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/*
 * 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.rxjava3.internal.operators.observable;

import java.util.Objects;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.atomic.*;

import io.reactivex.rxjava3.core.*;
import io.reactivex.rxjava3.disposables.Disposable;
import io.reactivex.rxjava3.exceptions.Exceptions;
import io.reactivex.rxjava3.functions.Function;
import io.reactivex.rxjava3.internal.disposables.*;
import io.reactivex.rxjava3.internal.operators.observable.ObservableTimeoutTimed.TimeoutSupport;
import io.reactivex.rxjava3.plugins.RxJavaPlugins;

public final class ObservableTimeout extends AbstractObservableWithUpstream {
    final ObservableSource firstTimeoutIndicator;
    final Function> itemTimeoutIndicator;
    final ObservableSource other;

    public ObservableTimeout(
            Observable source,
            ObservableSource firstTimeoutIndicator,
            Function> itemTimeoutIndicator,
            ObservableSource other) {
        super(source);
        this.firstTimeoutIndicator = firstTimeoutIndicator;
        this.itemTimeoutIndicator = itemTimeoutIndicator;
        this.other = other;
    }

    @Override
    protected void subscribeActual(Observer observer) {
        if (other == null) {
            TimeoutObserver parent = new TimeoutObserver<>(observer, itemTimeoutIndicator);
            observer.onSubscribe(parent);
            parent.startFirstTimeout(firstTimeoutIndicator);
            source.subscribe(parent);
        } else {
            TimeoutFallbackObserver parent = new TimeoutFallbackObserver<>(observer, itemTimeoutIndicator, other);
            observer.onSubscribe(parent);
            parent.startFirstTimeout(firstTimeoutIndicator);
            source.subscribe(parent);
        }
    }

    interface TimeoutSelectorSupport extends TimeoutSupport {
        void onTimeoutError(long idx, Throwable ex);
    }

    static final class TimeoutObserver extends AtomicLong
    implements Observer, Disposable, TimeoutSelectorSupport {

        private static final long serialVersionUID = 3764492702657003550L;

        final Observer downstream;

        final Function> itemTimeoutIndicator;

        final SequentialDisposable task;

        final AtomicReference upstream;

        TimeoutObserver(Observer actual, Function> itemTimeoutIndicator) {
            this.downstream = actual;
            this.itemTimeoutIndicator = itemTimeoutIndicator;
            this.task = new SequentialDisposable();
            this.upstream = new AtomicReference<>();
        }

        @Override
        public void onSubscribe(Disposable d) {
            DisposableHelper.setOnce(upstream, d);
        }

        @Override
        public void onNext(T t) {
            long idx = get();
            if (idx == Long.MAX_VALUE || !compareAndSet(idx, idx + 1)) {
                return;
            }

            Disposable d = task.get();
            if (d != null) {
                d.dispose();
            }

            downstream.onNext(t);

            ObservableSource itemTimeoutObservableSource;

            try {
                itemTimeoutObservableSource = Objects.requireNonNull(
                        itemTimeoutIndicator.apply(t),
                        "The itemTimeoutIndicator returned a null ObservableSource.");
            } catch (Throwable ex) {
                Exceptions.throwIfFatal(ex);
                upstream.get().dispose();
                getAndSet(Long.MAX_VALUE);
                downstream.onError(ex);
                return;
            }

            TimeoutConsumer consumer = new TimeoutConsumer(idx + 1, this);
            if (task.replace(consumer)) {
                itemTimeoutObservableSource.subscribe(consumer);
            }
        }

        void startFirstTimeout(ObservableSource firstTimeoutIndicator) {
            if (firstTimeoutIndicator != null) {
                TimeoutConsumer consumer = new TimeoutConsumer(0L, this);
                if (task.replace(consumer)) {
                    firstTimeoutIndicator.subscribe(consumer);
                }
            }
        }

        @Override
        public void onError(Throwable t) {
            if (getAndSet(Long.MAX_VALUE) != Long.MAX_VALUE) {
                task.dispose();

                downstream.onError(t);
            } else {
                RxJavaPlugins.onError(t);
            }
        }

        @Override
        public void onComplete() {
            if (getAndSet(Long.MAX_VALUE) != Long.MAX_VALUE) {
                task.dispose();

                downstream.onComplete();
            }
        }

        @Override
        public void onTimeout(long idx) {
            if (compareAndSet(idx, Long.MAX_VALUE)) {
                DisposableHelper.dispose(upstream);

                downstream.onError(new TimeoutException());
            }
        }

        @Override
        public void onTimeoutError(long idx, Throwable ex) {
            if (compareAndSet(idx, Long.MAX_VALUE)) {
                DisposableHelper.dispose(upstream);

                downstream.onError(ex);
            } else {
                RxJavaPlugins.onError(ex);
            }
        }

        @Override
        public void dispose() {
            DisposableHelper.dispose(upstream);
            task.dispose();
        }

        @Override
        public boolean isDisposed() {
            return DisposableHelper.isDisposed(upstream.get());
        }
    }

    static final class TimeoutFallbackObserver
    extends AtomicReference
    implements Observer, Disposable, TimeoutSelectorSupport {

        private static final long serialVersionUID = -7508389464265974549L;

        final Observer downstream;

        final Function> itemTimeoutIndicator;

        final SequentialDisposable task;

        final AtomicLong index;

        final AtomicReference upstream;

        ObservableSource fallback;

        TimeoutFallbackObserver(Observer actual,
                Function> itemTimeoutIndicator,
                        ObservableSource fallback) {
            this.downstream = actual;
            this.itemTimeoutIndicator = itemTimeoutIndicator;
            this.task = new SequentialDisposable();
            this.fallback = fallback;
            this.index = new AtomicLong();
            this.upstream = new AtomicReference<>();
        }

        @Override
        public void onSubscribe(Disposable d) {
            DisposableHelper.setOnce(upstream, d);
        }

        @Override
        public void onNext(T t) {
            long idx = index.get();
            if (idx == Long.MAX_VALUE || !index.compareAndSet(idx, idx + 1)) {
                return;
            }

            Disposable d = task.get();
            if (d != null) {
                d.dispose();
            }

            downstream.onNext(t);

            ObservableSource itemTimeoutObservableSource;

            try {
                itemTimeoutObservableSource = Objects.requireNonNull(
                        itemTimeoutIndicator.apply(t),
                        "The itemTimeoutIndicator returned a null ObservableSource.");
            } catch (Throwable ex) {
                Exceptions.throwIfFatal(ex);
                upstream.get().dispose();
                index.getAndSet(Long.MAX_VALUE);
                downstream.onError(ex);
                return;
            }

            TimeoutConsumer consumer = new TimeoutConsumer(idx + 1, this);
            if (task.replace(consumer)) {
                itemTimeoutObservableSource.subscribe(consumer);
            }
        }

        void startFirstTimeout(ObservableSource firstTimeoutIndicator) {
            if (firstTimeoutIndicator != null) {
                TimeoutConsumer consumer = new TimeoutConsumer(0L, this);
                if (task.replace(consumer)) {
                    firstTimeoutIndicator.subscribe(consumer);
                }
            }
        }

        @Override
        public void onError(Throwable t) {
            if (index.getAndSet(Long.MAX_VALUE) != Long.MAX_VALUE) {
                task.dispose();

                downstream.onError(t);

                task.dispose();
            } else {
                RxJavaPlugins.onError(t);
            }
        }

        @Override
        public void onComplete() {
            if (index.getAndSet(Long.MAX_VALUE) != Long.MAX_VALUE) {
                task.dispose();

                downstream.onComplete();

                task.dispose();
            }
        }

        @Override
        public void onTimeout(long idx) {
            if (index.compareAndSet(idx, Long.MAX_VALUE)) {
                DisposableHelper.dispose(upstream);

                ObservableSource f = fallback;
                fallback = null;

                f.subscribe(new ObservableTimeoutTimed.FallbackObserver(downstream, this));
            }
        }

        @Override
        public void onTimeoutError(long idx, Throwable ex) {
            if (index.compareAndSet(idx, Long.MAX_VALUE)) {
                DisposableHelper.dispose(this);

                downstream.onError(ex);
            } else {
                RxJavaPlugins.onError(ex);
            }
        }

        @Override
        public void dispose() {
            DisposableHelper.dispose(upstream);
            DisposableHelper.dispose(this);
            task.dispose();
        }

        @Override
        public boolean isDisposed() {
            return DisposableHelper.isDisposed(get());
        }
    }

    static final class TimeoutConsumer extends AtomicReference
    implements Observer