/*
    * 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.cms.ui.workbench.internal.jcr.commands;
  
  import static org.argeo.eclipse.ui.utils.SingleSourcingConstants.FILE_SCHEME;
  import static org.argeo.eclipse.ui.utils.SingleSourcingConstants.SCHEME_HOST_SEPARATOR;
  
  import java.io.File;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.text.DateFormat;
  import java.text.SimpleDateFormat;
  import java.util.GregorianCalendar;
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.Map;
  
  import javax.jcr.Node;
  import javax.jcr.RepositoryException;
  
  import org.argeo.cms.ui.jcr.model.SingleJcrNodeElem;
  import org.argeo.cms.ui.workbench.WorkbenchUiPlugin;
  import org.argeo.cms.ui.workbench.util.CommandUtils;
  import org.argeo.eclipse.ui.EclipseUiException;
  import org.argeo.eclipse.ui.specific.OpenFile;
  import org.argeo.jcr.JcrUtils;
  import org.eclipse.core.commands.AbstractHandler;
  import org.eclipse.core.commands.ExecutionEvent;
  import org.eclipse.core.commands.ExecutionException;
  import org.eclipse.jface.viewers.ISelection;
  import org.eclipse.jface.viewers.IStructuredSelection;
  import org.eclipse.ui.handlers.HandlerUtil;
  
  /**
   * Canonically call JCR Session#exportSystemView() on the first element returned
   * by HandlerUtil#getActiveWorkbenchWindow()
   * (...getActivePage().getSelection()), if it is a {@link SingleJcrNodeElem},
   * with both skipBinary and noRecurse boolean flags set to false.
   * 
   * Resulting stream is saved in a tmp file and opened via the {@link OpenFile}
   * single-sourced command.
   */
  public class DumpNode extends AbstractHandler {
  	public final static String ID = WorkbenchUiPlugin.PLUGIN_ID + ".dumpNode";
  
  	private final static DateFormat df = new SimpleDateFormat("yyyy-MM-dd_HH-mm");
  
  	public Object execute(ExecutionEvent event) throws ExecutionException {
  		ISelection selection = HandlerUtil.getActiveWorkbenchWindow(event).getActivePage().getSelection();
  		if (selection == null || !(selection instanceof IStructuredSelection))
  			return null;
  
  		Iterator<?> lst = ((IStructuredSelection) selection).iterator();
  		if (lst.hasNext()) {
  			Object element = lst.next();
  			if (element instanceof SingleJcrNodeElem) {
  				SingleJcrNodeElem sjn = (SingleJcrNodeElem) element;
  				Node node = sjn.getNode();
  
  				// TODO add a dialog to configure the export and ask for
  				// confirmation
  				// Boolean ok = MessageDialog.openConfirm(
  				// HandlerUtil.getActiveShell(event), "Confirm dump",
  				// "Do you want to dump " + buf + "?");
  
  				File tmpFile;
  				FileOutputStream fos;
  				try {
  					tmpFile = File.createTempFile("JcrExport", ".xml");
  					tmpFile.deleteOnExit();
  					fos = new FileOutputStream(tmpFile);
  					String dateVal = df.format(new GregorianCalendar().getTime());
  					node.getSession().exportSystemView(node.getPath(), fos, true, false);
  					openGeneratedFile(tmpFile.getAbsolutePath(),
  							"Dump-" + JcrUtils.replaceInvalidChars(node.getName()) + "-" + dateVal + ".xml");
  				} catch (RepositoryException e) {
  					throw new EclipseUiException("Unable to perform SystemExport on " + node, e);
  				} catch (IOException e) {
  					throw new EclipseUiException("Unable to SystemExport " + node, e);
  				}
  			}
  		}
  		return null;
  	}
  
  	private synchronized void openGeneratedFile(String path, String fileName) {
 		Map<String, String> params = new HashMap<String, String>();
 		params.put(OpenFile.PARAM_FILE_NAME, fileName);
 		params.put(OpenFile.PARAM_FILE_URI, FILE_SCHEME + SCHEME_HOST_SEPARATOR + path);
 		CommandUtils.callCommand(OpenFile.ID, params);
 	}
 }