/**
 * Copyright (c) 2016-present, RxJava Contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is
 * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
 * the License for the specific language governing permissions and limitations under the License.
 */

package io.reactivex.internal.operators.flowable;

import static org.junit.Assert.*;
import static org.mockito.ArgumentMatchers.*;
import static org.mockito.Mockito.*;

import java.io.IOException;
import java.util.List;
import java.util.concurrent.*;

import org.junit.*;
import org.mockito.InOrder;
import org.reactivestreams.*;

import io.reactivex.*;
import io.reactivex.exceptions.TestException;
import io.reactivex.internal.subscriptions.BooleanSubscription;
import io.reactivex.plugins.RxJavaPlugins;
import io.reactivex.processors.PublishProcessor;
import io.reactivex.schedulers.TestScheduler;
import io.reactivex.subscribers.TestSubscriber;

public class FlowableTimeoutTests {
    private PublishProcessor<String> underlyingSubject;
    private TestScheduler testScheduler;
    private Flowable<String> withTimeout;
    private static final long TIMEOUT = 3;
    private static final TimeUnit TIME_UNIT = TimeUnit.SECONDS;

    @Before
    public void setUp() {

        underlyingSubject = PublishProcessor.create();
        testScheduler = new TestScheduler();
        withTimeout = underlyingSubject.timeout(TIMEOUT, TIME_UNIT, testScheduler);
    }

    @Test
    public void shouldNotTimeoutIfOnNextWithinTimeout() {
        Subscriber<String> observer = TestHelper.mockSubscriber();
        TestSubscriber<String> ts = new TestSubscriber<String>(observer);

        withTimeout.subscribe(ts);

        testScheduler.advanceTimeBy(2, TimeUnit.SECONDS);
        underlyingSubject.onNext("One");
        verify(observer).onNext("One");
        testScheduler.advanceTimeBy(2, TimeUnit.SECONDS);
        verify(observer, never()).onError(any(Throwable.class));
        ts.cancel();
    }

    @Test
    public void shouldNotTimeoutIfSecondOnNextWithinTimeout() {
        Subscriber<String> observer = TestHelper.mockSubscriber();
        TestSubscriber<String> ts = new TestSubscriber<String>(observer);

        withTimeout.subscribe(ts);

        testScheduler.advanceTimeBy(2, TimeUnit.SECONDS);
        underlyingSubject.onNext("One");
        testScheduler.advanceTimeBy(2, TimeUnit.SECONDS);
        underlyingSubject.onNext("Two");
        verify(observer).onNext("Two");
        testScheduler.advanceTimeBy(2, TimeUnit.SECONDS);
        verify(observer, never()).onError(any(Throwable.class));
        ts.dispose();
    }

    @Test
    public void shouldTimeoutIfOnNextNotWithinTimeout() {
        Subscriber<String> observer = TestHelper.mockSubscriber();
        TestSubscriber<String> ts = new TestSubscriber<String>(observer);

        withTimeout.subscribe(ts);

        testScheduler.advanceTimeBy(TIMEOUT + 1, TimeUnit.SECONDS);
        verify(observer).onError(any(TimeoutException.class));
        ts.dispose();
    }

    @Test
    public void shouldTimeoutIfSecondOnNextNotWithinTimeout() {
        Subscriber<String> observer = TestHelper.mockSubscriber();
        TestSubscriber<String> ts = new TestSubscriber<String>(observer);
        withTimeout.subscribe(observer);
        testScheduler.advanceTimeBy(2, TimeUnit.SECONDS);
        underlyingSubject.onNext("One");
        verify(observer).onNext("One");
        testScheduler.advanceTimeBy(TIMEOUT + 1, TimeUnit.SECONDS);
        verify(observer).onError(any(TimeoutException.class));
        ts.dispose();
    }

    @Test
    public void shouldCompleteIfUnderlyingComletes() {
        Subscriber<String> observer = TestHelper.mockSubscriber();
        TestSubscriber<String> ts = new TestSubscriber<String>(observer);
        withTimeout.subscribe(observer);
        testScheduler.advanceTimeBy(2, TimeUnit.SECONDS);
        underlyingSubject.onComplete();
        testScheduler.advanceTimeBy(2, TimeUnit.SECONDS);
        verify(observer).onComplete();
        verify(observer, never()).onError(any(Throwable.class));
        ts.dispose();
    }

    @Test
    public void shouldErrorIfUnderlyingErrors() {
        Subscriber<String> observer = TestHelper.mockSubscriber();
        TestSubscriber<String> ts = new TestSubscriber<String>(observer);
        withTimeout.subscribe(observer);
        testScheduler.advanceTimeBy(2, TimeUnit.SECONDS);
        underlyingSubject.onError(new UnsupportedOperationException());
        testScheduler.advanceTimeBy(2, TimeUnit.SECONDS);
        verify(observer).onError(any(UnsupportedOperationException.class));
        ts.dispose();
    }

    @Test
    public void shouldSwitchToOtherIfOnNextNotWithinTimeout() {
        Flowable<String> other = Flowable.just("a", "b", "c");
        Flowable<String> source = underlyingSubject.timeout(TIMEOUT, TIME_UNIT, testScheduler, other);

        Subscriber<String> observer = TestHelper.mockSubscriber();
        TestSubscriber<String> ts = new TestSubscriber<String>(observer);
        source.subscribe(ts);

        testScheduler.advanceTimeBy(2, TimeUnit.SECONDS);
        underlyingSubject.onNext("One");
        testScheduler.advanceTimeBy(4, TimeUnit.SECONDS);
        underlyingSubject.onNext("Two");
        InOrder inOrder = inOrder(observer);
        inOrder.verify(observer, times(1)).onNext("One");
        inOrder.verify(observer, times(1)).onNext("a");
        inOrder.verify(observer, times(1)).onNext("b");
        inOrder.verify(observer, times(1)).onNext("c");
        inOrder.verify(observer, times(1)).onComplete();
        inOrder.verifyNoMoreInteractions();
        ts.dispose();
    }

    @Test
    public void shouldSwitchToOtherIfOnErrorNotWithinTimeout() {
        Flowable<String> other = Flowable.just("a", "b", "c");
        Flowable<String> source = underlyingSubject.timeout(TIMEOUT, TIME_UNIT, testScheduler, other);

        Subscriber<String> observer = TestHelper.mockSubscriber();
        TestSubscriber<String> ts = new TestSubscriber<String>(observer);
        source.subscribe(ts);

        testScheduler.advanceTimeBy(2, TimeUnit.SECONDS);
        underlyingSubject.onNext("One");
        testScheduler.advanceTimeBy(4, TimeUnit.SECONDS);
        underlyingSubject.onError(new UnsupportedOperationException());
        InOrder inOrder = inOrder(observer);
        inOrder.verify(observer, times(1)).onNext("One");
        inOrder.verify(observer, times(1)).onNext("a");
        inOrder.verify(observer, times(1)).onNext("b");
        inOrder.verify(observer, times(1)).onNext("c");
        inOrder.verify(observer, times(1)).onComplete();
        inOrder.verifyNoMoreInteractions();
        ts.dispose();
    }

    @Test
    public void shouldSwitchToOtherIfOnCompletedNotWithinTimeout() {
        Flowable<String> other = Flowable.just("a", "b", "c");
        Flowable<String> source = underlyingSubject.timeout(TIMEOUT, TIME_UNIT, testScheduler, other);

        Subscriber<String> observer = TestHelper.mockSubscriber();
        TestSubscriber<String> ts = new TestSubscriber<String>(observer);
        source.subscribe(ts);

        testScheduler.advanceTimeBy(2, TimeUnit.SECONDS);
        underlyingSubject.onNext("One");
        testScheduler.advanceTimeBy(4, TimeUnit.SECONDS);
        underlyingSubject.onComplete();
        InOrder inOrder = inOrder(observer);
        inOrder.verify(observer, times(1)).onNext("One");
        inOrder.verify(observer, times(1)).onNext("a");
        inOrder.verify(observer, times(1)).onNext("b");
        inOrder.verify(observer, times(1)).onNext("c");
        inOrder.verify(observer, times(1)).onComplete();
        inOrder.verifyNoMoreInteractions();
        ts.dispose();
    }

    @Test
    public void shouldSwitchToOtherAndCanBeUnsubscribedIfOnNextNotWithinTimeout() {
        PublishProcessor<String> other = PublishProcessor.create();
        Flowable<String> source = underlyingSubject.timeout(TIMEOUT, TIME_UNIT, testScheduler, other);

        Subscriber<String> observer = TestHelper.mockSubscriber();
        TestSubscriber<String> ts = new TestSubscriber<String>(observer);
        source.subscribe(ts);

        testScheduler.advanceTimeBy(2, TimeUnit.SECONDS);
        underlyingSubject.onNext("One");
        testScheduler.advanceTimeBy(4, TimeUnit.SECONDS);
        underlyingSubject.onNext("Two");

        other.onNext("a");
        other.onNext("b");
        ts.dispose();

        // The following messages should not be delivered.
        other.onNext("c");
        other.onNext("d");
        other.onComplete();

        InOrder inOrder = inOrder(observer);
        inOrder.verify(observer, times(1)).onNext("One");
        inOrder.verify(observer, times(1)).onNext("a");
        inOrder.verify(observer, times(1)).onNext("b");
        inOrder.verifyNoMoreInteractions();
    }

    @Test
    public void shouldTimeoutIfSynchronizedFlowableEmitFirstOnNextNotWithinTimeout()
            throws InterruptedException {
        final CountDownLatch exit = new CountDownLatch(1);
        final CountDownLatch timeoutSetuped = new CountDownLatch(1);

        final Subscriber<String> observer = TestHelper.mockSubscriber();
        final TestSubscriber<String> ts = new TestSubscriber<String>(observer);

        new Thread(new Runnable() {

            @Override
            public void run() {
                Flowable.unsafeCreate(new Publisher<String>() {

                    @Override
                    public void subscribe(Subscriber<? super String> subscriber) {
                        subscriber.onSubscribe(new BooleanSubscription());
                        try {
                            timeoutSetuped.countDown();
                            exit.await();
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                        subscriber.onNext("a");
                        subscriber.onComplete();
                    }

                }).timeout(1, TimeUnit.SECONDS, testScheduler)
                        .subscribe(ts);
            }
        }).start();

        timeoutSetuped.await();
        testScheduler.advanceTimeBy(2, TimeUnit.SECONDS);

        InOrder inOrder = inOrder(observer);
        inOrder.verify(observer, times(1)).onError(isA(TimeoutException.class));
        inOrder.verifyNoMoreInteractions();

        exit.countDown(); // exit the thread
    }

    @Test
    public void shouldUnsubscribeFromUnderlyingSubscriptionOnTimeout() throws InterruptedException {
        // From https://github.com/ReactiveX/RxJava/pull/951
        final Subscription s = mock(Subscription.class);

        Flowable<String> never = Flowable.unsafeCreate(new Publisher<String>() {
            @Override
            public void subscribe(Subscriber<? super String> subscriber) {
                subscriber.onSubscribe(s);
            }
        });

        TestScheduler testScheduler = new TestScheduler();
        Flowable<String> observableWithTimeout = never.timeout(1000, TimeUnit.MILLISECONDS, testScheduler);

        Subscriber<String> observer = TestHelper.mockSubscriber();
        TestSubscriber<String> ts = new TestSubscriber<String>(observer);
        observableWithTimeout.subscribe(ts);

        testScheduler.advanceTimeBy(2000, TimeUnit.MILLISECONDS);

        InOrder inOrder = inOrder(observer);
        inOrder.verify(observer).onError(isA(TimeoutException.class));
        inOrder.verifyNoMoreInteractions();

        verify(s, times(1)).cancel();
    }

    @Test
    @Ignore("s should be considered cancelled upon executing onComplete and not expect downstream to call cancel")
    public void shouldUnsubscribeFromUnderlyingSubscriptionOnImmediatelyComplete() {
        // From https://github.com/ReactiveX/RxJava/pull/951
        final Subscription s = mock(Subscription.class);

        Flowable<String> immediatelyComplete = Flowable.unsafeCreate(new Publisher<String>() {
            @Override
            public void subscribe(Subscriber<? super String> subscriber) {
                subscriber.onSubscribe(s);
                subscriber.onComplete();
            }
        });

        TestScheduler testScheduler = new TestScheduler();
        Flowable<String> observableWithTimeout = immediatelyComplete.timeout(1000, TimeUnit.MILLISECONDS,
                testScheduler);

        Subscriber<String> observer = TestHelper.mockSubscriber();
        TestSubscriber<String> ts = new TestSubscriber<String>(observer);
        observableWithTimeout.subscribe(ts);

        testScheduler.advanceTimeBy(2000, TimeUnit.MILLISECONDS);

        InOrder inOrder = inOrder(observer);
        inOrder.verify(observer).onComplete();
        inOrder.verifyNoMoreInteractions();

        verify(s, times(1)).cancel();
    }

    @Test
    @Ignore("s should be considered cancelled upon executing onError and not expect downstream to call cancel")
    public void shouldUnsubscribeFromUnderlyingSubscriptionOnImmediatelyErrored() throws InterruptedException {
        // From https://github.com/ReactiveX/RxJava/pull/951
        final Subscription s = mock(Subscription.class);

        Flowable<String> immediatelyError = Flowable.unsafeCreate(new Publisher<String>() {
            @Override
            public void subscribe(Subscriber<? super String> subscriber) {
                subscriber.onSubscribe(s);
                subscriber.onError(new IOException("Error"));
            }
        });

        TestScheduler testScheduler = new TestScheduler();
        Flowable<String> observableWithTimeout = immediatelyError.timeout(1000, TimeUnit.MILLISECONDS,
                testScheduler);

        Subscriber<String> observer = TestHelper.mockSubscriber();
        TestSubscriber<String> ts = new TestSubscriber<String>(observer);
        observableWithTimeout.subscribe(ts);

        testScheduler.advanceTimeBy(2000, TimeUnit.MILLISECONDS);

        InOrder inOrder = inOrder(observer);
        inOrder.verify(observer).onError(isA(IOException.class));
        inOrder.verifyNoMoreInteractions();

        verify(s, times(1)).cancel();
    }

    @Test
    public void shouldUnsubscribeFromUnderlyingSubscriptionOnDispose() {
        final PublishProcessor<String> subject = PublishProcessor.create();
        final TestScheduler scheduler = new TestScheduler();

        final TestSubscriber<String> observer = subject
                .timeout(100, TimeUnit.MILLISECONDS, scheduler)
                .test();

        assertTrue(subject.hasSubscribers());

        observer.dispose();

        assertFalse(subject.hasSubscribers());
    }

    @Test
    public void timedAndOther() {
        Flowable.never().timeout(100, TimeUnit.MILLISECONDS, Flowable.just(1))
        .test()
        .awaitDone(5, TimeUnit.SECONDS)
        .assertResult(1);
    }

    @Test
    public void disposed() {
        TestHelper.checkDisposed(PublishProcessor.create().timeout(1, TimeUnit.DAYS));

        TestHelper.checkDisposed(PublishProcessor.create().timeout(1, TimeUnit.DAYS, Flowable.just(1)));
    }

    @Test
    public void timedErrorOther() {
        Flowable.error(new TestException())
        .timeout(1, TimeUnit.DAYS, Flowable.just(1))
        .test()
        .assertFailure(TestException.class);
    }

    @Test
    public void timedError() {
        Flowable.error(new TestException())
        .timeout(1, TimeUnit.DAYS)
        .test()
        .assertFailure(TestException.class);
    }

    @Test
    public void timedEmptyOther() {
        Flowable.empty()
        .timeout(1, TimeUnit.DAYS, Flowable.just(1))
        .test()
        .assertResult();
    }

    @Test
    public void timedEmpty() {
        Flowable.empty()
        .timeout(1, TimeUnit.DAYS)
        .test()
        .assertResult();
    }

    @Test
    public void badSource() {
        List<Throwable> errors = TestHelper.trackPluginErrors();
        try {
            new Flowable<Integer>() {
                @Override
                protected void subscribeActual(Subscriber<? super Integer> observer) {
                    observer.onSubscribe(new BooleanSubscription());

                    observer.onNext(1);
                    observer.onComplete();
                    observer.onNext(2);
                    observer.onError(new TestException());
                    observer.onComplete();
                }
            }
            .timeout(1, TimeUnit.DAYS)
            .test()
            .assertResult(1);

            TestHelper.assertUndeliverable(errors, 0, TestException.class);
        } finally {
            RxJavaPlugins.reset();
        }
    }

    @Test
    public void badSourceOther() {
        List<Throwable> errors = TestHelper.trackPluginErrors();
        try {
            new Flowable<Integer>() {
                @Override
                protected void subscribeActual(Subscriber<? super Integer> observer) {
                    observer.onSubscribe(new BooleanSubscription());

                    observer.onNext(1);
                    observer.onComplete();
                    observer.onNext(2);
                    observer.onError(new TestException());
                    observer.onComplete();
                }
            }
            .timeout(1, TimeUnit.DAYS, Flowable.just(3))
            .test()
            .assertResult(1);

            TestHelper.assertUndeliverable(errors, 0, TestException.class);
        } finally {
            RxJavaPlugins.reset();
        }
    }


    @Test
    public void timedTake() {
        PublishProcessor<Integer> pp = PublishProcessor.create();

        TestSubscriber<Integer> ts = pp.timeout(1, TimeUnit.DAYS)
        .take(1)
        .test();

        assertTrue(pp.hasSubscribers());

        pp.onNext(1);

        assertFalse(pp.hasSubscribers());

        ts.assertResult(1);
    }

    @Test
    public void timedFallbackTake() {
        PublishProcessor<Integer> pp = PublishProcessor.create();

        TestSubscriber<Integer> ts = pp.timeout(1, TimeUnit.DAYS, Flowable.just(2))
        .take(1)
        .test();

        assertTrue(pp.hasSubscribers());

        pp.onNext(1);

        assertFalse(pp.hasSubscribers());

        ts.assertResult(1);
    }

    @Test
    public void fallbackErrors() {
        Flowable.never()
        .timeout(1, TimeUnit.MILLISECONDS, Flowable.error(new TestException()))
        .test()
        .awaitDone(5, TimeUnit.SECONDS)
        .assertFailure(TestException.class);
    }

    @Test
    public void onNextOnTimeoutRace() {
        for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
            final TestScheduler sch = new TestScheduler();

            final PublishProcessor<Integer> pp = PublishProcessor.create();

            TestSubscriber<Integer> ts = pp.timeout(1, TimeUnit.SECONDS, sch).test();

            Runnable r1 = new Runnable() {
                @Override
                public void run() {
                    pp.onNext(1);
                }
            };

            Runnable r2 = new Runnable() {
                @Override
                public void run() {
                    sch.advanceTimeBy(1, TimeUnit.SECONDS);
                }
            };

            TestHelper.race(r1, r2);

            if (ts.valueCount() != 0) {
                if (ts.errorCount() != 0) {
                    ts.assertFailure(TimeoutException.class, 1);
                } else {
                    ts.assertValuesOnly(1);
                }
            } else {
                ts.assertFailure(TimeoutException.class);
            }
        }
    }

    @Test
    public void onNextOnTimeoutRaceFallback() {
        for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
            final TestScheduler sch = new TestScheduler();

            final PublishProcessor<Integer> pp = PublishProcessor.create();

            TestSubscriber<Integer> ts = pp.timeout(1, TimeUnit.SECONDS, sch, Flowable.just(2)).test();

            Runnable r1 = new Runnable() {
                @Override
                public void run() {
                    pp.onNext(1);
                }
            };

            Runnable r2 = new Runnable() {
                @Override
                public void run() {
                    sch.advanceTimeBy(1, TimeUnit.SECONDS);
                }
            };

            TestHelper.race(r1, r2);

            if (ts.isTerminated()) {
                int c = ts.valueCount();
                if (c == 1) {
                    int v = ts.values().get(0);
                    assertTrue("" + v, v == 1 || v == 2);
                } else {
                    ts.assertResult(1, 2);
                }
            } else {
                ts.assertValuesOnly(1);
            }
        }
    }
}
