/*
 * Copyright 2012 by A-SIT, Secure Information Technology Center Austria
 *
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://joinup.ec.europa.eu/software/page/eupl
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 */
package at.asit.pdfover.gui.composites;

// Imports
import java.io.File;

import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.swt.widgets.Label;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.FormAttachment;
import org.eclipse.swt.layout.FormData;
import org.eclipse.swt.layout.FormLayout;
import org.eclipse.swt.SWT;
import org.eclipse.swt.dnd.*;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;

import at.asit.pdfover.gui.workflow.StateMachineImpl;
import at.asit.pdfover.gui.workflow.states.State;

/**
 * 
 *
 */
public class DataSourceSelectComposite extends StateComposite {

	/**
	 * 
	 */
	private final class FileBrowseDialog implements SelectionListener {
		/**
		 * 
		 */
		public FileBrowseDialog() {
			// Nothing to do here
		}

		@Override
		public void widgetSelected(SelectionEvent e) {
			FileDialog dialog = new FileDialog(DataSourceSelectComposite.this.getShell(), SWT.OPEN);
			dialog.setFilterExtensions(new String[] {"*.pdf"});
			dialog.setFilterNames(new String[] {"PDF Dateien"});
			String fileName = dialog.open();
	        File file = null;
	        if (fileName != null) {
	            file = new File(fileName);
	            if(file.exists()) {
	            	DataSourceSelectComposite.this.setSelected(file);
	            }
	        }
		}

		@Override
		public void widgetDefaultSelected(SelectionEvent e) {
			// Nothing to do here
		}
	}

	/**
	 * SFL4J Logger instance
	 **/
	private static final Logger log = LoggerFactory
			.getLogger(DataSourceSelectComposite.class);

	/**
	 * Set this value through the setter method!!
	 */
	private File selected = null;

	/**
	 * Sets the selected file and calls update to the workflow
	 * @param selected
	 */
	protected void setSelected(File selected) {
		this.selected = selected;
		this.state.updateStateMachine();
	}

	/**
	 * Gets the selected file
	 * 
	 * @return the selected file
	 */
	public File getSelected() {
		return this.selected;
	}

	/**
	 * Create the composite.
	 * 
	 * @param parent
	 * @param style
	 * @param state
	 */
	public DataSourceSelectComposite(Composite parent, int style, State state) {
		super(parent, style, state);


		this.setLayout(new FormLayout());

		Color back = new Color(Display.getCurrent(), 77, 190, 250);

		this.drop_area = new Composite(this, SWT.RESIZE | SWT.BORDER_DASH);
		FormData fd_drop_area = new FormData();
		fd_drop_area.left = new FormAttachment(0, 0);
		fd_drop_area.right = new FormAttachment(100, 0);
		fd_drop_area.top = new FormAttachment(0, 0);
		fd_drop_area.bottom = new FormAttachment(100, 0);
		this.drop_area.setLayoutData(fd_drop_area);
		this.drop_area.setLayout(new FormLayout());
		this.drop_area.setBackground(back);

		DropTarget dnd_target = new DropTarget(this.drop_area, DND.DROP_DEFAULT
				| DND.DROP_COPY);
		final FileTransfer fileTransfer = FileTransfer.getInstance();
		Transfer[] types = new Transfer[] { fileTransfer };
		dnd_target.setTransfer(types);

		dnd_target.addDropListener(new DropTargetListener() {

			@Override
			public void dropAccept(DropTargetEvent event) {
				// TODO Auto-generated method stub

			}

			@Override
			public void drop(DropTargetEvent event) {
				if (fileTransfer.isSupportedType(event.currentDataType)){
					String[] files = (String[])event.data;
					if(files.length > 0) {
						// Only taking first file ...
						File file = new File(files[0]);
						if(!file.exists())
						{
							log.error("File: " + files[0] + " doesnot exists!");
							return;
						}
						DataSourceSelectComposite.this.setSelected(file);
					}
				}
			}

			@Override
			public void dragOver(DropTargetEvent event) {
				// TODO Auto-generated method stub

			}

			@Override
			public void dragOperationChanged(DropTargetEvent event) {
				if (event.detail == DND.DROP_DEFAULT) {
					if ((event.operations & DND.DROP_COPY) != 0) {
						event.detail = DND.DROP_COPY;
					} else {
						event.detail = DND.DROP_NONE;
					}
				}
			}

			@Override
			public void dragLeave(DropTargetEvent event) {
				// No need to do anything here...
			}

			@Override
			public void dragEnter(DropTargetEvent event) {
				if (event.detail == DND.DROP_DEFAULT) {
					if ((event.operations & DND.DROP_COPY) != 0) {
						event.detail = DND.DROP_COPY;
					} else {
						event.detail = DND.DROP_NONE;
					}
				}
				// Only drop one item!
				if(event.dataTypes.length > 1) {
					event.detail = DND.DROP_NONE;
					return;
				}
				// will accept text but prefer to have files dropped
				for (int i = 0; i < event.dataTypes.length; i++) {
					if (fileTransfer.isSupportedType(event.dataTypes[i])) {
						event.currentDataType = event.dataTypes[i];
						// files should only be copied
						if (event.detail != DND.DROP_COPY) {
							event.detail = DND.DROP_NONE;
						}
						break;
					}
				}
			}
		});

		final Label lbl_drag = new Label(this.drop_area, SWT.NONE | SWT.RESIZE);
		FormData fd_lbl_drag = new FormData();
		fd_lbl_drag.left = new FormAttachment(5, 5);
		fd_lbl_drag.right = new FormAttachment(100, -5);
		fd_lbl_drag.top = new FormAttachment(5, 5);
		fd_lbl_drag.bottom = new FormAttachment(55, -5);
		lbl_drag.setLayoutData(fd_lbl_drag);
		FontData[] fD = lbl_drag.getFont().getFontData();
		fD[0].setHeight(18);
		lbl_drag.setFont(new Font(Display.getCurrent(), fD[0]));
		lbl_drag.setText("Drag and Drop");
		lbl_drag.setAlignment(SWT.CENTER);
		lbl_drag.setBackground(back);

		Button btn_open = new Button(this.drop_area, SWT.NATIVE | SWT.RESIZE);
		btn_open.setText("Choose file ...");
		Point size = btn_open.computeSize(SWT.DEFAULT, SWT.DEFAULT);
		FormData fd_btn_open = new FormData();
		fd_btn_open.left = new FormAttachment(100, size.x * -1 - 10);
		fd_btn_open.right = new FormAttachment(100, -5);
		fd_btn_open.top = new FormAttachment(100, size.y * -1 - 10);
		fd_btn_open.bottom = new FormAttachment(100, -5);
		btn_open.setLayoutData(fd_btn_open);
		btn_open.setBackground(back);
		btn_open.addSelectionListener(new FileBrowseDialog());
		this.drop_area.pack();

		/*
		 * Button btn = new Button(this, SWT.NATIVE); btn.setBounds(50, 20, 100,
		 * 50); btn.setText("Click Me"); btn.addSelectionListener(new
		 * SelectionListener() {
		 * 
		 * @Override public void widgetSelected(SelectionEvent arg0) {
		 * DataSourceSelectComposite.this.setPress(true);
		 * DataSourceSelectComposite.this.workflow.update(); }
		 * 
		 * @Override public void widgetDefaultSelected(SelectionEvent arg0) { //
		 * TODO Auto-generated method stub
		 * 
		 * } });
		 */
	}

	private boolean press = false;

	private Composite drop_area;

	@Override
	protected void checkSubclass() {
		// Disable the check that prevents subclassing of SWT components
	}

	/**
	 * @return the press
	 */
	public boolean isPress() {
		return this.press;
	}

	/**
	 * @param press
	 *            the press to set
	 */
	public void setPress(boolean press) {
		this.press = press;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see at.asit.pdfover.gui.components.StateComposite#doLayout()
	 */
	@Override
	public void doLayout() {
		this.layout(true, true);
		this.drop_area.layout(true, true);
	}
}