/*******************************************************************************
 * 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.actions;

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.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.MultiStatus;
import org.eclipse.core.runtime.OperationCanceledException;
import org.eclipse.core.runtime.Path;
import org.eclipse.core.runtime.Platform;
import org.eclipse.jface.dialogs.ErrorDialog;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.window.Window;
import org.eclipse.osgi.util.NLS;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.dialogs.ProjectLocationSelectionDialog;
import org.eclipse.ui.internal.ide.IDEWorkbenchMessages;
import org.eclipse.ui.internal.progress.ProgressMonitorJobsDialog;

/**
 * Implementation class to perform the actual copying of project resources from the clipboard 
 * when paste action is invoked.
 * <p>
 * This class may be instantiated; it is not intended to be subclassed.
 * </p>
 */
public class CopyProjectOperation {

    /**
     * Status containing the errors detected when running the operation or
     * <code>null</code> if no errors detected.
     */
    private MultiStatus errorStatus;

    /**
     * The parent shell used to show any dialogs.
     */
    private Shell parentShell;

    /** 
     * Create a new operation initialized with a shell. 
     * 
     * @param shell parent shell for error dialogs
     */
    public CopyProjectOperation(Shell shell) {
        parentShell = shell;
    }

    /**
     * Paste a copy of the project on the clipboard to the workspace.
     * @param project The project that is beign copied.
     */
    public void copyProject(IProject project) {
        errorStatus = null;

        //Get the project name and location in a two element list
        ProjectLocationSelectionDialog dialog = new ProjectLocationSelectionDialog(
                parentShell, project);
        dialog.setTitle(IDEWorkbenchMessages.CopyProjectOperation_copyProject);
        if (dialog.open() != Window.OK)
            return;

        Object[] destinationPaths = dialog.getResult();
        if (destinationPaths == null)
            return;

        String newName = (String) destinationPaths[0];
        IPath newLocation = new Path((String) destinationPaths[1]);

        boolean completed = performProjectCopy(project, newName, newLocation);

        if (!completed) // ie.- canceled
            return; // not appropriate to show errors

        // If errors occurred, open an Error dialog
        if (errorStatus != null) {
            ErrorDialog.openError(parentShell, IDEWorkbenchMessages.CopyProjectOperation_copyFailedTitle,
                    null, errorStatus);
            errorStatus = null;
        }
    }

    /**
     * Copies the project to the new values.
     *
     * @param project the project to copy
     * @param projectName the name of the copy
     * @param newLocation IPath
     * @return <code>true</code> if the copy operation completed, and 
     *   <code>false</code> if it was abandoned part way
     */
    private boolean performProjectCopy(final IProject project,
            final String projectName, final IPath newLocation) {
        WorkspaceModifyOperation op = new WorkspaceModifyOperation() {
            public void execute(IProgressMonitor monitor) {
                try {
                    if (monitor.isCanceled())
                        throw new OperationCanceledException();
                    
                    monitor.setTaskName(IDEWorkbenchMessages.CopyProjectOperation_progressTitle);
                    
                    //Get a copy of the current description and modify it
                    IProjectDescription newDescription = createProjectDescription(
                            project, projectName, newLocation);
                    project.copy(newDescription, IResource.SHALLOW
                            | IResource.FORCE, monitor);
                } catch (CoreException e) {
                    recordError(e); // log error
                }
            }
        };

        try {
            new ProgressMonitorJobsDialog(parentShell).run(true, true, op);
        } catch (InterruptedException e) {
            return false;
        } catch (InvocationTargetException e) {
            final String message = e.getTargetException().getMessage();
            parentShell.getDisplay().syncExec(new Runnable() {
                public void run() {
                    MessageDialog.openError(parentShell, IDEWorkbenchMessages.CopyProjectOperation_copyFailedTitle,
                            NLS.bind(IDEWorkbenchMessages.CopyProjectOperation_internalError, message));
                }
            });
            return false;
        }

        return true;
    }

    /**
     * Create a new IProjectDescription for the copy using the auto-generated
     * name and path.
     * 
     * @return IProjectDescription
     * @param project the source project
     * @param projectName the name for the new project
     * @param rootLocation the path the new project will be stored under.
     * @throws CoreException
     */
    private IProjectDescription createProjectDescription(IProject project,
            String projectName, IPath rootLocation) throws CoreException {
        //Get a copy of the current description and modify it
        IProjectDescription newDescription = project.getDescription();
        newDescription.setName(projectName);

        //If the location is the default then set the location to null
        if (rootLocation.equals(Platform.getLocation()))
            newDescription.setLocation(null);
        else
            newDescription.setLocation(rootLocation);

        return newDescription;
    }

    /**
     * Records the core exception to be displayed to the user
     * once the action is finished.
     *
     * @param error a <code>CoreException</code>
     */
    private void recordError(CoreException error) {

        if (errorStatus == null)
            errorStatus = new MultiStatus(
                    PlatformUI.PLUGIN_ID,
                    IStatus.ERROR,
                    IDEWorkbenchMessages.CopyProjectOperation_copyFailedMessage,
                    error);

        errorStatus.merge(error.getStatus());
    }
}