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/*******************************************************************************
 * Copyright 2011 See AUTHORS file.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/

package com.badlogic.gdx.backends.lwjgl;

import java.awt.Toolkit;
import java.awt.datatransfer.ClipboardOwner;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.StringSelection;
import java.awt.datatransfer.Transferable;
import java.io.File;
import java.util.List;

import com.badlogic.gdx.utils.Clipboard;

/** Clipboard implementation for desktop that uses the system clipboard via the default AWT {@link Toolkit}.
 * @author mzechner */
public class LwjglClipboard implements Clipboard, ClipboardOwner {
	@Override
	public boolean hasContents () {
		String contents = getContents();
		return contents != null && !contents.isEmpty();
	}

	@Override
	public String getContents () {
		try {
			java.awt.datatransfer.Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
			Transferable contents = clipboard.getContents(null);
			if (contents != null) {
				if (contents.isDataFlavorSupported(DataFlavor.stringFlavor)) {
					try {
						return (String)contents.getTransferData(DataFlavor.stringFlavor);
					} catch (Throwable ex) {
					}
				}
				if (contents.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) {
					try {
						List files = (List)contents.getTransferData(DataFlavor.javaFileListFlavor);
						StringBuilder buffer = new StringBuilder(128);
						for (int i = 0, n = files.size(); i < n; i++) {
							if (buffer.length() > 0) buffer.append('\n');
							buffer.append(files.get(i).toString());
						}
						return buffer.toString();
					} catch (RuntimeException ex) {
					}
				}
			}
		} catch (Throwable ignored) { // Ignore JDK crashes sorting data flavors.
		}
		return "";
	}

	@Override
	public void setContents (String content) {
		try {
			StringSelection stringSelection = new StringSelection(content);
			java.awt.datatransfer.Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
			clipboard.setContents(stringSelection, this);
		} catch (Throwable ignored) { // Ignore JDK crashes sorting data flavors.
		}
	}

	@Override
	public void lostOwnership (java.awt.datatransfer.Clipboard arg0, Transferable arg1) {
	}
}