/*

 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

import java.io.IOException;

import java.io.InputStream;

import java.io.UncheckedIOException;

import java.nio.ByteBuffer;

import java.util.List;

import java.util.concurrent.CompletableFuture;

import java.util.concurrent.CompletionException;

import java.util.concurrent.CompletionStage;

import java.util.concurrent.CountDownLatch;

import java.util.concurrent.ExecutionException;

import java.util.concurrent.Flow;

import java.util.concurrent.atomic.AtomicBoolean;

import java.util.concurrent.atomic.AtomicLong;

import org.testng.annotations.Test;

/*

 * @test

 * @summary Simple smoke test for BodySubscriber.asInputStream();

 * @run testng/othervm HttpResponseInputStreamTest

 * @author daniel fuchs

 */

public class HttpResponseInputStreamTest {

    static class TestException extends IOException {}

    public static void main(String[] args) throws InterruptedException, ExecutionException {

        testOnError();

    }

    /**

     * Tests that a client will be unblocked and will throw an IOException

     * if an error occurs while the client is waiting for more data.

     * @throws InterruptedException

     * @throws ExecutionException

     */

    @Test

    public static void testOnError() throws InterruptedException, ExecutionException {

        CountDownLatch latch = new CountDownLatch(1);

        ErrorTestSubscription s = new ErrorTestSubscription(isb);

        CompletionStage<Throwable> cs =

                isb.getBody().thenApplyAsync((is) -> s.accept(latch, is));

        latch.await();

        isb.onSubscribe(s);

        s.t.join();

        Throwable result = cs.toCompletableFuture().get();

        Throwable t = result;

        if (!(t instanceof IOException)) {

            throw new RuntimeException("Failed to receive excpected IOException", result);

        } else {

            System.out.println("Got expected exception: " + t);

        }

        while (t != null) {

            if (t instanceof TestException) break;

            t = t.getCause();

        }

        if (t instanceof TestException) {

            System.out.println("Got expected cause: " + t);

        } else {

            throw new RuntimeException("Failed to receive excpected TestException", result);

        }

    }

    static class ErrorTestSubscription implements Flow.Subscription {

        final BodySubscriber<InputStream> isb;

        final Thread t = new Thread() {

            @Override

            public void run() {

                try {

                    // Give time to

                    System.out.println("waiting...");

                    Thread.sleep(1000);

                } catch (InterruptedException e) {

                }

                System.out.println("Calling onError...");

                isb.onError(new TestException());

            }

        };

        ErrorTestSubscription(BodySubscriber<InputStream> isb) {

            this.isb = isb;

        }

        int requested = 0;

        @Override

        public void request(long n) {

            System.out.println("Got request: " + n);

            if (requested == 0 && n > 0) {

                //isb.onNext(List.of(java.nio.ByteBuffer.wrap(new byte[] {0x01})));

                requested += n;

                t.start();

            }

        }

        @Override

        public void cancel() {

        }

        public Throwable accept(CountDownLatch latch, InputStream is) {

            System.out.println("got " + is);

            try {

                latch.countDown();

                System.out.println("reading all bytes");

                is.readAllBytes();

                System.out.println("all bytes read");

            } catch (IOException e) {

                return e;

            } finally {

                try {

                    is.close();

                } catch (IOException e) {

                    return e;

                }

            }

            return is == null ? new NullPointerException() : null;

        }

    }

    static InputStream close(InputStream is) {

        try {

            is.close();

        } catch (IOException io) {

            throw new CompletionException(io);

        }

        return is;

    }

    @Test

    public static void testCloseAndSubscribe()

            throws InterruptedException, ExecutionException

    {

        TestCancelOnCloseSubscription s = new TestCancelOnCloseSubscription();

        InputStream is = isb.getBody()

                .thenApply(HttpResponseInputStreamTest::close)

                .toCompletableFuture()

                .get();

        isb.onSubscribe(s);

        System.out.println(s);

        if (!s.cancelled.get()) {

            throw new RuntimeException("subscription not cancelled");

        }

        if (s.request.get() > 0) {

            throw new RuntimeException("subscription has demand");

        }

    }

    static byte[] readAllBytes(InputStream is) {

        try {

            return is.readAllBytes();

        } catch (IOException io) {

            io.printStackTrace();

            throw new CompletionException(io);

        }

    }

    @Test

    public static void testSubscribeAndClose()

            throws InterruptedException, ExecutionException

    {

        TestCancelOnCloseSubscription s = new TestCancelOnCloseSubscription();

        InputStream is = isb.getBody().toCompletableFuture().get();

        isb.onSubscribe(s);

        if (s.cancelled.get()) {

            throw new RuntimeException("subscription cancelled");

        }

        CompletableFuture<String> cf = CompletableFuture.supplyAsync(

                () -> HttpResponseInputStreamTest.readAllBytes(is))

                .thenApply(String::new);

        while (s.request.get() == 0) {

            Thread.sleep(100);

        }

        isb.onNext(List.of(ByteBuffer.wrap("coucou".getBytes())));

        close(is);

        System.out.println(s);

        if (!s.cancelled.get()) {

            throw new RuntimeException("subscription not cancelled");

        }

        if (s.request.get() == 0) {

            throw new RuntimeException("subscription has no demand");

        }

        try {

            System.out.println("read " + cf.get() + "!");

            throw new RuntimeException("expected IOException not raised");

        } catch (ExecutionException | CompletionException x) {

            if (x.getCause() instanceof IOException) {

                System.out.println("Got expected IOException: " + x.getCause());

            } else {

                throw x;

            }

        }

    }

    static class TestCancelOnCloseSubscription implements Flow.Subscription {

        final AtomicLong request = new AtomicLong();

        final AtomicBoolean cancelled = new AtomicBoolean();

        @Override

        public void request(long n) {

            request.addAndGet(n);

        }

        @Override

        public void cancel() {

            cancelled.set(true);

        }

        @Override

        public String toString() {

            return String.format("%s(request=%d, cancelled=%s)",

                    this.getClass().getSimpleName(),

                    request.get(),

                    cancelled.get());

        }

    }

}