#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>

struct packet {
    char oper[5];
    int int1;
    int int2;
};

struct resultpacket {
    int success;
    int result;
};

// Driver code
int main() {
	int sockfd;
	char buffer[10];
	char *hello = "Hello from client";
	struct sockaddr_in	 servaddr;

	// Creating socket file descriptor
	if ( (sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0 ) {
		perror("socket creation failed");
		exit(EXIT_FAILURE);
	}
	printf("Socket successfully created..\n");

	memset(&servaddr, 0, sizeof(servaddr));
	// Filling server information
	servaddr.sin_family = AF_INET;
	servaddr.sin_port = htons(8080);
	servaddr.sin_addr.s_addr = INADDR_ANY;

	//variable declaration for packet to be sent
	int n, len;
	char str[5];
    char str2[5];
    int num1, num2;
    printf("Enter the string : ");
    scanf("%d %s %d", &num1, &str, &num2);

    //check operator inputted
    if (strcmp(str,"+") == 0) {
        strcpy(str2, "add");
    } else if (strcmp(str,"-") == 0) {
        strcpy(str2, "sub");
    } else if (strcmp(str,"*") == 0) {
        strcpy(str2, "mul");
    } else if (strcmp(str,"/") == 0) {
        strcpy(str2, "div");
    }

    //create packet
    struct packet pkt;
    strcpy(pkt.oper, str2);
    pkt.int1 = num1;
    pkt.int2 = num2;

    //send packet to server
	sendto(sockfd, &pkt, sizeof(pkt), MSG_CONFIRM, (const struct sockaddr *) &servaddr, sizeof(servaddr));
	printf("Sent to server: %s %d %d\n", pkt.oper, pkt.int1, pkt.int2);

	//receive response packet from server
    struct resultpacket respkt;
	n = recvfrom(sockfd, &respkt, sizeof(respkt), MSG_WAITALL, (struct sockaddr *) &servaddr, &len);
	//buffer[n] = '\0';
	printf("Received from server - success: %d / result: %d\n",respkt.success, respkt.result);

	//close socket
	close(sockfd);
	return 0;
}