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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.gwt.client.widgetbuilder.extgwt;

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

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

import org.metawidget.gwt.client.ui.GwtMetawidget;
import org.metawidget.gwt.client.ui.GwtUtils;
import org.metawidget.gwt.client.ui.GwtValueAccessor;
import org.metawidget.widgetbuilder.iface.WidgetBuilder;

import com.extjs.gxt.ui.client.widget.Slider;
import com.extjs.gxt.ui.client.widget.form.DateField;
import com.google.gwt.user.client.ui.Widget;

/**
 * WidgetBuilder for RichFaces environments.
 * 
 * Creates native ExtGWT widgets, such as DateField, to suit the inspected fields.
 *
 * @author Richard Kennard
 */

public class ExtGwtWidgetBuilder
	implements WidgetBuilder, GwtValueAccessor {

	//
	// Public methods
	//

	public Object getValue( Widget widget ) {

		if ( widget instanceof DateField ) {
			return ( (DateField) widget ).getValue();
		}

		if ( widget instanceof Slider ) {
			return ( (Slider) widget ).getValue();
		}

		return null;
	}

	public boolean setValue( Widget widget, Object value ) {

		if ( widget instanceof DateField ) {
			( (DateField) widget ).setValue( (Date) value );
			return true;
		}

		if ( widget instanceof Slider ) {
			( (Slider) widget ).setValue( (Integer) value );
			return true;
		}

		// Not for us

		return false;
	}

	public Widget buildWidget( String elementName, Map attributes, GwtMetawidget metawidget ) {

		// Not for ExtGWT?

		if ( ACTION.equals( elementName ) ) {
			return null;
		}

		if ( TRUE.equals( attributes.get( HIDDEN ) ) ) {
			return null;
		}

		if ( attributes.containsKey( LOOKUP ) ) {
			return null;
		}

		String type = GwtUtils.getActualClassOrType( attributes );

		if ( type == null ) {
			return null;
		}

		// Dates

		if ( Date.class.getName().equals( type ) ) {
			return new DateField();
		}

		// Slider

		if ( GwtUtils.isIntegerPrimitive( type ) ) {
			// Ranged

			String minimumValue = attributes.get( MINIMUM_VALUE );
			String maximumValue = attributes.get( MAXIMUM_VALUE );

			if ( minimumValue != null && !"".equals( minimumValue ) && maximumValue != null && !"".equals( maximumValue ) ) {
				Slider slider = new Slider();
				slider.setMinValue( (int) Math.ceil( Double.parseDouble( minimumValue ) ) );
				slider.setMaxValue( (int) Math.floor( Double.parseDouble( maximumValue ) ) );

				// (do this for sanity)

				slider.setValue( slider.getMinValue() );

				// (default increment is 10)

				slider.setIncrement( 1 );

				return slider;
			}
		}

		// Not for ExtGWT

		return null;
	}
}