/*
    * 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.e4.users;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import javax.annotation.PostConstruct;
  import javax.annotation.PreDestroy;
  import javax.inject.Inject;
  
  import org.argeo.api.NodeConstants;
  import org.argeo.cms.CmsException;
  import org.argeo.cms.auth.CurrentUser;
  import org.argeo.cms.e4.users.providers.CommonNameLP;
  import org.argeo.cms.e4.users.providers.DomainNameLP;
  import org.argeo.cms.e4.users.providers.MailLP;
  import org.argeo.cms.e4.users.providers.UserDragListener;
  import org.argeo.cms.e4.users.providers.UserNameLP;
  import org.argeo.eclipse.ui.ColumnDefinition;
  import org.argeo.eclipse.ui.EclipseUiUtils;
  import org.argeo.eclipse.ui.parts.LdifUsersTable;
  import org.argeo.naming.LdapAttrs;
  import org.argeo.naming.LdapObjs;
  import org.eclipse.e4.ui.di.Focus;
  import org.eclipse.e4.ui.workbench.modeling.EPartService;
  import org.eclipse.e4.ui.workbench.modeling.ESelectionService;
  import org.eclipse.jface.viewers.ISelectionChangedListener;
  import org.eclipse.jface.viewers.IStructuredSelection;
  import org.eclipse.jface.viewers.SelectionChangedEvent;
  import org.eclipse.jface.viewers.TableViewer;
  import org.eclipse.swt.SWT;
  import org.eclipse.swt.dnd.DND;
  import org.eclipse.swt.dnd.TextTransfer;
  import org.eclipse.swt.dnd.Transfer;
  import org.eclipse.swt.widgets.Composite;
  import org.eclipse.swt.widgets.Display;
  import org.osgi.framework.InvalidSyntaxException;
  import org.osgi.service.useradmin.Role;
  import org.osgi.service.useradmin.User;
  import org.osgi.service.useradmin.UserAdminEvent;
  import org.osgi.service.useradmin.UserAdminListener;
  
  /** List all users with filter - based on Ldif userAdmin */
  public class UsersView {
  	// private final static Log log = LogFactory.getLog(UsersView.class);
  
  	// public final static String ID = WorkbenchUiPlugin.PLUGIN_ID + ".usersView";
  
  	@Inject
  	private UserAdminWrapper userAdminWrapper;
  	@Inject
  	private EPartService partService;
  
  	// UI Objects
  	private LdifUsersTable userTableViewerCmp;
  	private TableViewer userViewer;
  	private List<ColumnDefinition> columnDefs = new ArrayList<ColumnDefinition>();
  
  	private UserAdminListener listener;
  
  	@PostConstruct
  	public void createPartControl(Composite parent, ESelectionService selectionService) {
  
  		parent.setLayout(EclipseUiUtils.noSpaceGridLayout());
  		// Define the displayed columns
  		columnDefs.add(new ColumnDefinition(new CommonNameLP(), "Common Name", 150));
  		columnDefs.add(new ColumnDefinition(new MailLP(), "E-mail", 150));
  		columnDefs.add(new ColumnDefinition(new DomainNameLP(), "Domain", 200));
  		// Only show technical DN to admin
  		if (CurrentUser.isInRole(NodeConstants.ROLE_ADMIN))
  			columnDefs.add(new ColumnDefinition(new UserNameLP(), "Distinguished Name", 300));
  
  		// Create and configure the table
  		userTableViewerCmp = new MyUserTableViewer(parent, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL);
  		userTableViewerCmp.setLayoutData(EclipseUiUtils.fillAll());
  		userTableViewerCmp.setColumnDefinitions(columnDefs);
  		userTableViewerCmp.populate(true, false);
  
  		// Links
  		userViewer = userTableViewerCmp.getTableViewer();
  		userViewer.addDoubleClickListener(new UserTableDefaultDClickListener(partService));
  		userViewer.addSelectionChangedListener(new ISelectionChangedListener() {
  
  			@Override
  			public void selectionChanged(SelectionChangedEvent event) {
 				IStructuredSelection selection = (IStructuredSelection) event.getSelection();
 				selectionService.setSelection(selection.toList());
 			}
 		});
 		// getViewSite().setSelectionProvider(userViewer);
 
 		// Really?
 		userTableViewerCmp.refresh();
 
 		// Drag and drop
 		int operations = DND.DROP_COPY | DND.DROP_MOVE;
 		Transfer[] tt = new Transfer[] { TextTransfer.getInstance() };
 		userViewer.addDragSupport(operations, tt, new UserDragListener(userViewer));
 
 		// Register a useradmin listener
 		listener = new MyUiUAListener(parent.getDisplay());
 		userAdminWrapper.addListener(listener);
 	}
 
 	private class MyUiUAListener extends UiUserAdminListener {
 		public MyUiUAListener(Display display) {
 			super(display);
 		}
 
 		@Override
 		public void roleChangedToUiThread(UserAdminEvent event) {
 			if (userViewer != null && !userViewer.getTable().isDisposed())
 				refresh();
 		}
 	}
 
 	private class MyUserTableViewer extends LdifUsersTable {
 		private static final long serialVersionUID = 8467999509931900367L;
 
 		private final String[] knownProps = { LdapAttrs.DN, LdapAttrs.uid.name(), LdapAttrs.cn.name(),
 				LdapAttrs.givenName.name(), LdapAttrs.sn.name(), LdapAttrs.mail.name() };
 
 		public MyUserTableViewer(Composite parent, int style) {
 			super(parent, style);
 		}
 
 		@Override
 		protected List<User> listFilteredElements(String filter) {
 			Role[] roles;
 
 			try {
 				StringBuilder builder = new StringBuilder();
 
 				StringBuilder tmpBuilder = new StringBuilder();
 				if (EclipseUiUtils.notEmpty(filter))
 					for (String prop : knownProps) {
 						tmpBuilder.append("(");
 						tmpBuilder.append(prop);
 						tmpBuilder.append("=*");
 						tmpBuilder.append(filter);
 						tmpBuilder.append("*)");
 					}
 				if (tmpBuilder.length() > 1) {
 					builder.append("(&(").append(LdapAttrs.objectClass.name()).append("=")
 							.append(LdapObjs.inetOrgPerson.name()).append(")(|");
 					builder.append(tmpBuilder.toString());
 					builder.append("))");
 				} else
 					builder.append("(").append(LdapAttrs.objectClass.name()).append("=")
 							.append(LdapObjs.inetOrgPerson.name()).append(")");
 				roles = userAdminWrapper.getUserAdmin().getRoles(builder.toString());
 			} catch (InvalidSyntaxException e) {
 				throw new CmsException("Unable to get roles with filter: " + filter, e);
 			}
 			List<User> users = new ArrayList<User>();
 			for (Role role : roles)
 				// if (role.getType() == Role.USER && role.getType() !=
 				// Role.GROUP)
 				users.add((User) role);
 			return users;
 		}
 	}
 
 	public void refresh() {
 		userTableViewerCmp.refresh();
 	}
 
 	// Override generic view methods
 	@PreDestroy
 	public void dispose() {
 		userAdminWrapper.removeListener(listener);
 	}
 
 	@Focus
 	public void setFocus() {
 		userTableViewerCmp.setFocus();
 	}
 
 	/* DEPENDENCY INJECTION */
 	public void setUserAdminWrapper(UserAdminWrapper userAdminWrapper) {
 		this.userAdminWrapper = userAdminWrapper;
 	}
 }