/*
 *                                                                            
 *  Copyright (c) 2011, 2016 - Loetz GmbH&Co.KG (69115 Heidelberg, Germany) 
 *                                                                            
 *  All rights reserved. This program and the accompanying materials           
 *  are made available under the terms of the Eclipse Public License 2.0        
 *  which accompanies this distribution, and is available at                  
 *  https://www.eclipse.org/legal/epl-2.0/                                 
 *                                 
 *  SPDX-License-Identifier: EPL-2.0                                 
 *                                                                            
 *  Contributors:                                                      
 * 	   Florian Pirchner - Initial implementation
 *     Loetz GmbH&Co.KG                               
 * 
 */
package org.eclipse.osbp.vaadin.emf.data.fields;

import java.util.Collection;

import org.eclipse.emf.ecore.EObject;
import org.eclipse.osbp.runtime.web.vaadin.common.resource.IResourceProvider;
import org.eclipse.osbp.vaadin.emf.api.IModelingContext;
import org.eclipse.osbp.vaadin.emf.data.JvmSubTypesContainer;
import org.eclipse.osbp.vaadin.emf.data.JvmSubTypesContainer.SubTypesCallback;
import org.eclipse.xtext.common.types.JvmDeclaredType;

import com.vaadin.data.util.ObjectProperty;
import com.vaadin.ui.ComboBox;
import com.vaadin.ui.Component;
import com.vaadin.ui.CustomField;

/**
 * A combobox to select referenced JvmDeclaredType.
 */
@SuppressWarnings("serial")
public class JvmSubTypesComboBox extends CustomField<JvmDeclaredType> {

	/** The combobox. */
	private ComboBox combobox;

	/** The property. */
	private ObjectProperty<JvmDeclaredType> property;

	JvmSubTypesContainer container;

	/**
	 * Instantiates a new e object combo box.
	 *
	 * @param adapterFactory
	 *            the adapter factory
	 */
	public JvmSubTypesComboBox(IModelingContext modelingContext,
			IResourceProvider resourceProvider, SubTypesCallback callback) {
		container = new JvmSubTypesContainer(modelingContext, resourceProvider,
				callback);

		// eager init
		initContent();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see com.vaadin.ui.CustomField#initContent()
	 */
	@Override
	protected Component initContent() {
		if (combobox != null) {
			return combobox;
		}

		combobox = new ComboBox();
		combobox.setWidth("100%");

		combobox.setContainerDataSource(container);

		combobox.setItemCaptionPropertyId(JvmSubTypesContainer.LABEL);
		combobox.setItemIconPropertyId(JvmSubTypesContainer.ICON);

		property = new ObjectProperty<JvmDeclaredType>(null,
				JvmDeclaredType.class);
		combobox.setPropertyDataSource(property);

		property.addValueChangeListener(e -> {
			super.setValue((JvmDeclaredType) e.getProperty().getValue());
		});

		return combobox;
	}

	/**
	 * Returns the root type.
	 * 
	 * @return
	 */
	public EObject getRootType() {
		return container.getRootElement();
	}

	/**
	 * Sets the root type.
	 * 
	 * @param rootElement
	 */
	public void setRootType(JvmDeclaredType rootElement) {
		container.setRootElement(rootElement);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see com.vaadin.ui.AbstractField#getType()
	 */
	@Override
	public Class<JvmDeclaredType> getType() {
		return JvmDeclaredType.class;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see com.vaadin.ui.AbstractField#setInternalValue(java.lang.Object)
	 */
	@Override
	protected void setInternalValue(JvmDeclaredType newValue) {
		super.setInternalValue(newValue);

		if (property != null) {
			property.setValue(newValue);
		}
	}

	/**
	 * Gets the collection.
	 *
	 * @return the collection
	 */
	@SuppressWarnings("unchecked")
	public Collection<JvmDeclaredType> getCollection() {
		return (Collection<JvmDeclaredType>) combobox.getItemIds();
	}

}