/*******************************************************************************
 * Copyright (c) 2000, 2005 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.dialogs;

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.internal.WorkbenchPlugin;
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.
 */
public class NewWizard extends Wizard {
    private static final String CATEGORY_SEPARATOR = "/"; //$NON-NLS-1$

    private String categoryId = null;

    private NewWizardSelectionPage mainPage;

    private boolean projectsOnly = false;

    private IStructuredSelection selection;

    private IWorkbench workbench;

    /**
     * Create the wizard pages
     */
    public void addPages() {
        IWizardCategory root = WorkbenchPlugin.getDefault().getNewWizardRegistry().getRootCategory();
        IWizardDescriptor [] primary = WorkbenchPlugin.getDefault().getNewWizardRegistry().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 NewWizardSelectionPage(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 (int i = 0; i < children.length; ++i) {
        	IWizardCategory currentChild = children[i];
            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 (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
     */
    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()
     */
    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();
    }
}