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/*
 * Copyright (c) 2011-2017 Pivotal Software Inc, 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
 *
 *       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 reactor.core.publisher;

import java.util.Objects;
import java.util.function.Function;

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

import static reactor.core.publisher.FluxTimeout.addNameToTimeoutDescription;

/**
 * Signals a timeout (or switches to another sequence) in case a per-item generated
 * Publisher source fires an item or completes before the next item arrives from the main
 * source.
 *
 * @param  the main source type
 * @param  the value type for the timeout for the very first item
 * @param  the value type for the timeout for the subsequent items
 * @see Reactive-Streams-Commons
 */
final class MonoTimeout extends MonoOperator {

	final Publisher firstTimeout;

	final Publisher other;
	final String timeoutDescription; //only useful when no `other`

	@SuppressWarnings("rawtypes")
    final static Function NEVER = e -> Flux.never();

	MonoTimeout(Mono source,
			Publisher firstTimeout,
			String timeoutDescription) {
		super(source);
		this.firstTimeout = Objects.requireNonNull(firstTimeout, "firstTimeout");
		this.other = null;
		this.timeoutDescription = timeoutDescription;
	}

	MonoTimeout(Mono source,
			Publisher firstTimeout,
			Publisher other) {
		super(source);
		this.firstTimeout = Objects.requireNonNull(firstTimeout, "firstTimeout");
		this.other = Objects.requireNonNull(other, "other");
		this.timeoutDescription = null;
	}

	@Override
	@SuppressWarnings("unchecked")
	public void subscribe(CoreSubscriber actual) {

		CoreSubscriber serial = Operators.serialize(actual);

		FluxTimeout.TimeoutMainSubscriber main =
				new FluxTimeout.TimeoutMainSubscriber<>(serial, NEVER, other,
						addNameToTimeoutDescription(source, timeoutDescription));

		serial.onSubscribe(main);

		FluxTimeout.TimeoutTimeoutSubscriber ts =
				new FluxTimeout.TimeoutTimeoutSubscriber(main, 0L);

		main.setTimeout(ts);

		firstTimeout.subscribe(ts);

		source.subscribe(main);
	}
}