content: /*
   *  Licensed to the Apache Software Foundation (ASF) under one
   *  or more contributor license agreements.  See the NOTICE file
   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you 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 org.apache.causeway.core.metamodel.services.health;
  
  import java.util.Optional;
  
  import jakarta.annotation.Priority;
  import jakarta.inject.Named;
  
  import org.springframework.beans.factory.annotation.Qualifier;
  import org.springframework.stereotype.Service;
  
  import org.apache.causeway.applib.annotation.PriorityPrecedence;
  import org.apache.causeway.applib.services.health.Health;
  import org.apache.causeway.applib.services.health.HealthCheckService;
  import org.apache.causeway.commons.functional.Try;
  import org.apache.causeway.core.metamodel.CausewayModuleCoreMetamodel;
  import org.apache.causeway.core.metamodel.context.MetaModelContext;
  import org.apache.causeway.core.metamodel.specloader.validator.ValidationFailures;
  
  import lombok.extern.log4j.Log4j2;
  
  /**
   * Implementation of {@link HealthCheckService} that checks if the metamodel has been built, and if so whether
   * there were any {@link ValidationFailures}.
   *
   * @since 2.2 {@index}
   */
  @Service
  @Named(CausewayModuleCoreMetamodel.NAMESPACE + ".HealthCheckServiceForMetaModelValidationFailures")
  @Priority(PriorityPrecedence.MIDPOINT)
  @Qualifier("Default")
  @Log4j2
  public class HealthCheckServiceForMetaModelValidationFailures implements HealthCheckService {
  
      @Override
      public Health check() {
          return Try.call(HealthCheckServiceForMetaModelValidationFailures::metaModelValidationFailures)
                  .fold(throwableIfFailure ->
                          Health.error(ex(throwableIfFailure)),
                          HealthCheckServiceForMetaModelValidationFailures::healthFor
                  );
      }
  
      static ValidationFailures metaModelValidationFailures() {
          return MetaModelContext.instanceElseFail().getSpecificationLoader().getValidationResult().orElseThrow(() -> new RuntimeException("Not yet initialized"));
      }
  
      static Health healthFor(final Optional<ValidationFailures> validationFailuresIfSuccessIfAny) {
          return validationFailuresIfSuccessIfAny.isEmpty()
                  ? Health.error("Unable to obtain metamodel validation failures")
                  : healthFor(validationFailuresIfSuccessIfAny.get());
      }
  
      static Health healthFor(final ValidationFailures validationFailures) {
          return validationFailures.hasFailures()
                  ? Health.error(ex(validationFailures))
                  : Health.ok();
      }
  
      static Exception ex(ValidationFailures validationFailures) {
          var messages = validationFailures.getMessages("%d: %s");
          var joinedMessages = String.join("\n", messages);
          return new RuntimeException(joinedMessages);
      }
  
      static Exception ex(Throwable x) {
          return x instanceof Exception ? (Exception) x : new RuntimeException(x);
      }
  }
  