/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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.
   */
  
  package org.apache.myfaces.cdi.validator;
  
  import java.lang.reflect.Type;
  
  import javax.enterprise.inject.spi.BeanManager;
  import javax.enterprise.util.TypeLiteral;
  import javax.faces.FacesWrapper;
  import javax.faces.component.PartialStateHolder;
  import javax.faces.component.UIComponent;
  import javax.faces.context.FacesContext;
  import javax.faces.validator.Validator;
  import javax.faces.validator.ValidatorException;
  
  import org.apache.myfaces.cdi.util.CDIUtils;
  
  /**
   *
   */
  public class FacesValidatorCDIWrapper implements PartialStateHolder, Validator, FacesWrapper<Validator>
  {
      private transient Validator delegate;
      
      private String validatorId;
      private boolean _transient;
      private static final Type VALIDATOR_TYPE = new TypeLiteral<Validator<?>>() 
      { 
          private static final long serialVersionUID = 1L; 
      }.getType();
  
      public FacesValidatorCDIWrapper()
      {
      }
  
      public FacesValidatorCDIWrapper(Class<? extends Validator> validatorClass, String validatorId)
      {
          this.validatorId = validatorId;
      }
  
      @Override
      public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException
      {
          getWrapped().validate(context, component, value);
      }
  
      @Override
      public Validator getWrapped()
      {
          if (delegate == null)
          {
              BeanManager  beanManager = CDIUtils.getBeanManager(FacesContext.getCurrentInstance().getExternalContext());
              FacesValidatorAnnotationLiteral qualifier = new FacesValidatorAnnotationLiteral(validatorId, false, true);
  
              delegate = (Validator) CDIUtils.getInstance(beanManager,VALIDATOR_TYPE, true, qualifier);
   
              if(delegate == null)
              {
                  delegate = (Validator) CDIUtils.getInstance(beanManager, Validator.class, true, qualifier);
              }
          }
          return delegate;
      }
      
      @Override
      public Object saveState(FacesContext context)
      {
          if (!initialStateMarked())
          {
              Object values[] = new Object[1];
              values[0] = validatorId;
              return values;
          }
          return null;
      }
  
      @Override
      public void restoreState(FacesContext context, Object state)
      {
          if (state != null)
          {
              Object values[] = (Object[])state;
             validatorId = (String)values[0];
         }
     }
 
     @Override
     public boolean isTransient()
     {
         return _transient;
     }
 
     @Override
     public void setTransient(boolean newTransientValue)
     {
         _transient = newTransientValue;
     }
 
     private boolean _initialStateMarked = false;
 
     public void clearInitialState()
     {
         _initialStateMarked = false;
     }
 
     public boolean initialStateMarked()
     {
         return _initialStateMarked;
     }
 
     public void markInitialState()
     {
         _initialStateMarked = true;
     }
 
 }