/*
    * Copyright (C) 2007-2012 Argeo GmbH
    *
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    *         http://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.argeo.slc.client.ui.dist.commands;
  
  import javax.jcr.Node;
  import javax.jcr.Repository;
  import javax.jcr.RepositoryException;
  import javax.jcr.Session;
  import javax.jcr.security.Privilege;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.argeo.cms.ui.workbench.util.PrivilegedJob;
  import org.argeo.eclipse.ui.EclipseJcrMonitor;
  import org.argeo.jcr.JcrMonitor;
  import org.argeo.jcr.JcrUtils;
  import org.argeo.slc.SlcConstants;
  import org.argeo.slc.SlcException;
  import org.argeo.slc.client.ui.dist.DistPlugin;
  import org.argeo.slc.client.ui.dist.utils.CommandHelpers;
  import org.argeo.slc.repo.JavaRepoManager;
  import org.argeo.slc.repo.RepoUtils;
  import org.eclipse.core.commands.AbstractHandler;
  import org.eclipse.core.commands.ExecutionEvent;
  import org.eclipse.core.commands.ExecutionException;
  import org.eclipse.core.runtime.IProgressMonitor;
  import org.eclipse.core.runtime.IStatus;
  import org.eclipse.core.runtime.Status;
  import org.eclipse.core.runtime.jobs.Job;
  import org.eclipse.jface.dialogs.ErrorDialog;
  import org.eclipse.jface.dialogs.InputDialog;
  import org.eclipse.jface.resource.ImageDescriptor;
  import org.eclipse.jface.window.Window;
  import org.eclipse.swt.widgets.Display;
  import org.eclipse.ui.handlers.HandlerUtil;
  
  /**
   * Create a copy of the chosen workspace in the local Java repository using a
   * JavaRepoManager.
   */
  public class CopyLocalJavaWorkspace extends AbstractHandler {
  	private static final Log log = LogFactory
  			.getLog(CopyLocalJavaWorkspace.class);
  
  	public final static String ID = DistPlugin.PLUGIN_ID + ".copyLocalJavaWorkspace";
  	public final static String DEFAULT_LABEL = "Copy Java Workspace...";
  	public final static ImageDescriptor DEFAULT_ICON = DistPlugin
  			.getImageDescriptor("icons/addItem.gif");
  
  	public final static String PARAM_SOURCE_WORKSPACE_NAME = "srcWkspName";
  
  	// DEPENDENCY INJECTION
  	private Repository javaRepository;
  	private JavaRepoManager javaRepoManager;
  
  	public Object execute(ExecutionEvent event) throws ExecutionException {
  		String wkspName = event.getParameter(PARAM_SOURCE_WORKSPACE_NAME);
  
  		InputDialog inputDialog = new InputDialog(HandlerUtil
  				.getActiveWorkbenchWindow(event).getShell(),
  				"New copy of workspace " + wkspName,
  				"Choose a name for the workspace to create", "", null);
  		int result = inputDialog.open();
  		if (result == Window.OK) {
  			String newWorkspaceName = inputDialog.getValue();
  
  			if (newWorkspaceName == null || newWorkspaceName.trim().equals("")
  					|| newWorkspaceName.trim().equals(wkspName.trim())) {
  				ErrorDialog
  						.openError(HandlerUtil.getActiveShell(event),
  								"Non valid workspace name", newWorkspaceName
  										+ " is not a valid workspace name.",
  								new Status(IStatus.ERROR, "not valid", 0,
  										"Error", null));
  				return null;
  			}
  			Job copyWkspJob = new CopyWkspJob(javaRepoManager, javaRepository,
  					wkspName, newWorkspaceName, HandlerUtil
  							.getActiveWorkbenchWindow(event).getShell()
  							.getDisplay());
  			copyWkspJob.setUser(true);
  			copyWkspJob.schedule();
  		}
  		return null;
  	}
  
 	private static class CopyWkspJob extends PrivilegedJob {
 
 		private JavaRepoManager javaRepoManager;
 		private Repository javaRepository;
 		private String srcWkspName;
 		private String targetWkspName;
 		private Display display;
 
 		public CopyWkspJob(JavaRepoManager javaRepoManager,
 				Repository javaRepository, String srcWkspName,
 				String targetWkspName, Display display) {
 			super("Duplicate workspace");
 			this.javaRepoManager = javaRepoManager;
 			this.javaRepository = javaRepository;
 			this.srcWkspName = srcWkspName;
 			this.targetWkspName = targetWkspName;
 			this.display = display;
 		}
 
 		@Override
 		protected IStatus doRun(IProgressMonitor progressMonitor) {
 			long begin = System.currentTimeMillis();
 
 			JcrMonitor monitor = new EclipseJcrMonitor(progressMonitor);
 			monitor.beginTask("Copy workspace", -1);
 			monitor.subTask("Copying nodes");
 
 			Session srcSession = null;
 			Session targetSession = null;
 			try {
 				// Initialize source
 				srcSession = javaRepository.login(srcWkspName);
 				Node srcRootNode = srcSession.getRootNode();
 
 				// Create the workspace -
 				// FIXME will throw an error if workspace already exists
 				javaRepoManager.createWorkspace(targetWkspName);
 				targetSession = javaRepository.login(targetWkspName);
 				Node newRootNode = targetSession.getRootNode();
 
 				RepoUtils.copy(srcRootNode, newRootNode, monitor);
 				targetSession.save();
 				JcrUtils.addPrivilege(targetSession, "/",
 						SlcConstants.ROLE_SLC, Privilege.JCR_ALL);
 				monitor.worked(1);
 
 				display.asyncExec(new Runnable() {
 					public void run() {
 						CommandHelpers.callCommand(RefreshDistributionsView.ID);
 					}
 				});
 
 			} catch (RepositoryException re) {
 				throw new SlcException(
 						"Unexpected error while creating the new workspace.",
 						re);
 			} finally {
 				JcrUtils.logoutQuietly(srcSession);
 				JcrUtils.logoutQuietly(targetSession);
 			}
 
 			monitor.done();
 			long duration = (System.currentTimeMillis() - begin) / 1000;// in
 																		// s
 			if (log.isDebugEnabled())
 				log.debug("Duplicated local java workspace " + srcWkspName
 						+ " to workspace " + targetWkspName + " in "
 						+ (duration / 60) + "min " + (duration % 60) + "s");
 			return Status.OK_STATUS;
 		}
 	}
 
 	/* DEPENDENCY INJECTION */
 	public void setJavaRepository(Repository javaRepository) {
 		this.javaRepository = javaRepository;
 	}
 
 	public void setJavaRepoManager(JavaRepoManager javaRepoManager) {
 		this.javaRepoManager = javaRepoManager;
 	}
 }