/* 
 * client.c - demo program that connects to server running on SERVER_ADDRESS and PORT
 *            sends message to server, receives message from server 
 *            this program has only minor edits to the original at https://www.geeksforgeeks.org/socket-programming-cc/
 *            works with server.c
 *            first start the server running, then on a separate computer start the client running 
 *
 * usage: ./client
 * compile: gcc -o client client.c
 *
 *
 * author:  Geeks for Geeks
            Tim Pierson, Fall 2022, minor edits
 * CS 50, Fall 2022
 */

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

//get ip address from command line with:
//ip addr
// or
//wget -O - -q https://checkip.amazonaws.com
const char *SERVER_ADDRESS = "129.170.64.104";
const int PORT = 8080;


int connect_to_server(const char *server_addr) {
    int sock = 0, client_fd;
    struct sockaddr_in serv_addr;
    char* hello = "Hello from client";
    char buffer[1024] = { 0 };

    if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
        printf("\n Socket creation error \n");
        return -1;
    }
  
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_port = htons(PORT);
  
    // Convert IPv4 and IPv6 addresses from text to binary form
    if (inet_pton(AF_INET, server_addr, &serv_addr.sin_addr) <= 0) {
        printf("\nInvalid address/ Address not supported \n");
        return -1;
    }
  
    if ((client_fd = connect(sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr))) < 0) {
        printf("\nConnection Failed \n");
        return -1;
    }
    printf("Got connection\n");
    printf("Sending message %s\n",hello);
    send(sock, hello, strlen(hello), 0);
    printf("Hello message sent\n");
    printf("Waiting for reply\n");
    read(sock, buffer, 1024);
    printf("Server reply: %s\n", buffer);
  
    // closing the connected socket
    close(client_fd);
    return 0;


}

int main() {
    int ret = connect_to_server(SERVER_ADDRESS);
    if ( ret == 0) {
        printf("Had GOOD connection\n");
    }
    else {
        printf("Had BAD connection\n");
    }
}