/*
 * Copyright contributors to Hyperledger Besu.
 *
 * 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.
 *
 * SPDX-License-Identifier: Apache-2.0
 */
package org.hyperledger.besu.consensus.merge;

import java.util.Optional;
import java.util.function.Supplier;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/** The Unverified forkchoice supplier. */
public class UnverifiedForkchoiceSupplier
    implements Supplier<Optional<ForkchoiceEvent>>, UnverifiedForkchoiceListener {
  private static final Logger LOG = LoggerFactory.getLogger(UnverifiedForkchoiceSupplier.class);

  private volatile Optional<ForkchoiceEvent> maybeLastForkchoiceUpdate = Optional.empty();

  /** Default Constructor. */
  public UnverifiedForkchoiceSupplier() {}

  @Override
  public void onNewUnverifiedForkchoice(final ForkchoiceEvent event) {
    maybeLastForkchoiceUpdate = Optional.of(event);
    LOG.debug("New forkchoice announced {}", maybeLastForkchoiceUpdate);
  }

  @Override
  public Optional<ForkchoiceEvent> get() {
    return maybeLastForkchoiceUpdate;
  }
}
