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

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 *

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 * 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

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

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

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/*

 * @test

 * @summary Basic test for the standard BodySubscribers default behavior

 * @bug 8225583

 * @run testng BodySubscribersTest

 */

import java.net.http.HttpResponse.BodySubscriber;

import java.nio.ByteBuffer;

import java.nio.file.Path;

import java.util.List;

import java.util.concurrent.Flow;

import java.util.function.Supplier;

import org.testng.annotations.DataProvider;

import org.testng.annotations.Test;

import static java.lang.System.out;

import static java.net.http.HttpResponse.BodySubscribers.*;

import static java.nio.charset.StandardCharsets.UTF_8;

import static java.nio.file.StandardOpenOption.CREATE;

import static org.testng.Assert.assertTrue;

import static org.testng.Assert.assertNotNull;

import static org.testng.Assert.expectThrows;

import static org.testng.Assert.fail;

public class BodySubscribersTest {

    static final Class<NullPointerException> NPE = NullPointerException.class;

    // Supplier of BodySubscriber<?>, with a descriptive name

    static class BSSupplier implements Supplier<BodySubscriber<?>> {

        private final Supplier<BodySubscriber<?>> supplier;

        private final String name;

        private BSSupplier(Supplier<BodySubscriber<?>> supplier, String name) {

            this.supplier = supplier;

            this.name = name;

        }

        static BSSupplier create(String name, Supplier<BodySubscriber<?>> supplier) {

            return new BSSupplier(supplier, name);

        }

        @Override public BodySubscriber<?> get() { return supplier.get(); }

        @Override public String toString() { return name; }

    }

    static class LineSubscriber implements Flow.Subscriber<String> {

        @Override public void onSubscribe(Flow.Subscription subscription) {  }

        @Override public void onNext(String item) { fail(); }

        @Override public void onError(Throwable throwable) { fail(); }

        @Override public void onComplete() { fail(); }

    }

    static class BBSubscriber implements Flow.Subscriber<List<ByteBuffer>> {

        @Override public void onSubscribe(Flow.Subscription subscription) {  }

        @Override public void onNext(List<ByteBuffer> item) { fail(); }

        @Override public void onError(Throwable throwable) { fail(); }

        @Override public void onComplete() { fail(); }

    }

    @DataProvider(name = "bodySubscriberSuppliers")

    public Object[][] bodySubscriberSuppliers() { ;

        List<Supplier<BodySubscriber<?>>> list = List.of(

            BSSupplier.create("ofByteArray",   () -> ofByteArray()),

            BSSupplier.create("ofInputStream", () -> ofInputStream()),

            BSSupplier.create("ofBAConsumer",  () -> ofByteArrayConsumer(ba -> { })),

            BSSupplier.create("ofLines",       () -> ofLines(UTF_8)),

            BSSupplier.create("ofPublisher",   () -> ofPublisher()),

            BSSupplier.create("ofFile",        () -> ofFile(Path.of("f"))),

            BSSupplier.create("ofFile-opts)",  () -> ofFile(Path.of("f"), CREATE)),

            BSSupplier.create("ofString",      () -> ofString(UTF_8)),

            BSSupplier.create("buffering",     () -> buffering(ofByteArray(), 10)),

            BSSupplier.create("discarding",    () -> discarding()),

            BSSupplier.create("mapping",       () -> mapping(ofString(UTF_8), s -> s)),

            BSSupplier.create("replacing",     () -> replacing("hello")),

            BSSupplier.create("fromSubscriber-1",     () -> fromSubscriber(new BBSubscriber())),

            BSSupplier.create("fromSubscriber-2",     () -> fromSubscriber(new BBSubscriber(), s -> s)),

            BSSupplier.create("fromLineSubscriber-1", () -> fromLineSubscriber(new LineSubscriber())),

            BSSupplier.create("fromLineSubscriber-2", () -> fromLineSubscriber(new LineSubscriber(), s -> s, UTF_8, ","))

        );

        return list.stream().map(x -> new Object[] { x }).toArray(Object[][]::new);

    }

    @Test(dataProvider = "bodySubscriberSuppliers")

    void nulls(Supplier<BodySubscriber<?>> bodySubscriberSupplier) {

        BodySubscriber<?> bodySubscriber = bodySubscriberSupplier.get();

        boolean subscribed = false;

        do {

            assertNotNull(bodySubscriber.getBody());

            assertNotNull(bodySubscriber.getBody());

            assertNotNull(bodySubscriber.getBody());

            expectThrows(NPE, () -> bodySubscriber.onSubscribe(null));

            expectThrows(NPE, () -> bodySubscriber.onSubscribe(null));

            expectThrows(NPE, () -> bodySubscriber.onSubscribe(null));

            expectThrows(NPE, () -> bodySubscriber.onNext(null));

            expectThrows(NPE, () -> bodySubscriber.onNext(null));

            expectThrows(NPE, () -> bodySubscriber.onNext(null));

            expectThrows(NPE, () -> bodySubscriber.onNext(null));

            expectThrows(NPE, () -> bodySubscriber.onError(null));

            expectThrows(NPE, () -> bodySubscriber.onError(null));

            expectThrows(NPE, () -> bodySubscriber.onError(null));

            if (!subscribed) {

                out.println("subscribing");

                // subscribe the Subscriber and repeat

                bodySubscriber.onSubscribe(new Flow.Subscription() {

                    @Override public void request(long n) { /* do nothing */ }

                    @Override public void cancel() { fail(); }

                });

                subscribed = true;

                continue;

            }

            break;

        } while (true);

    }

    @Test(dataProvider = "bodySubscriberSuppliers")

    void subscribeMoreThanOnce(Supplier<BodySubscriber<?>> bodySubscriberSupplier) {

        BodySubscriber<?> bodySubscriber = bodySubscriberSupplier.get();

        bodySubscriber.onSubscribe(new Flow.Subscription() {

            @Override public void request(long n) { /* do nothing */ }

            @Override public void cancel() { fail(); }

        });

        for (int i = 0; i < 5; i++) {

            var subscription = new Flow.Subscription() {

                volatile boolean cancelled;

                @Override public void request(long n) { fail(); }

                @Override public void cancel() { cancelled = true; }

            };

            bodySubscriber.onSubscribe(subscription);

            assertTrue(subscription.cancelled);

        }

    }

}