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.
/**
 * 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.single;

import java.util.concurrent.*;
import java.util.concurrent.atomic.AtomicReference;

import io.reactivex.*;
import io.reactivex.disposables.Disposable;
import io.reactivex.internal.disposables.DisposableHelper;
import io.reactivex.plugins.RxJavaPlugins;

import static io.reactivex.internal.util.ExceptionHelper.timeoutMessage;

public final class SingleTimeout<T> extends Single<T> {

    final SingleSource<T> source;

    final long timeout;

    final TimeUnit unit;

    final Scheduler scheduler;

    final SingleSource<? extends T> other;

    public SingleTimeout(SingleSource<T> source, long timeout, TimeUnit unit, Scheduler scheduler,
                         SingleSource<? extends T> other) {
        this.source = source;
        this.timeout = timeout;
        this.unit = unit;
        this.scheduler = scheduler;
        this.other = other;
    }

    @Override
    protected void subscribeActual(final SingleObserver<? super T> observer) {

        TimeoutMainObserver<T> parent = new TimeoutMainObserver<T>(observer, other, timeout, unit);
        observer.onSubscribe(parent);

        DisposableHelper.replace(parent.task, scheduler.scheduleDirect(parent, timeout, unit));

        source.subscribe(parent);
    }

    static final class TimeoutMainObserver<T> extends AtomicReference<Disposable>
    implements SingleObserver<T>, Runnable, Disposable {

        private static final long serialVersionUID = 37497744973048446L;

        final SingleObserver<? super T> downstream;

        final AtomicReference<Disposable> task;

        final TimeoutFallbackObserver<T> fallback;

        SingleSource<? extends T> other;

        final long timeout;

        final TimeUnit unit;

        static final class TimeoutFallbackObserver<T> extends AtomicReference<Disposable>
        implements SingleObserver<T> {

            private static final long serialVersionUID = 2071387740092105509L;
            final SingleObserver<? super T> downstream;

            TimeoutFallbackObserver(SingleObserver<? super T> downstream) {
                this.downstream = downstream;
            }

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

            @Override
            public void onSuccess(T t) {
                downstream.onSuccess(t);
            }

            @Override
            public void onError(Throwable e) {
                downstream.onError(e);
            }
        }

        TimeoutMainObserver(SingleObserver<? super T> actual, SingleSource<? extends T> other, long timeout, TimeUnit unit) {
            this.downstream = actual;
            this.other = other;
            this.timeout = timeout;
            this.unit = unit;
            this.task = new AtomicReference<Disposable>();
            if (other != null) {
                this.fallback = new TimeoutFallbackObserver<T>(actual);
            } else {
                this.fallback = null;
            }
        }

        @Override
        public void run() {
            Disposable d = get();
            if (d != DisposableHelper.DISPOSED && compareAndSet(d, DisposableHelper.DISPOSED)) {
                if (d != null) {
                    d.dispose();
                }
                SingleSource<? extends T> other = this.other;
                if (other == null) {
                    downstream.onError(new TimeoutException(timeoutMessage(timeout, unit)));
                } else {
                    this.other = null;
                    other.subscribe(fallback);
                }
            }
        }

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

        @Override
        public void onSuccess(T t) {
            Disposable d = get();
            if (d != DisposableHelper.DISPOSED && compareAndSet(d, DisposableHelper.DISPOSED)) {
                DisposableHelper.dispose(task);
                downstream.onSuccess(t);
            }
        }

        @Override
        public void onError(Throwable e) {
            Disposable d = get();
            if (d != DisposableHelper.DISPOSED && compareAndSet(d, DisposableHelper.DISPOSED)) {
                DisposableHelper.dispose(task);
                downstream.onError(e);
            } else {
                RxJavaPlugins.onError(e);
            }
        }

        @Override
        public void dispose() {
            DisposableHelper.dispose(this);
            DisposableHelper.dispose(task);
            if (fallback != null) {
                DisposableHelper.dispose(fallback);
            }
        }

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