/*
 * Copyright Consensys Software Inc., 2022
 *
 * 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 tech.pegasys.teku.beaconrestapi.handlers.v1.beacon;

import static tech.pegasys.teku.beaconrestapi.BeaconRestApiTypes.PARAMETER_STATE_ID;

import com.fasterxml.jackson.core.JsonProcessingException;
import java.util.Optional;
import tech.pegasys.teku.api.ChainDataProvider;
import tech.pegasys.teku.infrastructure.async.SafeFuture;
import tech.pegasys.teku.infrastructure.restapi.endpoints.AsyncApiResponse;
import tech.pegasys.teku.infrastructure.restapi.endpoints.EndpointMetadata;
import tech.pegasys.teku.infrastructure.restapi.endpoints.RestApiEndpoint;
import tech.pegasys.teku.infrastructure.restapi.endpoints.RestApiRequest;
import tech.pegasys.teku.spec.datastructures.metadata.StateAndMetaData;

public abstract class AbstractGetSimpleDataFromState extends RestApiEndpoint {

  private final ChainDataProvider chainDataProvider;

  public AbstractGetSimpleDataFromState(
      final EndpointMetadata build, final ChainDataProvider chainDataProvider) {
    super(build);
    this.chainDataProvider = chainDataProvider;
  }

  @Override
  public void handleRequest(final RestApiRequest request) throws JsonProcessingException {
    final SafeFuture<Optional<StateAndMetaData>> future =
        chainDataProvider.getBeaconStateAndMetadata(request.getPathParameter(PARAMETER_STATE_ID));
    request.respondAsync(
        future.thenApply(
            maybeStateAndMetadata ->
                maybeStateAndMetadata
                    .map(AsyncApiResponse::respondOk)
                    .orElseGet(AsyncApiResponse::respondNotFound)));
  }
}
