/*
    * 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.artifact.repository;
  
  import java.io.File;
  import java.util.Collections;
  import java.util.List;
  import java.util.Objects;
  import org.apache.maven.RepositoryUtils;
  import org.apache.maven.artifact.metadata.ArtifactMetadata;
  import org.apache.maven.artifact.repository.layout.ArtifactRepositoryLayout;
  import org.apache.maven.artifact.repository.layout.DefaultRepositoryLayout;
  import org.apache.maven.artifact.repository.metadata.RepositoryMetadataStoreException;
  import org.apache.maven.repository.Proxy;
  import org.eclipse.aether.DefaultRepositorySystemSession;
  import org.eclipse.aether.RepositorySystem;
  import org.eclipse.aether.RepositorySystemSession;
  import org.eclipse.aether.artifact.Artifact;
  import org.eclipse.aether.metadata.Metadata;
  import org.eclipse.aether.repository.LocalArtifactRegistration;
  import org.eclipse.aether.repository.LocalArtifactRequest;
  import org.eclipse.aether.repository.LocalArtifactResult;
  import org.eclipse.aether.repository.LocalMetadataRegistration;
  import org.eclipse.aether.repository.LocalMetadataRequest;
  import org.eclipse.aether.repository.LocalMetadataResult;
  import org.eclipse.aether.repository.LocalRepository;
  import org.eclipse.aether.repository.LocalRepositoryManager;
  import org.eclipse.aether.repository.RemoteRepository;
  
  /**
   * <strong>Warning:</strong> This is an internal utility class that is only public for technical reasons, it is not part
   * of the public API. In particular, this class can be changed or deleted without prior notice.
   *
   * @author Benjamin Bentmann
   */
  public class LegacyLocalRepositoryManager implements LocalRepositoryManager {
  
      private final ArtifactRepository delegate;
  
      private final LocalRepository repo;
  
      private final boolean realLocalRepo;
  
      public static RepositorySystemSession overlay(
              ArtifactRepository repository, RepositorySystemSession session, RepositorySystem system) {
          if (repository == null || repository.getBasedir() == null) {
              return session;
          }
  
          if (session != null) {
              LocalRepositoryManager lrm = session.getLocalRepositoryManager();
              if (lrm != null && lrm.getRepository().getBasedir().equals(new File(repository.getBasedir()))) {
                  return session;
              }
          } else {
              session = new DefaultRepositorySystemSession();
          }
  
          final LocalRepositoryManager llrm = new LegacyLocalRepositoryManager(repository);
  
          return new DefaultRepositorySystemSession(session).setLocalRepositoryManager(llrm);
      }
  
      private LegacyLocalRepositoryManager(ArtifactRepository delegate) {
          this.delegate = Objects.requireNonNull(delegate, "delegate cannot be null");
  
          ArtifactRepositoryLayout layout = delegate.getLayout();
          repo = new LocalRepository(
                  new File(delegate.getBasedir()),
                  (layout != null) ? layout.getClass().getSimpleName() : "legacy");
  
          /*
           * NOTE: "invoker:install" vs "appassembler:assemble": Both mojos use the artifact installer to put an artifact
           * into a repository. In the first case, the result needs to be a proper local repository that one can use for
           * local artifact resolution. In the second case, the result needs to precisely obey the path information of the
           * repository's layout to allow pointing at artifacts within the repository. Unfortunately,
           * DefaultRepositoryLayout does not correctly describe the layout of a local repository which unlike a remote
           * repository never uses timestamps in the filename of a snapshot artifact. The discrepancy gets notable when a
           * remotely resolved snapshot artifact gets passed into pathOf(). So producing a proper local artifact path
           * using DefaultRepositoryLayout requires us to enforce usage of the artifact's base version. This
           * transformation however contradicts the other use case of precisely obeying the repository's layout. The below
           * flag tries to detect which use case applies to make both plugins happy.
           */
         realLocalRepo = (layout instanceof DefaultRepositoryLayout) && "local".equals(delegate.getId());
     }
 
     public LocalRepository getRepository() {
         return repo;
     }
 
     public String getPathForLocalArtifact(Artifact artifact) {
         if (realLocalRepo) {
             return delegate.pathOf(RepositoryUtils.toArtifact(artifact.setVersion(artifact.getBaseVersion())));
         }
         return delegate.pathOf(RepositoryUtils.toArtifact(artifact));
     }
 
     public String getPathForRemoteArtifact(Artifact artifact, RemoteRepository repository, String context) {
         return delegate.pathOf(RepositoryUtils.toArtifact(artifact));
     }
 
     public String getPathForLocalMetadata(Metadata metadata) {
         return delegate.pathOfLocalRepositoryMetadata(new ArtifactMetadataAdapter(metadata), delegate);
     }
 
     public String getPathForRemoteMetadata(Metadata metadata, RemoteRepository repository, String context) {
         return delegate.pathOfLocalRepositoryMetadata(
                 new ArtifactMetadataAdapter(metadata), new ArtifactRepositoryAdapter(repository));
     }
 
     public LocalArtifactResult find(RepositorySystemSession session, LocalArtifactRequest request) {
         String path = getPathForLocalArtifact(request.getArtifact());
         File file = new File(getRepository().getBasedir(), path);
 
         LocalArtifactResult result = new LocalArtifactResult(request);
         if (file.isFile()) {
             result.setFile(file);
             result.setAvailable(true);
         }
 
         return result;
     }
 
     public LocalMetadataResult find(RepositorySystemSession session, LocalMetadataRequest request) {
         Metadata metadata = request.getMetadata();
 
         String path;
         if (request.getRepository() == null) {
             path = getPathForLocalMetadata(metadata);
         } else {
             path = getPathForRemoteMetadata(metadata, request.getRepository(), request.getContext());
         }
 
         File file = new File(getRepository().getBasedir(), path);
 
         LocalMetadataResult result = new LocalMetadataResult(request);
         if (file.isFile()) {
             result.setFile(file);
         }
 
         return result;
     }
 
     public void add(RepositorySystemSession session, LocalArtifactRegistration request) {
         // noop
     }
 
     public void add(RepositorySystemSession session, LocalMetadataRegistration request) {
         // noop
     }
 
     static class ArtifactMetadataAdapter implements ArtifactMetadata {
 
         private final Metadata metadata;
 
         ArtifactMetadataAdapter(Metadata metadata) {
             this.metadata = metadata;
         }
 
         public boolean storedInArtifactVersionDirectory() {
             return metadata.getVersion().length() > 0;
         }
 
         public boolean storedInGroupDirectory() {
             return metadata.getArtifactId().length() <= 0;
         }
 
         public String getGroupId() {
             return nullify(metadata.getGroupId());
         }
 
         public String getArtifactId() {
             return nullify(metadata.getArtifactId());
         }
 
         public String getBaseVersion() {
             return nullify(metadata.getVersion());
         }
 
         private String nullify(String str) {
             return (str == null || str.length() <= 0) ? null : str;
         }
 
         public Object getKey() {
             return metadata.toString();
         }
 
         public String getRemoteFilename() {
             return metadata.getType();
         }
 
         public String getLocalFilename(ArtifactRepository repository) {
             return insertRepositoryKey(getRemoteFilename(), repository.getKey());
         }
 
         private String insertRepositoryKey(String filename, String repositoryKey) {
             String result;
             int idx = filename.indexOf('.');
             if (idx < 0) {
                 result = filename + '-' + repositoryKey;
             } else {
                 result = filename.substring(0, idx) + '-' + repositoryKey + filename.substring(idx);
             }
             return result;
         }
 
         public void merge(org.apache.maven.repository.legacy.metadata.ArtifactMetadata metadata) {
             // not used
         }
 
         public void merge(ArtifactMetadata metadata) {
             // not used
         }
 
         public void storeInLocalRepository(ArtifactRepository localRepository, ArtifactRepository remoteRepository)
                 throws RepositoryMetadataStoreException {
             // not used
         }
 
         public String extendedToString() {
             return metadata.toString();
         }
     }
 
     static class ArtifactRepositoryAdapter implements ArtifactRepository {
 
         private final RemoteRepository repository;
 
         ArtifactRepositoryAdapter(RemoteRepository repository) {
             this.repository = repository;
         }
 
         public String pathOf(org.apache.maven.artifact.Artifact artifact) {
             return null;
         }
 
         public String pathOfRemoteRepositoryMetadata(ArtifactMetadata artifactMetadata) {
             return null;
         }
 
         public String pathOfLocalRepositoryMetadata(ArtifactMetadata metadata, ArtifactRepository repository) {
             return null;
         }
 
         public String getUrl() {
             return repository.getUrl();
         }
 
         public void setUrl(String url) {}
 
         public String getBasedir() {
             return null;
         }
 
         public String getProtocol() {
             return repository.getProtocol();
         }
 
         public String getId() {
             return repository.getId();
         }
 
         public void setId(String id) {}
 
         public ArtifactRepositoryPolicy getSnapshots() {
             return null;
         }
 
         public void setSnapshotUpdatePolicy(ArtifactRepositoryPolicy policy) {}
 
         public ArtifactRepositoryPolicy getReleases() {
             return null;
         }
 
         public void setReleaseUpdatePolicy(ArtifactRepositoryPolicy policy) {}
 
         public ArtifactRepositoryLayout getLayout() {
             return null;
         }
 
         public void setLayout(ArtifactRepositoryLayout layout) {}
 
         public String getKey() {
             return getId();
         }
 
         public boolean isUniqueVersion() {
             return true;
         }
 
         public boolean isBlacklisted() {
             return false;
         }
 
         public void setBlacklisted(boolean blackListed) {}
 
         public org.apache.maven.artifact.Artifact find(org.apache.maven.artifact.Artifact artifact) {
             return null;
         }
 
         public List<String> findVersions(org.apache.maven.artifact.Artifact artifact) {
             return Collections.emptyList();
         }
 
         public boolean isProjectAware() {
             return false;
         }
 
         public void setAuthentication(Authentication authentication) {}
 
         public Authentication getAuthentication() {
             return null;
         }
 
         public void setProxy(Proxy proxy) {}
 
         public Proxy getProxy() {
             return null;
         }
 
         public List<ArtifactRepository> getMirroredRepositories() {
             return Collections.emptyList();
         }
 
         public void setMirroredRepositories(List<ArtifactRepository> mirroredRepositories) {}
 
         public boolean isBlocked() {
             return false;
         }
 
         public void setBlocked(boolean blocked) {}
     }
 }