
  /* If first call from this thread, allocate buffer for thread, and save its location */
  // logger->debug("%d create tmp socket\n", pthread_self() );
  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);
  } 
   
  shm_close_socket(tmp_socket);  
  return rv;
 
}

int shm_sendandrecv_unsafe(shm_socket_t *socket, const void *send_buf,
                    const int send_size, const int send_key, void **recv_buf,
                    int *recv_size,  struct timespec *timeout,  int flags) {
  if (socket->socket_type != SHM_SOCKET_DGRAM) {
    logger->error( "shm_socket.shm_sendandrecv_unsafe : Can't invoke shm_sendandrecv method in a %d type socket  "
                "which is not a SHM_SOCKET_DGRAM socket ",
             socket->socket_type);
    exit(1);
  }
  int recv_key;
  int rv;

 
  if ((rv = shm_sendto(socket, send_buf, send_size, send_key, timeout, flags)) == 0) {
    rv = shm_recvfrom(socket, recv_buf, recv_size, &recv_key, timeout, flags);
    return rv;
  } else {
    return rv;
  }
  return -1;
}

int shm_sendandrecv(shm_socket_t *socket, const void *send_buf,
                    const int send_size, const int send_key, void **recv_buf,
                    int *recv_size,  struct timespec *timeout,  int flags) {
  return  _shm_sendandrecv_thread_local(socket, send_buf, send_size, send_key,recv_buf, recv_size, timeout,  flags);
}


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

/**
 * 绑定key到队列，但是并不会创建队列。如果没有对应指定key的队列提示错误并退出
 */
SHMQueue<shm_msg_t> *_attach_remote_queue(int key) {

  hashtable_t *hashtable = mm_get_hashtable();
  if (hashtable_get(hashtable, key) == NULL) {
    //logger->error("shm_socket._remote_queue_attach：connet at key %d  failed!", key);
    return NULL;
  }

  SHMQueue<shm_msg_t> *queue = new SHMQueue<shm_msg_t>(key, 0);
  return queue;
}

void _server_close_conn_to_client(shm_socket_t *socket, int key) {
  shm_socket_t *client_socket;
  std::map<int, shm_socket_t *>::iterator iter =
      socket->clientSocketMap->find(key);
  if (iter != socket->clientSocketMap->end()) {
    client_socket = iter->second;
    free((void *)client_socket);
    socket->clientSocketMap->erase(iter);
  }
}

/**
 * server端各种类型消息（）在这里进程分拣
 */
void *_server_run_msg_rev(void *_socket) {
  pthread_detach(pthread_self());
  shm_socket_t *socket = (shm_socket_t *)_socket;
  struct timespec timeout = {1, 0};
  shm_msg_t src;
  shm_socket_t *client_socket;
  std::map<int, shm_socket_t *>::iterator iter;

  while (socket->queue->pop(src) == 0) {

    switch (src.type) {
    case SHM_SOCKET_OPEN:
      socket->acceptQueue->push_timeout(src, &timeout);
      break;
    case SHM_SOCKET_CLOSE:
      _server_close_conn_to_client(socket, src.key);
      break;
    case SHM_COMMON_MSG:

      iter = socket->clientSocketMap->find(src.key);
      if (iter != socket->clientSocketMap->end()) {
        client_socket = iter->second;
        // print_msg("_server_run_msg_rev push before", src);
        client_socket->messageQueue->push_timeout(src, &timeout);
        // print_msg("_server_run_msg_rev push after", src);
      }

      break;

    default:
       logger->error("shm_socket._server_run_msg_rev: undefined message type.");
    }
  }

  return NULL;
}

void _client_close_conn_to_server(shm_socket_t *socket) {

  _shm_close_stream_socket(socket, false);
}

/**
 * client端的各种类型消息（）在这里进程分拣
 */
void *_client_run_msg_rev(void *_socket) {
  pthread_detach(pthread_self());
  shm_socket_t *socket = (shm_socket_t *)_socket;
  struct timespec timeout = {1, 0};
  shm_msg_t src;

  while (socket->queue->pop(src) == 0) {
    switch (src.type) {

    case SHM_SOCKET_CLOSE:
      _client_close_conn_to_server(socket);
      break;
    case SHM_COMMON_MSG:
      socket->messageQueue->push_timeout(src, &timeout);
      break;
    default:
       logger->error( "shm_socket._client_run_msg_rev: undefined message type.");
    }
  }

  return NULL;
}

int _shm_close_stream_socket(shm_socket_t *socket, bool notifyRemote) {
  socket->status = SHM_CONN_CLOSED;
  //给对方发送一个关闭连接的消息
  struct timespec timeout = {1, 0};
  shm_msg_t close_msg;

  close_msg.key = socket->key;
  close_msg.size = 0;
  close_msg.type = SHM_SOCKET_CLOSE;
  if (notifyRemote && socket->remoteQueue != NULL) {
    socket->remoteQueue->push_timeout(close_msg, &timeout);
  }

  if (socket->queue != NULL) {
    delete socket->queue;
    socket->queue = NULL;
  }

  if (socket->remoteQueue != NULL) {
    delete socket->remoteQueue;
    socket->remoteQueue = NULL;
  }

  if (socket->messageQueue != NULL) {
    delete socket->messageQueue;
    socket->messageQueue = NULL;
  }

  if (socket->acceptQueue != NULL) {
    delete socket->acceptQueue;
    socket->acceptQueue = NULL;
  }

  if (socket->clientSocketMap != NULL) {
    shm_socket_t *client_socket;
    for (auto iter = socket->clientSocketMap->begin();
         iter != socket->clientSocketMap->end(); iter++) {
      client_socket = iter->second;

      client_socket->remoteQueue->push_timeout(close_msg, &timeout);
      delete client_socket->remoteQueue;
      client_socket->remoteQueue = NULL;

      delete client_socket->messageQueue;
      client_socket->messageQueue = NULL;
      free((void *)client_socket);
    }
    delete socket->clientSocketMap;
  }

  if (socket->dispatch_thread != 0)
    pthread_cancel(socket->dispatch_thread);

  
  return 0;

}

int _shm_close_dgram_socket(shm_socket_t *socket){
	if(socket->queue != NULL) {
		delete socket->queue;
		socket->queue = NULL;
	}
	
	return 0;
}