/*******************************************************************************
 * Copyright (c) 2004, 2005 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - Initial API and implementation
 *     Jens Lukowski/Innoopract - initial renaming/restructuring
 *******************************************************************************/
package org.eclipse.wst.common.ui.internal.dialogs;

import org.eclipse.core.resources.IFile;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.jface.dialogs.TitleAreaDialog;
import org.eclipse.jface.resource.DeviceResourceException;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.wst.common.ui.internal.UIPlugin;
import org.eclipse.wst.common.ui.internal.viewers.SelectSingleFileView;


public class SelectSingleFileDialog extends TitleAreaDialog {
	protected SelectSingleFileView selectSingleFileView;
	protected Button okButton;
	protected Image image;
	private ImageDescriptor imageDescriptor;

	public SelectSingleFileDialog(Shell parentShell, IStructuredSelection selection, boolean isFileMandatory) {
		super(parentShell);
		setShellStyle(getShellStyle() | SWT.RESIZE);
		if (selection == null) {
			selection = new StructuredSelection();
		}
		selectSingleFileView = new SelectSingleFileView(selection, isFileMandatory) {
			public void createFilterControl(Composite composite) {
				SelectSingleFileDialog.this.createFilterControl(composite);
			}
		};
	}

	protected Control createDialogArea(Composite parent) {
		Composite dialogArea = (Composite) super.createDialogArea(parent);

		// TODO.. enable context help
		// WorkbenchHelp.setHelp(dialogArea,
		// B2BGUIContextIds.BTBG_SELECT_SINGLE_FILE_DIALOG);

		Composite composite = new Composite(dialogArea, SWT.NONE);
		composite.setLayout(new GridLayout());
		GridData gd = new GridData(GridData.FILL_BOTH);
		gd.widthHint = 350;
		gd.heightHint = 350;
		composite.setLayoutData(gd);

		SelectSingleFileView.Listener listener = new SelectSingleFileView.Listener() {
			public void setControlComplete(boolean isComplete) {
				okButton.setEnabled(isComplete);
			}
		};
		selectSingleFileView.setListener(listener);
		selectSingleFileView.createControl(composite);
		return dialogArea;
	}

	protected void createButtonsForButtonBar(Composite parent) {
		okButton = createButton(parent, IDialogConstants.OK_ID, IDialogConstants.OK_LABEL, true);
		okButton.setEnabled(false);
		createButton(parent, IDialogConstants.CANCEL_ID, IDialogConstants.CANCEL_LABEL, false);
	}

	public void create() {
		super.create();
		selectSingleFileView.setVisibleHelper(true);
		image = getSaveAsImage();
		setTitleImage(image);
	}

	/**
	 * this image was copied from org.eclipse.ui.ide/icons/full/wizban/ where
	 * it is a non-API image, denoted by
	 * IDEInternalWorkbenchImages.IMG_DLGBAN_SAVEAS_DLG.
	 */
	private Image getSaveAsImage() {
		Image localimage = null;
		try {
			if (imageDescriptor == null) {
				imageDescriptor = UIPlugin.getDefault().getImageDescriptor("icons/saveas_wiz.png");
			}
			localimage = (Image) imageDescriptor.createResource(getContents().getDisplay());
		}
		catch (DeviceResourceException e) {
			// if image not found
			localimage = (ImageDescriptor.getMissingImageDescriptor()).createImage();
		}
		return localimage;
	}

	public void createFilterCombo(Composite composite) {
	}

	public IFile getFile() {
		return selectSingleFileView.getFile();
	}

	public void addFilterExtensions(String[] filterExtensions) {
		selectSingleFileView.addFilterExtensions(filterExtensions);
	}

	public void addFilterExtensions(String[] filterExtensions, IFile[] excludedFiles) {
		selectSingleFileView.addFilterExtensions(filterExtensions, excludedFiles);
	}

	public void createFilterControl(Composite composite) {
	}

	public boolean close() {
		if (image != null && imageDescriptor != null) {
			imageDescriptor.destroyResource(image);
			image = null;
		}
		return super.close();
	}
}