package org.expeditee.gio.javafx;

import java.io.File;
import java.io.IOException;
import java.util.List;

import org.expeditee.core.Point;
import org.expeditee.gio.DragAndDropManager;
import org.expeditee.gui.MessageBay;

import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.input.DataFormat;
import javafx.scene.input.DragEvent;
import javafx.scene.input.Dragboard;
import javafx.scene.input.TransferMode;

public class JavaFXDragAndDropManager extends DragAndDropManager {
	
	/** Singleton instance. */
	private static JavaFXDragAndDropManager _instance;
	
	/** Singleton instantiator. */
	public static JavaFXDragAndDropManager getInstance()
	{
		if (_instance == null) _instance = new JavaFXDragAndDropManager();
		
		return _instance;
	}

	// GNOME and KDE desktops have a specialized way of DNDing files
	private DataFormat _URIListDataflavorString = new DataFormat("text/uri-list;class=java.lang.String");
	private DataFormat _URIListDataflavorCharArray = new DataFormat("text/uri-list;class=\"[C\"");
	
	private JavaFXDragAndDropManager()
	{
		Scene scene = JavaFXGraphicsManager.ExpediteeApplication.theScene;
		
		scene.setOnDragOver(new EventHandler<DragEvent>() {
			@Override
			public void handle(DragEvent event)
			{
				Dragboard dragboard = event.getDragboard();
				if (	dragboard.hasString() ||
						dragboard.hasFiles() ||
						dragboard.hasContent(_URIListDataflavorString) ||
						dragboard.hasContent(_URIListDataflavorCharArray))
					
				{
					event.acceptTransferModes(TransferMode.COPY);
				}
				event.consume();
			}
		});
		
		scene.setOnDragDropped(new EventHandler<DragEvent>() {
			@Override
			public void handle(DragEvent event)
			{
				Dragboard dragboard = event.getDragboard();
				Point dropPoint = new Point((int) event.getX(), (int) event.getY());
				boolean success = false;
				try {
					
					if (dragboard.hasFiles()) {
						List<File> files = dragboard.getFiles();
						if (files != null && files.size() > 0) {
							importFileList(files, dropPoint, false);
						}
					} else if (dragboard.hasContent(_URIListDataflavorString)) {
						String data = (String) dragboard.getContent(_URIListDataflavorString);
						List<File> files = textURIListToFileList(data);
						importFileList(files, dropPoint, false);
						success = true;
					} else if (dragboard.hasContent(_URIListDataflavorCharArray)) {
						char[] data = (char[]) dragboard.getContent(_URIListDataflavorCharArray);
						String uriString = new String(data);
						List<File> files = textURIListToFileList(uriString);
						importFileList(files, dropPoint, false);
						success = true;
					} else if (dragboard.hasString()) {
						String str = dragboard.getString();
						if (str != null && str.length() > 0) {
							importString(str, dropPoint, false);
							success = true;
						}
					}
				} catch (IOException e) {
					e.printStackTrace();
					MessageBay.displayMessage("Failed to import data in Expeditee");
				}
				event.setDropCompleted(success);
				event.consume();
			}
		});
	}

}