package dev.kske.chess.ui;

import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.dnd.DnDConstants;
import java.awt.dnd.DropTargetAdapter;
import java.awt.dnd.DropTargetDropEvent;
import java.io.File;
import java.io.IOException;
import java.util.List;

/**
 * Enables drag and drop support of {@code FEN} and {@code PGN} files for the
 * {@link MainWindow}.<br>
 * <br>
 * Project: <strong>Chess</strong><br>
 * File: <strong>GameDropTarget.java</strong><br>
 * Created: <strong>13 Aug 2019</strong><br>
 *
 * @since Chess v0.3-alpha
 * @author Kai S. K. Engelbart
 */
public class GameDropTarget extends DropTargetAdapter {

	private MainWindow mainWindow;

	/**
	 * Creates an instance of {@link GameDropTarget}.
	 *
	 * @param mainWindow the {@link MainWindow} onto which {@code FEN} and
	 *                   {@code PGN} files can be dropped
	 */
	public GameDropTarget(MainWindow mainWindow) {
		this.mainWindow = mainWindow;
	}

	@SuppressWarnings("unchecked")
	@Override
	public void drop(DropTargetDropEvent evt) {
		try {
			evt.acceptDrop(DnDConstants.ACTION_COPY_OR_MOVE);
			mainWindow.loadFiles(
				(List<File>) evt.getTransferable()
					.getTransferData(DataFlavor.javaFileListFlavor)
			);
		} catch (UnsupportedFlavorException | IOException ex) {
			ex.printStackTrace();
			evt.rejectDrop();
		}
	}
}