#include "client.h"



int main(int argc, char* argv[]){

	/* [1] Initialisation
	=========================================================*/
	/* (1) Socket information */
	// Server information
	struct hostent *server_host;
	// Server socket address
	static struct sockaddr_in server_addr;
	// Server socket address length
	socklen_t sock_len;
	// Local socket
	int sock;
	
	/* (2) Misc. information */
	// Response
	char *msg = "some message";
	// Reception buffer
	char buffer[BUFSIZE];
	// Will contain the response
	char *response;
	// Will contain the length of received/sent data
	int nb_bytes;
	


	/* [2] UPD socket creation
	=========================================================*/
	/* (1) Socket initialization */
	sock = socket(AF_INET, SOCK_DGRAM, 0);

	/* (1-) Manage error */
	if( sock == -1 ){
		perror("erreur création socket");
		exit(1);
	}

	/* (2) Get host information */
	server_host = gethostbyname("localhost");

	/* (2-) Manage error */
	if( server_host == NULL ){
		perror("erreur adresse serveur");
		exit(1);
	}

	/* (3) Create destination socket */
	bzero(&server_addr, sizeof(struct sockaddr_in)); // clean @server_addr struct before updating

	server_addr.sin_family = AF_INET;     // set server addr family (ipv4)
	server_addr.sin_port   = htons(4000); // set server port

	memcpy(    &server_addr.sin_addr.s_addr, // ) set host ipv4 addr
	   /* ( */ server_host->h_addr,          // )
	   /* ( */ server_host->h_length            );




	/* [3] Send message
	=========================================================*/
	// calculate server id struct size	
	sock_len = sizeof(struct sockaddr_in);

	/* (1) Send message to server (identified by <sockaddr_in>) */
	nb_bytes = sendto(    sock,                            // ) socket
		      /* ( */ msg,                             // ) buffer
		      /* ( */ strlen(msg) + 1,                 // ) buffer size
		      /* ( */ 0,                               // ) flags
		      /* ( */ (struct sockaddr*) &server_addr, // ) server identifier
		      /* ( */ sock_len                            ); // identifier size


	/* (2) Check if send succesfully */
	if( nb_bytes == -1 ){
		perror("erreur envoi message");
		exit(1);
	}

	// log
	printf("paquet envoyé, nb_bytes = %d\n",nb_bytes);



	/* [4] Wait for response
	=========================================================*/
	nb_bytes = recvfrom(    sock,                            // ) socket
			/* ( */ buffer,                          // ) receive buffer
			/* ( */ BUFSIZE,                         // ) buffer size
			/* ( */ 0,                               // ) flags
			/* ( */ (struct sockaddr*) &server_addr, // ) server identifier
			/* ( */ &sock_len                           ); // identifier size

	/* (2) Check if received successfully (and consistently) */
	if( nb_bytes == -1 ){
		perror("erreur réponse serveur");
		exit(1);
	}

	/* (3) Copy response into var */
	response = (char *) malloc(nb_bytes * sizeof(char));
	memcpy(response, buffer, nb_bytes);

	/* (4) log */
	printf("response recue du serveur : %s\n",response);


	/* [5] Close socket
	=========================================================*/
	close(sock);

	return 0;
}