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public class ApiClient {
    private static final String BASE_URL = "http://172.16.54.30/cgi-bin/";

    private static Retrofit retrofit;

    public static Retrofit getClient() {
        if (retrofit == null) {
            HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();
            interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);

            OkHttpClient client = new OkHttpClient.Builder()
                .addInterceptor(interceptor)
                .addInterceptor(chain -> {
                    okhttp3.Request original = chain.request();
                    String credentials = Credentials.basic("admin", "admin");
                    okhttp3.Request request = original.newBuilder()
                        .header("Authorization", credentials)
                        .method(original.method(), original.body())
                        .build();
                    return chain.proceed(request);
                })
                .build();

            retrofit = new Retrofit.Builder()
                .baseUrl(BASE_URL)
                .client(client)
                .addConverterFactory(GsonConverterFactory.create())
                .build();
        }
        return retrofit;
    }