/*******************************************************************************
 * Copyright (c) 2006 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.ui.internal.registry;

import java.util.HashMap;
import java.util.Map;

import org.eclipse.core.commands.IParameterValues;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.wizards.IWizardCategory;
import org.eclipse.ui.wizards.IWizardDescriptor;
import org.eclipse.ui.wizards.IWizardRegistry;

/**
 * Provides the parameter values for a show wizard command.
 * <p>
 * This class is only intended to be extended by the three inner classes (<code>Export</code>,
 * <code>Import</code> and <code>New</code>) defined here.
 * </p>
 */
public abstract class WizardParameterValues implements IParameterValues {

	/**
	 * Provides the parameter values for export wizards.
	 */
	public static final class Export extends WizardParameterValues {
		protected IWizardRegistry getWizardRegistry() {
			return PlatformUI.getWorkbench().getExportWizardRegistry();
		}
	}

	/**
	 * Provides the parameter values for import wizards.
	 */
	public static final class Import extends WizardParameterValues {
		protected IWizardRegistry getWizardRegistry() {
			return PlatformUI.getWorkbench().getImportWizardRegistry();
		}
	}

	/**
	 * Provides the parameter values for new wizards.
	 */
	public static final class New extends WizardParameterValues {
		protected IWizardRegistry getWizardRegistry() {
			return PlatformUI.getWorkbench().getNewWizardRegistry();
		}
	}

	private void addParameterValues(Map values, IWizardCategory wizardCategory) {

		final IWizardDescriptor[] wizardDescriptors = wizardCategory
				.getWizards();
		for (int i = 0; i < wizardDescriptors.length; i++) {
			final IWizardDescriptor wizardDescriptor = wizardDescriptors[i];

			// Note: using description instead of label for the name
			// to reduce possibilities of key collision in the map
			// final String name = wizardDescriptor.getDescription();
			
			// by request
			String name = wizardDescriptor.getLabel();
			final String id = wizardDescriptor.getId();
			final String value = (String) values.get(name);
			if (value!=null && !value.equals(id)) {
				name = name + " (" + id + ")"; //$NON-NLS-1$//$NON-NLS-2$
			}
			values.put(name, id);
		}

		final IWizardCategory[] childCategories = wizardCategory
				.getCategories();
		for (int i = 0; i < childCategories.length; i++) {
			final IWizardCategory childCategory = childCategories[i];
			addParameterValues(values, childCategory);
		}
	}

	public Map getParameterValues() {
		final Map values = new HashMap();

		final IWizardRegistry wizardRegistry = getWizardRegistry();
		addParameterValues(values, wizardRegistry.getRootCategory());

		return values;
	}

	/**
	 * Returns the wizard registry for the concrete
	 * <code>WizardParameterValues</code> implementation class.
	 * 
	 * @return The wizard registry for the concrete
	 *         <code>WizardParameterValues</code> implementation class.
	 */
	protected abstract IWizardRegistry getWizardRegistry();

}