/*
    * 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.normalization;
  
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.LinkedHashMap;
  import java.util.List;
  import java.util.Map;
  
  import org.apache.maven.model.Build;
  import org.apache.maven.model.Dependency;
  import org.apache.maven.model.Model;
  import org.apache.maven.model.Plugin;
  import org.apache.maven.model.building.ModelBuildingRequest;
  import org.apache.maven.model.building.ModelProblemCollector;
  import org.apache.maven.model.merge.MavenModelMerger;
  import org.codehaus.plexus.util.StringUtils;
  
  /**
   * Handles normalization of a model.
   *
   * @author Benjamin Bentmann
   */
  @Named
  @Singleton
  public class DefaultModelNormalizer implements ModelNormalizer {
  
      private DuplicateMerger merger = new DuplicateMerger();
  
      @Override
      public void mergeDuplicates(Model model, ModelBuildingRequest request, ModelProblemCollector problems) {
          Build build = model.getBuild();
          if (build != null) {
              List<Plugin> plugins = build.getPlugins();
              Map<Object, Plugin> normalized = new LinkedHashMap<>(plugins.size() * 2);
  
              for (Plugin plugin : plugins) {
                  Object key = plugin.getKey();
                  Plugin first = normalized.get(key);
                  if (first != null) {
                      merger.mergePlugin(plugin, first);
                  }
                  normalized.put(key, plugin);
              }
  
              if (plugins.size() != normalized.size()) {
                  build.setPlugins(new ArrayList<>(normalized.values()));
              }
          }
  
          /*
           * NOTE: This is primarily to keep backward-compat with Maven 2.x which did not validate that dependencies are
           * unique within a single POM. Upon multiple declarations, 2.x just kept the last one but retained the order of
           * the first occurrence. So when we're in lenient/compat mode, we have to deal with such broken POMs and mimic
           * the way 2.x works. When we're in strict mode, the removal of duplicates just saves other merging steps from
           * aftereffects and bogus error messages.
           */
          List<Dependency> dependencies = model.getDependencies();
          Map<String, Dependency> normalized = new LinkedHashMap<>(dependencies.size() * 2);
  
          for (Dependency dependency : dependencies) {
              normalized.put(dependency.getManagementKey(), dependency);
          }
  
          if (dependencies.size() != normalized.size()) {
              model.setDependencies(new ArrayList<>(normalized.values()));
          }
      }
  
      /**
       * DuplicateMerger
       */
      protected static class DuplicateMerger extends MavenModelMerger {
  
          public void mergePlugin(Plugin target, Plugin source) {
              super.mergePlugin(target, source, false, Collections.emptyMap());
          }
      }
  
     @Override
     public void injectDefaultValues(Model model, ModelBuildingRequest request, ModelProblemCollector problems) {
         injectDependencyDefaults(model.getDependencies());
 
         Build build = model.getBuild();
         if (build != null) {
             for (Plugin plugin : build.getPlugins()) {
                 injectDependencyDefaults(plugin.getDependencies());
             }
         }
     }
 
     private void injectDependencyDefaults(List<Dependency> dependencies) {
         for (Dependency dependency : dependencies) {
             if (StringUtils.isEmpty(dependency.getScope())) {
                 // we cannot set this directly in the MDO due to the interactions with dependency management
                 dependency.setScope("compile");
             }
         }
     }
 }