/*
    * 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.model.management;
  
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import org.apache.maven.model.Dependency;
  import org.apache.maven.model.DependencyManagement;
  import org.apache.maven.model.Exclusion;
  import org.apache.maven.model.Model;
  import org.apache.maven.model.building.ModelBuildingRequest;
  import org.apache.maven.model.building.ModelProblemCollector;
  import org.apache.maven.model.merge.MavenModelMerger;
  
  /**
   * Handles injection of dependency management into the model.
   *
   * @author Benjamin Bentmann
   */
  @SuppressWarnings({"checkstyle:methodname"})
  @Named
  @Singleton
  public class DefaultDependencyManagementInjector implements DependencyManagementInjector {
  
      private ManagementModelMerger merger = new ManagementModelMerger();
  
      @Override
      public void injectManagement(Model model, ModelBuildingRequest request, ModelProblemCollector problems) {
          merger.mergeManagedDependencies(model);
      }
  
      /**
       * ManagementModelMerger
       */
      protected static class ManagementModelMerger extends MavenModelMerger {
  
          public void mergeManagedDependencies(Model model) {
              DependencyManagement dependencyManagement = model.getDependencyManagement();
              if (dependencyManagement != null) {
                  Map<Object, Dependency> dependencies = new HashMap<>();
                  Map<Object, Object> context = Collections.emptyMap();
  
                  for (Dependency dependency : model.getDependencies()) {
                      Object key = getDependencyKey(dependency);
                      dependencies.put(key, dependency);
                  }
  
                  for (Dependency managedDependency : dependencyManagement.getDependencies()) {
                      Object key = getDependencyKey(managedDependency);
                      Dependency dependency = dependencies.get(key);
                      if (dependency != null) {
                          mergeDependency(dependency, managedDependency, false, context);
                      }
                  }
              }
          }
  
          @Override
          protected void mergeDependency_Optional(
                  Dependency target, Dependency source, boolean sourceDominant, Map<Object, Object> context) {
              // optional flag is not managed
          }
  
          @Override
          protected void mergeDependency_Exclusions(
                  Dependency target, Dependency source, boolean sourceDominant, Map<Object, Object> context) {
              List<Exclusion> tgt = target.getExclusions();
              if (tgt.isEmpty()) {
                  List<Exclusion> src = source.getExclusions();
  
                  for (Exclusion element : src) {
                      Exclusion clone = element.clone();
                      target.addExclusion(clone);
                  }
              }
          }
      }
 }