#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <netinet/tcp.h>
#define PORT 8080

int main() {
    int server_fd, new_socket;
    struct sockaddr_in address;
    int addrlen = sizeof(address);

    server_fd = socket(AF_INET, SOCK_STREAM, 0);
    if (server_fd < 0) {
        perror("socket failed");
        exit(EXIT_FAILURE);
    }

    int opt = 1;
    setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));

    address.sin_family = AF_INET;
    address.sin_addr.s_addr = INADDR_ANY;
    address.sin_port = htons(PORT);

    if (bind(server_fd, (struct sockaddr *)&address, sizeof(address)) < 0) {
        perror("bind failed");
        exit(EXIT_FAILURE);
    }

    if (listen(server_fd, 3) < 0) {
        perror("listen");
        exit(EXIT_FAILURE);
    }

    printf("Server listening on port %d...\n", PORT);

    if ((new_socket = accept(server_fd, (struct sockaddr *)&address,
                             (socklen_t*)&addrlen)) < 0) {
        perror("accept");
        exit(EXIT_FAILURE);
    }

    char buffer[1024] = {0};
    int valread = read(new_socket, buffer, sizeof(buffer));
    printf("Received from client: %s\n", buffer);
     int cork = 1;
    setsockopt(new_socket, IPPROTO_TCP, TCP_CORK, &cork, sizeof(cork));
    // Send parts separately (without cork, these go as separate packets)
    send(new_socket, "HELLO_", 6, 0);
   // sleep(2); // wait so Wireshark shows separate frames
    send(new_socket, "WORLD", 5, 0);

    //printf("Message sent WITHOUT TCP_CORK.\n");
    cork = 0;
    setsockopt(new_socket, IPPROTO_TCP, TCP_CORK, &cork, sizeof(cork));

    printf("Message sent WITH TCP_CORK (should be single packet).\n");
    close(new_socket);
    close(server_fd);
    return 0;
}