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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.observable.internal.operators;

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

import io.reactivex.common.*;
import io.reactivex.common.disposables.CompositeDisposable;
import io.reactivex.observable.*;

public final class SingleTimeout extends Single {

    final SingleSource source;

    final long timeout;

    final TimeUnit unit;

    final Scheduler scheduler;

    final SingleSource other;

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

    @Override
    protected void subscribeActual(final SingleObserver s) {

        final CompositeDisposable set = new CompositeDisposable();
        s.onSubscribe(set);

        final AtomicBoolean once = new AtomicBoolean();

        Disposable timer = scheduler.scheduleDirect(new TimeoutDispose(once, set, s), timeout, unit);

        set.add(timer);

        source.subscribe(new TimeoutObserver(once, set, s));

    }

    final class TimeoutDispose implements Runnable {
        private final AtomicBoolean once;
        final CompositeDisposable set;
        final SingleObserver s;

        TimeoutDispose(AtomicBoolean once, CompositeDisposable set, SingleObserver s) {
            this.once = once;
            this.set = set;
            this.s = s;
        }

        @Override
        public void run() {
            if (once.compareAndSet(false, true)) {
                if (other != null) {
                    set.clear();
                    other.subscribe(new TimeoutObserver());
                } else {
                    set.dispose();
                    s.onError(new TimeoutException());
                }
            }
        }

        final class TimeoutObserver implements SingleObserver {

            @Override
            public void onError(Throwable e) {
                set.dispose();
                s.onError(e);
            }

            @Override
            public void onSubscribe(Disposable d) {
                set.add(d);
            }

            @Override
            public void onSuccess(T value) {
                set.dispose();
                s.onSuccess(value);
            }

        }
    }

    final class TimeoutObserver implements SingleObserver {

        private final AtomicBoolean once;
        private final CompositeDisposable set;
        private final SingleObserver s;

        TimeoutObserver(AtomicBoolean once, CompositeDisposable set, SingleObserver s) {
            this.once = once;
            this.set = set;
            this.s = s;
        }

        @Override
        public void onError(Throwable e) {
            if (once.compareAndSet(false, true)) {
                set.dispose();
                s.onError(e);
            }
        }

        @Override
        public void onSubscribe(Disposable d) {
            set.add(d);
        }

        @Override
        public void onSuccess(T value) {
            if (once.compareAndSet(false, true)) {
                set.dispose();
                s.onSuccess(value);
            }
        }

    }
}