// Experiment 9: TCP client-server chat application
// CLIENT side
// Compile: gcc 09_tcp_chat_client.c -o chatclient
// Run    : ./chatclient   (run AFTER chatserver)

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

#define PORT 8888
#define BUF  1024

int main() {
    int sock;
    struct sockaddr_in serv_addr;
    char buffer[BUF];

    sock = socket(AF_INET, SOCK_STREAM, 0);
    if (sock < 0) { perror("socket"); exit(1); }

    serv_addr.sin_family = AF_INET;
    serv_addr.sin_port   = htons(PORT);
    inet_pton(AF_INET, "127.0.0.1", &serv_addr.sin_addr);

    if (connect(sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr)) < 0) {
        perror("connect"); exit(1);
    }
    printf("Connected to server. Start chatting (type 'exit' to quit)\n");

    while (1) {
        // 1. Send to server
        printf("You   : ");
        memset(buffer, 0, BUF);
        if (fgets(buffer, BUF, stdin) == NULL) break;
        send(sock, buffer, strlen(buffer), 0);
        if (strncmp(buffer, "exit", 4) == 0) break;

        // 2. Receive from server
        memset(buffer, 0, BUF);
        int n = read(sock, buffer, BUF);
        if (n <= 0) { printf("Server disconnected.\n"); break; }
        printf("Server: %s", buffer);
        if (strncmp(buffer, "exit", 4) == 0) break;
    }

    close(sock);
    return 0;
}