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package org.glassfish.jersey.client;

import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

import javax.ws.rs.RuntimeType;
import javax.ws.rs.core.Configurable;
import javax.ws.rs.core.Configuration;
import javax.ws.rs.core.Feature;

import org.glassfish.jersey.CommonProperties;
import org.glassfish.jersey.ExtendedConfig;
import org.glassfish.jersey.client.internal.LocalizationMessages;
import org.glassfish.jersey.client.spi.Connector;
import org.glassfish.jersey.client.spi.ConnectorProvider;
import org.glassfish.jersey.internal.ServiceFinder;
import org.glassfish.jersey.internal.inject.Injections;
import org.glassfish.jersey.internal.inject.JerseyClassAnalyzer;
import org.glassfish.jersey.internal.inject.ProviderBinder;
import org.glassfish.jersey.internal.util.collection.LazyValue;
import org.glassfish.jersey.internal.util.collection.Value;
import org.glassfish.jersey.internal.util.collection.Values;
import org.glassfish.jersey.model.internal.CommonConfig;
import org.glassfish.jersey.model.internal.ComponentBag;
import org.glassfish.jersey.process.internal.ExecutorProviders;

import org.glassfish.hk2.api.DynamicConfiguration;
import org.glassfish.hk2.api.ServiceLocator;
import org.glassfish.hk2.utilities.binding.AbstractBinder;

/**
 * Jersey externalized implementation of client-side JAX-RS {@link javax.ws.rs.core.Configurable
 * configurable} contract.
 *
 * @author Marek Potociar (marek.potociar at oracle.com)
 * @author Martin Matula
 * @author Libor Kramolis (libor.kramolis at oracle.com)
 */
public class ClientConfig implements Configurable, ExtendedConfig {
    /**
     * Internal configuration state.
     */
    private State state;

    /**
     * Default encapsulation of the internal configuration state.
     */
    private static class State implements Configurable, ExtendedConfig {

        /**
         * Strategy that returns the same state instance.
         */
        private static final StateChangeStrategy IDENTITY = new StateChangeStrategy() {

            @Override
            public State onChange(final State state) {
                return state;
            }
        };
        /**
         * Strategy that returns a copy of the state instance.
         */
        private static final StateChangeStrategy COPY_ON_CHANGE = new StateChangeStrategy() {

            @Override
            public State onChange(final State state) {
                return state.copy();
            }
        };

        private volatile StateChangeStrategy strategy;
        private final CommonConfig commonConfig;
        private final JerseyClient client;
        private volatile ConnectorProvider connectorProvider;


        private final LazyValue runtime = Values.lazy(new Value() {
            @Override
            public ClientRuntime get() {
                return initRuntime();
            }
        });

        /**
         * Configuration state change strategy.
         */
        private static interface StateChangeStrategy {

            /**
             * Invoked whenever a mutator method is called in the given configuration
             * state.
             *
             * @param state configuration state to be mutated.
             * @return state instance that will be mutated and returned from the
             * invoked configuration state mutator method.
             */
            public State onChange(final State state);
        }

        /**
         * Default configuration state constructor with {@link StateChangeStrategy "identity"}
         * state change strategy.
         *
         * @param client bound parent Jersey client.
         */
        State(final JerseyClient client) {
            this.strategy = IDENTITY;
            this.commonConfig = new CommonConfig(RuntimeType.CLIENT, ComponentBag.EXCLUDE_EMPTY);
            this.client = client;
            final Iterator iterator = ServiceFinder.find(ConnectorProvider.class).iterator();
            if (iterator.hasNext()) {
                this.connectorProvider = iterator.next();
            } else {
                this.connectorProvider = new HttpUrlConnectorProvider();
            }
        }

        /**
         * Copy the original configuration state while using the default state change
         * strategy.
         *
         * @param client   new Jersey client parent for the state.
         * @param original configuration strategy to be copied.
         */
        private State(final JerseyClient client, final State original) {
            this.strategy = IDENTITY;
            this.client = client;
            this.commonConfig = new CommonConfig(original.commonConfig);
            this.connectorProvider = original.connectorProvider;
        }

        /**
         * Create a copy of the configuration state within the same parent Jersey
         * client instance scope.
         *
         * @return configuration state copy.
         */
        State copy() {
            return new State(this.client, this);
        }

        /**
         * Create a copy of the configuration state in a scope of the given
         * parent Jersey client instance.
         *
         * @param client parent Jersey client instance.
         * @return configuration state copy.
         */
        State copy(final JerseyClient client) {
            return new State(client, this);
        }

        void markAsShared() {
            strategy = COPY_ON_CHANGE;
        }

        State preInitialize() {
            final State state = strategy.onChange(this);
            state.strategy = COPY_ON_CHANGE;
            state.runtime.get().preInitialize();
            return state;

        }

        @Override
        public State property(final String name, final Object value) {
            final State state = strategy.onChange(this);
            state.commonConfig.property(name, value);
            return state;
        }

        public State loadFrom(final Configuration config) {
            final State state = strategy.onChange(this);
            state.commonConfig.loadFrom(config);
            return state;
        }

        @Override
        public State register(final Class providerClass) {
            final State state = strategy.onChange(this);
            state.commonConfig.register(providerClass);
            return state;
        }

        @Override
        public State register(final Object provider) {
            final State state = strategy.onChange(this);
            state.commonConfig.register(provider);
            return state;
        }

        @Override
        public State register(final Class providerClass, final int bindingPriority) {
            final State state = strategy.onChange(this);
            state.commonConfig.register(providerClass, bindingPriority);
            return state;
        }

        @Override
        public State register(final Class providerClass, final Class... contracts) {
            final State state = strategy.onChange(this);
            state.commonConfig.register(providerClass, contracts);
            return state;
        }

        @Override
        public State register(final Class providerClass, final Map, Integer> contracts) {
            final State state = strategy.onChange(this);
            state.commonConfig.register(providerClass, contracts);
            return state;
        }

        @Override
        public State register(final Object provider, final int bindingPriority) {
            final State state = strategy.onChange(this);
            state.commonConfig.register(provider, bindingPriority);
            return state;
        }

        @Override
        public State register(final Object provider, final Class... contracts) {
            final State state = strategy.onChange(this);
            state.commonConfig.register(provider, contracts);
            return state;
        }

        @Override
        public State register(final Object provider, final Map, Integer> contracts) {
            final State state = strategy.onChange(this);
            state.commonConfig.register(provider, contracts);
            return state;
        }

        State connectorProvider(final ConnectorProvider provider) {
            if (provider == null) {
                throw new NullPointerException(LocalizationMessages.NULL_CONNECTOR_PROVIDER());
            }
            final State state = strategy.onChange(this);
            state.connectorProvider = provider;
            return state;
        }

        Connector getConnector() {
            // Get the connector only if the runtime has been initialized.
            return (runtime.isInitialized()) ? runtime.get().getConnector() : null;
        }

        ConnectorProvider getConnectorProvider() {
            return connectorProvider;
        }

        JerseyClient getClient() {
            return client;
        }

        @Override
        public State getConfiguration() {
            return this;
        }

        @Override
        public RuntimeType getRuntimeType() {
            return commonConfig.getConfiguration().getRuntimeType();
        }

        @Override
        public Map getProperties() {
            return commonConfig.getConfiguration().getProperties();
        }

        @Override
        public Object getProperty(final String name) {
            return commonConfig.getConfiguration().getProperty(name);
        }

        @Override
        public Collection getPropertyNames() {
            return commonConfig.getConfiguration().getPropertyNames();
        }

        @Override
        public boolean isProperty(final String name) {
            return commonConfig.getConfiguration().isProperty(name);
        }

        @Override
        public boolean isEnabled(final Feature feature) {
            return commonConfig.getConfiguration().isEnabled(feature);
        }

        @Override
        public boolean isEnabled(final Class featureClass) {
            return commonConfig.getConfiguration().isEnabled(featureClass);
        }

        @Override
        public boolean isRegistered(final Object component) {
            return commonConfig.getConfiguration().isRegistered(component);
        }

        @Override
        public boolean isRegistered(final Class componentClass) {
            return commonConfig.getConfiguration().isRegistered(componentClass);
        }

        @Override
        public Map, Integer> getContracts(final Class componentClass) {
            return commonConfig.getConfiguration().getContracts(componentClass);
        }

        @Override
        public Set> getClasses() {
            return commonConfig.getConfiguration().getClasses();
        }

        @Override
        public Set getInstances() {
            return commonConfig.getConfiguration().getInstances();
        }

        public void configureAutoDiscoverableProviders(final ServiceLocator locator) {
            commonConfig.configureAutoDiscoverableProviders(locator, false);
        }

        public void configureForcedAutoDiscoverableProviders(final ServiceLocator locator) {
            commonConfig.configureAutoDiscoverableProviders(locator, true);
        }

        public void configureMetaProviders(final ServiceLocator locator) {
            commonConfig.configureMetaProviders(locator);
        }

        public ComponentBag getComponentBag() {
            return commonConfig.getComponentBag();
        }

        /**
         * Initialize the newly constructed client instance.
         */
        @SuppressWarnings("MethodOnlyUsedFromInnerClass")
        private ClientRuntime initRuntime() {
            /**
             * Ensure that any attempt to add a new provider, feature, binder or modify the connector
             * will cause a copy of the current state.
             */
            markAsShared();

            final State runtimeCfgState = this.copy();
            runtimeCfgState.markAsShared();

            final ServiceLocator locator = Injections.createLocator(new ClientBinder(runtimeCfgState.getProperties()));
            locator.setDefaultClassAnalyzerName(JerseyClassAnalyzer.NAME);

            // AutoDiscoverable.
            if (!CommonProperties.getValue(runtimeCfgState.getProperties(), RuntimeType.CLIENT,
                    CommonProperties.FEATURE_AUTO_DISCOVERY_DISABLE, Boolean.FALSE, Boolean.class)) {
                runtimeCfgState.configureAutoDiscoverableProviders(locator);
            } else {
                runtimeCfgState.configureForcedAutoDiscoverableProviders(locator);
            }

            // Configure binders and features.
            runtimeCfgState.configureMetaProviders(locator);

            // Bind configuration.
            final AbstractBinder configBinder = new AbstractBinder() {
                @Override
                protected void configure() {
                    bind(runtimeCfgState).to(Configuration.class);
                }
            };
            final DynamicConfiguration dc = Injections.getConfiguration(locator);
            configBinder.bind(dc);
            dc.commit();

            // Bind providers.
            ProviderBinder.bindProviders(runtimeCfgState.getComponentBag(), RuntimeType.CLIENT, null, locator);

            // Bind executors.
            ExecutorProviders.createInjectionBindings(locator);

            final ClientConfig configuration = new ClientConfig(runtimeCfgState);
            final Connector connector = connectorProvider.getConnector(client, configuration);
            final ClientRuntime crt = new ClientRuntime(configuration, connector, locator);

            client.registerShutdownHook(crt);

            return crt;
        }

        @Override
        public boolean equals(final Object o) {
            if (this == o) {
                return true;
            }
            if (o == null || getClass() != o.getClass()) {
                return false;
            }

            final State state = (State) o;

            if (client != null ? !client.equals(state.client) : state.client != null) {
                return false;
            }
            if (!commonConfig.equals(state.commonConfig)) {
                return false;
            }
            return connectorProvider == null ? state.connectorProvider == null
                    : connectorProvider.equals(state.connectorProvider);
        }

        @Override
        public int hashCode() {
            int result = commonConfig.hashCode();
            result = 31 * result + (client != null ? client.hashCode() : 0);
            result = 31 * result + (connectorProvider != null ? connectorProvider.hashCode() : 0);
            return result;
        }
    }

    /**
     * Construct a new Jersey configuration instance with the default features
     * and property values.
     */
    public ClientConfig() {
        this.state = new State(null);
    }

    /**
     * Construct a new Jersey configuration instance and register the provided list of provider classes.
     *
     * @param providerClasses provider classes to be registered with this client configuration.
     */
    public ClientConfig(final Class... providerClasses) {
        this();
        for (final Class providerClass : providerClasses) {
            state.register(providerClass);
        }
    }

    /**
     * Construct a new Jersey configuration instance and register the provided list of provider instances.
     *
     * @param providers provider instances to be registered with this client configuration.
     */
    public ClientConfig(final Object... providers) {
        this();
        for (final Object provider : providers) {
            state.register(provider);
        }
    }

    /**
     * Construct a new Jersey configuration instance with the features as well as
     * property values copied from the supplied JAX-RS configuration instance.
     *
     * @param parent parent Jersey client instance.
     */
    ClientConfig(final JerseyClient parent) {
        this.state = new State(parent);
    }

    /**
     * Construct a new Jersey configuration instance with the features as well as
     * property values copied from the supplied JAX-RS configuration instance.
     *
     * @param parent parent Jersey client instance.
     * @param that   original {@link javax.ws.rs.core.Configuration}.
     */
    ClientConfig(final JerseyClient parent, final Configuration that) {
        if (that instanceof ClientConfig) {
            state = ((ClientConfig) that).state.copy(parent);
        } else {
            state = new State(parent);
            state.loadFrom(that);
        }
    }

    /**
     * Construct a new Jersey configuration instance using the supplied state.
     *
     * @param state to be referenced from the new configuration instance.
     */
    private ClientConfig(final State state) {
        this.state = state;
    }

    /**
     * Take a snapshot of the current configuration and its internal state.
     * 

* The returned configuration object is an new instance different from the * original one, however the cloning of the internal configuration state is * lazily deferred until either original or the snapshot configuration is * modified for the first time since the snapshot was taken. * * @return snapshot of the current configuration. */ ClientConfig snapshot() { state.markAsShared(); return new ClientConfig(state); } /** * Load the internal configuration state from an externally provided configuration state. * * Calling this method effectively replaces existing configuration state of the instance * with the state represented by the externally provided configuration. * * @param config external configuration state to replace the configuration of this configurable * instance. * @return the updated client configuration instance. */ public ClientConfig loadFrom(final Configuration config) { if (config instanceof ClientConfig) { state = ((ClientConfig) config).state.copy(); } else { state.loadFrom(config); } return this; } @Override public ClientConfig register(final Class providerClass) { state = state.register(providerClass); return this; } @Override public ClientConfig register(final Object provider) { state = state.register(provider); return this; } @Override public ClientConfig register(final Class providerClass, final int bindingPriority) { state = state.register(providerClass, bindingPriority); return this; } @Override public ClientConfig register(final Class providerClass, final Class... contracts) { state = state.register(providerClass, contracts); return this; } @Override public ClientConfig register(final Class providerClass, final Map, Integer> contracts) { state = state.register(providerClass, contracts); return this; } @Override public ClientConfig register(final Object provider, final int bindingPriority) { state = state.register(provider, bindingPriority); return this; } @Override public ClientConfig register(final Object provider, final Class... contracts) { state = state.register(provider, contracts); return this; } @Override public ClientConfig register(final Object provider, final Map, Integer> contracts) { state = state.register(provider, contracts); return this; } @Override public ClientConfig property(final String name, final Object value) { state = state.property(name, value); return this; } @Override public ClientConfig getConfiguration() { return this; } @Override public RuntimeType getRuntimeType() { return state.getRuntimeType(); } @Override public Map getProperties() { return state.getProperties(); } @Override public Object getProperty(final String name) { return state.getProperty(name); } @Override public Collection getPropertyNames() { return state.getPropertyNames(); } @Override public boolean isProperty(final String name) { return state.isProperty(name); } @Override public boolean isEnabled(final Feature feature) { return state.isEnabled(feature); } @Override public boolean isEnabled(final Class featureClass) { return state.isEnabled(featureClass); } @Override public boolean isRegistered(final Object component) { return state.isRegistered(component); } @Override public Map, Integer> getContracts(final Class componentClass) { return state.getContracts(componentClass); } @Override public boolean isRegistered(final Class componentClass) { return state.isRegistered(componentClass); } @Override public Set> getClasses() { return state.getClasses(); } @Override public Set getInstances() { return state.getInstances(); } /** * Register a custom Jersey client connector provider. *

* The registered {@code ConnectorProvider} instance will provide a * Jersey client {@link org.glassfish.jersey.client.spi.Connector} * for the {@link org.glassfish.jersey.client.JerseyClient} instance * created with this client configuration. *

* * @param connectorProvider custom connector provider. Must not be {@code null}. * @return this client config instance. * @throws java.lang.NullPointerException in case the {@code connectorProvider} is {@code null}. * @since 2.5 */ public ClientConfig connectorProvider(final ConnectorProvider connectorProvider) { state = state.connectorProvider(connectorProvider); return this; } /** * Get the client transport connector. * * May return {@code null} if no connector has been set. * * @return client transport connector or {code null} if not set. */ public Connector getConnector() { return state.getConnector(); } /** * Get the client transport connector provider. * * If no custom connector provider has been set, * {@link org.glassfish.jersey.client.HttpUrlConnectorProvider default connector provider} * instance is returned. * * @return configured client transport connector provider. * @since 2.5 */ public ConnectorProvider getConnectorProvider() { return state.getConnectorProvider(); } /** * Get the configured runtime. * * @return configured runtime. */ ClientRuntime getRuntime() { return state.runtime.get(); } /** * Get the parent Jersey client this configuration is bound to. * * May return {@code null} if no parent client has been bound. * * @return bound parent Jersey client or {@code null} if not bound. */ public JerseyClient getClient() { return state.getClient(); } /** * Pre initializes this configuration by initializing {@link ClientRuntime client runtime} * including {@link org.glassfish.jersey.message.MessageBodyWorkers message body workers}. * Once this method is called no other method implementing {@link Configurable} should be called * on this pre initialized configuration otherwise configuration will change back to uninitialized. *

* Note that this method must be called only when configuration is attached to the client. * * @return Client configuration. */ ClientConfig preInitialize() { state = state.preInitialize(); return this; } /** * Check that the configuration instance has a parent client set. * * @throws IllegalStateException in case no parent Jersey client has been * bound to the configuration instance yet. */ void checkClient() throws IllegalStateException { if (getClient() == null) { throw new IllegalStateException("Client configuration does not contain a parent client instance."); } } @Override public boolean equals(final Object obj) { if (obj == null) { return false; } if (getClass() != obj.getClass()) { return false; } final ClientConfig other = (ClientConfig) obj; return this.state == other.state || (this.state != null && this.state.equals(other.state)); } @Override public int hashCode() { int hash = 7; hash = 47 * hash + (this.state != null ? this.state.hashCode() : 0); return hash; } }