/*
    * 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.tasks;
  
  import org.apache.tools.ant.Project;
  import org.apache.tools.ant.Task;
  import org.eclipse.aether.artifact.Artifact;
  import org.eclipse.aether.graph.Dependency;
  import org.eclipse.aether.graph.DependencyNode;
  import org.eclipse.aether.graph.DependencyVisitor;
  import org.eclipse.aether.util.graph.manager.DependencyManagerUtils;
  
  /**
   */
  class DependencyGraphLogger implements DependencyVisitor {
  
      private final Task task;
  
      private String indent = "";
  
      DependencyGraphLogger(Task task) {
          this.task = task;
      }
  
      @Override
      public boolean visitEnter(DependencyNode node) {
          StringBuilder buffer = new StringBuilder(128);
          buffer.append(indent);
          Dependency dep = node.getDependency();
          if (dep != null) {
              Artifact art = dep.getArtifact();
  
              buffer.append(art);
              buffer.append(':').append(dep.getScope());
  
              String premanagedScope = DependencyManagerUtils.getPremanagedScope(node);
              if (premanagedScope != null && !premanagedScope.equals(dep.getScope())) {
                  buffer.append(" (scope managed from ").append(premanagedScope).append(")");
              }
  
              String premanagedVersion = DependencyManagerUtils.getPremanagedVersion(node);
              if (premanagedVersion != null && !premanagedVersion.equals(art.getVersion())) {
                  buffer.append(" (version managed from ")
                          .append(premanagedVersion)
                          .append(")");
              }
          } else {
              buffer.append("Resolved Dependency Graph:");
          }
  
          task.log(buffer.toString(), Project.MSG_VERBOSE);
          indent += "   ";
          return true;
      }
  
      @Override
      public boolean visitLeave(DependencyNode node) {
          indent = indent.substring(0, indent.length() - 3);
          return true;
      }
  }