/*
    * 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 javax.inject.Inject;
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import java.util.List;
  import java.util.Map;
  import java.util.Optional;
  import java.util.stream.Collectors;
  
  import org.apache.maven.api.Repository;
  import org.apache.maven.api.Version;
  import org.apache.maven.api.services.VersionRangeResolver;
  import org.apache.maven.api.services.VersionRangeResolverException;
  import org.apache.maven.api.services.VersionRangeResolverRequest;
  import org.apache.maven.api.services.VersionRangeResolverResult;
  import org.eclipse.aether.RepositorySystem;
  import org.eclipse.aether.repository.ArtifactRepository;
  import org.eclipse.aether.resolution.VersionRangeRequest;
  import org.eclipse.aether.resolution.VersionRangeResolutionException;
  import org.eclipse.aether.resolution.VersionRangeResult;
  
  import static org.apache.maven.internal.impl.Utils.map;
  import static org.apache.maven.internal.impl.Utils.nonNull;
  
  @Named
  @Singleton
  public class DefaultVersionRangeResolver implements VersionRangeResolver {
  
      private final RepositorySystem repositorySystem;
  
      @Inject
      public DefaultVersionRangeResolver(RepositorySystem repositorySystem) {
          this.repositorySystem = repositorySystem;
      }
  
      @Override
      public VersionRangeResolverResult resolve(VersionRangeResolverRequest request)
              throws VersionRangeResolverException {
          nonNull(request, "request");
          InternalSession session = InternalSession.from(request.getSession());
  
          try {
              VersionRangeResult res = repositorySystem.resolveVersionRange(
                      session.getSession(),
                      new VersionRangeRequest(
                              session.toArtifact(request.getArtifactCoordinate()),
                              session.toRepositories(session.getRemoteRepositories()),
                              null));
  
              Map<String, ArtifactRepository> repos =
                      res.getVersions().stream().collect(Collectors.toMap(v -> v.toString(), res::getRepository));
  
              return new VersionRangeResolverResult() {
                  @Override
                  public List<Exception> getExceptions() {
                      return res.getExceptions();
                  }
  
                  @Override
                  public List<Version> getVersions() {
                      return map(res.getVersions(), v -> session.parseVersion(v.toString()));
                  }
  
                  @Override
                  public Optional<Repository> getRepository(Version version) {
                      ArtifactRepository repo = repos.get(version.toString());
                      if (repo instanceof org.eclipse.aether.repository.LocalRepository) {
                          return Optional.of(
                                  new DefaultLocalRepository((org.eclipse.aether.repository.LocalRepository) repo));
                      } else if (repo instanceof org.eclipse.aether.repository.RemoteRepository) {
                          return Optional.of(
                                  new DefaultRemoteRepository((org.eclipse.aether.repository.RemoteRepository) repo));
                      } else {
                          return Optional.empty();
                      }
                  }
              };
          } catch (VersionRangeResolutionException e) {
              throw new VersionRangeResolverException("Unable to resolve version range", e);
         }
     }
 }