#include "csapp.h"

int main(int argc, char **argv, char **envp) {
  char *hostname, *portno;
  struct addrinfo hints, *addrs;
  char host[256], serv[32];
  int s;
  size_t amt;

  if (argc != 4)
    app_error("need <hostname> <port> <message>");

  hostname = argv[1];
  portno = argv[2];

  memset(&hints, 0, sizeof(struct addrinfo));
  hints.ai_family = AF_INET;      /* Request IPv4 */
  hints.ai_socktype = SOCK_DGRAM; /* UDP connection */
  Getaddrinfo(hostname, portno, &hints, &addrs);

  Getnameinfo(addrs->ai_addr, addrs->ai_addrlen,
              host, sizeof(host),
              serv, sizeof(serv),
              NI_NUMERICHOST | NI_NUMERICSERV);
  printf("sending to %s:%s\n", host, serv);
      
  s = Socket(addrs->ai_family, addrs->ai_socktype, addrs->ai_protocol);
  amt = Sendto(s, argv[3], strlen(argv[3]), 0,
               addrs->ai_addr, addrs->ai_addrlen);

  long buffer;
  size_t size = Recv(s, &buffer, sizeof(buffer), 0);

  if (size != 8){
    printf("There is no hope. (Too few bytes)\n");
    return 1;
  }

  printf("%ld\n", buffer);  
  Freeaddrinfo(addrs);
  
  return (amt != strlen(argv[3]));
}