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package com.sun.jersey.server.impl.cdi;

import com.sun.jersey.api.core.ResourceConfig;
import com.sun.jersey.core.spi.component.ComponentContext;
import com.sun.jersey.core.spi.component.ComponentScope;
import com.sun.jersey.core.spi.component.ioc.IoCComponentProvider;
import com.sun.jersey.core.spi.component.ioc.IoCComponentProviderFactory;
import com.sun.jersey.core.spi.component.ioc.IoCDestroyable;
import com.sun.jersey.core.spi.component.ioc.IoCFullyManagedComponentProvider;
import com.sun.jersey.core.spi.component.ioc.IoCInstantiatedComponentProvider;
import com.sun.jersey.spi.container.WebApplication;
import com.sun.jersey.spi.container.WebApplicationListener;
import com.sun.jersey.spi.container.servlet.ServletContainer;
import java.lang.annotation.Annotation;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.logging.Logger;
import javax.annotation.ManagedBean;
import javax.enterprise.context.ApplicationScoped;
import javax.enterprise.context.Dependent;
import javax.enterprise.context.RequestScoped;
import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.inject.spi.Bean;
import javax.enterprise.inject.spi.BeanManager;

import static com.sun.jersey.server.impl.cdi.Utils.getBean;

/**
 * Factory for IoCComponentProvider for CDI beans.
 *
 * Crucially, it passes the WebApplication and ResourceConfig on to the CDIExtension,
 * allowing beans registered by the extension to (finally) do some work.
 *
 * @author [email protected]
 * @author robc
 */
public class CDIComponentProviderFactory implements
        IoCComponentProviderFactory, WebApplicationListener {

    private static final Logger LOGGER = Logger.getLogger(
            CDIComponentProviderFactory.class.getName());

    private final BeanManager beanManager;
    private final CDIExtension extension;

    public CDIComponentProviderFactory(Object bm, ResourceConfig rc, WebApplication wa) {
        beanManager = (BeanManager)bm;
        // work around proxying bug in Weld
        if (CDIExtension.lookupExtensionInBeanManager) {
            extension = CDIExtension.getInitializedExtensionFromBeanManager(beanManager);
        } else {
            extension = CDIExtension.getInitializedExtension();
        }
        extension.setWebApplication(wa);
        extension.setResourceConfig(rc);
    }

    public void onWebApplicationReady() {
        extension.lateInitialize();
    }

    public IoCComponentProvider getComponentProvider(Class c) {
        return getComponentProvider(null, c);
    }

    public IoCComponentProvider getComponentProvider(ComponentContext cc, final Class c) {
        final Bean b = getBean(beanManager, c);
        if (b == null) {
            return null;
        }

        final Class s = b.getScope();
        final ComponentScope cs = getComponentScope(b);

        if (s == Dependent.class) {
            if (!extension.getResourceConfig().getFeature(ServletContainer.FEATURE_ALLOW_RAW_MANAGED_BEANS)
                    && !c.isAnnotationPresent(ManagedBean.class)) {
                return null;
            }

            LOGGER.fine("Binding the CDI managed bean " + c.getName() +
                    " in scope " + s.getName() +
                    " to CDIComponentProviderFactory");

            return new ComponentProviderDestroyable() {

                // IoCInstantiatedComponentProvider

                public Object getInjectableInstance(Object o) {
                    return o;
                }

                public Object getInstance() {
                    final CreationalContext bcc = beanManager.createCreationalContext(b);
                    return c.cast(beanManager.getReference(b, c, bcc));
                }

                // IoCDestroyable

                public void destroy(Object o) {
                    final CreationalContext cc = beanManager.createCreationalContext(b);
                    ((Bean)b).destroy(o, cc);
                }
            };
        }
        else {
            LOGGER.fine("Binding the CDI managed bean " + c.getName() +
                    " in scope " + s.getName() +
                    " to CDIComponentProviderFactory in scope " + cs);

            return new IoCFullyManagedComponentProvider() {
                public ComponentScope getScope() {
                    return cs;
                }

                public Object getInstance() {
                    final CreationalContext bcc = beanManager.createCreationalContext(b);
                    return c.cast(beanManager.getReference(b, c, bcc));
                }
            };
        }
    }

    private interface ComponentProviderDestroyable extends IoCInstantiatedComponentProvider, IoCDestroyable {
    };

    private ComponentScope getComponentScope(Bean b) {
        ComponentScope cs = scopeMap.get(b.getScope());
        return (cs != null) ? cs : ComponentScope.Undefined;
    }

    private final Map, ComponentScope> scopeMap = createScopeMap();

    private Map, ComponentScope> createScopeMap() {
        Map, ComponentScope> m =
                new HashMap, ComponentScope>();
        m.put(ApplicationScoped.class, ComponentScope.Singleton);
        m.put(RequestScoped.class, ComponentScope.PerRequest);
        m.put(Dependent.class, ComponentScope.PerRequest);
        return Collections.unmodifiableMap(m);
    }
}