#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <netinet/tcp.h>   // For TCP_QUICKACK

#define PORT 9090
#define BUFFER_SIZE 1024

void set_quickack(int sockfd, int enable) {
    if (setsockopt(sockfd, IPPROTO_TCP, TCP_QUICKACK, &enable, sizeof(enable)) < 0) {
        perror("setsockopt TCP_QUICKACK");
    } else {
        printf("Client: TCP_QUICKACK set to %d\n", enable);
    }
}

int main() {
    int sockfd;
    struct sockaddr_in server_addr;
    char buffer[BUFFER_SIZE];

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

    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(PORT);
    server_addr.sin_addr.s_addr = inet_addr("192.168.2.1");

    if (connect(sockfd, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
        perror("Connection failed");
        close(sockfd);
        exit(EXIT_FAILURE);
    }

    // Enable quick ACKs
    set_quickack(sockfd, 1);

    char *msg = "Hello Server";
    send(sockfd, msg, strlen(msg), 0);

    int n = read(sockfd, buffer, sizeof(buffer));
    buffer[n] = '\0';
    printf("Client received: %s\n", buffer);

    // Optionally disable quick ACKs again
    set_quickack(sockfd, 0);

    close(sockfd);
    return 0;
}