package envoy.client.ui.settings;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;

import javafx.event.EventHandler;
import javafx.scene.Cursor;
import javafx.scene.control.Alert;
import javafx.scene.control.Alert.AlertType;
import javafx.scene.control.TextField;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.input.InputEvent;
import javafx.scene.layout.HBox;
import javafx.stage.FileChooser;

import envoy.client.event.SendEvent;
import envoy.client.ui.IconUtil;
import envoy.client.ui.SceneContext;
import envoy.data.User;
import envoy.event.*;
import envoy.util.Bounds;

/**
 * Project: <strong>envoy-client</strong><br>
 * File: <strong>UserSettingsPane.java</strong><br>
 * Created: <strong>31.07.2020</strong><br>
 *
 * @author Leon Hofmeister
 * @since Envoy Client v0.2-beta
 */
public class UserSettingsPane extends SettingsPane {

	private boolean	profilePicChanged, usernameChanged, passwordChanged, validPassword;
	private byte[]	currentImageBytes;
	private String	newUsername, newPassword;

	/**
	 * Creates a new {@code UserSettingsPane}.
	 *
	 * @param sceneContext the {@code SceneContext} to block input to Envoy
	 * @param user         the user who wants to customize his profile
	 * @since Envoy Client v0.2-beta
	 */
	public UserSettingsPane(SceneContext sceneContext, User user) {
		super("User");

		// Display of profile pic change mechanism
		final var hbox = new HBox();
		// TODO: display current profile pic
		final var profilePic = new ImageView(IconUtil.loadIcon("envoy_logo", 50));
		profilePic.setCursor(Cursor.HAND);
		profilePic.setOnMouseClicked(e -> {
			final var pictureChooser = new FileChooser();

			pictureChooser.setTitle("Select a new picture");
			pictureChooser.setInitialDirectory(new File(System.getProperty("user.home")));
			pictureChooser.setSelectedExtensionFilter(new FileChooser.ExtensionFilter("Pictures", "*.png", "*.jpg", "*.bmp", "*.gif"));

			final var file = pictureChooser.showOpenDialog(sceneContext.getStage());

			if (file != null) {

				// Check max file size
				if (file.length() > 5E6) {
					new Alert(AlertType.WARNING, "The selected file exceeds the size limit of 5MB!").showAndWait();
					return;
				}

				try {
					currentImageBytes = Files.readAllBytes(file.toPath());
					profilePic.setImage(new Image(new ByteArrayInputStream(currentImageBytes)));
					profilePicChanged = true;
				} catch (final IOException e1) {
					e1.printStackTrace();
				}
			}
		});
		hbox.getChildren().add(profilePic);

		// Displaying the username change mechanism
		final var								username			= user.getName();
		final var								usernameTextField	= new TextField(username);
		final EventHandler<? super InputEvent>	textChanged			= e -> {
			newUsername = usernameTextField.getText();
			usernameChanged = newUsername != username;
		};
		usernameTextField.setOnInputMethodTextChanged(textChanged);
		usernameTextField.setOnKeyTyped(textChanged);
		hbox.getChildren().add(usernameTextField);
		vbox.getChildren().add(hbox);
	}

	/**
	 * Saves the given input and sends the changed input to the server
	 *
	 * @param username the new username
	 * @since Envoy Client v0.2-beta
	 */
	private void save(long userID, String oldPassword) {
		final var eventbus = EventBus.getInstance();

		// The profile pic was changed
		if (profilePicChanged) eventbus.dispatch(new SendEvent(new ProfilePicChange(currentImageBytes, userID)));

		// The username was changed
		final var validContactName = Bounds.isValidContactName(newUsername);
		if (usernameChanged && validContactName) eventbus.dispatch(new SendEvent(new NameChange(userID, newUsername)));
		else if (!validContactName) {
			final var alert = new Alert(AlertType.ERROR);
			alert.setTitle("Invalid username");
			alert.setContentText("The entered username does not conform with the naming limitations: " + Bounds.CONTACT_NAME_PATTERN);
			alert.showAndWait();
			return;
		}

		// The password was changed
		if (passwordChanged && validPassword) eventbus.dispatch(new SendEvent(new PasswordChangeRequest(newPassword, oldPassword, userID)));
		else if (!(validPassword || newPassword != null && newPassword.isBlank())) {
			final var alert = new Alert(AlertType.ERROR);
			alert.setTitle("Unequal Password");
			alert.setContentText("Repeated password is unequal to the chosen new password");
			alert.showAndWait();
			return;
		}
	}
}