/*******************************************************************************
 * Copyright (c) 2000, 2013 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
 *******************************************************************************/
package org.eclipse.ant.internal.ui.preferences;

import java.util.List;

import org.eclipse.ant.internal.core.IAntCoreConstants;
import org.eclipse.ant.internal.ui.AntUIPlugin;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Path;
import org.eclipse.core.runtime.Status;
import org.eclipse.jface.dialogs.IDialogSettings;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
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.ui.dialogs.ElementTreeSelectionDialog;
import org.eclipse.ui.dialogs.ISelectionStatusValidator;
import org.eclipse.ui.model.WorkbenchContentProvider;
import org.eclipse.ui.model.WorkbenchLabelProvider;
import org.eclipse.ui.views.navigator.ResourceComparator;

public class FileSelectionDialog extends ElementTreeSelectionDialog {

	private FileFilter fFilter;
	private String fFilterMessage;
	private boolean fShowAll = false;
	private final static String DIALOG_SETTING = "AntPropertiesFileSelectionDialog.showAll"; //$NON-NLS-1$
	private final static String LAST_CONTAINER = "AntPropertiesFileSelectionDialog.lastContainer"; //$NON-NLS-1$

	public FileSelectionDialog(Shell parent, List<IFile> files, String title, String message, String filterExtension, String filterMessage) {
		super(parent, new WorkbenchLabelProvider(), new WorkbenchContentProvider());

		setTitle(title);
		setMessage(message);
		fFilter = new FileFilter(files, filterExtension);
		fFilterMessage = filterMessage;
		setInput(ResourcesPlugin.getWorkspace().getRoot());
		setComparator(new ResourceComparator(ResourceComparator.NAME));

		ISelectionStatusValidator validator = new ISelectionStatusValidator() {
			@Override
			public IStatus validate(Object[] selection) {
				if (selection.length == 0) {
					return new Status(IStatus.ERROR, AntUIPlugin.getUniqueIdentifier(), 0, IAntCoreConstants.EMPTY_STRING, null);
				}
				for (int i = 0; i < selection.length; i++) {
					if (!(selection[i] instanceof IFile)) {
						return new Status(IStatus.ERROR, AntUIPlugin.getUniqueIdentifier(), 0, IAntCoreConstants.EMPTY_STRING, null);
					}
				}
				return new Status(IStatus.OK, AntUIPlugin.getUniqueIdentifier(), 0, IAntCoreConstants.EMPTY_STRING, null);
			}
		};
		setValidator(validator);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.dialogs.Dialog#createDialogArea(org.eclipse.swt.widgets.Composite)
	 */
	@Override
	protected Control createDialogArea(Composite parent) {

		Composite result = (Composite) super.createDialogArea(parent);
		final Button button = new Button(result, SWT.CHECK);
		button.setText(fFilterMessage);
		button.setFont(parent.getFont());

		IDialogSettings settings = AntUIPlugin.getDefault().getDialogSettings();
		fShowAll = settings.getBoolean(DIALOG_SETTING);

		String lastPath = settings.get(LAST_CONTAINER);
		if (lastPath != null) {
			IPath path = Path.fromPortableString(lastPath);
			IResource resource = ResourcesPlugin.getWorkspace().getRoot().findMember(path);
			setInitialSelection(resource);
		}

		fFilter.considerExtension(!fShowAll);
		getTreeViewer().addFilter(fFilter);
		if (!fShowAll) {
			button.setSelection(true);
		}

		button.addSelectionListener(new SelectionAdapter() {
			@Override
			public void widgetSelected(SelectionEvent event) {
				if (button.getSelection()) {
					fShowAll = false;
				} else {
					fShowAll = true;
				}
				fFilter.considerExtension(!fShowAll);
				getTreeViewer().refresh();
			}
		});
		applyDialogFont(result);
		return result;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.window.Window#close()
	 */
	@Override
	public boolean close() {
		IDialogSettings settings = AntUIPlugin.getDefault().getDialogSettings();
		settings.put(DIALOG_SETTING, fShowAll);

		Object[] result = getResult();
		if (result != null && result.length > 0) {
			settings.put(LAST_CONTAINER, ((IResource) result[0]).getParent().getFullPath().toPortableString());
		}
		return super.close();
	}
}