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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2013 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:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * 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.
 */
// Portions Copyright [2021] [Payara Foundation and/or its affiliates]
package org.glassfish.admin.rest.adapter;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.ServiceConfigurationError;
import org.glassfish.jersey.internal.ServiceFinder;
import org.glassfish.jersey.internal.ServiceFinder.ServiceIteratorProvider;
import org.glassfish.jersey.internal.spi.AutoDiscoverable;

/** Goal of this finder is to be fast and efficient.
 * It is hardcoded implementation.
 *
 * @author martinmares
 */
public class AdminJerseyServiceIteratorProvider extends ServiceIteratorProvider {
    
    private static final Map services = new HashMap();
    static {
//        services.put(ContainerProvider.class.getName(), new String[] { 
//            "org.glassfish.jersey.grizzly2.httpserver.GrizzlyHttpContainerProvider" 
//        });
        services.put(AutoDiscoverable.class.getName(), new String[] { 
//            "org.glassfish.jersey.server.validation.internal.ValidationAutoDiscoverable",
//                "org.glassfish.jersey.jsonp.internal.JsonProcessingAutoDiscoverable",
                "org.glassfish.jersey.server.filter.internal.ServerFiltersAutoDiscoverable",
//                "org.glassfish.jersey.server.wadl.internal.WadlAutoDiscoverable"
        });
//        services.put(ServerComponentProvider.class.getName(), new String[] {
//            "org.glassfish.jersey.gf.cdi.CdiComponentProvider", 
//                "org.glassfish.jersey.gf.ejb.EjbComponentProvider"
//        });
    }
    
    private static final ThreadLocal applyDefinedValues = new ThreadLocal() {
        
        @Override
        protected Boolean initialValue() {
            return Boolean.FALSE;
        }
        
    };
    
    private static final ServiceIteratorProvider defaultProvider = new ServiceFinder.DefaultServiceIteratorProvider();

    public AdminJerseyServiceIteratorProvider() {
        applyDefinedValues.set(Boolean.TRUE);
    }
    
    public void disable() {
        applyDefinedValues.remove();
    }
    
    private String[] getServiceNames(Class service, String serviceName) {
        if (serviceName == null) {
            return services.get(service.getName());
        } else {
            return services.get(serviceName);
        }
    }
    
    @Override
    public  Iterator> createClassIterator(Class service, String serviceName, ClassLoader loader, boolean ignoreOnClassNotFound) {
        final String[] values = getServiceNames(service, serviceName);
        if (!applyDefinedValues.get() || values == null) {
            return defaultProvider.createClassIterator(service, serviceName, loader, ignoreOnClassNotFound);
        } else {
            return new ClassIterator>(services.get(serviceName), loader, ignoreOnClassNotFound);
        }
    }

    @Override
    public  Iterator createIterator(final Class service, final String serviceName, final ClassLoader loader, final boolean ignoreOnClassNotFound) {
        final String[] values = getServiceNames(service, serviceName);
        if (!applyDefinedValues.get() || values == null) {
            return defaultProvider.createIterator(service, serviceName, loader, ignoreOnClassNotFound);
        } else {
            return new Iterator() {

                Iterator> delegate = createClassIterator(service, serviceName, loader, ignoreOnClassNotFound);

                @Override
                public boolean hasNext() {
                    return delegate.hasNext();
                }

                @Override
                public T next() {
                    try {
                        return delegate.next().newInstance();
                    } catch (Exception ex) {
                        throw new ServiceConfigurationError(ex.getLocalizedMessage(), ex);
                    }
                }

                @Override
                public void remove() {
                    delegate.remove();
                }
            };
        }
    }
    
    public static class ClassIterator implements Iterator {
        
        private final String[] names;
        private final ClassLoader classLoader;
        private final boolean ignoreOnClassNotFound;
        
        private int index = -1;
        private String clazzName;
        private T clazz;

        private ClassIterator(String[] names, ClassLoader classLoader, boolean ignoreOnClassNotFound) {
            this.names = names;
            this.classLoader = classLoader;
            this.ignoreOnClassNotFound = ignoreOnClassNotFound;
        }
        
        @Override
        public boolean hasNext() {
            if (clazzName != null) {
                return true;
            }
            if (names == null) {
                return false;
            }
            //Find next index
            while (clazzName == null) {
                if ((++index) >= names.length) {
                    return false;
                }
                clazzName = names[index];
                if (ignoreOnClassNotFound) {
                    try {
                        clazz = (T) Class.forName(clazzName, true, classLoader);
                    } catch (ClassNotFoundException ex) {
                        //Search for next one
                        clazzName = null;
                    }
                }
            }
            return true;
        }

        @Override
        public T next() {
            if (hasNext()) {
                try {
                    if (clazz != null) {
                        return clazz;
                    } else {
                        return (T) Class.forName(clazzName, true, classLoader);
                    }
                } catch (Exception ex) {
                    throw new ServiceConfigurationError(ex.getLocalizedMessage(), ex);
                } finally {
                    clazz = null;
                    clazzName = null;
                }
            } else {
                throw new NoSuchElementException();
            }
        }

        @Override
        public void remove() {
            throw new UnsupportedOperationException();
        }
        
    }
    
}