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// Portions Copyright [2018-2021] [Payara Foundation and/or its affiliates]
package com.sun.enterprise.iiop.security;

import fish.payara.nucleus.cluster.PayaraCluster;
import java.lang.ref.WeakReference;

import org.glassfish.enterprise.iiop.api.GlassFishORBFactory;
import org.glassfish.enterprise.iiop.api.GlassFishORBHelper;
import org.glassfish.enterprise.iiop.impl.GlassFishORBManager;
import org.glassfish.hk2.api.ServiceLocator;
import org.glassfish.internal.api.Globals;

import com.sun.enterprise.config.serverbeans.Servers;

import jakarta.inject.Inject;
import jakarta.inject.Provider;

/**
 * This class is a local utility class to provide for hk2 lookups during runtime.
 * 
 * @author Sudarsan Sridhar
 */
public class Lookups {

    @Inject
    private Provider securityMechanismSelectorProvider;

    @Inject
    private Provider glassFishORBHelperProvider;
    
    @Inject
    private Provider glassFishORBFactoryProvider;

    @Inject
    private Provider securityContextUtilProvider;

    @Inject
    private Provider payaraCluster;

    /**
     * Static singleton {@link Habitat} instance.
     */
    private static final ServiceLocator habitat = Globals.getDefaultHabitat();

    /**
     * Static singleton {@link Lookups} instance. Note that this is assigned lazily and may remain null
     * if the {@link Habitat} can not be obtained.
     */
    private static Lookups singleton;

    private static WeakReference sms = new WeakReference(null);
    private static WeakReference orb = new WeakReference(null);
    private static WeakReference sc = new WeakReference(null);

    private Lookups() {
    }

    /**
     * Check to see if the singleton {@link Lookups} reference has been assigned. If null, then attempt
     * to obtain and assign the singleton {@link Lookups} instance.
     *
     * @return true if the singleton instance has been successfully assigned; false otherwise
     */
    private static synchronized boolean checkSingleton() {
        if (singleton == null && habitat != null) {
            // Obtaining the singleton through the habitat will cause the injections to occur.
            singleton = habitat.create(Lookups.class);
            habitat.inject(singleton);
            habitat.postConstruct(singleton);
        }
        return singleton != null;
    }

    /**
     * Get the {@link SecurityMechanismSelector}.
     *
     * @return the {@link SecurityMechanismSelector}; null if not available
     */
    static SecurityMechanismSelector getSecurityMechanismSelector() {
        if (sms.get() != null) {
            return sms.get();
        }
        return _getSecurityMechanismSelector();
    }

    private static synchronized SecurityMechanismSelector _getSecurityMechanismSelector() {
        if (sms.get() == null && checkSingleton()) {
            sms = new WeakReference(singleton.securityMechanismSelectorProvider.get());
        }
        return sms.get();
    }

    /**
     * Get the {@link GlassFishORBHelper}.
     *
     * @return the {@link GlassFishORBHelper}; null if not available
     */
    static GlassFishORBHelper getGlassFishORBHelper() {
        if (orb.get() != null) {
            return orb.get();
        }
        return _getGlassFishORBHelper();
    }

    private static synchronized GlassFishORBHelper _getGlassFishORBHelper() {
        if (orb.get() == null && checkSingleton()) {
            orb = new WeakReference(singleton.glassFishORBHelperProvider.get());
        }
        return orb.get();
    }

    /**
     * Get the {@link SecurityContextUtil}.
     *
     * @return the {@link SecurityContextUtil}; null if not available
     */
    static SecurityContextUtil getSecurityContextUtil() {
        if (sc.get() != null) {
            return sc.get();
        }
        return _getSecurityContextUtil();
    }

    private static synchronized SecurityContextUtil _getSecurityContextUtil() {
        if (sc.get() == null && checkSingleton()) {
            sc = new WeakReference(singleton.securityContextUtilProvider.get());
        }
        return sc.get();
    }

    /**
     * Get the {@link GMSAdapterService}.
     *
     * @return the {@link GMSAdapterService}; null if not available
     */
    static PayaraCluster getCluster() {
        return checkSingleton() ? singleton.payaraCluster.get() : null;
    }
    
    static GlassFishORBFactory getGlassFishORBFactory() {
    	return checkSingleton() ? singleton.glassFishORBFactoryProvider.get() : null;
    }
}