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.completable;

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

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

public final class CompletableDelay extends Completable {

    final CompletableSource source;

    final long delay;

    final TimeUnit unit;

    final Scheduler scheduler;

    final boolean delayError;

    public CompletableDelay(CompletableSource source, long delay, TimeUnit unit, Scheduler scheduler, boolean delayError) {
        this.source = source;
        this.delay = delay;
        this.unit = unit;
        this.scheduler = scheduler;
        this.delayError = delayError;
    }

    @Override
    protected void subscribeActual(final CompletableObserver observer) {
        source.subscribe(new Delay(observer, delay, unit, scheduler, delayError));
    }

    static final class Delay extends AtomicReference<Disposable>
    implements CompletableObserver, Runnable, Disposable {

        private static final long serialVersionUID = 465972761105851022L;

        final CompletableObserver downstream;

        final long delay;

        final TimeUnit unit;

        final Scheduler scheduler;

        final boolean delayError;

        Throwable error;

        Delay(CompletableObserver downstream, long delay, TimeUnit unit, Scheduler scheduler, boolean delayError) {
            this.downstream = downstream;
            this.delay = delay;
            this.unit = unit;
            this.scheduler = scheduler;
            this.delayError = delayError;
        }

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

        @Override
        public void onComplete() {
            DisposableHelper.replace(this, scheduler.scheduleDirect(this, delay, unit));
        }

        @Override
        public void onError(final Throwable e) {
            error = e;
            DisposableHelper.replace(this, scheduler.scheduleDirect(this, delayError ? delay : 0, unit));
        }

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

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

        @Override
        public void run() {
            Throwable e = error;
            error = null;
            if (e != null) {
                downstream.onError(e);
            } else {
                downstream.onComplete();
            }
        }
    }
}