/*
    * 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.maven.internal.impl;
  
  import java.util.List;
  import java.util.Optional;
  
  import org.apache.maven.api.Repository;
  import org.apache.maven.api.Version;
  import org.apache.maven.api.di.Inject;
  import org.apache.maven.api.di.Named;
  import org.apache.maven.api.di.Singleton;
  import org.apache.maven.api.services.VersionResolver;
  import org.apache.maven.api.services.VersionResolverException;
  import org.apache.maven.api.services.VersionResolverRequest;
  import org.apache.maven.api.services.VersionResolverResult;
  import org.eclipse.aether.RepositorySystem;
  import org.eclipse.aether.resolution.VersionRequest;
  import org.eclipse.aether.resolution.VersionResolutionException;
  import org.eclipse.aether.resolution.VersionResult;
  
  import static org.apache.maven.internal.impl.Utils.nonNull;
  
  @Named
  @Singleton
  public class DefaultVersionResolver implements VersionResolver {
  
      private final RepositorySystem repositorySystem;
  
      @Inject
      public DefaultVersionResolver(RepositorySystem repositorySystem) {
          this.repositorySystem = repositorySystem;
      }
  
      @Override
      public VersionResolverResult resolve(VersionResolverRequest request) throws VersionResolverException {
          nonNull(request, "request");
          InternalSession session = InternalSession.from(request.getSession());
  
          try {
              VersionResult res = repositorySystem.resolveVersion(
                      session.getSession(),
                      new VersionRequest(
                              session.toArtifact(request.getArtifactCoordinates()),
                              session.toRepositories(
                                      request.getRepositories() != null
                                              ? request.getRepositories()
                                              : session.getRemoteRepositories()),
                              null));
  
              return new VersionResolverResult() {
                  @Override
                  public List<Exception> getExceptions() {
                      return res.getExceptions();
                  }
  
                  @Override
                  public Version getVersion() {
                      return session.parseVersion(res.getVersion());
                  }
  
                  @Override
                  public Optional<Repository> getRepository() {
                      if (res.getRepository() instanceof org.eclipse.aether.repository.LocalRepository) {
                          return Optional.of(new DefaultLocalRepository(
                                  (org.eclipse.aether.repository.LocalRepository) res.getRepository()));
                      } else if (res.getRepository() instanceof org.eclipse.aether.repository.RemoteRepository) {
                          return Optional.of(new DefaultRemoteRepository(
                                  (org.eclipse.aether.repository.RemoteRepository) res.getRepository()));
                      } else {
                          return Optional.empty();
                      }
                  }
              };
          } catch (VersionResolutionException e) {
              throw new VersionResolverException("Unable to resolve version", e);
          }
      }
  }