/*******************************************************************************
 * 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.ide.dialogs;

import java.lang.reflect.InvocationTargetException;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IProjectDescription;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IResourceStatus;
import org.eclipse.core.resources.IWorkspace;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.OperationCanceledException;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.SubProgressMonitor;
import org.eclipse.jface.dialogs.ErrorDialog;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.wizard.Wizard;
import org.eclipse.osgi.util.NLS;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.actions.WorkspaceModifyOperation;
import org.eclipse.ui.internal.ide.IDEWorkbenchMessages;
import org.eclipse.ui.internal.ide.IDEWorkbenchPlugin;

/**
 * Internal workbench wizard to create a project
 * resource in the workspace. This project will have
 * no capabilities when created. This wizard is intended
 * to be used by the CreateProjectStep class only.
 */
public class CreateProjectWizard extends Wizard {
    private NewProjectWizard wizard;

    private WizardNewProjectNameAndLocationPage page;

    /**
     * Creates an empty wizard for creating a new project
     * in the workspace.
     */
    /* package */CreateProjectWizard(WizardNewProjectNameAndLocationPage page,
            NewProjectWizard wizard) {
        super();
        this.page = page;
        this.wizard = wizard;
    }

    /**
     * Creates a new project resource with the entered name.
     *
     * @return the created project resource, or <code>null</code> if the project
     *    was not created
     */
    private IProject createNewProject() {
        // get a project handle
        final IProject newProjectHandle = page.getProjectHandle();

        // get a project descriptor
        IPath defaultPath = Platform.getLocation();
        IPath newPath = page.getLocationPath();
        if (defaultPath.equals(newPath))
            newPath = null;
        IWorkspace workspace = ResourcesPlugin.getWorkspace();
        final IProjectDescription description = workspace
                .newProjectDescription(newProjectHandle.getName());
        description.setLocation(newPath);

        // define the operation to create a new project
        WorkspaceModifyOperation op = new WorkspaceModifyOperation() {
            protected void execute(IProgressMonitor monitor)
                    throws CoreException {
                createProject(description, newProjectHandle, monitor);
            }
        };

        // run the operation to create a new project
        try {
            getContainer().run(true, true, op);
        } catch (InterruptedException e) {
            return null;
        } catch (InvocationTargetException e) {
            Throwable t = e.getTargetException();
            if (t instanceof CoreException) {
                if (((CoreException) t).getStatus().getCode() == IResourceStatus.CASE_VARIANT_EXISTS) {
                    MessageDialog
                            .openError(
                                    getShell(),
                                    IDEWorkbenchMessages.CreateProjectWizard_errorTitle,
                                    IDEWorkbenchMessages.CreateProjectWizard_caseVariantExistsError
                            );
                } else {
                    ErrorDialog.openError(getShell(), IDEWorkbenchMessages.CreateProjectWizard_errorTitle,
                            null, // no special message
                            ((CoreException) t).getStatus());
                }
            } else {
                // Unexpected runtime exceptions and errors may still occur.
            	 IDEWorkbenchPlugin.getDefault().getLog().log(
                        new Status(IStatus.ERROR, PlatformUI.PLUGIN_ID, 0, t
                                .toString(), t));
                MessageDialog
                        .openError(
                                getShell(),
                                IDEWorkbenchMessages.CreateProjectWizard_errorTitle,
                                NLS.bind(IDEWorkbenchMessages.CreateProjectWizard_internalError, t.getMessage()));
            }
            return null;
        }

        return newProjectHandle;
    }

    /**
     * Creates a project resource given the project handle and description.
     *
     * @param description the project description to create a project resource for
     * @param projectHandle the project handle to create a project resource for
     * @param monitor the progress monitor to show visual progress with
     *
     * @exception CoreException if the operation fails
     * @exception OperationCanceledException if the operation is canceled
     */
    private void createProject(IProjectDescription description,
            IProject projectHandle, IProgressMonitor monitor)
            throws CoreException, OperationCanceledException {
        try {
            monitor.beginTask("", 2000); //$NON-NLS-1$

            projectHandle.create(description, new SubProgressMonitor(monitor,
                    1000));

            if (monitor.isCanceled())
                throw new OperationCanceledException();

            projectHandle.open(IResource.BACKGROUND_REFRESH, new SubProgressMonitor(monitor, 1000));

        } finally {
            monitor.done();
        }
    }

    /**
     * Returns the current project name.
     *
     * @return the project name or <code>null</code>
     *   if no project name is known
     */
    /* package */String getProjectName() {
        return page.getProjectName();
    }

    /* (non-Javadoc)
     * Method declared on IWizard.
     */
    public boolean performFinish() {
        if (wizard.getNewProject() != null)
            return true;

        IProject project = createNewProject();
        if (project != null) {
            wizard.setNewProject(project);
            return true;
        } else {
            return false;
        }
    }
}