package envoy.client.util;

import java.util.logging.*;

import javafx.scene.control.Alert;
import javafx.scene.control.Alert.AlertType;

import envoy.client.data.Context;
import envoy.client.event.*;
import envoy.client.helper.*;
import envoy.client.ui.SceneContext.SceneInfo;
import envoy.client.ui.controller.ChatScene;
import envoy.data.*;
import envoy.data.User.UserStatus;
import envoy.event.*;
import envoy.event.contact.UserOperation;
import envoy.util.EnvoyLog;

import dev.kske.eventbus.EventBus;

/**
 * Contains methods that change something about the currently logged in user.
 *
 * @author Leon Hofmeister
 * @since Envoy Client v0.3-beta
 */
public final class UserUtil {

	private static final Context	context	= Context.getInstance();
	private static final Logger		logger	= EnvoyLog.getLogger(UserUtil.class);

	private UserUtil() {}

	/**
	 * Logs the current user out and reopens
	 * {@link envoy.client.ui.controller.LoginScene}.
	 *
	 * @since Envoy Client v0.2-beta
	 */
	public static void logout() {
		final var alert = new Alert(AlertType.CONFIRMATION);
		alert.setTitle("Logout?");
		alert.setContentText("Are you sure you want to log out?");

		AlertHelper.confirmAction(alert, () -> {
			EnvoyLog.getLogger(ShutdownHelper.class).log(Level.INFO, "A logout was requested");
			EventBus.getInstance().dispatch(new EnvoyCloseEvent());
			EventBus.getInstance().dispatch(new Logout());
			context.getSceneContext().load(SceneInfo.LOGIN_SCENE);
			logger.log(Level.INFO, "A logout occurred.");
		});
	}

	/**
	 * Notifies the application that the status of the currently logged in user has
	 * changed.
	 *
	 * @param newStatus the new status
	 * @since Envoy Client v0.3-beta
	 */
	public static void changeStatus(UserStatus newStatus) {

		// Sending the already active status is a valid action
		if (newStatus.equals(context.getLocalDB().getUser().getStatus())) return;
		else {
			EventBus.getInstance().dispatch(new OwnStatusChange(newStatus));
			if (context.getClient().isOnline()) context.getClient().send(new UserStatusChange(context.getLocalDB().getUser().getID(), newStatus));
			logger.log(Level.INFO, "A manual status change occurred.");
		}
	}

	/**
	 * Removes the given contact.
	 *
	 * @param block the contact that should be removed
	 * @since Envoy Client v0.3-beta
	 */
	public static void disableContact(Contact block) {
		if (!context.getClient().isOnline() || block == null) return;
		else {
			final var alert = new Alert(AlertType.CONFIRMATION);
			alert.setContentText("Are you sure you want to " + (block instanceof User ? "block " : "leave group ") + block.getName() + "?");
			AlertHelper.confirmAction(alert, () -> {
				final var isUser = block instanceof User;
				context.getClient()
					.send(isUser ? new UserOperation((User) block, ElementOperation.REMOVE)
							: new GroupResize(context.getLocalDB().getUser(), (Group) block, ElementOperation.REMOVE));
				if (!isUser) block.getContacts().remove(context.getLocalDB().getUser());
				EventBus.getInstance().dispatch(new ContactDisabled(block));
				logger.log(Level.INFO, isUser ? "A user was blocked." : "The user left a group.");
			});
		}
	}

	/**
	 * Deletes the given contact with all his messages entirely.
	 *
	 * @param delete the contact to delete
	 * @since Envoy Client v0.3-beta
	 */
	public static void deleteContact(Contact delete) {
		if (delete == null) return;
		else {
			final var alert = new Alert(AlertType.CONFIRMATION);
			alert.setContentText("Are you sure you want to delete " + delete.getName()
					+ " entirely? All messages with this contact will be deleted. This action cannot be undone.");
			AlertHelper.confirmAction(alert, () -> {
				context.getLocalDB().getUsers().remove(delete.getName());
				context.getLocalDB().getChats().removeIf(chat -> chat.getRecipient().equals(delete));
				if (context.getSceneContext().getController() instanceof ChatScene)
					((ChatScene) context.getSceneContext().getController()).resetState();
				logger.log(Level.INFO, "A contact with all his messages was deleted.");
			});
		}
	}
}