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package org.glassfish.jersey.tests.e2e.server;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.Callable;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Application;

import javax.inject.Inject;
import javax.inject.Qualifier;
import javax.inject.Singleton;

import org.glassfish.jersey.internal.JerseyErrorService;
import org.glassfish.jersey.internal.inject.Injections;
import org.glassfish.jersey.process.internal.RequestScope;
import org.glassfish.jersey.process.internal.RequestScoped;
import org.glassfish.jersey.test.DeploymentContext;
import org.glassfish.jersey.test.JerseyTest;

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

import org.junit.Test;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotSame;

/**
 * @author Pavel Bucek (pavel.bucek at oracle.com)
 */
public class CustomInjectablesApplicationTest extends JerseyTest {

    public static class MyApplication extends Application {

        public static Set<Class<?>> classes = new HashSet<Class<?>>() {{
            add(Resource.class);
        }};

        @Inject
        public MyApplication(ServiceLocator serviceLocator) {
            System.out.println("Registering injectables...");

            DynamicConfiguration dc = Injections.getConfiguration(serviceLocator);

            // request scope binding
            Injections.addBinding(
                    Injections.newBinder(MyInjectablePerRequest.class).to(MyInjectablePerRequest.class).in(RequestScoped.class),
                    dc);

            // singleton binding
            Injections.addBinding(
                    Injections.newBinder(MyInjectableSingleton.class).to(MyInjectableSingleton.class).in(Singleton.class),
                    dc);

            // singleton instance binding
            Injections.addBinding(
                    Injections.newBinder(new MyInjectableSingleton()).to(MyInjectableSingleton.class),
                    dc);

            // request scope binding with specified custom annotation
            Injections.addBinding(
                    Injections.newBinder(MyInjectablePerRequest.class).to(MyInjectablePerRequest.class)
                            .qualifiedBy(new MyQualifierImpl())
                            .in(RequestScoped.class),
                    dc);

            // commits changes
            dc.commit();
        }

        @Override
        public Set<Class<?>> getClasses() {
            return classes;
        }
    }

    public static class MyInjectablePerRequest {
        public int i = 0;
    }

    @Singleton
    public static class MyInjectableSingleton {
        public int i = 0;
    }

    @Retention(java.lang.annotation.RetentionPolicy.RUNTIME)
    @Target(ElementType.FIELD)
    @Qualifier
    public static @interface MyQualifier {

    }

    private static class MyQualifierImpl extends AnnotationLiteral<MyQualifier> implements MyQualifier {
    }

    @Path("/")
    public static class Resource {
        @Inject
        MyInjectablePerRequest myInjectablePerRequest;

        @Inject
        MyInjectableSingleton myInjectableSingleton;

        @Inject
        @MyQualifier
        MyInjectablePerRequest myInjectablePerRequest2;

        @GET
        @Path("/perrequest")
        public String getAndIncPerRequest() {
            return Integer.valueOf(++myInjectablePerRequest.i).toString();
        }

        @GET
        @Path("/perrequestCustomQualifier")
        public String getAndIncPerRequest2() {
            return Integer.valueOf(++myInjectablePerRequest2.i).toString();
        }

        @GET
        @Path("/singleton")
        @Produces("text/plain")
        public String getAndIncSingleton() {
            System.out.println(myInjectableSingleton);
            return Integer.valueOf(++myInjectableSingleton.i).toString();
        }
    }

    @Override
    protected DeploymentContext configureDeployment() {
        return DeploymentContext.newInstance(MyApplication.class);
    }

    @Test
    public void testPerRequest() throws Exception {
        final javax.ws.rs.client.WebTarget perrequest = target().path("perrequest");

        assertEquals("1", perrequest.request().get(String.class));
        assertEquals("1", perrequest.request().get(String.class));
        assertEquals("1", perrequest.request().get(String.class));
    }

    @Test
    public void testSingleton() throws Exception {
        final javax.ws.rs.client.WebTarget perrequest = target().path("singleton");

        assertEquals("1", perrequest.request().get(String.class));
        assertEquals("2", perrequest.request().get(String.class));
        assertEquals("3", perrequest.request().get(String.class));
    }

    @Test
    public void testCustomQualifier() throws Exception {
        final javax.ws.rs.client.WebTarget perrequestCustomAnnotation = target().path("perrequestCustomQualifier");

        assertEquals("1", perrequestCustomAnnotation.request().get(String.class));
        assertEquals("1", perrequestCustomAnnotation.request().get(String.class));
        assertEquals("1", perrequestCustomAnnotation.request().get(String.class));
    }

    @Test
    public void plainHK2Test() throws Exception {
        final ServiceLocator locator = Injections.createLocator(new RequestScope.Binder(), new JerseyErrorService.Binder(),

                new AbstractBinder() {
                    @Override
                    protected void configure() {
                        bindAsContract(MyInjectablePerRequest.class).in(RequestScoped.class);
                        bindAsContract(MyInjectableSingleton.class).in(Singleton.class);
                    }
                });

        final RequestScope requestScope = locator.getService(RequestScope.class);

        final MyInjectableSingleton myInjectableSingleton = locator.getService(MyInjectableSingleton.class);
        assertEquals(myInjectableSingleton, locator.getService(MyInjectableSingleton.class));

        final MyInjectablePerRequest myInjectablePerRequest = requestScope.runInScope(new Callable<MyInjectablePerRequest>() {

            @Override
            public MyInjectablePerRequest call() throws Exception {
                final MyInjectablePerRequest myInjectablePerRequest = locator.getService(MyInjectablePerRequest.class);
                assertEquals(myInjectablePerRequest, locator.getService(MyInjectablePerRequest.class));
                return myInjectablePerRequest;
            }
        });

        requestScope.runInScope(new Runnable() {

            @Override
            public void run() {
                assertNotSame(myInjectablePerRequest, locator.getService(MyInjectablePerRequest.class));
            }
        });

    }

    @Test
    public void plainHK2DynamicTest() throws Exception {
        final ServiceLocator locator = Injections.createLocator(new RequestScope.Binder());
        DynamicConfiguration dc = Injections.getConfiguration(locator);

        Injections.addBinding(
                Injections.newBinder(MyInjectablePerRequest.class).to(MyInjectablePerRequest.class).in(RequestScoped.class),
                dc);
        Injections.addBinding(
                Injections.newBinder(MyInjectableSingleton.class).to(MyInjectableSingleton.class).in(Singleton.class),
                dc);
        dc.commit();

        final RequestScope requestScope = locator.getService(RequestScope.class);

        final MyInjectableSingleton myInjectableSingleton = locator.getService(MyInjectableSingleton.class);
        assertEquals(myInjectableSingleton, locator.getService(MyInjectableSingleton.class));

        final MyInjectablePerRequest myInjectablePerRequest = requestScope.runInScope(new Callable<MyInjectablePerRequest>() {
            @Override
            public MyInjectablePerRequest call() throws Exception {
                final MyInjectablePerRequest myInjectablePerRequest = locator.getService(MyInjectablePerRequest.class);
                assertEquals(myInjectablePerRequest, locator.getService(MyInjectablePerRequest.class));
                return myInjectablePerRequest;
            }
        });

        requestScope.runInScope(new Runnable() {
            @Override
            public void run() {
                assertNotSame(myInjectablePerRequest, locator.getService(MyInjectablePerRequest.class));
            }
        });
    }
}
