/*******************************************************************************
 * Copyright (c) 2000, 2010 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.mylyn.internal.commons.repositories.ui.wizards;

import java.util.StringTokenizer;

import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.wizard.IWizard;
import org.eclipse.jface.wizard.Wizard;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.internal.IWorkbenchGraphicConstants;
import org.eclipse.ui.internal.WorkbenchImages;
import org.eclipse.ui.internal.WorkbenchMessages;
import org.eclipse.ui.wizards.IWizardCategory;
import org.eclipse.ui.wizards.IWizardDescriptor;

/**
 * The new wizard is responsible for allowing the user to choose which new (nested) wizard to run. The set of available
 * new wizards comes from the new extension point.
 */
@SuppressWarnings("restriction")
public class NewRepositoryWizard extends Wizard {

	private static final String CATEGORY_SEPARATOR = "/"; //$NON-NLS-1$

	private String categoryId = null;

	private NewRepositoryWizardSelectionPage mainPage;

	private boolean projectsOnly = false;

	private IStructuredSelection selection;

	private IWorkbench workbench;

	/**
	 * Create the wizard pages
	 */
	@Override
	public void addPages() {
		IWizardCategory root = NewRepositoryWizardRegistry.getInstance().getRootCategory();
		IWizardDescriptor[] primary = NewRepositoryWizardRegistry.getInstance().getPrimaryWizards();

		if (categoryId != null) {
			IWizardCategory categories = root;
			StringTokenizer familyTokenizer = new StringTokenizer(categoryId, CATEGORY_SEPARATOR);
			while (familyTokenizer.hasMoreElements()) {
				categories = getChildWithID(categories, familyTokenizer.nextToken());
				if (categories == null) {
					break;
				}
			}
			if (categories != null) {
				root = categories;
			}
		}

		mainPage = new NewRepositoryWizardSelectionPage(workbench, selection, root, primary, projectsOnly);
		addPage(mainPage);
	}

	/**
	 * Returns the id of the category of wizards to show or <code>null</code> to show all categories. If no entries can
	 * be found with this id then all categories are shown.
	 * 
	 * @return String or <code>null</code>.
	 */
	public String getCategoryId() {
		return categoryId;
	}

	/**
	 * Returns the child collection element for the given id
	 */
	private IWizardCategory getChildWithID(IWizardCategory parent, String id) {
		IWizardCategory[] children = parent.getCategories();
		for (IWizardCategory currentChild : children) {
			if (currentChild.getId().equals(id)) {
				return currentChild;
			}
		}
		return null;
	}

	/**
	 * Lazily create the wizards pages
	 * 
	 * @param aWorkbench
	 *            the workbench
	 * @param currentSelection
	 *            the current selection
	 */
	public void init(IWorkbench aWorkbench, IStructuredSelection currentSelection) {
		this.workbench = aWorkbench;
		this.selection = currentSelection;

		if (getWindowTitle() == null) {
			// No title supplied. Set the default title
			if (projectsOnly) {
				setWindowTitle(WorkbenchMessages.NewProject_title);
			} else {
				setWindowTitle(WorkbenchMessages.NewWizard_title);
			}
		}
		setDefaultPageImageDescriptor(WorkbenchImages.getImageDescriptor(IWorkbenchGraphicConstants.IMG_WIZBAN_NEW_WIZ));
		setNeedsProgressMonitor(true);
	}

	/**
	 * The user has pressed Finish. Instruct self's pages to finish, and answer a boolean indicating success.
	 * 
	 * @return boolean
	 */
	@Override
	public boolean performFinish() {
		//save our selection state
		mainPage.saveWidgetValues();
		// if we're finishing from the main page then perform finish on the selected wizard.
		if (getContainer().getCurrentPage() == mainPage) {
			if (mainPage.canFinishEarly()) {
				IWizard wizard = mainPage.getSelectedNode().getWizard();
				wizard.setContainer(getContainer());
				return wizard.performFinish();
			}
		}
		return true;
	}

	/**
	 * Sets the id of the category of wizards to show or <code>null</code> to show all categories. If no entries can be
	 * found with this id then all categories are shown.
	 * 
	 * @param id
	 *            may be <code>null</code>.
	 */
	public void setCategoryId(String id) {
		categoryId = id;
	}

	/**
	 * Sets the projects only flag. If <code>true</code> only projects will be shown in this wizard.
	 * 
	 * @param b
	 *            if only projects should be shown
	 */
	public void setProjectsOnly(boolean b) {
		projectsOnly = b;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.jface.wizard.IWizard#canFinish()
	 */
	@Override
	public boolean canFinish() {
		// we can finish if the first page is current and the the page can finish early.
		if (getContainer().getCurrentPage() == mainPage) {
			if (mainPage.canFinishEarly()) {
				return true;
			}
		}
		return super.canFinish();
	}

}
