package envoy.client.util;

import java.awt.Toolkit;
import java.awt.datatransfer.StringSelection;
import java.io.*;
import java.util.logging.*;

import javafx.stage.FileChooser;

import dev.kske.eventbus.core.EventBus;

import envoy.data.Message;
import envoy.util.EnvoyLog;

import envoy.client.data.*;
import envoy.client.event.MessageDeletion;
import envoy.client.ui.controller.ChatScene;

/**
 * Contains methods that are commonly used for {@link Message}s.
 *
 * @author Leon Hofmeister
 * @since Envoy Client v0.3-beta
 */
public class MessageUtil {

	private MessageUtil() {}

	private static Logger logger = EnvoyLog.getLogger(MessageUtil.class);

	/**
	 * Copies the text of the given message to the System Clipboard.
	 *
	 * @param message the message whose text to copy
	 * @since Envoy Client v0.3-beta
	 */
	public static void copyMessageText(Message message) {
		logger.log(Level.FINEST,
			"A copy of message text \"" + message.getText() + "\" was requested");
		Toolkit.getDefaultToolkit().getSystemClipboard()
			.setContents(new StringSelection(message.getText()), null);
	}

	/**
	 * Deletes the given message.
	 *
	 * @param message the message to delete
	 * @since Envoy Client v0.3-beta
	 */
	public static void deleteMessage(Message message) {
		final var	messageDeletionEvent	= new MessageDeletion(message.getID());
		final var	controller				=
			Context.getInstance().getSceneContext().getController();
		if (controller instanceof ChatScene)
			((ChatScene) controller).clearMessageSelection();

		// Removing the message locally
		EventBus.getInstance().dispatch(messageDeletionEvent);

		logger.log(Level.FINEST, "message deletion was requested for " + message);
	}

	/**
	 * Forwards the given message. Currently not implemented.
	 *
	 * @param message the message to forward
	 * @since Envoy Client v0.3-beta
	 */
	public static void forwardMessage(Message message) {
		logger.log(Level.FINEST, "Message forwarding was requested for " + message);
	}

	/**
	 * Quotes the given message. Currently not implemented.
	 *
	 * @param message the message to quote
	 * @since Envoy Client v0.3-beta
	 */
	public static void quoteMessage(Message message) {
		logger.log(Level.FINEST, "Message quotation was requested for " + message);
	}

	/**
	 * Saves the attachment of a message, if present.
	 *
	 * @param message the message whose attachment to save
	 * @throws IllegalStateException if no attachment is present in the message
	 * @since Envoy Client v0.3-beta
	 */
	public static void saveAttachment(Message message) {
		if (!message.hasAttachment())
			throw new IllegalArgumentException("Cannot save a non-existing attachment");
		File		file;
		final var	fileName			= message.getAttachment().getName();
		final var	downloadLocation	= Settings.getInstance().getDownloadLocation();

		// Show save file dialog, if the user did not opt-out
		if (!Settings.getInstance().isDownloadSavedWithoutAsking()) {
			final var fileChooser = new FileChooser();
			fileChooser.setInitialFileName(fileName);
			fileChooser.setInitialDirectory(downloadLocation);
			file = fileChooser.showSaveDialog(Context.getInstance().getSceneContext().getStage());
		} else
			file = new File(downloadLocation, fileName);

		// A file was selected
		if (file != null)
			try (var fos = new FileOutputStream(file)) {
				fos.write(message.getAttachment().getData());
				logger.log(Level.FINE,
					"Attachment of message was saved at " + file.getAbsolutePath());
			} catch (final IOException e) {
				logger.log(Level.WARNING, "Could not save attachment of " + message + ": ", e);
			}
	}
}