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/***********************************************************************************************************************
 *
 * blueMarine Metadata - open source media workflow
 * Copyright (C) 2007-2011 by Tidalwave s.a.s. (http://www.tidalwave.it)
 *
 ***********************************************************************************************************************
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations under the License.
 *
 ***********************************************************************************************************************
 *
 * WWW: http://bluemarine.tidalwave.it
 * SCM: https://kenai.com/hg/bluemarine~metadata-src
 *
 **********************************************************************************************************************/
package it.tidalwave.metadata.persistence.spi;

import javax.annotation.CheckForNull;
import javax.annotation.Nonnull;
import java.lang.reflect.Method;
import java.beans.IntrospectionException;
import java.beans.PropertyDescriptor;
import java.util.ArrayList;
import java.util.List;
import org.jdesktop.beansbinding.Property;
import it.tidalwave.beans.FastBeanProperty;

/*******************************************************************************
 *
 * @author  Fabrizio Giudici
 * @version $Id$
 *
 ******************************************************************************/
public class MistralBeanAccessor extends IntrospectionBeanAccessor
  {
    /***************************************************************************
     * 
     * Creates this object passing the class of the represented item and the name
     * of the property set.
     * 
     * @param  itemClass        the class of the represented item
     * @param  propertySetName  the name of the property set
     * 
     **************************************************************************/
    public MistralBeanAccessor (@Nonnull final Class beanClass, @Nonnull final String propertySetName)
      {
        super(beanClass, propertySetName);
      }
    
    /***************************************************************************
     *
     * {@inheritDoc}. The returned properties are those discoverable by 
     * introspection, for which {@link #isPersistent(String)} returns true and
     * having a sister property isXXXAvailable whose value is 
     * true.
     * 
     **************************************************************************/
    @Nonnull 
    public List getPersistentPropertyNames (@Nonnull final T item) 
      {
        final List result = new ArrayList();
        
        try
          { 
            for (final PropertyDescriptor descriptor : findPropertyDescriptors(item)) 
              {
                final String propertyName = descriptor.getName();

                if (!propertyName.endsWith("Available") && isPersistent(propertyName)) 
                  {
                    final Property availabilityProperty = FastBeanProperty.create(propertyName + "Available");

                    if (availabilityProperty.isReadable(item) && (Boolean)availabilityProperty.getValue(item)) 
                      {
                        result.add(propertyName);
                      }
                  }
              }
          }
        catch (IntrospectionException e)
          {
            e.printStackTrace(); //  FIXME: use Logger
          }
        
        return result;
      }
    
    /***************************************************************************
     *
     * {@inheritDoc}. This method provides support for enumeration types by
     * returning Integer.class for them.
     * 
     **************************************************************************/
    @Override
    @Nonnull 
    public Class getDefaultPropertyType (@Nonnull final String propertyName)
      throws UnknownPropertyException
      {
        if (propertyName == null)
          {
            throw new IllegalArgumentException("propertyName is mandatory");
          }
        
        final Class type = super.getDefaultPropertyType(propertyName);
        return type.isEnum() ? Integer.class : type;
      }

    /***************************************************************************
     *
     * {@inheritDoc}. This method provides for converting enumeration types by
     * calling the static method getValue().
     * 
     **************************************************************************/
    @Override
    @CheckForNull
    public Object convertValueToPersistence (@Nonnull final String propertyName, 
                                             @CheckForNull final Object value)
      throws UnknownPropertyException
      {
        final Class type = super.getDefaultPropertyType(propertyName);
        
        if (!type.isEnum())
          {
            return value;  
          }
        else
          {
            try 
              {
                final Method method = type.getMethod("getValue");
                return method.invoke(value);
              }
            catch (Exception e)
              {
                throw new RuntimeException(e);
              }
          }
      }

    /***************************************************************************
     *
     * {@inheritDoc}. This method provides for converting enumeration types by
     * calling the static method fromInteger().
     * 
     **************************************************************************/
    @Override
    @CheckForNull
    public Object convertValueFromPersistence (@Nonnull final String propertyName, 
                                               @CheckForNull Object value) 
      throws UnknownPropertyException
      {
        final Class type = super.getDefaultPropertyType(propertyName);
        
        if (!type.isEnum())
          {
            return value;
          }
        else
          {
            if (!value.getClass().equals(Integer.class))
              {
                value = Integer.valueOf(((Number)value).intValue());
                System.err.println(String.format("Property %s, enum type is not Integer: %s", propertyName, value.getClass()));
              }
            
            try 
              {
                final Method method = type.getMethod("fromInteger", int.class);
                return method.invoke(null, value);  
              }
            catch (RuntimeException e)
              {
                throw e;
              }
            catch (Exception e)
              {
                throw new RuntimeException(e);
              }
          }
      }
    
    /***************************************************************************
     *
     * {@inheritDoc}.
     * 
     **************************************************************************/
    @Override
    @Nonnull
    public String toString()
      {
        return String.format("MistralBeanAccessor[%s]", getPropertySetName());
      }
  }