/*
    * 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.impl;
  
  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.di.Inject;
  import org.apache.maven.api.di.Named;
  import org.apache.maven.api.di.Singleton;
  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.metadata.Metadata;
  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 java.util.Objects.requireNonNull;
  import static org.apache.maven.impl.ImplUtils.map;
  
  @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 {
          requireNonNull(request, "request");
          InternalSession session = InternalSession.from(request.getSession());
          return session.request(request, this::doResolve);
      }
  
      public VersionRangeResolverResult doResolve(VersionRangeResolverRequest request)
              throws VersionRangeResolverException {
          InternalSession session = InternalSession.from(request.getSession());
          RequestTraceHelper.ResolverTrace trace = RequestTraceHelper.enter(session, request);
          try {
              VersionRangeResult res = repositorySystem.resolveVersionRange(
                      session.getSession(),
                      new VersionRangeRequest(
                                      session.toArtifact(request.getArtifactCoordinates()),
                                      session.toResolvingRepositories(
                                              request.getRepositories() != null
                                                      ? request.getRepositories()
                                                      : session.getRemoteRepositories()),
                                      toResolver(request.getNature()),
                                      trace.context())
                              .setTrace(trace.trace()));
  
              Map<String, ArtifactRepository> repos = res.getVersions().stream()
                      .filter(v -> res.getRepository(v) != null)
                      .collect(Collectors.toMap(v -> v.toString(), res::getRepository));
  
              return new VersionRangeResolverResult() {
                  @Override
                  public VersionRangeResolverRequest getRequest() {
                      return request;
                  }
  
                  @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 localRepository) {
                         return Optional.of(new DefaultLocalRepository(localRepository));
                     } else if (repo instanceof org.eclipse.aether.repository.RemoteRepository remoteRepository) {
                         return Optional.of(new DefaultRemoteRepository(remoteRepository));
                     } else {
                         return Optional.empty();
                     }
                 }
             };
         } catch (VersionRangeResolutionException e) {
             throw new VersionRangeResolverException("Unable to resolve version range", e);
         } finally {
             RequestTraceHelper.exit(trace);
         }
     }
 
     private Metadata.Nature toResolver(VersionRangeResolverRequest.Nature nature) {
         return switch (nature) {
             case RELEASE_OR_SNAPSHOT -> Metadata.Nature.RELEASE_OR_SNAPSHOT;
             case SNAPSHOT -> Metadata.Nature.SNAPSHOT;
             case RELEASE -> Metadata.Nature.RELEASE;
         };
     }
 }