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package fish.payara.security.authentication.twoIdentityStore;

import static org.glassfish.soteria.cdi.CdiUtils.getAnnotation;

import fish.payara.security.identitystores.YubikeyIdentityStore;
import fish.payara.security.annotations.YubikeyIdentityStoreDefinition;

import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import java.util.logging.Level;
import java.util.logging.Logger;
import jakarta.enterprise.context.ApplicationScoped;
import jakarta.enterprise.event.Observes;
import jakarta.enterprise.inject.spi.AfterBeanDiscovery;
import jakarta.enterprise.inject.spi.Bean;
import jakarta.enterprise.inject.spi.BeanManager;
import jakarta.enterprise.inject.spi.BeforeBeanDiscovery;
import jakarta.enterprise.inject.spi.CDI;
import jakarta.enterprise.inject.spi.Extension;
import jakarta.enterprise.inject.spi.ProcessBean;
import jakarta.security.enterprise.authentication.mechanism.http.HttpAuthenticationMechanism;
import jakarta.security.enterprise.identitystore.IdentityStore;
import org.glassfish.soteria.cdi.LoginToContinueAnnotationLiteral;
import fish.payara.security.annotations.TwoIdentityStoreAuthenticationMechanismDefinition;
import fish.payara.security.identitystores.YubikeyIdentityStoreDefinitionAnnotationLiteral;
import org.glassfish.common.util.PayaraCdiProducer;

/**
 * CDI Extension class. Uses Dynamic producers to add {@link TwoIdentityStoreAuthenticationMechanism},
 * {@link YubikeyIdentityStore} if annotations containing their corresponding *Definition are found.
 *
 * @author Mark Wareham
 */
public class CDIExtension implements Extension {

    private static final Logger LOG = Logger.getLogger(CDIExtension.class.getName());
    private List> identityStoreBeans = new ArrayList<>();
    private Bean authenticationMechanismBean;
    private static final String MODULE_PREFIX = "2FA Module Extension ";

    public void register(@Observes BeforeBeanDiscovery beforeBean, BeanManager beanManager) {
        beforeBean.addAnnotatedType(beanManager.createAnnotatedType(TwoIdentityStoreAuthenticationMechanism.class),
                MODULE_PREFIX + TwoIdentityStoreAuthenticationMechanism.class.getName());
        beforeBean.addAnnotatedType(beanManager.createAnnotatedType(TwoIdentityStoreAuthenticationMechanismState.class),
                MODULE_PREFIX + TwoIdentityStoreAuthenticationMechanismState.class.getName());
        beforeBean.addAnnotatedType(beanManager.createAnnotatedType(YubikeyIdentityStore.class), 
                MODULE_PREFIX + YubikeyIdentityStore.class.getName());
        
    }

    public  void processBean(@Observes ProcessBean eventIn, BeanManager beanManager) {

        ProcessBean event = eventIn; // JDK8 u60 workaround

        //create the bean being proccessed.
        Class beanClass = event.getBean().getBeanClass();

        //get the identity store from the annotation (if it exists)
        Optional optionalYubikeyIdentityStore = getAnnotation(beanManager,
                event.getAnnotated(), YubikeyIdentityStoreDefinition.class);

        optionalYubikeyIdentityStore.ifPresent(yubikeyIdentityStoreDefinition -> {
            logActivatedIdentityStore(YubikeyIdentityStoreDefinition.class, beanClass);
            identityStoreBeans.add(new PayaraCdiProducer()
                    .scope(ApplicationScoped.class)
                    .beanClass(IdentityStore.class)
                    .types(Object.class, IdentityStore.class)
                    .addToId(YubikeyIdentityStoreDefinition.class)
                    .create(e -> CDI.current().select(YubikeyIdentityStore.class)
                            .get()
                            .init(YubikeyIdentityStoreDefinitionAnnotationLiteral.eval(yubikeyIdentityStoreDefinition))
                    )
            );
        });

        Optional optionalOneTimePasswordMechanism
                = getAnnotation(beanManager, event.getAnnotated(), TwoIdentityStoreAuthenticationMechanismDefinition.class);
        optionalOneTimePasswordMechanism.ifPresent(oneTimePasswordAuthenticationMechanismDefinition -> {

            logActivatedAuthenticationMechanism(TwoIdentityStoreAuthenticationMechanismDefinition.class, beanClass);

            authenticationMechanismBean = new PayaraCdiProducer()
                    .scope(ApplicationScoped.class)
                    .beanClass(HttpAuthenticationMechanism.class)
                    .types(Object.class, HttpAuthenticationMechanism.class)
                    .addToId(TwoIdentityStoreAuthenticationMechanismDefinition.class)
                    .create(e -> {
                        return CDI.current()
                                .select(TwoIdentityStoreAuthenticationMechanism.class)
                                .get()
                                .loginToContinue(LoginToContinueAnnotationLiteral.eval(
                                        oneTimePasswordAuthenticationMechanismDefinition.loginToContinue()));
                    });
        });
    }

    public void afterBean(final @Observes AfterBeanDiscovery afterBeanDiscovery, BeanManager beanManager) {

        if (!identityStoreBeans.isEmpty()) {
            for (Bean identityStoreBean : identityStoreBeans) {
                afterBeanDiscovery.addBean(identityStoreBean);
            }
        }

        if (authenticationMechanismBean != null) {
            afterBeanDiscovery.addBean(authenticationMechanismBean);
        }

    }

    private void logActivatedIdentityStore(Class identityStoreClass, Class beanClass) {
        LOG.log(Level.INFO, "Activating {0} identity store from {1} class",
                new String[]{identityStoreClass.getName(), beanClass.getName()});
    }

    private void logActivatedAuthenticationMechanism(Class authenticationMechanismClass, Class beanClass) {
        LOG.log(Level.INFO, "Activating {0} authentication mechanism from {1} class",
                new String[]{authenticationMechanismClass.getName(), beanClass.getName()});
    }

}