/*
    * 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.composition;
  
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import java.util.LinkedHashMap;
  import java.util.List;
  import java.util.Map;
  
  import org.apache.maven.api.model.Dependency;
  import org.apache.maven.api.model.DependencyManagement;
  import org.apache.maven.api.model.Model;
  import org.apache.maven.model.building.ModelBuildingRequest;
  import org.apache.maven.model.building.ModelProblemCollector;
  
  /**
   * Handles the import of dependency management from other models into the target model.
   *
   * @author Benjamin Bentmann
   */
  @Named
  @Singleton
  public class DefaultDependencyManagementImporter implements DependencyManagementImporter {
  
      @Override
      public Model importManagement(
              Model target,
              List<? extends DependencyManagement> sources,
              ModelBuildingRequest request,
              ModelProblemCollector problems) {
          if (sources != null && !sources.isEmpty()) {
              Map<String, Dependency> dependencies = new LinkedHashMap<>();
  
              DependencyManagement depMgmt = target.getDependencyManagement();
  
              if (depMgmt != null) {
                  for (Dependency dependency : depMgmt.getDependencies()) {
                      dependencies.put(dependency.getManagementKey(), dependency);
                  }
              } else {
                  depMgmt = DependencyManagement.newInstance();
              }
  
              for (DependencyManagement source : sources) {
                  for (Dependency dependency : source.getDependencies()) {
                      String key = dependency.getManagementKey();
                      dependencies.putIfAbsent(key, dependency);
                  }
              }
  
              return target.withDependencyManagement(depMgmt.withDependencies(dependencies.values()));
          }
          return target;
      }
  }