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// Metawidget
//
// This file is dual licensed under both the LGPL
// (http://www.gnu.org/licenses/lgpl-2.1.html) and the EPL
// (http://www.eclipse.org/org/documents/epl-v10.php). As a
// recipient of Metawidget, you may choose to receive it under either
// the LGPL or the EPL.
//
// Commercial licenses are also available. See http://metawidget.org
// for details.

package org.metawidget.swt.widgetbuilder;

import static org.metawidget.inspector.InspectionResultConstants.*;

import java.util.Collection;
import java.util.Date;
import java.util.Map;

import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Text;
import org.metawidget.swt.Stub;
import org.metawidget.swt.SwtMetawidget;
import org.metawidget.swt.SwtValuePropertyProvider;
import org.metawidget.util.WidgetBuilderUtils;
import org.metawidget.widgetbuilder.iface.WidgetBuilder;

/**
 * WidgetBuilder for SWT environments.
 * 
 * Creates native SWT read-only Controls, such as Labels, to suit the
 * inspected fields.
 *
 * @author Richard Kennard
 */

public class ReadOnlyWidgetBuilder
	implements WidgetBuilder, SwtValuePropertyProvider {

	//
	// Public methods
	//

	public String getValueProperty( Control control ) {

		if ( control instanceof Label ) {
			return "text";
		}

		return null;
	}

	public Control buildWidget( String elementName, Map attributes, SwtMetawidget metawidget ) {

		// Not read-only?

		if ( !WidgetBuilderUtils.isReadOnly( attributes ) ) {
			return null;
		}

		// Hidden

		if ( TRUE.equals( attributes.get( HIDDEN ) ) ) {
			return new Stub( metawidget.getCurrentLayoutComposite(), SWT.NONE );
		}

		// Action

		if ( ACTION.equals( elementName ) ) {
			Button button = new Button( metawidget.getCurrentLayoutComposite(), SWT.NONE );
			button.setText( metawidget.getLabelString( attributes ) );
			button.setEnabled( false );

			return button;
		}

		// Masked (return a Composite, so that we DO still render a label)

		if ( TRUE.equals( attributes.get( MASKED ) ) ) {
			return new Composite( metawidget.getCurrentLayoutComposite(), SWT.NONE );
		}

		// Lookups

		String lookup = attributes.get( LOOKUP );

		if ( lookup != null && !"".equals( lookup ) ) {
			return new Label( metawidget.getCurrentLayoutComposite(), SWT.NONE );
		}

		// Lookup the Class

		Class clazz = WidgetBuilderUtils.getActualClassOrType( attributes, String.class );

		if ( clazz != null ) {
			// Primitives

			if ( clazz.isPrimitive() ) {
				return new Label( metawidget.getCurrentLayoutComposite(), SWT.NONE );
			}

			if ( String.class.equals( clazz ) ) {
				if ( TRUE.equals( attributes.get( LARGE ) ) ) {
					return new Text( metawidget.getCurrentLayoutComposite(), SWT.READ_ONLY | SWT.MULTI | SWT.BORDER | SWT.V_SCROLL | SWT.WRAP );
				}

				return new Label( metawidget.getCurrentLayoutComposite(), SWT.NONE );
			}

			if ( Character.class.equals( clazz ) ) {
				return new Label( metawidget.getCurrentLayoutComposite(), SWT.NONE );
			}

			if ( Date.class.equals( clazz ) ) {
				return new Label( metawidget.getCurrentLayoutComposite(), SWT.NONE );
			}

			if ( Boolean.class.equals( clazz ) ) {
				return new Label( metawidget.getCurrentLayoutComposite(), SWT.NONE );
			}

			if ( Number.class.isAssignableFrom( clazz ) ) {
				return new Label( metawidget.getCurrentLayoutComposite(), SWT.NONE );
			}

			// Collections

			if ( Collection.class.isAssignableFrom( clazz ) ) {
				return new Stub( metawidget.getCurrentLayoutComposite(), SWT.NONE );
			}
		}

		// Not simple, but don't expand

		if ( TRUE.equals( attributes.get( DONT_EXPAND ) ) ) {
			return new Label( metawidget.getCurrentLayoutComposite(), SWT.NONE );
		}

		// Nested Metawidget

		return null;
	}
}