// This Source Code is in the Public Domain per: http://unlicense.org
package org.litesoft.GWT.forms.client.components.factories.input;

import java.io.*;

import org.litesoft.GWT.forms.client.components.factories.*;
import org.litesoft.GWT.forms.client.components.impls.input.*;
import org.litesoft.GWT.forms.client.nonpublic.*;
import org.litesoft.core.simpletypes.*;
import org.litesoft.ui.def.nonpublic.*;
import org.litesoft.ui.def.nonpublic.support.*;
import org.litesoft.uispecification.*;

import com.google.gwt.user.client.ui.*;

public class UiRadioGroupWidgetFactory implements InputWidgetFactory
{
    public Widget create( FormInstanceComponentHandler pComponentHandler, //
                          UiInputDef pUiDef, AttributeMetaData pMetaData,
                          boolean pHasHorizontalPeer )
    {
        RadioGroupMetaData zMD = (RadioGroupMetaData) pMetaData;

        String zLabelText = zMD.getExternalText();
        UiFont zLabelFont = pUiDef.getLabelFont();
        String zTooltip = zMD.getTooltip();

        FormRadioGroup zFC = new FormRadioGroup( zLabelText, zLabelFont, zTooltip, //
                                                 zMD.getValidOptions() );

        return new MyFormAdapter( pComponentHandler, zMD, zFC ).init();
    }

    private static final class MyFormAdapter extends AbstractFormAttributeAdapter
    {
        private SimpleKeyValuePair mOptionZero;
        private FormRadioGroup mFC;

        public MyFormAdapter( FormInstanceComponentHandler pComponentHandler, //
                              RadioGroupMetaData pMD, FormRadioGroup pFC )
        {
            super( pComponentHandler, pMD, pFC );
            mOptionZero = pMD.getValidOptions()[0];
            mFC = pFC;
            setBaseValue( null );
        }

        protected void publishChangedState( boolean pChangedState )
        {
            super.publishChangedState( pChangedState );
            optionallyPublishUpdatedValue();
        }

        protected Object convertSendableToComponentValue( Serializable pValue )
        {
            return convertOption( pValue );
        }

        private SimpleKeyValuePair convertOption( Serializable pValue )
        {
            if ( pValue == null )
            {
                return mOptionZero;
            }
            return (pValue instanceof SimpleKeyValuePair) ? //
                   (SimpleKeyValuePair) pValue : //
                   new StringKeyValuePair( pValue.toString() );
        }

        protected String convertComponentValueToString( Object pValue )
        {
            if ( pValue instanceof SimpleKeyValuePair )
            {
                return "@" + ((SimpleKeyValuePair) pValue).getKey();
            }
            return (pValue == null) ? "null" : "?" + pValue;
        }

        protected Object convertStringToComponentValue( String pValue )
        {
            return (pValue != null) && pValue.startsWith( "@" ) ? pValue.substring( 1 ) : null;
        }

        protected void setComponentUserValue( Object pComponentValue )
        {
            // todo: translate: mFC.setCurrentValueAsUser( pComponentValue );
        }
    }
}