/*
    * 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.shared.dependency.graph.internal;
  
  import java.util.Arrays;
  import java.util.Comparator;
  import java.util.List;
  
  import org.eclipse.aether.RepositoryException;
  import org.eclipse.aether.util.graph.transformer.ConflictResolver.ConflictContext;
  import org.eclipse.aether.util.graph.transformer.ConflictResolver.ScopeSelector;
  import org.eclipse.aether.util.graph.transformer.JavaScopeSelector;
  
  /**
   * A JavaScopeSelector that keeps track of reduced scopes.
   */
  public class VerboseJavaScopeSelector extends ScopeSelector {
      public static final String REDUCED_SCOPE = "REDUCED_SCOPE";
  
      private final ScopeSelector scopeSelector = new JavaScopeSelector();
  
      @Override
      public void selectScope(ConflictContext context) throws RepositoryException {
          scopeSelector.selectScope(context);
  
          context.getItems().stream()
                  .flatMap(i -> i.getScopes().stream())
                  .distinct()
                  .max(new ScopeComparator())
                  .filter(s -> s != context.getScope())
                  .ifPresent(s -> context.getWinner().getNode().setData(REDUCED_SCOPE, s));
      }
  
      static class ScopeComparator implements Comparator<String> {
          List<String> orderedScopes = Arrays.asList("compile", "runtime", "provided", "test");
  
          @Override
          public int compare(String lhs, String rhs) {
              return orderedScopes.indexOf(rhs) - orderedScopes.indexOf(lhs);
          }
      }
  }