package org.argeo.cms.e4.users;

import static org.argeo.api.NodeInstance.WORKGROUP;
import static org.argeo.cms.auth.UserAdminUtils.setProperty;
import static org.argeo.naming.LdapAttrs.businessCategory;
import static org.argeo.naming.LdapAttrs.description;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import javax.annotation.PreDestroy;
import javax.inject.Inject;
import javax.jcr.Node;
import javax.jcr.Repository;
import javax.jcr.RepositoryException;
import javax.jcr.Session;
import javax.naming.InvalidNameException;
import javax.naming.ldap.LdapName;

import org.argeo.api.NodeConstants;
import org.argeo.api.NodeInstance;
import org.argeo.api.NodeUtils;
import org.argeo.cms.CmsException;
import org.argeo.cms.auth.UserAdminUtils;
import org.argeo.cms.e4.users.providers.CommonNameLP;
import org.argeo.cms.e4.users.providers.MailLP;
import org.argeo.cms.e4.users.providers.RoleIconLP;
import org.argeo.cms.e4.users.providers.UserFilter;
import org.argeo.cms.ui.eclipse.forms.AbstractFormPart;
import org.argeo.cms.ui.eclipse.forms.IManagedForm;
import org.argeo.cms.ui.util.CmsUiUtils;
import org.argeo.eclipse.ui.ColumnDefinition;
import org.argeo.eclipse.ui.EclipseUiUtils;
import org.argeo.eclipse.ui.parts.LdifUsersTable;
import org.argeo.jcr.JcrUtils;
import org.argeo.naming.LdapAttrs;
import org.argeo.osgi.transaction.WorkTransaction;
import org.eclipse.e4.ui.workbench.modeling.EPartService;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.action.ToolBarManager;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.ViewerDropAdapter;
import org.eclipse.swt.SWT;
import org.eclipse.swt.dnd.DND;
import org.eclipse.swt.dnd.DropTargetEvent;
import org.eclipse.swt.dnd.TextTransfer;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.swt.dnd.TransferData;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Link;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
import org.eclipse.swt.widgets.ToolBar;
import org.osgi.service.useradmin.Group;
import org.osgi.service.useradmin.Role;
//import org.eclipse.ui.forms.AbstractFormPart;
//import org.eclipse.ui.forms.IManagedForm;
//import org.eclipse.ui.forms.SectionPart;
//import org.eclipse.ui.forms.editor.FormEditor;
//import org.eclipse.ui.forms.editor.FormPage;
//import org.eclipse.ui.forms.widgets.FormToolkit;
//import org.eclipse.ui.forms.widgets.ScrolledForm;
//import org.eclipse.ui.forms.widgets.Section;
import org.osgi.service.useradmin.User;
import org.osgi.service.useradmin.UserAdmin;
import org.osgi.service.useradmin.UserAdminEvent;

/** Display/edit main properties of a given group */
public class GroupEditor extends AbstractRoleEditor {
	// final static String ID = "GroupEditor.mainPage";

	@Inject
	private EPartService partService;

	// private final UserEditor editor;
	@Inject
	private Repository repository;
	@Inject
	private NodeInstance nodeInstance;
	// private final UserAdminWrapper userAdminWrapper;
	private Session groupsSession;

	// public GroupMainPage(FormEditor editor, UserAdminWrapper userAdminWrapper,
	// Repository repository,
	// NodeInstance nodeInstance) {
	// super(editor, ID, "Main");
	// try {
	// session = repository.login();
	// } catch (RepositoryException e) {
	// throw new CmsException("Cannot retrieve session of in MainGroupPage
	// constructor", e);
	// }
	// this.editor = (UserEditor) editor;
	// this.userAdminWrapper = userAdminWrapper;
	// this.nodeInstance = nodeInstance;
	// }

	// protected void createFormContent(final IManagedForm mf) {
	// ScrolledForm form = mf.getForm();
	// Composite body = form.getBody();
	// GridLayout mainLayout = new GridLayout();
	// body.setLayout(mainLayout);
	// Group group = (Group) editor.getDisplayedUser();
	// appendOverviewPart(body, group);
	// appendMembersPart(body, group);
	// }

	@Override
	protected void createUi(Composite parent) {
		try {
			groupsSession = repository.login(NodeConstants.SRV_WORKSPACE);
		} catch (RepositoryException e) {
			throw new CmsException("Cannot retrieve session", e);
		}
		// ScrolledForm form = mf.getForm();
		// Composite body = form.getBody();
		// Composite body = new Composite(parent, SWT.NONE);
		Composite body = parent;
		GridLayout mainLayout = new GridLayout();
		body.setLayout(mainLayout);
		Group group = (Group) getDisplayedUser();
		appendOverviewPart(body, group);
		appendMembersPart(body, group);
	}

	@PreDestroy
	public void dispose() {
		JcrUtils.logoutQuietly(groupsSession);
		super.dispose();
	}

	/** Creates the general section */
	protected void appendOverviewPart(final Composite parent, final Group group) {
		Composite body = new Composite(parent, SWT.NONE);
		// GridLayout layout = new GridLayout(5, false);
		GridLayout layout = new GridLayout(2, false);
		body.setLayout(layout);
		body.setLayoutData(CmsUiUtils.fillWidth());

		String cn = UserAdminUtils.getProperty(group, LdapAttrs.cn.name());
		createReadOnlyLT(body, "Name", cn);
		createReadOnlyLT(body, "DN", group.getName());
		createReadOnlyLT(body, "Domain", UserAdminUtils.getDomainName(group));

		// Description
		Label descLbl = new Label(body, SWT.LEAD);
		descLbl.setFont(EclipseUiUtils.getBoldFont(body));
		descLbl.setText("Description");
		descLbl.setLayoutData(new GridData(SWT.LEAD, SWT.CENTER, true, false, 2, 1));
		final Text descTxt = new Text(body, SWT.LEAD | SWT.MULTI | SWT.WRAP | SWT.BORDER);
		GridData gd = EclipseUiUtils.fillWidth();
		gd.heightHint = 50;
		gd.horizontalSpan = 2;
		descTxt.setLayoutData(gd);

		// Mark as workgroup
		Link markAsWorkgroupLk = new Link(body, SWT.NONE);
		markAsWorkgroupLk.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false, 2, 1));

		// create form part (controller)
		final AbstractFormPart part = new AbstractFormPart() {

			private MainInfoListener listener;

			@Override
			public void initialize(IManagedForm form) {
				super.initialize(form);
				listener = new MainInfoListener(parent.getDisplay(), this);
				userAdminWrapper.addListener(listener);
			}

			@Override
			public void dispose() {
				userAdminWrapper.removeListener(listener);
				super.dispose();
			}

			public void commit(boolean onSave) {
				// group.getProperties().put(LdapAttrs.description.name(), descTxt.getText());
				setProperty(group, description, descTxt.getText());
				super.commit(onSave);
			}

			@Override
			public void refresh() {
				// dnTxt.setText(group.getName());
				// cnTxt.setText(UserAdminUtils.getProperty(group, LdapAttrs.cn.name()));
				descTxt.setText(UserAdminUtils.getProperty(group, LdapAttrs.description.name()));
				Node workgroupHome = NodeUtils.getGroupHome(groupsSession, cn);
				if (workgroupHome == null)
					markAsWorkgroupLk.setText("<a>Mark as workgroup</a>");
				else
					markAsWorkgroupLk.setText("Configured as workgroup");
				parent.layout(true, true);
				super.refresh();
			}
		};

		markAsWorkgroupLk.addSelectionListener(new SelectionAdapter() {
			private static final long serialVersionUID = -6439340898096365078L;

			@Override
			public void widgetSelected(SelectionEvent e) {

				boolean confirmed = MessageDialog.openConfirm(parent.getShell(), "Mark as workgroup",
						"Are you sure you want to mark " + cn + " as being a workgroup? ");
				if (confirmed) {
					Node workgroupHome = NodeUtils.getGroupHome(groupsSession, cn);
					if (workgroupHome != null)
						return; // already marked as workgroup, do nothing
					else
						try {
							// improve transaction management
							userAdminWrapper.beginTransactionIfNeeded();
							nodeInstance.createWorkgroup(new LdapName(group.getName()));
							setProperty(group, businessCategory, WORKGROUP);
							userAdminWrapper.commitOrNotifyTransactionStateChange();
							userAdminWrapper
									.notifyListeners(new UserAdminEvent(null, UserAdminEvent.ROLE_CHANGED, group));
							part.refresh();
						} catch (InvalidNameException e1) {
							throw new CmsException("Cannot create Workgroup for " + group.toString(), e1);
						}

				}
			}
		});

		ModifyListener defaultListener = new FormPartML(part);
		descTxt.addModifyListener(defaultListener);
		getManagedForm().addPart(part);
	}

	/** Filtered table with members. Has drag and drop ability */
	protected void appendMembersPart(Composite parent, Group group) {
		// Section section = tk.createSection(parent, Section.TITLE_BAR);
		// section.setText("Members");
		// section.setLayoutData(EclipseUiUtils.fillAll());

		Composite body = new Composite(parent, SWT.BORDER);
		body.setLayout(new GridLayout());
		// section.setClient(body);
		body.setLayoutData(EclipseUiUtils.fillAll());

		// Define the displayed columns
		List<ColumnDefinition> columnDefs = new ArrayList<ColumnDefinition>();
		columnDefs.add(new ColumnDefinition(new RoleIconLP(), "", 0, 24));
		columnDefs.add(new ColumnDefinition(new CommonNameLP(), "Name", 150));
		columnDefs.add(new ColumnDefinition(new MailLP(), "Mail", 150));
		// columnDefs.add(new ColumnDefinition(new UserNameLP(), "Distinguished Name",
		// 240));

		// Create and configure the table
		LdifUsersTable userViewerCmp = new MyUserTableViewer(body, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL,
				userAdminWrapper.getUserAdmin());

		userViewerCmp.setColumnDefinitions(columnDefs);
		userViewerCmp.populate(true, false);
		userViewerCmp.setLayoutData(EclipseUiUtils.fillAll());

		// Controllers
		TableViewer userViewer = userViewerCmp.getTableViewer();
		userViewer.addDoubleClickListener(new UserTableDefaultDClickListener(partService));
		int operations = DND.DROP_COPY | DND.DROP_MOVE;
		Transfer[] tt = new Transfer[] { TextTransfer.getInstance() };
		userViewer.addDropSupport(operations, tt,
				new GroupDropListener(userAdminWrapper, userViewerCmp, (Group) getDisplayedUser()));

		AbstractFormPart part = new GroupMembersPart(userViewerCmp);
		getManagedForm().addPart(part);

		// remove button
		// addRemoveAbility(toolBarManager, userViewerCmp.getTableViewer(), group);
		Action action = new RemoveMembershipAction(userViewer, group, "Remove selected items from this group",
				SecurityAdminImages.ICON_REMOVE_DESC);

		ToolBarManager toolBarManager = new ToolBarManager(SWT.FLAT);
		ToolBar toolBar = toolBarManager.createControl(body);
		toolBar.setLayoutData(CmsUiUtils.fillWidth());

		toolBarManager.add(action);
		toolBarManager.update(true);

	}

	// private LdifUsersTable createMemberPart(Composite parent, Group group) {
	//
	// // Define the displayed columns
	// List<ColumnDefinition> columnDefs = new ArrayList<ColumnDefinition>();
	// columnDefs.add(new ColumnDefinition(new RoleIconLP(), "", 0, 24));
	// columnDefs.add(new ColumnDefinition(new CommonNameLP(), "Name", 150));
	// columnDefs.add(new ColumnDefinition(new MailLP(), "Mail", 150));
	// // columnDefs.add(new ColumnDefinition(new UserNameLP(), "Distinguished
	// Name",
	// // 240));
	//
	// // Create and configure the table
	// LdifUsersTable userViewerCmp = new MyUserTableViewer(parent, SWT.MULTI |
	// SWT.H_SCROLL | SWT.V_SCROLL,
	// userAdminWrapper.getUserAdmin());
	//
	// userViewerCmp.setColumnDefinitions(columnDefs);
	// userViewerCmp.populate(true, false);
	// userViewerCmp.setLayoutData(EclipseUiUtils.fillAll());
	//
	// // Controllers
	// TableViewer userViewer = userViewerCmp.getTableViewer();
	// userViewer.addDoubleClickListener(new
	// UserTableDefaultDClickListener(partService));
	// int operations = DND.DROP_COPY | DND.DROP_MOVE;
	// Transfer[] tt = new Transfer[] { TextTransfer.getInstance() };
	// userViewer.addDropSupport(operations, tt,
	// new GroupDropListener(userAdminWrapper, userViewerCmp, (Group)
	// getDisplayedUser()));
	//
	// // userViewerCmp.refresh();
	// return userViewerCmp;
	// }

	// Local viewers
	private class MyUserTableViewer extends LdifUsersTable {
		private static final long serialVersionUID = 8467999509931900367L;

		private final UserFilter userFilter;

		public MyUserTableViewer(Composite parent, int style, UserAdmin userAdmin) {
			super(parent, style, true);
			userFilter = new UserFilter();

		}

		@Override
		protected List<User> listFilteredElements(String filter) {
			// reload user and set it in the editor
			Group group = (Group) getDisplayedUser();
			Role[] roles = group.getMembers();
			List<User> users = new ArrayList<User>();
			userFilter.setSearchText(filter);
			// userFilter.setShowSystemRole(true);
			for (Role role : roles)
				// if (role.getType() == Role.GROUP)
				if (userFilter.select(null, null, role))
					users.add((User) role);
			return users;
		}
	}

	// private void addRemoveAbility(ToolBarManager toolBarManager, TableViewer
	// userViewer, Group group) {
	// // Section section = sectionPart.getSection();
	// // ToolBarManager toolBarManager = new ToolBarManager(SWT.FLAT);
	// // ToolBar toolbar = toolBarManager.createControl(parent);
	// // ToolBar toolbar = toolBarManager.getControl();
	// // final Cursor handCursor = new Cursor(toolbar.getDisplay(),
	// SWT.CURSOR_HAND);
	// // toolbar.setCursor(handCursor);
	// // toolbar.addDisposeListener(new DisposeListener() {
	// // private static final long serialVersionUID = 3882131405820522925L;
	// //
	// // public void widgetDisposed(DisposeEvent e) {
	// // if ((handCursor != null) && (handCursor.isDisposed() == false)) {
	// // handCursor.dispose();
	// // }
	// // }
	// // });
	//
	// Action action = new RemoveMembershipAction(userViewer, group, "Remove
	// selected items from this group",
	// SecurityAdminImages.ICON_REMOVE_DESC);
	// toolBarManager.add(action);
	// toolBarManager.update(true);
	// // section.setTextClient(toolbar);
	// }

	private class RemoveMembershipAction extends Action {
		private static final long serialVersionUID = -1337713097184522588L;

		private final TableViewer userViewer;
		private final Group group;

		RemoveMembershipAction(TableViewer userViewer, Group group, String name, ImageDescriptor img) {
			super(name, img);
			this.userViewer = userViewer;
			this.group = group;
		}

		@Override
		public void run() {
			ISelection selection = userViewer.getSelection();
			if (selection.isEmpty())
				return;

			@SuppressWarnings("unchecked")
			Iterator<User> it = ((IStructuredSelection) selection).iterator();
			List<User> users = new ArrayList<User>();
			while (it.hasNext()) {
				User currUser = it.next();
				users.add(currUser);
			}

			userAdminWrapper.beginTransactionIfNeeded();
			for (User user : users) {
				group.removeMember(user);
			}
			userAdminWrapper.commitOrNotifyTransactionStateChange();
			userAdminWrapper.notifyListeners(new UserAdminEvent(null, UserAdminEvent.ROLE_CHANGED, group));
		}
	}

	// LOCAL CONTROLLERS
	private class GroupMembersPart extends AbstractFormPart {
		private final LdifUsersTable userViewer;
		// private final Group group;

		private GroupChangeListener listener;

		public GroupMembersPart(LdifUsersTable userViewer) {
			// super(section);
			this.userViewer = userViewer;
			// this.group = group;
		}

		@Override
		public void initialize(IManagedForm form) {
			super.initialize(form);
			listener = new GroupChangeListener(userViewer.getDisplay(), GroupMembersPart.this);
			userAdminWrapper.addListener(listener);
		}

		@Override
		public void dispose() {
			userAdminWrapper.removeListener(listener);
			super.dispose();
		}

		@Override
		public void refresh() {
			userViewer.refresh();
			super.refresh();
		}
	}

	/**
	 * Defines this table as being a potential target to add group membership
	 * (roles) to this group
	 */
	private class GroupDropListener extends ViewerDropAdapter {
		private static final long serialVersionUID = 2893468717831451621L;

		private final UserAdminWrapper userAdminWrapper;
		// private final LdifUsersTable myUserViewerCmp;
		private final Group myGroup;

		public GroupDropListener(UserAdminWrapper userAdminWrapper, LdifUsersTable userTableViewerCmp, Group group) {
			super(userTableViewerCmp.getTableViewer());
			this.userAdminWrapper = userAdminWrapper;
			this.myGroup = group;
			// this.myUserViewerCmp = userTableViewerCmp;
		}

		@Override
		public boolean validateDrop(Object target, int operation, TransferData transferType) {
			// Target is always OK in a list only view
			// TODO check if not a string
			boolean validDrop = true;
			return validDrop;
		}

		@Override
		public void drop(DropTargetEvent event) {
			// TODO Is there an opportunity to perform the check before?
			String newUserName = (String) event.data;
			UserAdmin myUserAdmin = userAdminWrapper.getUserAdmin();
			Role role = myUserAdmin.getRole(newUserName);
			if (role.getType() == Role.GROUP) {
				Group newGroup = (Group) role;
				Shell shell = getViewer().getControl().getShell();
				// Sanity checks
				if (myGroup == newGroup) { // Equality
					MessageDialog.openError(shell, "Forbidden addition ", "A group cannot be a member of itself.");
					return;
				}

				// Cycle
				String myName = myGroup.getName();
				List<User> myMemberships = getFlatGroups(myGroup);
				if (myMemberships.contains(newGroup)) {
					MessageDialog.openError(shell, "Forbidden addition: cycle",
							"Cannot add " + newUserName + " to group " + myName + ". This would create a cycle");
					return;
				}

				// Already member
				List<User> newGroupMemberships = getFlatGroups(newGroup);
				if (newGroupMemberships.contains(myGroup)) {
					MessageDialog.openError(shell, "Forbidden addition",
							"Cannot add " + newUserName + " to group " + myName + ", this membership already exists");
					return;
				}
				userAdminWrapper.beginTransactionIfNeeded();
				myGroup.addMember(newGroup);
				userAdminWrapper.commitOrNotifyTransactionStateChange();
				userAdminWrapper.notifyListeners(new UserAdminEvent(null, UserAdminEvent.ROLE_CHANGED, myGroup));
			} else if (role.getType() == Role.USER) {
				// TODO check if the group is already member of this group
				WorkTransaction transaction = userAdminWrapper.beginTransactionIfNeeded();
				User user = (User) role;
				myGroup.addMember(user);
				if (UserAdminWrapper.COMMIT_ON_SAVE)
					try {
						transaction.commit();
					} catch (Exception e) {
						throw new CmsException("Cannot commit transaction " + "after user group membership update", e);
					}
				userAdminWrapper.notifyListeners(new UserAdminEvent(null, UserAdminEvent.ROLE_CHANGED, myGroup));
			}
			super.drop(event);
		}

		@Override
		public boolean performDrop(Object data) {
			// myUserViewerCmp.refresh();
			return true;
		}
	}

	// LOCAL HELPERS
	// private Composite addSection(FormToolkit tk, Composite parent) {
	// Section section = tk.createSection(parent, SWT.NO_FOCUS);
	// section.setLayoutData(EclipseUiUtils.fillWidth());
	// Composite body = tk.createComposite(section, SWT.WRAP);
	// body.setLayoutData(EclipseUiUtils.fillAll());
	// section.setClient(body);
	// return body;
	// }

	/** Creates label and text. */
	// private Text createLT(Composite parent, String label, String value) {
	// FormToolkit toolkit = getManagedForm().getToolkit();
	// Label lbl = toolkit.createLabel(parent, label);
	// lbl.setLayoutData(new GridData(SWT.LEAD, SWT.CENTER, false, false));
	// lbl.setFont(EclipseUiUtils.getBoldFont(parent));
	// Text text = toolkit.createText(parent, value, SWT.BORDER);
	// text.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
	// CmsUiUtils.style(text, CmsWorkbenchStyles.WORKBENCH_FORM_TEXT);
	// return text;
	// }
	//
	// Text createReadOnlyLT(Composite parent, String label, String value) {
	// FormToolkit toolkit = getManagedForm().getToolkit();
	// Label lbl = toolkit.createLabel(parent, label);
	// lbl.setLayoutData(new GridData(SWT.LEAD, SWT.CENTER, false, false));
	// lbl.setFont(EclipseUiUtils.getBoldFont(parent));
	// Text text = toolkit.createText(parent, value, SWT.NONE);
	// text.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
	// text.setEditable(false);
	// CmsUiUtils.style(text, CmsWorkbenchStyles.WORKBENCH_FORM_TEXT);
	// return text;
	// }

}