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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.Predicate;

import org.reactivestreams.Subscription;
import reactor.core.CoreSubscriber;
import reactor.util.annotation.Nullable;

/**
 * Relays values until a predicate returns
 * true, indicating the sequence should stop
 * (checked after each value has been delivered).
 *
 * @param  the value type
 * @see Reactive-Streams-Commons
 */
final class FluxTakeUntil extends InternalFluxOperator {

	final Predicate predicate;

	FluxTakeUntil(Flux source, Predicate predicate) {
		super(source);
		this.predicate = Objects.requireNonNull(predicate, "predicate");
	}

	@Override
	public CoreSubscriber subscribeOrReturn(CoreSubscriber actual) {
		return new TakeUntilPredicateSubscriber<>(actual, predicate);
	}

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

	static final class TakeUntilPredicateSubscriber
			implements InnerOperator {
		final CoreSubscriber actual;

		final Predicate predicate;

		Subscription s;

		boolean done;

		TakeUntilPredicateSubscriber(CoreSubscriber actual, Predicate predicate) {
			this.actual = actual;
			this.predicate = predicate;
		}

		@Override
		public void onSubscribe(Subscription s) {
			if (Operators.validate(this.s, s)) {
				this.s = s;
				actual.onSubscribe(this);
			}
		}

		@Override
		public void onNext(T t) {
			if (done) {
				Operators.onNextDropped(t, actual.currentContext());
				return;
			}

			boolean b;

			try {
				b = predicate.test(t);
			} catch (Throwable e) {
				actual.onNext(t);
				onError(Operators.onOperatorError(s, e, t, actual.currentContext()));

				return;
			}

			actual.onNext(t);

			if (b) {
				s.cancel();

				onComplete();
			}
		}

		@Override
		public void onError(Throwable t) {
			if (done) {
				Operators.onErrorDropped(t, actual.currentContext());
				return;
			}
			done = true;

			actual.onError(t);
		}

		@Override
		public void onComplete() {
			if (done) {
				return;
			}
			done = true;

			actual.onComplete();
		}

		@Override
		@Nullable
		public Object scanUnsafe(Attr key) {
			if (key == Attr.TERMINATED) return done;
			if (key == Attr.PARENT) return s;
			if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;

			return InnerOperator.super.scanUnsafe(key);
		}

		@Override
		public CoreSubscriber actual() {
			return actual;
		}

		@Override
		public void request(long n) {
			s.request(n);
		}
		
		@Override
		public void cancel() {
			s.cancel();
		}
	}
}