package envoy.client.ui.controller;

import java.time.Instant;
import java.util.logging.*;

import javafx.application.Platform;
import javafx.fxml.FXML;
import javafx.geometry.Insets;
import javafx.scene.control.*;
import javafx.scene.control.Alert.AlertType;
import javafx.scene.image.ImageView;

import dev.kske.eventbus.core.*;

import envoy.data.LoginCredentials;
import envoy.event.HandshakeRejection;
import envoy.util.*;

import envoy.client.data.ClientConfig;
import envoy.client.ui.Startup;
import envoy.client.util.IconUtil;

/**
 * Controller for the login scene.
 *
 * @author Kai S. K. Engelbart
 * @author Maximilian Käfer
 * @since Envoy Client v0.1-beta
 */
public final class LoginScene {

	@FXML
	private TextField userTextField;

	@FXML
	private PasswordField passwordField;

	@FXML
	private PasswordField repeatPasswordField;

	@FXML
	private Button registerSwitch;

	@FXML
	private Label connectionLabel;

	@FXML
	private Button loginButton;

	@FXML
	private CheckBox cbStaySignedIn;

	@FXML
	private Button offlineModeButton;

	@FXML
	private Label registerTextLabel;

	@FXML
	private ImageView logo;

	private boolean registration;

	private static final Logger			logger	= EnvoyLog.getLogger(LoginScene.class);
	private static final ClientConfig	config	= ClientConfig.getInstance();

	@FXML
	private void initialize() {
		connectionLabel.setText("Server: " + config.getServer() + ":" + config.getPort());

		// Show an alert after an unsuccessful handshake
		EventBus.getInstance().registerListener(this);

		logo.setImage(IconUtil.loadIcon("envoy_logo"));

		// Set initial cursor
		userTextField.requestFocus();
	}

	@FXML
	private void loginButtonPressed() {
		final String	user			= userTextField.getText(), pass = passwordField.getText(),
			repeatPass = repeatPasswordField.getText();
		final boolean	requestToken	= cbStaySignedIn.isSelected();

		// Prevent registration with unequal passwords
		if (registration && !pass.equals(repeatPass)) {
			new Alert(AlertType.ERROR, "The entered password is unequal to the repeated one")
				.showAndWait();
			repeatPasswordField.clear();
		} else if (!Bounds.isValidContactName(user)) {
			new Alert(AlertType.ERROR,
				"The entered user name is not valid (" + Bounds.CONTACT_NAME_PATTERN + ")")
					.showAndWait();
			userTextField.clear();
		} else {
			Instant lastSync = Startup.loadLastSync(userTextField.getText());
			Startup.performHandshake(registration
				? LoginCredentials.registration(user, pass, requestToken, Startup.VERSION, lastSync)
				: LoginCredentials.login(user, pass, requestToken, Startup.VERSION, lastSync));
		}
	}

	@FXML
	private void offlineModeButtonPressed() {
		Startup.attemptOfflineMode(userTextField.getText());
	}

	@FXML
	private void registerSwitchPressed() {

		// Update button text and register switch
		if (!registration) {
			loginButton.setText("Register");
			loginButton.setPadding(new Insets(2, 116, 2, 116));
			registerTextLabel.setText("Already an account?");
			registerSwitch.setText("Login");
		} else {
			loginButton.setText("Login");
			loginButton.setPadding(new Insets(2, 125, 2, 125));
			registerTextLabel.setText("No account yet?");
			registerSwitch.setText("Register");
		}
		registration = !registration;

		// Make repeat password field and label visible / invisible
		repeatPasswordField.setVisible(registration);
		offlineModeButton.setDisable(registration);
	}

	@FXML
	private void abortLogin() {
		logger.log(Level.INFO, "The login process has been cancelled. Exiting...");
		System.exit(0);
	}

	@Event
	private void onHandshakeRejection(HandshakeRejection evt) {
		Platform.runLater(() -> new Alert(AlertType.ERROR, evt.get()).showAndWait());
	}
}