// tcp_client_congestion.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <netinet/tcp.h>

#define PORT 9090
#define BUF_SIZE 1024

int main() {
    int sock;
    struct sockaddr_in serv_addr;
    char buffer[BUF_SIZE] = {0};

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

    serv_addr.sin_family = AF_INET;
    serv_addr.sin_port = htons(PORT);

    if (inet_pton(AF_INET, "192.168.2.1", &serv_addr.sin_addr) <= 0) {
        perror("Invalid address");
        exit(EXIT_FAILURE);
    }

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

    // Get congestion algorithm
    char cong[16];
    socklen_t len = sizeof(cong);
    if (getsockopt(sock, IPPROTO_TCP, TCP_CONGESTION, cong, &len) == 0) {
        printf("Client using congestion algorithm: %s\n", cong);
    }

    // Send data to server
    const char *msg = "Hello Server";
    send(sock, msg, strlen(msg), 0);

    // Receive from server
    int n = recv(sock, buffer, BUF_SIZE, 0);
    if (n > 0) {
        buffer[n] = '\0';
        printf("Received from server: %s\n", buffer);
    }

    close(sock);
    return 0;
}