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/*
 * Copyright (c) 2011-2018 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.
 */

/*
 * 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.time.Duration;
import java.util.Objects;
import java.util.function.Supplier;

import reactor.core.CoreSubscriber;
import reactor.core.Exceptions;
import reactor.core.Fuseable;

/**
 * Emits a lazily generated {@link Throwable} instance to Subscribers, via a {@link Supplier}.
 *
 * @param  the value type
 * @see Reactive-Streams-Commons
 */
final class MonoErrorSupplied extends Mono implements Fuseable.ScalarCallable, SourceProducer {

	final Supplier errorSupplier;

	MonoErrorSupplied(Supplier errorSupplier) {
		this.errorSupplier = Objects.requireNonNull(errorSupplier, "errorSupplier");
	}

	@Override
	public T block(Duration m) {
		Throwable error = Objects.requireNonNull(errorSupplier.get(), "the errorSupplier returned null");
		throw Exceptions.propagate(error);
	}

	@Override
	public T block() {
		Throwable error = Objects.requireNonNull(errorSupplier.get(), "the errorSupplier returned null");
		throw Exceptions.propagate(error);
	}

	@Override
	public void subscribe(CoreSubscriber actual) {
		Throwable error = Objects.requireNonNull(errorSupplier.get(), "the errorSupplier returned null");
		Operators.error(actual, Operators.onOperatorError(error, actual.currentContext()));
	}

	@Override
	public Object call() throws Exception {
		Throwable error = Objects.requireNonNull(errorSupplier.get(), "the errorSupplier returned null");
		if(error instanceof Exception){
			throw ((Exception) error);
		}
		throw Exceptions.propagate(error);
	}

	@Override
	public Object scanUnsafe(Attr key) {
		return null; //no particular key to be represented, still useful in hooks
	}
}