package org.argeo.suite.e4.parts;
   
   import static org.argeo.eclipse.ui.EclipseUiUtils.notEmpty;
   
   import java.util.List;
   
   import javax.annotation.PostConstruct;
   import javax.annotation.PreDestroy;
   import javax.inject.Inject;
  import javax.jcr.NodeIterator;
  import javax.jcr.Repository;
  import javax.jcr.RepositoryException;
  import javax.jcr.Session;
  import javax.jcr.observation.Event;
  import javax.jcr.observation.EventIterator;
  import javax.jcr.observation.EventListener;
  import javax.jcr.query.Query;
  import javax.jcr.query.QueryResult;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.argeo.activities.ActivitiesService;
  import org.argeo.cms.util.CmsUtils;
  import org.argeo.connect.ConnectException;
  import org.argeo.connect.ConnectTypes;
  import org.argeo.connect.resources.ResourcesService;
  import org.argeo.connect.ui.ConnectUiConstants;
  import org.argeo.connect.ui.Refreshable;
  import org.argeo.connect.ui.SystemWorkbenchService;
  import org.argeo.connect.ui.util.BasicNodeListContentProvider;
  import org.argeo.connect.ui.util.JcrViewerDClickListener;
  import org.argeo.connect.ui.widgets.DelayedText;
  import org.argeo.connect.util.ConnectJcrUtils;
  import org.argeo.connect.util.XPathUtils;
  import org.argeo.eclipse.ui.EclipseUiUtils;
  import org.argeo.jcr.JcrUtils;
  import org.argeo.people.PeopleService;
  import org.eclipse.e4.ui.di.Focus;
  import org.eclipse.e4.ui.workbench.modeling.ESelectionService;
  import org.eclipse.jface.layout.TableColumnLayout;
  import org.eclipse.jface.viewers.ColumnWeightData;
  import org.eclipse.jface.viewers.ILabelProvider;
  import org.eclipse.jface.viewers.ISelectionChangedListener;
  import org.eclipse.jface.viewers.IStructuredSelection;
  import org.eclipse.jface.viewers.SelectionChangedEvent;
  import org.eclipse.jface.viewers.StructuredSelection;
  import org.eclipse.jface.viewers.TableViewer;
  import org.eclipse.swt.SWT;
  import org.eclipse.swt.events.KeyEvent;
  import org.eclipse.swt.events.KeyListener;
  import org.eclipse.swt.events.ModifyEvent;
  import org.eclipse.swt.events.ModifyListener;
  import org.eclipse.swt.layout.GridData;
  import org.eclipse.swt.layout.GridLayout;
  import org.eclipse.swt.widgets.Composite;
  import org.eclipse.swt.widgets.Table;
  import org.eclipse.swt.widgets.TableColumn;
  import org.eclipse.swt.widgets.Text;
  
  /** A table with a quick search field. */
  public class QuickSearchView implements Refreshable {
  	private final static Log log = LogFactory.getLog(QuickSearchView.class);
  	// public static final String ID = AsUiPlugin.PLUGIN_ID + ".quickSearchView";
  
  	/* DEPENDENCY INJECTION */
  	@Inject
  	private Repository repository;
  	@Inject
  	private ResourcesService resourcesService;
  	@Inject
  	private ActivitiesService activitiesService;
  	@Inject
  	private PeopleService peopleService;
  	@Inject
  	private SystemWorkbenchService systemWorkbenchService;
  
  	@Inject
  	private ESelectionService selectionService;
  
  	// This page widgets
  	private TableViewer entityViewer;
  	private Text filterTxt;
  
  	private Session session;
  
  	// @Override
  	// public void init(IViewSite site) throws PartInitException {
  	// super.init(site);
  	// }
  
  	@PostConstruct
  	public void createPartControl(Composite parent) {
  		session = ConnectJcrUtils.login(repository);
  		// MainLayout
  		parent.setLayout(new GridLayout());
  		addFilterPanel(parent);
  		entityViewer = createListPart(parent, new EntitySingleColumnLabelProvider(resourcesService, activitiesService,
  				peopleService, systemWorkbenchService));
  		refreshFilteredList();
 
 		try {
 			// new String[] { ConnectTypes.CONNECT_ENTITY }
 			session.getWorkspace().getObservationManager().addEventListener(new EventListener() {
 
 				@Override
 				public void onEvent(EventIterator events) {
 					parent.getDisplay().asyncExec(() -> refreshFilteredList());
 				}
 			}, Event.PROPERTY_CHANGED | Event.NODE_ADDED | Event.NODE_REMOVED | Event.PROPERTY_ADDED, "/", true, null,
 					null, false);
 		} catch (RepositoryException e) {
 			throw new ConnectException("Cannot add JCR observer", e);
 		}
 
 	}
 
 	private void addFilterPanel(Composite parent) {
 		// Use a delayed text: the query won't be done until the user stop
 		// typing for 800ms
 		int style = SWT.BORDER | SWT.SEARCH | SWT.ICON_CANCEL;
 		DelayedText delayedText = new DelayedText(parent, style, ConnectUiConstants.SEARCH_TEXT_DELAY);
 		filterTxt = delayedText.getText();
 		filterTxt.setLayoutData(EclipseUiUtils.fillWidth());
 
 		// final ServerPushSession pushSession = new ServerPushSession();
 		delayedText.addDelayedModifyListener(null, new ModifyListener() {
 			private static final long serialVersionUID = 5003010530960334977L;
 
 			public void modifyText(ModifyEvent event) {
 				delayedText.getText().getDisplay().asyncExec(new Runnable() {
 					@Override
 					public void run() {
 						refreshFilteredList();
 					}
 				});
 				// pushSession.stop();
 			}
 		});
 
 		// Jump to the first item of the list using the down arrow
 		filterTxt.addKeyListener(new KeyListener() {
 			private static final long serialVersionUID = -4523394262771183968L;
 
 			@Override
 			public void keyReleased(KeyEvent e) {
 			}
 
 			@Override
 			public void keyPressed(KeyEvent e) {
 				// boolean shiftPressed = (e.stateMask & SWT.SHIFT) != 0;
 				// boolean altPressed = (e.stateMask & SWT.ALT) != 0;
 				if (e.keyCode == SWT.ARROW_DOWN || e.keyCode == SWT.TAB) {
 					Object first = entityViewer.getElementAt(0);
 					if (first != null) {
 						entityViewer.getTable().setFocus();
 						entityViewer.setSelection(new StructuredSelection(first), true);
 					}
 					e.doit = false;
 				}
 			}
 		});
 	}
 
 	protected TableViewer createListPart(Composite parent, ILabelProvider labelProvider) {
 		parent.setLayout(new GridLayout());
 
 		Composite tableComposite = new Composite(parent, SWT.NONE);
 		GridData gd = new GridData(GridData.HORIZONTAL_ALIGN_FILL | GridData.GRAB_VERTICAL
 				| GridData.VERTICAL_ALIGN_FILL | GridData.GRAB_HORIZONTAL);
 		tableComposite.setLayoutData(gd);
 
 		TableViewer v = new TableViewer(tableComposite);
 		v.setLabelProvider(labelProvider);
 
 		TableColumn singleColumn = new TableColumn(v.getTable(), SWT.V_SCROLL);
 		TableColumnLayout tableColumnLayout = new TableColumnLayout();
 		tableColumnLayout.setColumnData(singleColumn, new ColumnWeightData(85));
 		tableComposite.setLayout(tableColumnLayout);
 
 		// Corresponding table & style
 		Table table = v.getTable();
 		table.setLinesVisible(true);
 		table.setHeaderVisible(false);
 		CmsUtils.markup(table);
 		CmsUtils.setItemHeight(table, 26);
 
 		v.setContentProvider(new BasicNodeListContentProvider());
 		v.addDoubleClickListener(new JcrViewerDClickListener(systemWorkbenchService));
 		v.addSelectionChangedListener(new ISelectionChangedListener() {
 			public void selectionChanged(SelectionChangedEvent event) {
 				IStructuredSelection selection = (IStructuredSelection) event.getSelection();
 				List<?> lst = selection.toList();
 				if (lst != null && !lst.isEmpty())
 					selectionService.setSelection(selection.toList());
 				else
 					selectionService.setSelection(null);
 			}
 		});
 		return v;
 	}
 
 	@PreDestroy
 	public void dispose() {
 		JcrUtils.logoutQuietly(session);
 	}
 
 	@Focus
 	public void setFocus() {
 		refreshFilteredList();
 		filterTxt.setFocus();
 	}
 
 	@Override
 	public void forceRefresh(Object object) {
 		refreshFilteredList();
 	}
 
 	protected void refreshFilteredList() {
 		try {
 			String filter = filterTxt.getText();
 			// Prevents the query on the full repository
 			// if (isEmpty(filter)) {
 			// entityViewer.setInput(null);
 			// return;
 			// }
 
 			// XPATH Query
 			String xpathQueryStr = "//element(*, " + ConnectTypes.CONNECT_ENTITY + ")";
 			String xpathFilter = XPathUtils.getFreeTextConstraint(filter);
 			if (notEmpty(xpathFilter))
 				xpathQueryStr += "[" + xpathFilter + "]";
 
 			// boolean doOrder = orderResultsBtn != null
 			// && !(orderResultsBtn.isDisposed())
 			// && orderResultsBtn.getSelection();
 			// if (doOrder) {
 			// xpathQueryStr += " order by jcr:title";
 			// }
 
 			long begin = System.currentTimeMillis();
 			// session.refresh(false);
 			Query xpathQuery = XPathUtils.createQuery(session, xpathQueryStr);
 
 			xpathQuery.setLimit(ConnectUiConstants.SEARCH_DEFAULT_LIMIT);
 			QueryResult result = xpathQuery.execute();
 
 			NodeIterator nit = result.getNodes();
 			entityViewer.setInput(JcrUtils.nodeIteratorToList(nit));
 			if (log.isTraceEnabled()) {
 				long end = System.currentTimeMillis();
 				log.trace("Quick Search - Found: " + nit.getSize() + " in " + (end - begin)
 						+ " ms by executing XPath query (" + xpathQueryStr + ").");
 			}
 		} catch (RepositoryException e) {
 			throw new ConnectException("Unable to list entities", e);
 		}
 	}
 
 	// public void setRepository(Repository repository) {
 	// this.repository = repository;
 	// }
 	//
 	// public void setResourcesService(ResourcesService resourcesService) {
 	// this.resourcesService = resourcesService;
 	// }
 	//
 	// public void setActivitiesService(ActivitiesService activitiesService) {
 	// this.activitiesService = activitiesService;
 	// }
 	//
 	// public void setPeopleService(PeopleService peopleService) {
 	// this.peopleService = peopleService;
 	// }
 	//
 	// public void setSystemWorkbenchService(SystemWorkbenchService
 	// systemWorkbenchService) {
 	// this.systemWorkbenchService = systemWorkbenchService;
 	// }
 }