/*******************************************************************************

 * Copyright (c) 2004, 2009 Tasktop Technologies 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:

 *     Tasktop Technologies - initial API and implementation

 *******************************************************************************/

package org.eclipse.mylyn.internal.bugzilla.ui.editor;

import java.util.ArrayList;

import java.util.Collection;

import java.util.HashSet;

import java.util.List;

import java.util.Set;

import java.util.StringTokenizer;

import org.eclipse.jface.dialogs.Dialog;

import org.eclipse.jface.viewers.CheckStateChangedEvent;

import org.eclipse.jface.viewers.CheckboxTableViewer;

import org.eclipse.jface.viewers.ICheckStateListener;

import org.eclipse.jface.viewers.ITreeContentProvider;

import org.eclipse.jface.viewers.Viewer;

import org.eclipse.swt.SWT;

import org.eclipse.swt.layout.GridData;

import org.eclipse.swt.layout.GridLayout;

import org.eclipse.swt.widgets.Composite;

import org.eclipse.swt.widgets.Control;

import org.eclipse.swt.widgets.Shell;

/**

 * @author Shawn Minto

 */

public class KeywordsDialog extends Dialog {

	private final List<String> selectedKeywords;

	private final List<String> validKeywords;

	private CheckboxTableViewer keyWordsList;

	public KeywordsDialog(Shell shell, String selectedKeywords, java.util.List<String> validKeywords) {

		super(shell);

		setShellStyle(getShellStyle() | SWT.RESIZE);

		StringTokenizer st = new StringTokenizer(selectedKeywords, ",", false); //$NON-NLS-1$

		this.selectedKeywords = new ArrayList<String>();

		while (st.hasMoreTokens()) {

			String s = st.nextToken().trim();

			this.selectedKeywords.add(s);

		}

		this.validKeywords = validKeywords;

	}

	@Override

	protected Control createDialogArea(Composite parent) {

		getShell().setText(Messages.KeywordsDialog_Select_Keywords);

		Composite composite = new Composite(parent, SWT.NONE);

		composite.setLayout(new GridLayout());

		GridData gd = new GridData(GridData.GRAB_HORIZONTAL | GridData.GRAB_VERTICAL | GridData.FILL_BOTH);

		composite.setLayoutData(gd);

		keyWordsList = CheckboxTableViewer.newCheckList(composite, SWT.MULTI | SWT.V_SCROLL | SWT.BORDER);

		GridData keyWordsTextData = new GridData(GridData.GRAB_HORIZONTAL | GridData.GRAB_VERTICAL | GridData.FILL_BOTH);

		keyWordsTextData.heightHint = 175;

		keyWordsTextData.widthHint = 160;

		keyWordsList.getTable().setLayoutData(keyWordsTextData);

		if (validKeywords != null) {

			keyWordsList.setContentProvider(new ITreeContentProvider() {

				public Object[] getChildren(Object parentElement) {

					if (parentElement instanceof Collection<?>) {

						return ((Collection<?>) parentElement).toArray();

					}

					return null;

				}

				public Object getParent(Object element) {

					return null;

				}

				public boolean hasChildren(Object element) {

					return false;

				}

				public Object[] getElements(Object inputElement) {

					return getChildren(inputElement);

				}

				public void dispose() {

				}

				public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {

				}

			});

			Set<String> invalidKeywords = new HashSet<String>();

			keyWordsList.setInput(validKeywords);

			for (String keyword : selectedKeywords) {

				if (!keyWordsList.setChecked(keyword, true)) {

					invalidKeywords.add(keyword);

				}

			}

			selectedKeywords.removeAll(invalidKeywords);

		}

		keyWordsList.addCheckStateListener(new KeywordListener());

		parent.pack();

		applyDialogFont(composite);

		return composite;

	}

	protected class KeywordListener implements ICheckStateListener {

		public void checkStateChanged(CheckStateChangedEvent event) {

			if (event.getChecked()) {

				selectedKeywords.add((String) event.getElement());

			} else {

				selectedKeywords.remove(event.getElement());

			}

		}

	}

	public List<String> getSelectedKeywords() {

		return selectedKeywords;

	}

	public String getSelectedKeywordsString() {

		StringBuffer keywords = new StringBuffer();

		for (String sel : selectedKeywords) {

			keywords.append(sel);

			keywords.append(","); //$NON-NLS-1$

		}

		String keywordsString = keywords.toString();

		if (keywordsString.endsWith(",")) { //$NON-NLS-1$

			keywordsString = keywordsString.substring(0, keywordsString.length() - 1);

		}

		return keywordsString;

	}

}

	public static String KeywordsDialog_Select_Keywords;

KeywordsDialog_Select_Keywords=Select Keywords