#include "dmod_socket.h"


void DModSocket::foreach_subscripters(std::function<void(SHMKeySet *, SHMKeySet::iterator)>  cb) {
	SHMTopicSubMap *topic_sub_map = mem_pool_attach<SHMTopicSubMap>(BUS_MAP_KEY);
	SHMKeySet *subscripter_set;
	SHMKeySet::iterator set_iter;
	SHMTopicSubMap::iterator map_iter;

	if(topic_sub_map != NULL) {
		for (map_iter = topic_sub_map->begin(); map_iter != topic_sub_map->end(); map_iter++) {
			subscripter_set = map_iter->second;
			if(subscripter_set != NULL) {
				for(set_iter = subscripter_set->begin(); set_iter != subscripter_set->end(); set_iter++) {
					cb(subscripter_set, set_iter);
				}
			}
		}
	}
}


DModSocket::DModSocket() {
		shm_socket = shm_open_socket(SHM_SOCKET_DGRAM);
}

DModSocket::~DModSocket() {
	SHMKeySet *subscripter_set;
	SHMTopicSubMap::iterator map_iter;

	if(topic_sub_map != NULL) {
		for (map_iter = topic_sub_map->begin(); map_iter != topic_sub_map->end(); map_iter++) {
			subscripter_set = map_iter->second;
			subscripter_set->clear();
			mm_free((void *)subscripter_set);
			//delete subscripter_set;
			// printf("=============delete subscripter_set\n");
		}
		topic_sub_map->clear();
		mem_pool_free_by_key(BUS_MAP_KEY);
	}
	// printf("=============close socket\n");
	shm_close_socket(shm_socket);
}

int DModSocket::bind(int port) {
	return  shm_socket_bind(shm_socket, port);
} 



/**
 * 强制绑定端口到socket, 适用于程序非正常关闭的情况下，重启程序绑定原来还没释放的key
 * @return 0 成功， 其他值 失败的错误码
*/
int DModSocket::force_bind(int port) {
	return shm_socket_force_bind(shm_socket, port);
}
/**
 * 发送信息
 * @port 发送给谁
 * @return 0 成功， 其他值 失败的错误码
 */
int DModSocket::sendto(const void *buf, const int size, const int port) {
		return shm_sendto(shm_socket, buf, size, port, NULL, 0);
}
// 发送信息超时返回。 @sec 秒 ， @nsec 纳秒
int DModSocket::sendto_timeout(const void *buf, const int size, const int port, const struct timespec *timeout) {
	return shm_sendto(shm_socket, buf, size, port, timeout, 0);
}
// 发送信息立刻返回。
int DModSocket::sendto_nowait( const void *buf, const int size, const int port){
	return shm_sendto(shm_socket, buf, size, port, NULL, (int)SHM_MSG_NOWAIT);
}


inline int DModSocket::_recvfrom_(void **buf, int *size, int *port,  struct timespec *timeout, int flags) {

	if(mod == BUS) {
		err_exit(0, "Can not use method recvfrom in a Bus");
	}
// printf("dgram_mod_recvfrom  before\n");
	int rv = shm_recvfrom(shm_socket, buf, size, port, timeout, flags);
// printf("dgram_mod_recvfrom  after\n");
	return rv;
}
/**
 * 接收信息
 * @port 从谁哪里收到的信息
 * @return 0 成功， 其他值 失败的错误码
*/
int DModSocket::recvfrom(void **buf, int *size, int *port) {
		
		return  _recvfrom_( buf, size, port, NULL, 0);
}


// 接受信息超时返回。 @sec 秒 ， @nsec 纳秒
int DModSocket::recvfrom_timeout( void **buf, int *size, int *port, struct timespec *timeout) {
	return _recvfrom_(buf, size, port, timeout, 0);
}

int DModSocket::recvfrom_nowait( void **buf, int *size, int *port){
	return _recvfrom_(buf, size, port, NULL, (int)SHM_MSG_NOWAIT);
}

/**
 * 发送请求信息并等待接收应答
 * @port 发送给谁
 * @return 0 成功， 其他值 失败的错误码
*/
int DModSocket::sendandrecv( const void *send_buf, const int send_size, const int send_port, void **recv_buf, int *recv_size){
	return shm_sendandrecv(shm_socket, send_buf, send_size, send_port, recv_buf, recv_size, NULL, 0);
}
// 超时返回。 @sec 秒 ， @nsec 纳秒
int DModSocket::sendandrecv_timeout(const void *send_buf, const int send_size, const int send_port, void **recv_buf, int *recv_size, struct timespec *timeout){
	return shm_sendandrecv(shm_socket, send_buf, send_size, send_port, recv_buf, recv_size, timeout, 0);
}
int DModSocket::sendandrecv_nowait(const void *send_buf, const int send_size, const int send_port, void **recv_buf, int *recv_size){
	return shm_sendandrecv(shm_socket, send_buf, send_size, send_port, recv_buf, recv_size, 0, (int)SHM_MSG_NOWAIT);
}


/**
 * 启动bus
 * 
 * @return 0 成功， 其他值 失败的错误码
*/
int  DModSocket::start_bus(){
	mod = BUS;
	topic_sub_map =	mem_pool_attach<SHMTopicSubMap>(BUS_MAP_KEY);
 
	run_pubsub_proxy();
	// pthread_t tid;
	// pthread_create(&tid, NULL, run_accept_sub_request, _socket);
	return 0;
}
/**
 * @port 总线端口
 */
int  DModSocket::_sub_( void *topic, int size, int port,  
	struct timespec *timeout, int flags) {
	char buf[8192];
	snprintf(buf,  8192, "%ssub%s%s%s%s", ACTION_LIDENTIFIER, ACTION_RIDENTIFIER, TOPIC_LIDENTIFIER, (char *)topic, TOPIC_RIDENTIFIER);
	return shm_sendto(shm_socket, buf, strlen(buf) + 1, port, timeout, flags);
}
/**
 * 订阅指定主题
 * @topic 主题
 * @size 主题长度
 * @port 总线端口
 */
int  DModSocket::sub( void *topic, int size, int port){
	return _sub_( topic, size, port, NULL, 0);
}
// 超时返回。 @sec 秒 ， @nsec 纳秒
int  DModSocket::sub_timeout(void *topic, int size, int port, struct timespec *timeout){
	return _sub_(topic, size, port, timeout, 0);
}
int  DModSocket::sub_nowait(void *topic, int size, int port) {
	return _sub_(topic, size, port, NULL,  (int)SHM_MSG_NOWAIT);
}


/**
 * @port 总线端口
 */
int  DModSocket::_pub_( void *topic, int topic_size, void *content, int content_size, int port,  
	struct timespec *timeout, int flags) {
	int head_len;
	char buf[8192+content_size];
	snprintf(buf, 8192, "%spub%s%s%s%s", ACTION_LIDENTIFIER, ACTION_RIDENTIFIER, TOPIC_LIDENTIFIER, (char *)topic, TOPIC_RIDENTIFIER);
	head_len = strlen(buf);
	memcpy(buf+head_len, content, content_size);
	return shm_sendto(shm_socket, buf, head_len+content_size, port, timeout, flags);

}

/**
 * 发布主题
 * @topic 主题
 * @content 主题内容
 * @port 总线端口
 */
int  DModSocket::pub(void *topic, int topic_size, void *content, int content_size, int port){
		return _pub_(topic, topic_size, content, content_size, port, NULL, 0);
}
//  超时返回。 @sec 秒 ， @nsec 纳秒
int  DModSocket::pub_timeout(void *topic, int topic_size, void *content, int content_size, int port, struct timespec * timeout){
	return _pub_( topic, topic_size, content, content_size, port, timeout, 0);
}
int  DModSocket::pub_nowait(void *topic, int topic_size, void *content, int content_size, int port){
	return _pub_(topic, topic_size, content, content_size, port, NULL, (int)SHM_MSG_NOWAIT);
}


/**
 * 获取soket端口号
 */
int DModSocket::get_port(){
	return shm_socket->port;
}



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


/*
 * 处理订阅
*/
void DModSocket::_proxy_sub( char *topic, int port) {
	SHMKeySet *subscripter_set;

	SHMTopicSubMap::iterator map_iter;
	SHMKeySet::iterator set_iter;

	if( (map_iter = topic_sub_map->find(topic) ) != topic_sub_map->end()) {
		subscripter_set = map_iter->second;
	} else {
		void *set_ptr = mm_malloc(sizeof(SHMKeySet));
		subscripter_set = new(set_ptr) SHMKeySet;
		topic_sub_map->insert({topic, subscripter_set});
	}
	subscripter_set->insert(port);
}

/*
 * 处理发布，代理转发
*/
void DModSocket::_proxy_pub( char *topic, size_t head_len, void *buf, size_t size, int port) {
	SHMKeySet *subscripter_set;

	SHMTopicSubMap::iterator map_iter;
	SHMKeySet::iterator set_iter;

	std::vector<int> subscripter_to_del;
	std::vector<int>::iterator vector_iter;

	int send_port;
	struct timespec timeout = {1,0};

	if( (map_iter = topic_sub_map->find(topic) ) != topic_sub_map->end()) {
		subscripter_set = map_iter->second;
		for(set_iter = subscripter_set->begin(); set_iter != subscripter_set->end(); set_iter++) {
			send_port = *set_iter;
 // printf("_proxy_pub send before %d \n", send_port);
			if (shm_sendto(shm_socket, buf+head_len, size-head_len, send_port, &timeout) == SHM_SOCKET_ECONNFAILED ) {
				//对方已关闭的连接放到待删除队列里。如果直接删除会让iter指针出现错乱
				subscripter_to_del.push_back(send_port);
			} else {
// printf("_proxy_pub send after: %d \n", send_port);
			}

			
		}

		// 删除已关闭的端
		for(vector_iter = subscripter_to_del.begin(); vector_iter != subscripter_to_del.end(); vector_iter++) {
			if((set_iter = subscripter_set->find(*vector_iter)) != subscripter_set->end()) {
				subscripter_set->erase(set_iter);
				printf("remove closed subscripter %d \n", send_port);
			}
		}
		subscripter_to_del.clear();

	}
}

void * DModSocket::run_pubsub_proxy() {
	// pthread_detach(pthread_self());
	int size;
	int port;
	char * action, *topic, *topics, *buf;
	size_t head_len;

	const char *topic_delim = ",";
// printf("run_pubsub_proxy server receive before\n");
	while(shm_recvfrom(shm_socket, (void **)&buf, &size, &port) == 0) {
// printf("run_pubsub_proxy server recv after: %s \n", buf);
		if(parse_pubsub_topic(buf, size, &action, &topics, &head_len)) {
			if(strcmp(action, "sub") == 0) {
				// 订阅支持多主题订阅
				topic = trim(strtok(topics, topic_delim), NULL);
			  while(topic) {
	       _proxy_sub( topic, port);
	        topic = trim(strtok(NULL, topic_delim), NULL);
			  }

			} else if(strcmp(action, "pub") == 0) {
				_proxy_pub(topics, head_len, buf, size, port);
			}
			
			free(action);
			free(topics);
		} else {
			err_msg(0, "incorrect format msg");
		}
		free(buf);
	}
	return NULL;
}


/**
 * @str "<**sub**>{经济}"
 */

int DModSocket::parse_pubsub_topic(char *str, size_t size, char **_action, char **_topic, size_t *head_len ) {
 char *ptr = str;
 char *str_end_ptr = str + size;
 char *action_start_ptr;
 char *action_end_ptr;
 size_t action_len = 0;

 char *topic_start_ptr;
 char *topic_end_ptr;
 size_t topic_len = 0;

 // if (strlen(identifier) > strlen(str)) {
 //  return 0;
 // }

 if (strncmp(ptr, ACTION_LIDENTIFIER, strlen(ACTION_LIDENTIFIER)) == 0) {
  ptr += strlen(ACTION_LIDENTIFIER);
  action_start_ptr = ptr;
  while(strncmp(++ptr, ACTION_RIDENTIFIER, strlen(ACTION_RIDENTIFIER)) != 0) {
    if(ptr >= str_end_ptr) {
      return 0;
    }
  }
// printf("%s\n", ptr);
  action_end_ptr = ptr;
  action_len = action_end_ptr - action_start_ptr;
  ptr += strlen(ACTION_RIDENTIFIER);
// printf("%s\n", ptr);
// printf("%s\n", str_end_ptr-1);
  if(strncmp(ptr, TOPIC_LIDENTIFIER, strlen(TOPIC_LIDENTIFIER)) == 0 ) {
    topic_start_ptr = ptr+strlen(TOPIC_LIDENTIFIER);
   

    while(strncmp(++ptr, TOPIC_RIDENTIFIER, strlen(TOPIC_RIDENTIFIER)) != 0) {
      if(ptr >= str_end_ptr) {
        return 0;
      }
    }
    topic_end_ptr = ptr;
    topic_len = topic_end_ptr - topic_start_ptr;
    
    ptr += strlen(TOPIC_RIDENTIFIER);
   
  } else {
    return 0;
  }
 } else {
  return 0;
 }

 char *topic = (char *)calloc(1, topic_len+1);
 strncpy(topic, topic_start_ptr, topic_len);
 *_topic = topic;

 char *action = (char *)calloc(1, action_len+1);
 strncpy(action, action_start_ptr, action_len);
 *_action = action;
 *head_len = ptr-str;

 return 1;
}