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package org.glassfish.jersey.client.rx.rxjava;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.atomic.AtomicReference;

import javax.ws.rs.NotFoundException;
import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientBuilder;
import javax.ws.rs.core.GenericType;
import javax.ws.rs.core.Response;

import org.glassfish.jersey.client.rx.RxClient;
import org.glassfish.jersey.client.rx.RxWebTarget;
import org.glassfish.jersey.process.JerseyProcessingUncaughtExceptionHandler;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.containsString;
import static org.hamcrest.core.Is.is;

import jersey.repackaged.com.google.common.util.concurrent.ThreadFactoryBuilder;
import rx.Subscriber;

/**
 * @author Michal Gajdos (michal.gajdos at oracle.com)
 */
public class RxObservableTest {

    private Client client;
    private ExecutorService executor;

    @Before
    public void setUp() throws Exception {
        client = ClientBuilder.newClient().register(TerminalClientRequestFilter.class);
        executor = new ScheduledThreadPoolExecutor(1, new ThreadFactoryBuilder()
                .setNameFormat("jersey-rx-client-test-%d")
                .setUncaughtExceptionHandler(new JerseyProcessingUncaughtExceptionHandler())
                .build());
    }

    @After
    public void tearDown() throws Exception {
        executor.shutdown();

        client.close();
        client = null;
    }

    @Test
    public void testNewClient() throws Exception {
        testClient(RxObservable.newClient().register(TerminalClientRequestFilter.class), false);
    }

    @Test
    public void testNewClientExecutor() throws Exception {
        testClient(RxObservable.newClient(executor).register(TerminalClientRequestFilter.class), true);
    }

    @Test
    public void testFromClient() throws Exception {
        testClient(RxObservable.from(client), false);
    }

    @Test
    public void testFromClientExecutor() throws Exception {
        testClient(RxObservable.from(client, executor), true);
    }

    @Test
    public void testFromTarget() throws Exception {
        testTarget(RxObservable.from(client.target("http://jersey.java.net")), false);
    }

    @Test
    public void testFromTargetExecutor() throws Exception {
        testTarget(RxObservable.from(client.target("http://jersey.java.net"), executor), true);
    }

    @Test
    public void testNotFoundResponse() throws Exception {
        final RxObservableInvoker invoker = RxObservable.from(client.target("http://jersey.java.net"))
                .request()
                .header("Response-Status", 404)
                .rx();

        testInvoker(invoker, 404, false);
    }

    @Test(expected = NotFoundException.class)
    public void testNotFoundReadEntityViaClass() throws Throwable {
        try {
            RxObservable.from(client.target("http://jersey.java.net"))
                    .request()
                    .header("Response-Status", 404)
                    .rx()
                    .get(String.class)
                    .toBlocking()
                    .toFuture()
                    .get();
        } catch (final Exception expected) {
            // java.util.concurrent.ExecutionException
            throw expected
                    // javax.ws.rs.ProcessingException
                    .getCause()
                    // javax.ws.rs.NotFoundException
                    .getCause();
        }
    }

    @Test(expected = NotFoundException.class)
    public void testNotFoundReadEntityViaGenericType() throws Throwable {
        try {
            RxObservable.from(client.target("http://jersey.java.net"))
                    .request()
                    .header("Response-Status", 404)
                    .rx()
                    .get(new GenericType<String>() {})
                    .toBlocking()
                    .toFuture()
                    .get();
        } catch (final Exception expected) {
            // java.util.concurrent.ExecutionException
            throw expected
                    // javax.ws.rs.ProcessingException
                    .getCause()
                    // javax.ws.rs.NotFoundException
                    .getCause();
        }
    }

    @Test
    public void testReadEntityViaClass() throws Throwable {
        final String response = RxObservable.from(client.target("http://jersey.java.net"))
                .request()
                .rx()
                .get(String.class)
                .toBlocking()
                .toFuture()
                .get();

        assertThat(response, is("NO-ENTITY"));
    }

    @Test
    public void testReadEntityViaGenericType() throws Throwable {
        final String response = RxObservable.from(client.target("http://jersey.java.net"))
                .request()
                .rx()
                .get(new GenericType<String>() {})
                .toBlocking()
                .toFuture()
                .get();

        assertThat(response, is("NO-ENTITY"));
    }

    private void testClient(final RxClient<RxObservableInvoker> rxClient, final boolean testDedicatedThread) throws Exception {
        testTarget(rxClient.target("http://jersey.java.net"), testDedicatedThread);
    }

    private void testTarget(final RxWebTarget<RxObservableInvoker> rxTarget, final boolean testDedicatedThread)
            throws Exception {
        testInvoker(rxTarget.request().rx(), 200, testDedicatedThread);
    }

    private void testInvoker(final RxObservableInvoker rx, final int expectedStatus, final boolean testDedicatedThread)
            throws Exception {
        final CountDownLatch latch = new CountDownLatch(1);
        final AtomicReference<Response> responseRef = new AtomicReference<>();
        final AtomicReference<Throwable> errorRef = new AtomicReference<>();

        rx.get().subscribe(new Subscriber<Response>() {
            @Override
            public void onCompleted() {
                latch.countDown();
            }

            @Override
            public void onError(final Throwable e) {
                errorRef.set(e);
                latch.countDown();
            }

            @Override
            public void onNext(final Response response) {
                responseRef.set(response);
            }
        });

        latch.await();

        if (errorRef.get() == null) {
            testResponse(responseRef.get(), expectedStatus, testDedicatedThread);
        } else {
            throw (Exception) errorRef.get();
        }
    }

    private static void testResponse(final Response response, final int expectedStatus, final boolean testDedicatedThread) {
        assertThat(response.getStatus(), is(expectedStatus));
        assertThat(response.readEntity(String.class), is("NO-ENTITY"));

        // Executor.
        assertThat(response.getHeaderString("Test-Thread"), testDedicatedThread
                ? containsString("jersey-rx-client-test") : containsString("jersey-client-async-executor"));

        // Properties.
        assertThat(response.getHeaderString("Test-Uri"), is("http://jersey.java.net"));
        assertThat(response.getHeaderString("Test-Method"), is("GET"));
    }
}
