/*******************************************************************************
 * Copyright (c) 2012, 2013 Wind River Systems 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:
 *     Wind River Systems - initial API and implementation
 *     IBM Corporation - bug fixing
 *******************************************************************************/
package org.eclipse.debug.ui.actions;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;

import org.eclipse.debug.internal.ui.actions.ToggleBreakpointsTargetManager;
import org.eclipse.debug.internal.ui.actions.breakpoints.Messages;
import org.eclipse.debug.ui.DebugUITools;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.action.ActionContributionItem;
import org.eclipse.jface.action.ContributionItem;
import org.eclipse.jface.action.IContributionItem;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.MenuItem;
import org.eclipse.ui.IPartService;
import org.eclipse.ui.ISelectionService;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.actions.CompoundContributionItem;
import org.eclipse.ui.menus.IWorkbenchContribution;
import org.eclipse.ui.services.IServiceLocator;

/**
 * Breakpoint ruler pop-up action that creates a sub-menu to select the currently
 * active breakpoint type. This menu contribution can be added to an editor
 * with the <code>org.eclipse.ui.menus</code> extension point.  The breakpoint
 * types are calculated based on the toggle breakpoint target factories
 * contributed through the <code>toggleBreakpointsTargetFactories</code> extension point.
 * <p>
 * Following is example plug-in XML used to contribute this action to an editor's
 * vertical ruler context menu.
 * <pre>
 * &lt;extension point="org.eclipse.ui.menus"&gt;
 *   &lt;menuContribution
 *     locationURI="popup:#CEditorRulerContext?after=additions"
 *     id="example.RulerPopupActions"&gt;
 *       &lt;menu\
 *         id="breakpointTypes"
 *         label="Toggle Breakpoint"&gt;
 *         &lt;dynamic\
 *           id="example.rulerContextMenu.breakpointTypesAction"&gt;
 *           class="org.eclipse.debug.ui.actions.BreakpointTypesContribution"
 *         menubarPath="additions"&gt;/
 *       &lt;/menu&gt;
 *   &lt;/menuContribution&gt;
 * </pre>
 * </p>
 * <p>
 * Clients may refer to this class in plug-in XML. This class
 * is not intended to be sub-classed.
 * </p>
 * @since 3.8
 * @noextend This class is not intended to be sub-classed by clients.
 */
public class BreakpointTypesContribution extends CompoundContributionItem implements IWorkbenchContribution {

    private class SelectTargetAction extends Action {
		private final Set<String> fPossibleIDs;
        private final String fID;

		SelectTargetAction(String name, Set<String> possibleIDs, String ID) {
            super(name, AS_RADIO_BUTTON);
            fID = ID;
            fPossibleIDs = possibleIDs;
        }

        @Override
		public void run() {
            if (isChecked()) {
                // Note: setPreferredTarget is not declared on the
                // IToggleBreakpontsTargetManager interface.
                ToggleBreakpointsTargetManager.getDefault().setPreferredTarget(fPossibleIDs, fID);
            }
        }
    }

    private IServiceLocator fServiceLocator;

    private static IContributionItem[] NO_BREAKPOINT_TYPES_CONTRIBUTION_ITEMS = new IContributionItem[] {
    	new ContributionItem() {
			@Override
			public void fill(Menu menu, int index) {
				MenuItem item = new MenuItem(menu, SWT.NONE);
				item.setEnabled(false);
				item.setText(Messages.BreakpointTypesContribution_0);
			}

			@Override
			public boolean isEnabled() {
				return false;
			}
    	}
    };

    /* (non-Javadoc)
     * @see org.eclipse.ui.actions.CompoundContributionItem#getContributionItems()
     */
    @Override
	protected IContributionItem[] getContributionItems() {
        IWorkbenchPart part = null;
        ISelection selection = null;

        ISelectionService selectionService =
            fServiceLocator.getService(ISelectionService.class);
        if (selectionService != null) {
            selection = selectionService.getSelection();
        }
        IPartService partService = fServiceLocator.getService(IPartService.class);
        if (partService != null) {
            part = partService.getActivePart();
        }

        // If no part or selection, disable all.
        if (part == null || selection == null) {
            return NO_BREAKPOINT_TYPES_CONTRIBUTION_ITEMS;
        }

        // Get breakpoint toggle target IDs.
        IToggleBreakpointsTargetManager manager = DebugUITools.getToggleBreakpointsTargetManager();
		Set<String> enabledIDs = manager.getEnabledToggleBreakpointsTargetIDs(part, selection);
        String preferredId = manager.getPreferredToggleBreakpointsTargetID(part, selection);

		List<Action> actions = new ArrayList<Action>(enabledIDs.size());
		for (String id : enabledIDs) {
            Action action = new SelectTargetAction(manager.getToggleBreakpointsTargetName(id), enabledIDs, id);
            if (id.equals(preferredId)) {
                action.setChecked(true);
            }
            actions.add(action);
        }

        if ( enabledIDs.isEmpty() ) {
            return NO_BREAKPOINT_TYPES_CONTRIBUTION_ITEMS;
        }

        IContributionItem[] items = new IContributionItem[enabledIDs.size()];
        for (int i = 0; i < actions.size(); i++) {
            items[i] = new ActionContributionItem(actions.get(i));
        }
        return items;
    }

    /* (non-Javadoc)
     * @see org.eclipse.ui.menus.IWorkbenchContribution#initialize(org.eclipse.ui.services.IServiceLocator)
     */
    @Override
	public void initialize(IServiceLocator serviceLocator) {
        fServiceLocator = serviceLocator;
    }
}