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/*
 * Copyright (c) 2016-2023 VMware Inc. or its affiliates, All Rights Reserved.
 *
 * 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
 *
 *   https://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 reactor.core.publisher;

import java.util.Objects;
import java.util.function.Consumer;

import org.reactivestreams.Publisher;
import reactor.core.CorePublisher;
import reactor.core.CoreSubscriber;

/**
 * Delays the subscription to the main source until another Publisher
 * signals a value or completes.
 *
 * @param  the main source value type
 * @param  the other source type
 * @see Reactive-Streams-Commons
 */
final class MonoDelaySubscription extends InternalMonoOperator
		implements Consumer> {

	final Publisher other;

	MonoDelaySubscription(Mono source, Publisher other) {
		super(source);
		this.other = Operators.toFluxOrMono(Objects.requireNonNull(other, "other"));
	}

	@Override
	public CoreSubscriber subscribeOrReturn(CoreSubscriber actual) {
		other.subscribe(new FluxDelaySubscription.DelaySubscriptionOtherSubscriber<>(
				actual, this));
		return null;
	}

	@Override
	public void accept(FluxDelaySubscription.DelaySubscriptionOtherSubscriber s) {
		source.subscribe(new FluxDelaySubscription.DelaySubscriptionMainSubscriber<>(s.actual, s));
	}

	@Override
	public Object scanUnsafe(Attr key) {
		if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
		return super.scanUnsafe(key);
	}
}