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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2012-2017 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package org.jvnet.hk2.internal;

import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;

import org.glassfish.hk2.api.ActiveDescriptor;
import org.glassfish.hk2.api.Context;
import org.glassfish.hk2.api.Injectee;
import org.glassfish.hk2.api.PerLookup;
import org.glassfish.hk2.api.ServiceHandle;
import org.glassfish.hk2.utilities.reflection.ReflectionHelper;

/**
 * This handle does the underlying work of getting the service.  Only
 * at the time that the getService call is made is the service gotten
 * from the context.  Once a service has been gotten, it is not looked
 * up again.
 * 
 * @author jwells
 * @param  The type of service to create
 *
 */
public class ServiceHandleImpl implements ServiceHandle {
    private ActiveDescriptor root;
    private final ServiceLocatorImpl locator;
    private final LinkedList injectees = new LinkedList();
    private final Object lock = new Object();
    
    private boolean serviceDestroyed = false;
    private boolean serviceSet = false;
    private T service;
    private Object serviceData;
    
    private final LinkedList> subHandles = new LinkedList>();
    
    /* package */ ServiceHandleImpl(ServiceLocatorImpl locator, ActiveDescriptor root, Injectee injectee) {
        this.root = root;
        this.locator = locator;
        if (injectee != null) {
            injectees.add(injectee);
        }
    }

    /* (non-Javadoc)
     * @see org.glassfish.hk2.api.ServiceHandle#getService()
     */
    @Override
    public T getService() {
        return getService(this);
    }
    
    private Injectee getLastInjectee() {
        synchronized (lock) {
            return (injectees.isEmpty()) ? null : injectees.getLast() ;
        }
    }
    
    /* package */ T getService(ServiceHandle handle) {
        if (root instanceof Closeable) {
            Closeable closeable = (Closeable) root;
            if (closeable.isClosed()) {
                throw new IllegalStateException("This service has been unbound: " + root);
            }
        }
        
        synchronized (lock) {
            if (serviceDestroyed) throw new IllegalStateException("Service has been disposed");
            
            if (serviceSet) return service;
            
            Injectee injectee = getLastInjectee();
            
            Class requiredClass = (injectee == null) ? null : ReflectionHelper.getRawClass(injectee.getRequiredType());
            
            service = Utilities.createService(root, injectee, locator, handle, requiredClass);
            
            serviceSet = true;
        
            return service;
        }
        
    }

    /* (non-Javadoc)
     * @see org.glassfish.hk2.api.ServiceHandle#getActiveDescriptor()
     */
    @Override
    public ActiveDescriptor getActiveDescriptor() {
        return root;
    }

    /* (non-Javadoc)
     * @see org.glassfish.hk2.api.ServiceHandle#isActive()
     */
    @Override
    public boolean isActive() {
        // No lock needed, nothing changes state
        if (serviceDestroyed) return false;
        if (serviceSet) return true;
        
        try {
            Context context = locator.resolveContext(root.getScopeAnnotation());
            return context.containsKey(root);
        }
        catch (IllegalStateException ise) {
            return false;
        }
    }

    /* (non-Javadoc)
     * @see org.glassfish.hk2.api.ServiceHandle#destroy()
     */
    @Override
    public void destroy() {
        boolean localServiceSet;
        boolean serviceActive;
        
        if (!root.isReified()) return;
        
        List> localSubHandles;
        synchronized (lock) {
            serviceActive = isActive();
            
            if (serviceDestroyed) return;
            serviceDestroyed = true;
            
            localServiceSet = serviceSet;
            
            localSubHandles = new ArrayList>(subHandles);
            subHandles.clear();
        }
        
        if (root.getScopeAnnotation().equals(PerLookup.class)) {
            if (localServiceSet) {
                // Otherwise it is the scope responsible for the lifecycle
                root.dispose(service);
            }
        }
        else if (serviceActive) {
            Context context;
            try {
                context = locator.resolveContext(root.getScopeAnnotation());
            }
            catch (Throwable th) {
                return;
            }
            
            context.destroyOne(root);
        }
        
        for (ServiceHandleImpl subHandle : localSubHandles) {
            subHandle.destroy();
        }
        

    }
    
    @Override
    public void setServiceData(Object serviceData) {
        synchronized (lock) {
            this.serviceData = serviceData;
        }
        
    }

    @Override
    public Object getServiceData() {
        synchronized (lock) {
            return serviceData;
        }
    }
    
    @Override
    public List> getSubHandles() {
        synchronized (lock) {
            return new ArrayList>(subHandles);
        }
    }
    
    public void pushInjectee(Injectee push) {
        synchronized (lock) {
            injectees.add(push);
        }
    }
    
    public void popInjectee() {
        synchronized (lock) {
            injectees.removeLast();
        }
    }
    
    /**
     * Add a sub handle to this for proper destruction
     * 
     * @param subHandle A handle to add for proper destruction
     */
    public void addSubHandle(ServiceHandleImpl subHandle) {
        synchronized (lock) {
            subHandles.add(subHandle);
        }
    }
    
    public Injectee getOriginalRequest() {
        Injectee injectee = getLastInjectee();
        return injectee;
    }
    
    public String toString() {
        return "ServiceHandle(" + root + "," + System.identityHashCode(this) + ")"; 
    }

    
}