/*
 * JBoss, Home of Professional Open Source
 * Copyright 2010, Red Hat Middleware LLC, and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * 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.
 */
package org.jboss.arquillian.drone.impl;

import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.logging.Level;
import java.util.logging.Logger;

import org.jboss.arquillian.drone.annotation.Drone;
import org.jboss.arquillian.drone.spi.Destructor;
import org.jboss.arquillian.spi.core.Instance;
import org.jboss.arquillian.spi.core.annotation.Inject;
import org.jboss.arquillian.spi.core.annotation.Observes;
import org.jboss.arquillian.spi.event.suite.After;
import org.jboss.arquillian.spi.event.suite.AfterClass;
import org.jboss.arquillian.spi.util.Validate;

/**
 * Destructor of drone instances. Disposes instance of every field annotated
 * with {@link Drone}. Disposes Drones created for method arguments as well.
 * 
 * <p>
 * Consumes:
 * </p>
 * <ol>
 * <li>{@link DroneContext}</li>
 * <li>{@link DroneRegistry}</li>
 * <li>{@link MethodContext}</li>
 * </ol>
 * 
 * <p>
 * Observes:
 * </p>
 * <ol>
 * <li>{@link After}</li>
 * <li>{@link AfterClass}</li>
 * </ol>
 * 
 * @author <a href="kpiwko@redhat.com>Karel Piwko</a>
 * 
 */
public class DroneDestructor
{
   private static final Logger log = Logger.getLogger(DroneDestructor.class.getName());

   @Inject
   private Instance<DroneRegistry> registry;

   @Inject
   private Instance<DroneContext> droneContext;

   @Inject
   private Instance<MethodContext> methodContext;

   @SuppressWarnings("unchecked")
   public void destroyClassScopedDrone(@Observes AfterClass event)
   {
      Class<?> clazz = event.getTestClass().getJavaClass();
      for (Field f : SecurityActions.getFieldsWithAnnotation(clazz, Drone.class))
      {
         Class<?> typeClass = f.getType();
         Class<? extends Annotation> qualifier = SecurityActions.getQualifier(f);

         @SuppressWarnings("rawtypes")
         Destructor destructor = getDestructorFor(typeClass);         
         destructor.destroyInstance(droneContext.get().get(typeClass, qualifier));
         droneContext.get().remove(typeClass, qualifier);
      }
   }

   @SuppressWarnings("unchecked")
   public void destroyMethodScopedDrone(@Observes After event)
   {
      Method method = event.getTestMethod();
      Class<?>[] parameterTypes = method.getParameterTypes();
      Annotation[][] parameterAnnotations = method.getParameterAnnotations();

      for (int i = 0; i < parameterTypes.length; i++)
      {
         if (SecurityActions.isAnnotationPresent(parameterAnnotations[i], Drone.class))
         {
            Validate.notNull(methodContext.get(), "Drone registry should not be null");
            Class<? extends Annotation> qualifier = SecurityActions.getQualifier(parameterAnnotations[i]);

            @SuppressWarnings("rawtypes")
            Destructor destructor = getDestructorFor(parameterTypes[i]);

            DroneContext context = methodContext.get().get(method);
            Validate.notNull(context, "Method context should not be null");
            
            destructor.destroyInstance(context.get(parameterTypes[i], qualifier));
            context.remove(parameterTypes[i], qualifier);
         }
      }

   }

   @SuppressWarnings("rawtypes")
   private Destructor getDestructorFor(Class<?> typeClass)
   {
      // must be defined as raw because instance type to be destroyer cannot
      // be determined in compile time
      Destructor destructor = registry.get().getDestructorFor(typeClass);
      if (destructor == null)
      {
         throw new IllegalArgumentException("No destructor was found for object of type " + typeClass.getName());
      }
      if (log.isLoggable(Level.FINE))
      {
         log.fine("Using destructor defined in class: " + destructor.getClass().getName() + ", with precedence " + destructor.getPrecedence());
      }

      return destructor;
   }

}