package envoy.client.ui;

import java.io.File;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;

import javafx.application.Application;
import javafx.scene.control.Alert;
import javafx.scene.control.Alert.AlertType;
import javafx.stage.Stage;

import envoy.client.data.*;
import envoy.client.net.Client;
import envoy.client.ui.SceneContext.SceneInfo;
import envoy.client.ui.controller.LoginScene;
import envoy.data.GroupMessage;
import envoy.data.Message;
import envoy.event.GroupMessageStatusChange;
import envoy.event.MessageStatusChange;
import envoy.util.EnvoyLog;

/**
 * Handles application startup and shutdown.
 * <p>
 * Project: <strong>envoy-client</strong><br>
 * File: <strong>Startup.java</strong><br>
 * Created: <strong>26.03.2020</strong><br>
 *
 * @author Kai S. K. Engelbart
 * @author Maximilian K&auml;fer
 * @since Envoy Client v0.1-beta
 */
public final class Startup extends Application {

	/**
	 * The version of this client. Used to verify compatibility with the server.
	 *
	 * @since Envoy Client v0.1-beta
	 */
	public static final String VERSION = "0.1-beta";

	private LocalDB	localDB;
	private Client	client;

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

	/**
	 * Loads the configuration, initializes the client and the local database and
	 * delegates the rest of the startup process to {@link LoginScene}.
	 *
	 * @since Envoy Client v0.1-beta
	 */
	@Override
	public void start(Stage stage) throws Exception {
		try {
			config.loadAll(Startup.class, "client.properties", getParameters().getRaw().toArray(new String[0]));
			EnvoyLog.initialize(config);
		} catch (final IllegalStateException e) {
			new Alert(AlertType.ERROR, "Error loading configuration values:\n" + e);
			logger.log(Level.SEVERE, "Error loading configuration values: ", e);
			System.exit(1);
		}
		logger.log(Level.INFO, "Envoy starting...");

		// Initialize the local database
		if (config.isIgnoreLocalDB()) {
			localDB = new TransientLocalDB();
			new Alert(AlertType.WARNING, "Ignoring local database.\nMessages will not be saved!").showAndWait();
		} else try {
			localDB = new PersistentLocalDB(new File(config.getHomeDirectory(), config.getLocalDB().getPath()));
		} catch (final IOException e3) {
			logger.log(Level.SEVERE, "Could not initialize local database: ", e3);
			new Alert(AlertType.ERROR, "Could not initialize local database!\n" + e3).showAndWait();
			System.exit(1);
			return;
		}

		// Initialize client and unread message cache
		client = new Client();

		final var cacheMap = new CacheMap();
		cacheMap.put(Message.class, new Cache<Message>());
		cacheMap.put(GroupMessage.class, new Cache<GroupMessage>());
		cacheMap.put(MessageStatusChange.class, new Cache<MessageStatusChange>());
		cacheMap.put(GroupMessageStatusChange.class, new Cache<GroupMessageStatusChange>());

		stage.setTitle("Envoy");
		stage.getIcons().add(IconUtil.loadIcon("envoy_logo"));

		final var sceneContext = new SceneContext(stage);
		sceneContext.load(SceneInfo.LOGIN_SCENE);
		sceneContext.<LoginScene>getController().initializeData(client, localDB, cacheMap, sceneContext);
	}

	/**
	 * Closes the client connection and saves the local database and settings.
	 *
	 * @since Envoy Client v0.1-beta
	 */
	@Override
	public void stop() {
		try {
			logger.log(Level.INFO, "Saving local database and settings...");
			localDB.save(client.isOnline());
			Settings.getInstance().save();

			logger.log(Level.INFO, "Closing connection...");
			client.close();

			logger.log(Level.INFO, "Envoy was terminated by its user");
		} catch (final Exception e) {
			logger.log(Level.SEVERE, "Unable to save local files: ", e);
		}
	}
}