#include 
#include 
#include 
#include 
#include 

int main() {
    int server_fd, client_fd;
    struct sockaddr_in address;
    int opt = 1;
    int addrlen = sizeof(address);

    // 创建socket
    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
        perror("socket failed");
        return -1;
    }

    // 设置端口复用
    if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt))) {
        perror("setsockopt");
        return -1;
    }

    address.sin_family = AF_INET;
    address.sin_addr.s_addr = INADDR_ANY;
    address.sin_port = htons(8080);

    // 绑定
    if (bind(server_fd, (struct sockaddr *)&address, sizeof(address)) < 0) {
        perror("bind failed");
        return -1;
    }

    // 监听
    if (listen(server_fd, 3) < 0) {
        perror("listen");
        return -1;
    }

    std::cout << "Server listening on port 8080...\n";

    while (true) {
        // 接受连接
        if ((client_fd = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen)) < 0) {
            perror("accept");
            continue;
        }

        char buffer[1024] = {0};
        read(client_fd, buffer, 1024);
        
        // 简单打印请求（可选）
        // std::cout << "Request:\n" << buffer << "\n";

        // 构造HTTP响应
        const char *response =
            "HTTP/1.1 200 OK\r\n"
            "Content-Type: text/html\r\n"
            "Connection: close\r\n"
            "Content-Length: 37\r\n"
            "\r\n"
            "
Hello from C++ HTTP Server!
";

        write(client_fd, response, strlen(response));
        close(client_fd);
    }

    return 0;
}