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

#define PORT 9090
#define BUFFER_SIZE 1024

int main() {
    int server_fd, client_sock;
    struct sockaddr_in address;
    socklen_t addrlen = sizeof(address);
    char buffer[BUFFER_SIZE];

    // 1. Create socket
    server_fd = socket(AF_INET, SOCK_STREAM, 0);
    if (server_fd < 0) { perror("Socket creation failed"); exit(EXIT_FAILURE); }

    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 failed"); exit(EXIT_FAILURE); }

    printf("[Server] Listening on port %d\n", PORT);

    client_sock = accept(server_fd, (struct sockaddr*)&address, &addrlen);
    if (client_sock < 0) { perror("Accept failed"); exit(EXIT_FAILURE); }
    printf("[Server] Client connected\n");

    // 2. Set receive timeout = 5s
    struct timeval tv = {5, 0};
    setsockopt(client_sock, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));

    // 3. Attempt to receive (no client data sent yet → timeout)
    int valread = recv(client_sock, buffer, BUFFER_SIZE, 0);
    if (valread < 0) {
        if (errno == EWOULDBLOCK || errno == EAGAIN)
            printf("[Server] Receive timeout occurred\n");
        else
            perror("Recv failed");
    } else {
        buffer[valread] = '\0';
        printf("[Server] Received: %s\n", buffer);
    }

    close(client_sock);
    close(server_fd);
    return 0;
}