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/*
 * 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.util.logging.Level;
import java.util.logging.Logger;
import org.jboss.arquillian.core.api.Event;
import org.jboss.arquillian.core.api.Instance;
import org.jboss.arquillian.core.api.annotation.Inject;
import org.jboss.arquillian.core.api.annotation.Observes;
import org.jboss.arquillian.core.spi.ServiceLoader;
import org.jboss.arquillian.drone.spi.Destructor;
import org.jboss.arquillian.drone.spi.DroneContext;
import org.jboss.arquillian.drone.spi.DronePoint;
import org.jboss.arquillian.drone.spi.DroneRegistry;
import org.jboss.arquillian.drone.spi.command.DestroyDrone;
import org.jboss.arquillian.drone.spi.event.AfterDroneDestroyed;
import org.jboss.arquillian.drone.spi.event.BeforeDroneDestroyed;
import org.jboss.arquillian.drone.spi.event.DroneLifecycleEvent;
import org.jboss.arquillian.test.spi.event.suite.After;
import org.jboss.arquillian.test.spi.event.suite.AfterClass;

/**
 * Destructor of Drone instance. Disposes both class scoped Drones as well as method scoped ones.
 * 
 * 

 * Observes:
 * 
 * {@link AfterClass} {@link After}
 * 
 * 

 * Fires:
 * 
 * {@link BeforeDroneDestroyed} {@link AfterDroneDestroyed}
 *
 * @author Karel Piwko
 */
public class DroneDestructor {
    private static final Logger log = Logger.getLogger(DroneDestructor.class.getName());

    @Inject
    private Instance serviceLoader;

    @Inject
    private Instance registry;

    @Inject
    private Event droneLifecycleEvent;

    @Inject
    private Event destroyDroneCommand;

    @Inject
    private Instance droneContext;

    public void destroyDrone(@Observes DestroyDrone command) {
        DroneContext context = droneContext.get();
        DronePoint dronePoint = command.getDronePoint();
        // FIXME this condition might not be valid anymore!
        if (dronePoint == null || !context.contains(dronePoint)) {
            return;
        }

        boolean wasInstantiated = context.get(dronePoint).isInstantiated();
        if (wasInstantiated) {
            Destructor destructor = getDestructorFor(dronePoint.getDroneType());

            droneLifecycleEvent.fire(new BeforeDroneDestroyed(dronePoint));

            // we need to get drone once again, at it might get modified by observers on previous event
            Object drone = context.get(dronePoint).getInstance();

            destructor.destroyInstance(drone);
        }

        if (wasInstantiated) {
            droneLifecycleEvent.fire(new AfterDroneDestroyed(dronePoint));
        }

        context.remove(dronePoint);
    }

    @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().getEntryFor(typeClass, Destructor.class);

        if (log.isLoggable(Level.FINER)) {
            // FIXME possible nullpointerexception?
            log.fine("Using destructor defined in class: " + destructor.getClass().getName() + ", with precedence "
                + destructor.getPrecedence());
        }

        return destructor;
    }
}