public class LoginPresenter
        implements Bundleable, LoginService.Listener, RegisterService.Listener, LoadingManager.Listener {
    private static final String TAG = "LoginPresenter";

    @Inject
    LoginService loginService;

    @Inject
    RegisterService registerService;

    @Inject
    SessionManager sessionManager;

    @Inject
    ProfileManager profileManager;

    @Inject
    LoadingManager loadingManager;

    @Inject
    public LoginPresenter() {
    }

    public interface ViewContract {
        void setLoginEnabled(boolean enabled);

        void setRegisterEnabled(boolean enabled);

        void navigateToMain();

        void showLoading();

        void hideLoading();
    }

    ViewContract view;

    private boolean hasView() {
        return view != null;
    }

    public void bindView(ViewContract view) {
        this.view = view;
        SingletonBus.INSTANCE.register(this);
        evaluateButtonStatus();
        loadingManager.triggerLoading();
    }

    public void unbindView() {
        SingletonBus.INSTANCE.unregister(this);
        this.view = null;
    }

    private String username;
    private String password;
    private String alias;

    public void login() {
        sessionManager.updateUser(username, password, alias);
        loginService.loginUser();
        loadingManager.showLoading();
    }

    public void register() {
        sessionManager.updateUser(username, password, alias);
        registerService.registerUser(new Registration(username, alias, password));
        loadingManager.showLoading();
    }

    @Override
    public void onEventMainThread(LoadingManager.LoadingEvent e) {
        if(e.isLoading()) {
            view.showLoading();
        } else {
            view.hideLoading();
        }
    }

    public void notifyUsernameChanged(String newUsername) {
        this.username = newUsername;
        evaluateButtonStatus();
    }

    public void notifyPasswordChanged(String newPassword) {
        this.password = newPassword;
        evaluateButtonStatus();
    }

    public void notifyAliasChanged(String newAlias) {
        this.alias = newAlias;
        evaluateButtonStatus();
    }

    private void evaluateButtonStatus() {
        if(hasView()) {
            view.setLoginEnabled(isLoginEnabled());
            view.setRegisterEnabled(isRegisterEnabled());
        }
    }

    private boolean isLoginEnabled() {
        return !StringUtils.isEmpty(username) && !StringUtils.isEmpty(password);
    }

    private boolean isRegisterEnabled() {
        return isLoginEnabled() && !StringUtils.isEmpty(alias);
    }

    @Override
    public void onEventMainThread(LoginService.SuccessEvent e) {
        loadingManager.hideLoading();
        profileManager.setProfile(e.getResult());
        view.navigateToMain();
    }

    @Override
    public void onEventMainThread(RegisterService.SuccessEvent e) {
        loadingManager.hideLoading();
        profileManager.setProfile(e.getResult());
        view.navigateToMain();
    }

    @Override
    public void onEventMainThread(RetrofitErrorHandler.ErrorEvent e) {
        loadingManager.hideLoading();
        if(e.hasResult()) {
            Toaster.makeLongToast(e.getResult().getMessage());
        } else {
            Toaster.makeShortToast(ResourceUtils.getString(R.string.an_error_occurred));
        }
    }

    @Override
    public void onEventMainThread(RetrofitErrorHandler.FailureEvent e) {
        loadingManager.hideLoading();
        Toaster.makeShortToast(ResourceUtils.getString(R.string.an_error_occurred));
    }

    @Override
    public Bundle toBundle() {
        Bundle bundle = new Bundle();
        bundle.putString("username", username);
        bundle.putString("password", password);
        bundle.putString("alias", alias);
        return bundle;
    }

    @Override
    public void fromBundle(@Nullable Bundle bundle) {
        if(bundle != null) {
            username = bundle.getString("username");
            password = bundle.getString("password");
            alias = bundle.getString("alias");
        }
    }
}