#include "owlps-client.h"


#define DEBUG



/*
 * Opens an UDP socket to the aggregator (whose IP address is 'dest_ip'
 * and listening port is 'dest_port'). The server information is stored
 * into 'server'. The socket will send through the network interface
 * 'iface' if specified (if you want the interface to be selected,
 * automatically, this parameter should be NULL or an empty string).
 */
int owlps_create_socket_to_aggregator(char *dest_ip,
                                      uint_fast16_t dest_port,
                                      struct sockaddr_in *server,
                                      char *iface)
{
  struct sockaddr_in client ;

  int sockfd = create_udp_sending_socket(dest_ip, dest_port,
                                         server, &client) ;
  if (sockfd < 0)
    {
      perror("Error! Cannot create UDP sending socket to the aggregation"
             " server") ;
      exit(ERR_CREATING_SOCKET) ;
    }

 // If we specified an interface name
  if (iface != NULL && iface[0] != '\0')
    owlps_use_iface(sockfd, iface) ;

  return sockfd ;
}



/* Selects 'iface' as sending interface for the socket 'sockfd'. */
void owlps_use_iface(int sockfd, char *iface)
{
  if (setsockopt(sockfd, SOL_SOCKET, SO_BINDTODEVICE, iface,
                 strlen(iface) + 1) == -1)
    {
      fprintf(stderr, "Error! Cannot select interface %s to send the"
              " packet: ", iface) ;
      perror("") ;
      fprintf(stderr, "Sending through the default interface.\n") ;
    }
}



void owlps_send_request(int sockfd, struct sockaddr_in *server,
                        void *packet, uint_fast16_t packet_size,
                        uint_fast16_t nb_pkt, uint_fast32_t delay)
{
  uint_fast16_t i ;

#ifdef DEBUG
  printf("Sent packets: ") ;
#endif // DEBUG

  // Transmit first packet:
  owlps_send_packet(sockfd, server, packet, packet_size) ;

  // Transmit remaining packets (if any):
  for (i = 0 ; i < nb_pkt - 1 ; ++i)
    {
      usleep(delay) ; // Wait during the wanted delay
      owlps_send_packet(sockfd, server, packet, packet_size) ;
    }

#ifdef DEBUG
  putchar('\n') ;
#endif // DEBUG
}



void owlps_send_packet(int sockfd, struct sockaddr_in *server,
                       void *packet, uint_fast16_t packet_size)
{
  ssize_t nsent = sendto(sockfd, packet, packet_size, 0,
                         (struct sockaddr *) server,
                         (socklen_t) sizeof(*server)) ;
  if (nsent != (ssize_t) packet_size)
    {
      perror("Error sending data to the aggregation server") ;
      exit(ERR_SENDING_INFO) ;
    }

#ifdef DEBUG
  putchar('.') ;
  fflush(stdout) ;
#endif // DEBUG
}