/*
 * Copyright The WildFly Authors
 * SPDX-License-Identifier: Apache-2.0
 */
package org.wildfly.extension.clustering.server.dispatcher;

import java.time.Duration;
import java.util.AbstractMap;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.function.Supplier;

import org.jboss.as.clustering.controller.CapabilityServiceConfigurator;
import org.jboss.as.controller.capability.CapabilityServiceSupport;
import org.jboss.as.server.Services;
import org.jboss.marshalling.ClassResolver;
import org.jboss.marshalling.MarshallingConfiguration;
import org.jboss.marshalling.ModularClassResolver;
import org.jboss.modules.Module;
import org.jboss.modules.ModuleLoader;
import org.jboss.msc.Service;
import org.jboss.msc.service.ServiceBuilder;
import org.jboss.msc.service.ServiceController;
import org.jboss.msc.service.ServiceName;
import org.jboss.msc.service.ServiceTarget;
import org.jgroups.JChannel;
import org.jgroups.Message;
import org.wildfly.clustering.dispatcher.CommandDispatcherFactory;
import org.wildfly.clustering.jgroups.spi.ChannelFactory;
import org.wildfly.clustering.jgroups.spi.JGroupsRequirement;
import org.wildfly.clustering.marshalling.jboss.DynamicClassTable;
import org.wildfly.clustering.marshalling.jboss.DynamicExternalizerObjectTable;
import org.wildfly.clustering.marshalling.jboss.JBossByteBufferMarshaller;
import org.wildfly.clustering.marshalling.jboss.SimpleMarshallingConfigurationRepository;
import org.wildfly.clustering.marshalling.protostream.ModuleClassLoaderMarshaller;
import org.wildfly.clustering.marshalling.protostream.ProtoStreamByteBufferMarshaller;
import org.wildfly.clustering.marshalling.protostream.SerializationContextBuilder;
import org.wildfly.clustering.marshalling.spi.ByteBufferMarshaller;
import org.wildfly.clustering.server.infinispan.dispatcher.AutoCloseableCommandDispatcherFactory;
import org.wildfly.clustering.server.infinispan.dispatcher.ChannelCommandDispatcherFactory;
import org.wildfly.clustering.server.infinispan.dispatcher.ChannelCommandDispatcherFactoryConfiguration;
import org.wildfly.clustering.service.AsyncServiceConfigurator;
import org.wildfly.clustering.service.CompositeDependency;
import org.wildfly.clustering.service.FunctionalService;
import org.wildfly.clustering.service.ServiceConfigurator;
import org.wildfly.clustering.service.ServiceSupplierDependency;
import org.wildfly.clustering.service.SimpleServiceNameProvider;
import org.wildfly.clustering.service.SupplierDependency;
import org.wildfly.common.function.Functions;
import org.wildfly.security.manager.WildFlySecurityManager;

/**
 * Builds a channel-based {@link org.wildfly.clustering.dispatcher.CommandDispatcherFactory} service.
 * @author Paul Ferraro
 */
public class ChannelCommandDispatcherFactoryServiceConfigurator extends SimpleServiceNameProvider implements CapabilityServiceConfigurator, ChannelCommandDispatcherFactoryConfiguration, Supplier<AutoCloseableCommandDispatcherFactory>, Function<ClassLoader, ByteBufferMarshaller>, Predicate<Message> {

    enum MarshallingVersion implements Function<Map.Entry<ClassResolver, ClassLoader>, MarshallingConfiguration> {
        VERSION_1() {
            @Override
            public MarshallingConfiguration apply(Map.Entry<ClassResolver, ClassLoader> entry) {
                MarshallingConfiguration config = new MarshallingConfiguration();
                ClassLoader userLoader = entry.getValue();
                ClassLoader loader = WildFlySecurityManager.getClassLoaderPrivileged(ChannelCommandDispatcherFactory.class);
                List<ClassLoader> loaders = userLoader.equals(loader) ? List.of(userLoader) : List.of(userLoader, loader);
                config.setClassResolver(entry.getKey());
                config.setClassTable(new DynamicClassTable(loaders));
                config.setObjectTable(new DynamicExternalizerObjectTable(loaders));
                return config;
            }
        },
        ;
        static final MarshallingVersion CURRENT = VERSION_1;
    }

    private final String group;

    private volatile SupplierDependency<ChannelFactory> channelFactory;
    private volatile SupplierDependency<JChannel> channel;
    private volatile SupplierDependency<Module> module;
    private volatile Supplier<ModuleLoader> loader;
    private volatile Duration timeout = Duration.ofMinutes(1);

    public ChannelCommandDispatcherFactoryServiceConfigurator(ServiceName name, String group) {
        super(name);
        this.group = group;
    }

    @Override
    public AutoCloseableCommandDispatcherFactory get() {
        return new ChannelCommandDispatcherFactory(this);
    }

    @Override
    public ServiceConfigurator configure(CapabilityServiceSupport support) {
        this.channel = new ServiceSupplierDependency<>(JGroupsRequirement.CHANNEL.getServiceName(support, this.group));
        this.channelFactory = new ServiceSupplierDependency<>(JGroupsRequirement.CHANNEL_SOURCE.getServiceName(support, this.group));
        this.module = new ServiceSupplierDependency<>(JGroupsRequirement.CHANNEL_MODULE.getServiceName(support, this.group));
        return this;
    }

    @Override
    public ServiceBuilder<?> build(ServiceTarget target) {
        ServiceBuilder<?> builder = new AsyncServiceConfigurator(this.getServiceName()).build(target);
        this.loader = builder.requires(Services.JBOSS_SERVICE_MODULE_LOADER);
        Consumer<CommandDispatcherFactory> factory = new CompositeDependency(this.channel, this.channelFactory, this.module).register(builder).provides(this.getServiceName());
        Service service = new FunctionalService<>(factory, Functions.cast(Function.identity()), this, Functions.closingConsumer());
        return builder.setInstance(service).setInitialMode(ServiceController.Mode.PASSIVE);
    }

    public ChannelCommandDispatcherFactoryServiceConfigurator timeout(Duration timeout) {
        this.timeout = timeout;
        return this;
    }

    @Override
    public Function<ClassLoader, ByteBufferMarshaller> getMarshallerFactory() {
        return this;
    }

    @Override
    public ByteBufferMarshaller apply(ClassLoader loader) {
        ModuleLoader moduleLoader = this.loader.get();
        try {
            return new ProtoStreamByteBufferMarshaller(new SerializationContextBuilder(new ModuleClassLoaderMarshaller(moduleLoader)).require(loader).build());
        } catch (NoSuchElementException e) {
            return new JBossByteBufferMarshaller(new SimpleMarshallingConfigurationRepository(MarshallingVersion.class, MarshallingVersion.CURRENT, new AbstractMap.SimpleImmutableEntry<>(ModularClassResolver.getInstance(moduleLoader), loader)), loader);
        }
    }

    @Override
    public JChannel getChannel() {
        return this.channel.get();
    }

    @Override
    public ByteBufferMarshaller getMarshaller() {
        return new ProtoStreamByteBufferMarshaller(new SerializationContextBuilder(new ModuleClassLoaderMarshaller(this.loader.get())).load(this.module.get().getClassLoader()).build());
    }

    @Override
    public Duration getTimeout() {
        return this.timeout;
    }

    @Override
    public Predicate<Message> getUnknownForkPredicate() {
        return this;
    }

    @Override
    public boolean test(Message response) {
        return this.channelFactory.get().isUnknownForkResponse(response);
    }
}
