EDIT

// $Id$

/**

 * Copyright (C) 2007 EDIT

 * European Distributed Institute of Taxonomy 

 * http://www.e-taxonomy.eu

 * 

 * The contents of this file are subject to the Mozilla Public License Version 1.1

 * See LICENSE.TXT at the top of this package for the full license terms.

 */

package eu.etaxonomy.taxeditor.featuretree;

import java.util.Collection;

import org.eclipse.core.runtime.IStatus;

import org.eclipse.jface.viewers.ISelectionChangedListener;

import org.eclipse.jface.viewers.IStructuredSelection;

import org.eclipse.jface.viewers.SelectionChangedEvent;

import org.eclipse.jface.viewers.TreeViewer;

import org.eclipse.jface.viewers.Viewer;

import org.eclipse.jface.viewers.ViewerDropAdapter;

import org.eclipse.jface.wizard.WizardDialog;

import org.eclipse.jface.wizard.WizardPage;

import org.eclipse.swt.SWT;

import org.eclipse.swt.dnd.DND;

import org.eclipse.swt.dnd.DragSourceAdapter;

import org.eclipse.swt.dnd.DragSourceEvent;

import org.eclipse.swt.dnd.Transfer;

import org.eclipse.swt.dnd.TransferData;

import org.eclipse.swt.events.ModifyEvent;

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.Button;

import org.eclipse.swt.widgets.Composite;

import org.eclipse.swt.widgets.Label;

import org.eclipse.swt.widgets.Text;

import eu.etaxonomy.cdm.api.service.IFeatureNodeService;

import eu.etaxonomy.cdm.model.description.Feature;

import eu.etaxonomy.cdm.model.description.FeatureNode;

import eu.etaxonomy.cdm.model.description.FeatureTree;

import eu.etaxonomy.taxeditor.model.MessagingUtils;

import eu.etaxonomy.taxeditor.store.CdmStore;

/**

 * <p>

 * EditFeatureTreeWizardPage class.

 * </p>

 * 

 * @author n.hoffmann

 * @created Aug 5, 2010

 * @version 1.0

 */

public class EditFeatureTreeWizardPage extends WizardPage implements

		ModifyListener, ISelectionChangedListener {

	private TreeViewer viewer;

	private Label label_title;

	private Text text_title;

	private Button button_add;

	private Button button_remove;

	private Label label_treeInfo;

	private FeatureTree featureTree;

	/**

	 * <p>

	 * Constructor for EditFeatureTreeWizardPage.

	 * </p>

	 * 

	 * @param pageName

	 *            a {@link java.lang.String} object.

	 */

	protected EditFeatureTreeWizardPage(String pageName) {

		super(pageName);

		setMessage("Edit the Feature Tree.");

	}

	/*

	 * (non-Javadoc)

	 * 

	 * @see

	 * org.eclipse.jface.dialogs.IDialogPage#createControl(org.eclipse.swt.widgets

	 * .Composite)

	 */

	/** {@inheritDoc} */

	@Override

	public void createControl(Composite parent) {

		Composite composite = new Composite(parent, SWT.NULL);

		composite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));

		composite.setLayout(new GridLayout());

		Composite composite_treeTitle = new Composite(composite, SWT.NULL);

		composite_treeTitle.setLayoutData(new GridData(SWT.FILL, SWT.TOP, true,

				false));

		composite_treeTitle.setLayout(new GridLayout(2, false));

		label_title = new Label(composite_treeTitle, SWT.NULL);

		label_title.setText("Title");

		text_title = new Text(composite_treeTitle, SWT.NULL);

		text_title.setLayoutData(new GridData(SWT.FILL, SWT.TOP, true, false));

		Composite composite_treeContent = new Composite(composite, SWT.NULL);

		composite_treeContent.setLayoutData(new GridData(SWT.FILL, SWT.FILL,

				true, true));

		composite_treeContent.setLayout(new GridLayout(2, false));

		viewer = new TreeViewer(composite_treeContent);

		viewer.getControl().setLayoutData(

				new GridData(SWT.FILL, SWT.FILL, true, true));

		Composite composite_buttons = new Composite(composite_treeContent,

				SWT.NULL);

		composite_buttons.setLayoutData(new GridData(SWT.LEFT, SWT.TOP, false,

				false));

		composite_buttons.setLayout(new GridLayout());

		button_add = new Button(composite_buttons, SWT.PUSH);

		button_add.setText("Add");

		button_add.setToolTipText("Add a feature to this feature treee.");

		button_remove = new Button(composite_buttons, SWT.PUSH);

		button_remove.setText("Remove");

		button_remove

				.setToolTipText("Remove a feature from this feature tree.");

		label_treeInfo = new Label(composite, SWT.NULL);

		label_treeInfo

				.setText("Order and nesting of feature nodes may be changed through drag and drop.");

		viewer.setContentProvider(new FeatureTreeContentProvider());

		viewer.setLabelProvider(new FeatureTreeLabelProvider());

		int ops = DND.DROP_COPY | DND.DROP_MOVE;

		Transfer[] transfers = new Transfer[] { FeatureNodeTransfer

				.getInstance() };

		viewer.addDragSupport(ops, transfers, new FeatureNodeDragListener(

				viewer));

		viewer.addDropSupport(ops, transfers,

				new FeatureNodeDropAdapter(viewer));

		viewer.addSelectionChangedListener(this);

		button_add.addSelectionListener(new AddButtonListener());

		button_remove.addSelectionListener(new RemoveSelectionListener());

		setControl(composite);

	}

	/**

	 * <p>

	 * setSelectedTree

	 * </p>

	 * 

	 * @param featureTree

	 *            a {@link eu.etaxonomy.cdm.model.description.FeatureTree}

	 *            object.

	 */

	public void setSelectedTree(FeatureTree featureTree) {

		this.featureTree = featureTree;

		viewer.setInput(featureTree);

		text_title.removeModifyListener(this);

		text_title.setText(featureTree.getTitleCache());

		text_title.addModifyListener(this);

	}

	/** {@inheritDoc} */

	@Override

	public void modifyText(ModifyEvent e) {

		featureTree.setTitleCache(text_title.getText(), true);

	}

	/** {@inheritDoc} */

	@Override

	public void selectionChanged(SelectionChangedEvent event) {

		IStructuredSelection selection = (IStructuredSelection) event

				.getSelection();

		button_add.setEnabled(selection.size() <= 1);

		button_remove.setEnabled(selection.size() > 0);

	}

	private class AddButtonListener extends SelectionAdapter {

		@Override

		public void widgetSelected(SelectionEvent e) {

			AvailableFeaturesWizard wizard = new AvailableFeaturesWizard(

					featureTree);

			WizardDialog dialog = new WizardDialog(getShell(), wizard);

			if (dialog.open() == IStatus.OK) {

				IStructuredSelection selection = (IStructuredSelection) viewer

						.getSelection();

				FeatureNode parent = (FeatureNode) (selection.getFirstElement() != null ? selection

						.getFirstElement() : ((FeatureTree) viewer.getInput())

						.getRoot());

				Collection<Feature> additionalFeatures = wizard

						.getAdditionalFeatures();

				for (Feature feature : additionalFeatures) {

					FeatureNode child = FeatureNode.NewInstance(feature);

					CdmStore.getService(IFeatureNodeService.class)

							.saveOrUpdate(child);

					parent.addChild(child);

				}

				viewer.refresh();

			}

		}

	}

	private class RemoveSelectionListener extends SelectionAdapter {

		@Override

		public void widgetSelected(SelectionEvent e) {

			IStructuredSelection selection = (IStructuredSelection) viewer

					.getSelection();

			for (Object selectedObject : selection.toArray()) {

				FeatureNode featureNode = (FeatureNode) selectedObject;

				FeatureNode parent = featureNode.getParent();

				parent.removeChild(featureNode);

			}

			viewer.refresh();

		}

	}

	private class FeatureNodeDragListener extends DragSourceAdapter {

		private final TreeViewer viewer;

		public FeatureNodeDragListener(TreeViewer viewer) {

			this.viewer = viewer;

		}

		/**

		 * Method declared on DragSourceListener

		 */

		@Override

		public void dragFinished(DragSourceEvent event) {

			if (!event.doit)

				return;

			// if the featureNode was moved, remove it from the source viewer

			if (event.detail == DND.DROP_MOVE) {

				IStructuredSelection selection = (IStructuredSelection) viewer

						.getSelection();

				viewer.refresh();

			}

		}

		/**

		 * Method declared on DragSourceListener

		 */

		@Override

		public void dragSetData(DragSourceEvent event) {

			IStructuredSelection selection = (IStructuredSelection) viewer

					.getSelection();

			FeatureNode[] featureNodes = (FeatureNode[]) selection.toList()

					.toArray(new FeatureNode[selection.size()]);

			if (FeatureNodeTransfer.getInstance().isSupportedType(

					event.dataType)) {

				event.data = featureNodes;

			}

		}

		/**

		 * Method declared on DragSourceListener

		 */

		@Override

		public void dragStart(DragSourceEvent event) {

			event.doit = !viewer.getSelection().isEmpty();

		}

	}

	private class FeatureNodeDropAdapter extends ViewerDropAdapter {

		protected FeatureNodeDropAdapter(Viewer viewer) {

			super(viewer);

		}

		@Override

		public boolean performDrop(Object data) {

			FeatureNode target = (FeatureNode) getCurrentTarget();

			int position = 0;

			if (target != null) {

				int location = getCurrentLocation();

				FeatureNode parent = target.getParent();

				if (location == LOCATION_BEFORE) {

					position = Math.max(0, parent.getIndex(target) - 1);

					target = parent;

				}

				if (location == LOCATION_AFTER) {

					position = parent.getIndex(target);

					target = parent;

				}

			}

			// set target to root node if there is no target specified

			if (target == null) {

				FeatureTree featureTree = (FeatureTree) getViewer().getInput();

				target = featureTree.getRoot();

			}

			Object[] droppedObjects = (Object[]) data;

			TreeViewer viewer = (TreeViewer) getViewer();

			// cannot drop a feature node onto itself

			for (Object droppedObject : droppedObjects) {

				if (droppedObject == null) {

					MessagingUtils.warningDialog(

									"Operation not supported yet",

									this,

									"We are currently unable to change the order of freshly created "

											+ "feature trees nodes. Please close and reopen the dialog to change the order of features.");

					return false;

				}

				if (droppedObject.equals(target)) {

					return false;

				}

			}

			for (Object droppedObject : droppedObjects) {

				FeatureNode droppedNode = (FeatureNode) droppedObject;

				target.addChild(droppedNode, position);

				viewer.add(target, droppedNode);

				viewer.reveal(droppedNode);

			}

			return true;

		}

		@Override

		public boolean validateDrop(Object target, int operation,

				TransferData transferData) {

			return FeatureNodeTransfer.getInstance().isSupportedType(

					transferData);

		}

	}

}