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.List;

import org.eclipse.core.commands.ExecutionException;

import org.eclipse.jface.viewers.ISelectionChangedListener;

import org.eclipse.jface.viewers.IStructuredSelection;

import org.eclipse.jface.viewers.ListViewer;

import org.eclipse.jface.viewers.SelectionChangedEvent;

import org.eclipse.jface.viewers.StructuredSelection;

import org.eclipse.jface.wizard.WizardPage;

import org.eclipse.swt.SWT;

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.IFeatureTreeService;

import eu.etaxonomy.cdm.api.service.exception.DataChangeNoRollbackException;

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

import eu.etaxonomy.taxeditor.store.CdmStore;

import eu.etaxonomy.taxeditor.store.StoreUtil;

/**

 * <p>SelectFeatureTreeWizardPage class.</p>

 *

 * @author n.hoffmann

 * @created Aug 5, 2010

 * @version 1.0

 */

public class SelectFeatureTreeWizardPage extends WizardPage implements ISelectionChangedListener, ModifyListener{

	private ListViewer viewer;

	private Text text_title;

	private Button button_add;

	private Button button_remove;

	/**

	 * <p>Constructor for SelectFeatureTreeWizardPage.</p>

	 *

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

	 */

	protected SelectFeatureTreeWizardPage(String pageName) {

		super(pageName);

		setMessage("Select a Feature Tree or create a new one.");

	}

	/* (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.setLayout(new GridLayout());

		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 ListViewer(composite_treeContent);

		viewer.getControl().setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));

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

		button_remove.setText("Remove");

		button_remove.setLayoutData(new GridData(SWT.RIGHT, SWT.TOP, false, false));

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

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

				false));

		composite_treeTitle.setLayout(new GridLayout(3, false));

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

		label_title.setText("New Feature Tree");

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

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

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

		button_add.setText("Add");

		viewer.setContentProvider(new FeatureTreeContentProvider());

		viewer.setLabelProvider(new FeatureTreeLabelProvider());

		viewer.addSelectionChangedListener(this);

		text_title.addModifyListener(this);

		button_add.addSelectionListener(new AddButtonSelectionListener());

		button_remove.addSelectionListener(new RemoveButtonSelectionListener());

		List<FeatureTree> input = CdmStore.getService(IFeatureTreeService.class).list(FeatureTree.class, null, null, null, null);

		viewer.setInput(input);

		modifyText(null);

		setControl(composite);

	}

	/** {@inheritDoc} */

	@Override

	public void selectionChanged(SelectionChangedEvent event) {

		IStructuredSelection selection = (IStructuredSelection) event.getSelection();

		if(selection.size() == 1){

			FeatureTree selectedFeatureTree = (FeatureTree) selection.getFirstElement();

			((FeatureTreeEditorWizard) getWizard()).setSelectedFeatureTree(selectedFeatureTree);

		}

		setPageComplete(true);

		button_remove.setEnabled(selection.size() >= 1);

	}

	/** {@inheritDoc} */

	@Override

	public boolean canFlipToNextPage() {

		return ((IStructuredSelection) viewer.getSelection()).size() == 1;

	}

	/** {@inheritDoc} */

	@Override

	public void modifyText(ModifyEvent e) {

		button_add.setEnabled(! text_title.getText().isEmpty());

	}

	private class AddButtonSelectionListener extends SelectionAdapter {

		public void widgetSelected(SelectionEvent e) {

			FeatureTree featureTree = FeatureTree.NewInstance();

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

			viewer.add(featureTree);

			CdmStore.getService(IFeatureTreeService.class).saveOrUpdate(featureTree);

			text_title.setText("");

			viewer.setSelection(new StructuredSelection(featureTree));

		}

	}

	private class RemoveButtonSelectionListener extends SelectionAdapter {

		public void widgetSelected(SelectionEvent e) {

			IStructuredSelection selection = (IStructuredSelection) viewer.getSelection();

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

				viewer.remove(element);

				try{

					CdmStore.getService(IFeatureTreeService.class).delete((FeatureTree) element);

				} catch (DataChangeNoRollbackException d) {

					StoreUtil.warningDialog(

							"Feature can not be removed",

							this,

							"The selected feature can not be removed from the feature tree.");

				}

				viewer.setSelection(new StructuredSelection(new Object[0]));

			}

		}

	}

}