package org.csstudio.sds.ui.internal.editor.newproperties;

import org.csstudio.sds.internal.model.ArrayOptionProperty;
import org.eclipse.jface.viewers.ArrayContentProvider;
import org.eclipse.jface.viewers.ComboViewer;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.CCombo;
import org.eclipse.swt.layout.FormAttachment;
import org.eclipse.swt.layout.FormData;
import org.eclipse.swt.layout.FormLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.ui.views.properties.tabbed.TabbedPropertySheetPage;

/**
 * Section implementation for {@link ArrayOptionProperty}.
 * 
 * @author Sven Wende
 * 
 */
public class ArrayOptionSection extends AbstractBaseSection<ArrayOptionProperty> {

	private ComboViewer optionViewer;
	private ISelectionChangedListener changeListener;

	public ArrayOptionSection(String propertyId) {
		super(propertyId);
	}

	/**
	 *{@inheritDoc}
	 */
	@Override
	protected void doCreateControls(Composite parent, TabbedPropertySheetPage tabbedPropertySheetPage) {
		parent.setLayout(new FormLayout());
		
		// .. create a combo and the corresponding viewer
		CCombo combo = getWidgetFactory().createCCombo(parent, SWT.BORDER | SWT.READ_ONLY);

		FormData fd = new FormData();
		fd.left = new FormAttachment(0,0);
		fd.right = new FormAttachment(50,0);
		combo.setLayoutData(fd);
		
		optionViewer = new ComboViewer(combo);
		optionViewer.setLabelProvider(new LabelProvider() {
			@Override
			public String getText(Object element) {
				return element.toString();
			}
		});

		optionViewer.setContentProvider(new ArrayContentProvider());

		// .. listen to changes
		changeListener = new ISelectionChangedListener() {
			@Override
			public void selectionChanged(SelectionChangedEvent event) {
				String[] options = (String[]) optionViewer.getInput();
				Object tmp = ((IStructuredSelection) optionViewer.getSelection()).getFirstElement();
				for (int i = 0; i < options.length; i++) {
					if (options[i].equals(tmp)) {
						// .. the selection index is the needed value, not the
						// String itself!
						applyPropertyChange(i);
						return;
					}
				}
			}
		};
		optionViewer.addSelectionChangedListener(changeListener);
	}

	@Override
	protected void doRefreshControls(ArrayOptionProperty widgetProperty) {
		if (!optionViewer.getControl().isDisposed()) {
			if (widgetProperty != null) {
				int index = widgetProperty.getPropertyValue();
				String[] options = widgetProperty.getOptions();
				optionViewer.setInput(options);

				optionViewer.removeSelectionChangedListener(changeListener);
				optionViewer.setSelection(new StructuredSelection(options[index]));
				optionViewer.addSelectionChangedListener(changeListener);
			}
		}
	}

}