/*
    * 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.examples.resolver;
  
  import java.io.ByteArrayOutputStream;
  import java.io.PrintStream;
  import java.io.UnsupportedEncodingException;
  import java.nio.charset.StandardCharsets;
  
  import org.apache.maven.resolver.examples.util.Booter;
  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.artifact.DefaultArtifact;
  import org.eclipse.aether.collection.CollectRequest;
  import org.eclipse.aether.deployment.DeployRequest;
  import org.eclipse.aether.deployment.DeploymentException;
  import org.eclipse.aether.graph.Dependency;
  import org.eclipse.aether.graph.DependencyNode;
  import org.eclipse.aether.installation.InstallRequest;
  import org.eclipse.aether.installation.InstallationException;
  import org.eclipse.aether.repository.Authentication;
  import org.eclipse.aether.repository.LocalRepository;
  import org.eclipse.aether.repository.RemoteRepository;
  import org.eclipse.aether.resolution.DependencyRequest;
  import org.eclipse.aether.resolution.DependencyResolutionException;
  import org.eclipse.aether.util.graph.visitor.DependencyGraphDumper;
  import org.eclipse.aether.util.graph.visitor.NodeListGenerator;
  import org.eclipse.aether.util.graph.visitor.PreorderDependencyNodeConsumerVisitor;
  import org.eclipse.aether.util.repository.AuthenticationBuilder;
  
  /**
   */
  public class Resolver {
      private final String remoteRepository;
  
      private final RepositorySystem repositorySystem;
  
      private final LocalRepository localRepository;
  
      public Resolver(String factory, String remoteRepository, String localRepository) {
          this.remoteRepository = remoteRepository;
          this.repositorySystem = Booter.newRepositorySystem(factory);
          this.localRepository = new LocalRepository(localRepository);
      }
  
      private RepositorySystemSession newSession() {
          DefaultRepositorySystemSession session = Booter.newRepositorySystemSession(repositorySystem);
          session.setLocalRepositoryManager(repositorySystem.newLocalRepositoryManager(session, localRepository));
          session.setTransferListener(null);
          session.setRepositoryListener(null);
          return session;
      }
  
      public ResolverResult resolve(String groupId, String artifactId, String version)
              throws DependencyResolutionException {
          RepositorySystemSession session = newSession();
          Dependency dependency = new Dependency(new DefaultArtifact(groupId, artifactId, "", "jar", version), "runtime");
          RemoteRepository central = new RemoteRepository.Builder("central", "default", remoteRepository).build();
  
          CollectRequest collectRequest = new CollectRequest();
          collectRequest.setRoot(dependency);
          collectRequest.addRepository(central);
  
          DependencyRequest dependencyRequest = new DependencyRequest();
          dependencyRequest.setCollectRequest(collectRequest);
  
          DependencyNode rootNode =
                  repositorySystem.resolveDependencies(session, dependencyRequest).getRoot();
  
          StringBuilder dump = new StringBuilder();
          displayTree(rootNode, dump);
          System.out.println("Tree:");
          System.out.println(dump);
  
          NodeListGenerator nlg = new NodeListGenerator();
          rootNode.accept(new PreorderDependencyNodeConsumerVisitor(nlg));
  
          return new ResolverResult(rootNode, nlg.getFiles(), nlg.getClassPath());
      }
  
      public void install(Artifact artifact, Artifact pom) throws InstallationException {
         RepositorySystemSession session = newSession();
 
         InstallRequest installRequest = new InstallRequest();
         installRequest.addArtifact(artifact).addArtifact(pom);
 
         repositorySystem.install(session, installRequest);
     }
 
     public void deploy(Artifact artifact, Artifact pom, String remoteRepository) throws DeploymentException {
         RepositorySystemSession session = newSession();
 
         Authentication auth = new AuthenticationBuilder()
                 .addUsername("admin")
                 .addPassword("admin123")
                 .build();
         RemoteRepository nexus = new RemoteRepository.Builder("nexus", "default", remoteRepository)
                 .setAuthentication(auth)
                 .build();
 
         DeployRequest deployRequest = new DeployRequest();
         deployRequest.addArtifact(artifact).addArtifact(pom);
         deployRequest.setRepository(nexus);
 
         repositorySystem.deploy(session, deployRequest);
     }
 
     private void displayTree(DependencyNode node, StringBuilder sb) {
         try {
             ByteArrayOutputStream os = new ByteArrayOutputStream(1024);
             PrintStream ps = new PrintStream(os, true, StandardCharsets.UTF_8.name());
             node.accept(new DependencyGraphDumper(ps::println));
             sb.append(os);
         } catch (UnsupportedEncodingException e) {
             throw new RuntimeException(e);
         }
     }
 }