/*******************************************************************************
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 *
 * Contributors:
 *      Gregory Amerson - initial implementation and ongoing maintenance
 *******************************************************************************/

package com.liferay.ide.hook.core.model.internal;

import com.liferay.ide.hook.core.model.BeforeAfterFilterType;

import org.eclipse.sapphire.Property;
import org.eclipse.sapphire.modeling.annotations.DefaultValue;
import org.eclipse.sapphire.modeling.xml.XmlElement;
import org.eclipse.sapphire.modeling.xml.XmlValueBindingImpl;

/**
 * @author Gregory Amerson
 */
public class BeforeAfterFilterTypeBinding extends XmlValueBindingImpl
{

    private String defaultValueText;
    private String localValue;

    @Override
    public void init( Property property )
    {
        super.init( property );

        DefaultValue defaultValue = property.definition().getAnnotation( DefaultValue.class );

        this.defaultValueText = defaultValue.text();
    }

    @Override
    public String read()
    {
        // check for existence of before-filter or after-filter elements, if neither exist, then return default value

        XmlElement xmlElement = xml();

        XmlElement beforeFilterElement =
            xmlElement.getChildElement( BeforeAfterFilterType.BEFORE_FILTER.getText(), false );

        if( beforeFilterElement != null )
        {
            return BeforeAfterFilterType.BEFORE_FILTER.getText();
        }

        XmlElement afterFilterElement =
            xmlElement.getChildElement( BeforeAfterFilterType.AFTER_FILTER.getText(), false );

        if( afterFilterElement != null )
        {
            return BeforeAfterFilterType.AFTER_FILTER.getText();
        }

        if( this.localValue != null )
        {
            return this.localValue;
        }

        return this.defaultValueText;
    }

    @Override
    public void write( String value )
    {
        XmlElement xmlElement = xml();

        XmlElement filterElement = xmlElement.getChildElement( BeforeAfterFilterType.BEFORE_FILTER.getText(), false );

        if( filterElement == null )
        {
            filterElement = xmlElement.getChildElement( BeforeAfterFilterType.AFTER_FILTER.getText(), false );
        }

        String existingFilterValue = null;

        if( filterElement != null )
        {
            existingFilterValue = filterElement.getText();

            filterElement.remove();

            XmlElement newElement = xmlElement.getChildElement( value, true );

            newElement.setText( existingFilterValue );
        }
        else
        {
            this.localValue = value;
        }

    }

}