/*
    * 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.resolver.internal.ant;
  
  import java.io.File;
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Set;
  
  import org.apache.maven.model.Dependency;
  import org.apache.maven.model.Parent;
  import org.apache.maven.model.Repository;
  import org.apache.maven.model.building.FileModelSource;
  import org.apache.maven.model.building.ModelSource;
  import org.apache.maven.model.resolution.InvalidRepositoryException;
  import org.apache.maven.model.resolution.ModelResolver;
  import org.apache.maven.model.resolution.UnresolvableModelException;
  import org.eclipse.aether.RepositorySystem;
  import org.eclipse.aether.RepositorySystemSession;
  import org.eclipse.aether.artifact.Artifact;
  import org.eclipse.aether.artifact.DefaultArtifact;
  import org.eclipse.aether.impl.RemoteRepositoryManager;
  import org.eclipse.aether.repository.RemoteRepository;
  import org.eclipse.aether.repository.RepositoryPolicy;
  import org.eclipse.aether.resolution.ArtifactRequest;
  import org.eclipse.aether.resolution.ArtifactResolutionException;
  
  /**
   * A model resolver to assist building of dependency POMs. This resolver gives priority to those repositories that have
   * been initially specified and repositories discovered in dependency POMs are recessively merged into the search chain.
   *
   */
  class AntModelResolver implements ModelResolver {
  
      private final RepositorySystemSession session;
  
      private final String context;
  
      private List<org.eclipse.aether.repository.RemoteRepository> repositories;
  
      private final RepositorySystem repoSys;
  
      private final RemoteRepositoryManager remoteRepositoryManager;
  
      private final Set<String> repositoryIds;
  
      AntModelResolver(
              final RepositorySystemSession session,
              final String context,
              final RepositorySystem repoSys,
              final RemoteRepositoryManager remoteRepositoryManager,
              final List<RemoteRepository> repositories) {
          this.session = session;
          this.context = context;
          this.repoSys = repoSys;
          this.remoteRepositoryManager = remoteRepositoryManager;
          this.repositories = repositories;
          this.repositoryIds = new HashSet<>();
      }
  
      private AntModelResolver(final AntModelResolver original) {
          this.session = original.session;
          this.context = original.context;
          this.repoSys = original.repoSys;
          this.remoteRepositoryManager = original.remoteRepositoryManager;
          this.repositories = original.repositories;
          this.repositoryIds = new HashSet<>(original.repositoryIds);
      }
  
      public void addRepository(final Repository repository) throws InvalidRepositoryException {
          if (!repositoryIds.add(repository.getId())) {
              return;
          }
  
          final List<RemoteRepository> newRepositories = Collections.singletonList(convert(repository));
  
          this.repositories = remoteRepositoryManager.aggregateRepositories(session, repositories, newRepositories, true);
      }
  
      static RemoteRepository convert(final Repository repository) {
          final RemoteRepository.Builder builder =
                  new RemoteRepository.Builder(repository.getId(), repository.getLayout(), repository.getUrl());
         builder.setSnapshotPolicy(convert(repository.getSnapshots()));
         builder.setReleasePolicy(convert(repository.getReleases()));
         return builder.build();
     }
 
     private static RepositoryPolicy convert(final org.apache.maven.model.RepositoryPolicy policy) {
         boolean enabled = true;
         String checksums = RepositoryPolicy.CHECKSUM_POLICY_WARN;
         String updates = RepositoryPolicy.UPDATE_POLICY_DAILY;
 
         if (policy != null) {
             enabled = policy.isEnabled();
             if (policy.getUpdatePolicy() != null) {
                 updates = policy.getUpdatePolicy();
             }
             if (policy.getChecksumPolicy() != null) {
                 checksums = policy.getChecksumPolicy();
             }
         }
 
         return new RepositoryPolicy(enabled, updates, checksums);
     }
 
     public ModelResolver newCopy() {
         return new AntModelResolver(this);
     }
 
     public ModelSource resolveModel(final String groupId, final String artifactId, final String version)
             throws UnresolvableModelException {
         Artifact pomArtifact = new DefaultArtifact(groupId, artifactId, "", "pom", version);
 
         try {
             final ArtifactRequest request = new ArtifactRequest(pomArtifact, repositories, context);
             pomArtifact = repoSys.resolveArtifact(session, request).getArtifact();
         } catch (final ArtifactResolutionException e) {
             throw new UnresolvableModelException(
                     "Failed to resolve POM for " + groupId + ":" + artifactId + ":" + version + " due to "
                             + e.getMessage(),
                     groupId,
                     artifactId,
                     version,
                     e);
         }
 
         final File pomFile = pomArtifact.getFile();
 
         return new FileModelSource(pomFile);
     }
 
     @Override
     public ModelSource resolveModel(final Parent parent) throws UnresolvableModelException {
         return resolveModel(parent.getGroupId(), parent.getArtifactId(), parent.getVersion());
     }
 
     @Override
     public ModelSource resolveModel(final Dependency dependency) throws UnresolvableModelException {
         return resolveModel(dependency.getGroupId(), dependency.getArtifactId(), dependency.getVersion());
     }
 
     @Override
     public void addRepository(final Repository repository, final boolean replace) throws InvalidRepositoryException {
         addRepository(repository);
     }
 }