class Show : public ApplicationListener {
    std::vector<std::unique_ptr<ApplicationListener>> apps{};
    size_t current_app = 0;
    size_t prev_app = 0;


public:
    Show() {
        apps.push_back(std::make_unique<StartScreen>());
        apps.push_back(std::make_unique<Gradius>());
        apps.push_back(std::make_unique<GameOver>());

        prev_app = apps.size();
        current_app = 0;
    }

    void OnRender(Context &ctx) override {
        if (prev_app != current_app) {
            if (prev_app != apps.size()) {
                apps.at(prev_app)->OnDispose(ctx);
            }
            apps.at(current_app)->OnCreate(ctx);
            prev_app = current_app;
        }

        apps.at(current_app)->OnRender(ctx);

        if (IsClicked(ctx, Button::KEY_G)) {
            current_app = (current_app + 1) % apps.size();
            LogInfo("Transition to the %d", current_app);
        }
        if (IsClicked(ctx, Button::KEY_ESCAPE)) {
            ExitApp(ctx);
        }
    }

    ~Show() override {
        apps.clear();
    }
};