// This Source Code is in the Public Domain per: http://litesoft.org/License.txt
package org.litesoft.aokeyhole.objects;

import org.litesoft.aokeyhole.objects.support.*;
import org.litesoft.aokeyhole.persist.*;

public class Property extends AbstractBase
{
    private PropertyMetaData mMetaData;
    private boolean mEditable;
    private Object mValue;

    public Property( PropertyMetaData pMetaData, boolean pEditable )
    {
        mMetaData = pMetaData;
        mEditable = pEditable;
        mValue = pMetaData.getInitialValue();
    }

    public PropertyMetaData getMetaData()
    {
        return mMetaData;
    }

    public boolean isEditable()
    {
        return mEditable;
    }

    public String getName()
    {
        return mMetaData.getName();
    }

    public Object getValue()
    {
        return mValue;
    }

    public String getValueAsString()
    {
        return mMetaData.valueToString( mValue );
    }

    public void unpersistValue( Object pValue )
    {
        updateValue( pValue );
    }

    /**
     * @return true if Value actually changed
     */
    public boolean setValue( Object pValue )
    {
        if ( !mEditable )
        {
            throw new IllegalStateException( getName() + " is Not Editable" );
        }
        return updateValue( pValue );
    }

    /**
     * @return true if Value actually changed
     */
    protected boolean updateValue( Object pValue )
    {
        if ( pValue instanceof String )
        {
            pValue = ((String) pValue).trim();
            if ( "".equals( pValue ) )
            {
                pValue = null;
            }
        }
        if ( areEqual( mValue, pValue ) )
        {
            return false;
        }
        mValue = pValue;
        return true;
    }

    /**
     * @return true if Value actually changed
     */
    public boolean reset()
    {
        return setValue( mMetaData.getInitialValue() );
    }

    public void addTo( PropertyableBuilder pBuilder )
    {
        PropertyMetaData md = getMetaData();
        Object value = getValue();
        if ( !areEqual( md.getInitialValue(), value ) )
        {
            pBuilder.addProperty( getName(), md.valueToString( value ) );
        }
    }

    public void setRehydrated()
    {
    }

    /**
     * @return null or Error
     */
    public String validatePersistable()
    {
        if ( getMetaData().getRequired().isData() && (getValue() == null) )
        {
            return getName() + " is Required";
        }
        return null;
    }

    @Override
    public String toString()
    {
        return "" + getMetaData() + ":" + getValueAsString();
    }
}