/*******************************************************************************
 * Copyright (c) 2000, 2009 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.launchConfigurations;

import org.eclipse.ant.core.AntCorePlugin;
import org.eclipse.ant.core.AntCorePreferences;
import org.eclipse.ant.internal.launching.launchConfigurations.AntHomeClasspathEntry;
import org.eclipse.ant.internal.ui.AntUIPlugin;
import org.eclipse.ant.internal.ui.IAntUIConstants;
import org.eclipse.ant.internal.ui.preferences.AntPreferencesMessages;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.jdt.internal.debug.ui.actions.RuntimeClasspathAction;
import org.eclipse.jdt.internal.debug.ui.classpath.ClasspathEntry;
import org.eclipse.jdt.internal.debug.ui.launcher.IClasspathViewer;
import org.eclipse.jdt.launching.IRuntimeClasspathEntry;
import org.eclipse.jdt.launching.IRuntimeClasspathEntry2;
import org.eclipse.jface.dialogs.IDialogSettings;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.swt.widgets.DirectoryDialog;

/**
 * Edits the Ant Home classpath entry.
 * 
 * @since 3.0
 */
public class EditAntHomeEntryAction extends RuntimeClasspathAction {
	
	private AntClasspathTab fTab;
	/**
	 * Constructs an action to edit the Ant Home setting for a launch config.
	 * 
	 * @param viewer classpath viewer
	 */
	public EditAntHomeEntryAction(IClasspathViewer viewer, AntClasspathTab tab) {
		super(AntLaunchConfigurationMessages.EditAntHomeEntryAction_1, viewer);
		fTab = tab;
	}
	
	
	/* (non-Javadoc)
	 * @see org.eclipse.jface.action.IAction#run()
	 */
	public void run() {
		IDialogSettings dialogSettings = AntUIPlugin.getDefault().getDialogSettings();
		String lastUsedPath= dialogSettings.get(IAntUIConstants.DIALOGSTORE_LASTANTHOME);
		if (lastUsedPath == null) {
			lastUsedPath= ResourcesPlugin.getWorkspace().getRoot().getLocation().toOSString();
		}
		DirectoryDialog dialog = new DirectoryDialog(getShell());
		dialog.setMessage(AntPreferencesMessages.AntClasspathBlock_3);
		dialog.setFilterPath(lastUsedPath);
		String path = dialog.open();
		if (path == null) {
			return;
		}
		dialogSettings.put(IAntUIConstants.DIALOGSTORE_LASTANTHOME, path);
		AntCorePreferences preferences = AntCorePlugin.getPlugin().getPreferences();
		String defaultHome = preferences.getAntHome();
		if (path.equalsIgnoreCase(defaultHome)) {
			path = null;
		}
		fTab.setDirty(true);
		// update existing entry or add a new one
		IRuntimeClasspathEntry[] entries = getViewer().getEntries();
		for (int i = 0; i < entries.length; i++) {
			IRuntimeClasspathEntry entry = entries[i];
			if (entry.getType() == IRuntimeClasspathEntry.OTHER) {
				IRuntimeClasspathEntry2 entry2 = (IRuntimeClasspathEntry2)((ClasspathEntry)entry).getDelegate();
				if (entry2.getTypeId().equals(AntHomeClasspathEntry.TYPE_ID)) {
					((AntHomeClasspathEntry)entry2).setAntHome(path);
					getViewer().refresh(entry);
					getViewer().notifyChanged();
					return;
				}
			}
		}				
		// no entry found - add a new one
		getViewer().addEntries(new IRuntimeClasspathEntry[]{new AntHomeClasspathEntry(path)});		
	}
	
	/**
	 * @see SelectionListenerAction#updateSelection(IStructuredSelection)
	 */
	protected boolean updateSelection(IStructuredSelection selection) {
		return true;
	}	
}