/*
    * 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.plugin;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.LinkedHashMap;
  import java.util.List;
  import java.util.Map;
  
  import org.apache.maven.lifecycle.LifeCyclePluginAnalyzer;
  import org.apache.maven.model.Build;
  import org.apache.maven.model.Model;
  import org.apache.maven.model.Plugin;
  import org.apache.maven.model.PluginContainer;
  import org.apache.maven.model.PluginExecution;
  import org.apache.maven.model.PluginManagement;
  import org.apache.maven.model.building.ModelBuildingRequest;
  import org.apache.maven.model.building.ModelProblem.Severity;
  import org.apache.maven.model.building.ModelProblem.Version;
  import org.apache.maven.model.building.ModelProblemCollector;
  import org.apache.maven.model.building.ModelProblemCollectorRequest;
  import org.apache.maven.model.merge.MavenModelMerger;
  
  /**
   * Handles injection of plugin executions induced by the lifecycle bindings for a packaging.
   *
   * @author Benjamin Bentmann
   */
  @Singleton
  @Named
  public class DefaultLifecycleBindingsInjector implements LifecycleBindingsInjector {
  
      private LifecycleBindingsMerger merger = new LifecycleBindingsMerger();
  
      @Inject
      private LifeCyclePluginAnalyzer lifecycle;
  
      public void injectLifecycleBindings(Model model, ModelBuildingRequest request, ModelProblemCollector problems) {
          String packaging = model.getPackaging();
  
          Collection<Plugin> defaultPlugins = lifecycle.getPluginsBoundByDefaultToAllLifecycles(packaging);
  
          if (defaultPlugins == null) {
              problems.add(new ModelProblemCollectorRequest(Severity.ERROR, Version.BASE)
                      .setMessage("Unknown packaging: " + packaging)
                      .setLocation(model.getLocation("packaging")));
          } else if (!defaultPlugins.isEmpty()) {
              Model lifecycleModel = new Model();
              lifecycleModel.setBuild(new Build());
              lifecycleModel.getBuild().getPlugins().addAll(defaultPlugins);
  
              merger.merge(model, lifecycleModel);
          }
      }
  
      /**
       *  The domain-specific model merger for lifecycle bindings
       */
      protected static class LifecycleBindingsMerger extends MavenModelMerger {
  
          private static final String PLUGIN_MANAGEMENT = "plugin-management";
  
          public void merge(Model target, Model source) {
              if (target.getBuild() == null) {
                  target.setBuild(new Build());
              }
  
              Map<Object, Object> context = Collections.<Object, Object>singletonMap(
                      PLUGIN_MANAGEMENT, target.getBuild().getPluginManagement());
  
              mergePluginContainer_Plugins(target.getBuild(), source.getBuild(), false, context);
          }
  
          @SuppressWarnings({"checkstyle:methodname"})
          @Override
          protected void mergePluginContainer_Plugins(
                  PluginContainer target, PluginContainer source, boolean sourceDominant, Map<Object, Object> context) {
             List<Plugin> src = source.getPlugins();
             if (!src.isEmpty()) {
                 List<Plugin> tgt = target.getPlugins();
 
                 Map<Object, Plugin> merged = new LinkedHashMap<>((src.size() + tgt.size()) * 2);
 
                 for (Plugin element : tgt) {
                     Object key = getPluginKey(element);
                     merged.put(key, element);
                 }
 
                 Map<Object, Plugin> added = new LinkedHashMap<>();
 
                 for (Plugin element : src) {
                     Object key = getPluginKey(element);
                     Plugin existing = merged.get(key);
                     if (existing != null) {
                         mergePlugin(existing, element, sourceDominant, context);
                     } else {
                         merged.put(key, element);
                         added.put(key, element);
                     }
                 }
 
                 if (!added.isEmpty()) {
                     PluginManagement pluginMgmt = (PluginManagement) context.get(PLUGIN_MANAGEMENT);
                     if (pluginMgmt != null) {
                         for (Plugin managedPlugin : pluginMgmt.getPlugins()) {
                             Object key = getPluginKey(managedPlugin);
                             Plugin addedPlugin = added.get(key);
                             if (addedPlugin != null) {
                                 Plugin plugin = managedPlugin.clone();
                                 mergePlugin(plugin, addedPlugin, sourceDominant, Collections.emptyMap());
                                 merged.put(key, plugin);
                             }
                         }
                     }
                 }
 
                 List<Plugin> result = new ArrayList<>(merged.values());
 
                 target.setPlugins(result);
             }
         }
 
         @Override
         protected void mergePluginExecution(
                 PluginExecution target, PluginExecution source, boolean sourceDominant, Map<Object, Object> context) {
             super.mergePluginExecution(target, source, sourceDominant, context);
 
             target.setPriority(Math.min(target.getPriority(), source.getPriority()));
         }
     }
 }