/*
    * 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.lifecycle.mapping;
  
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import static java.util.function.Function.identity;
  import static java.util.stream.Collectors.toMap;
  
  /**
   * DefaultLifecycleMapping
   */
  public class DefaultLifecycleMapping implements LifecycleMapping {
  
      private List<Lifecycle> lifecycles;
  
      private Map<String, Lifecycle> lifecycleMap;
  
      /** @deprecated use lifecycles instead */
      private Map<String, LifecyclePhase> phases;
  
      /**
       * Default ctor for plexus compatibility: lifecycles are most commonly defined in Plexus XML, that does field
       * injection. Still, for Plexus to be able to instantiate this class, default ctor is needed.
       *
       * @deprecated Should not be used in Java code.
       */
      @Deprecated
      public DefaultLifecycleMapping() {}
  
      /**
       * Ctor to be used in Java code/providers.
       */
      public DefaultLifecycleMapping(final List<Lifecycle> lifecycles) {
          this.lifecycleMap =
                  Collections.unmodifiableMap(lifecycles.stream().collect(toMap(Lifecycle::getId, identity())));
      }
  
      /**
       * Plexus: Populates the lifecycle map from the injected list of lifecycle mappings (if not already done).
       */
      private void initLifecycleMap() {
          if (lifecycleMap == null) {
              lifecycleMap = new HashMap<>();
  
              if (lifecycles != null) {
                  for (Lifecycle lifecycle : lifecycles) {
                      lifecycleMap.put(lifecycle.getId(), lifecycle);
                  }
              } else {
                  /*
                   * NOTE: This is to provide a migration path for implementors of the legacy API which did not know about
                   * getLifecycles().
                   */
  
                  String[] lifecycleIds = {"default", "clean", "site"};
  
                  for (String lifecycleId : lifecycleIds) {
                      Map<String, LifecyclePhase> phases = getLifecyclePhases(lifecycleId);
                      if (phases != null) {
                          Lifecycle lifecycle = new Lifecycle();
  
                          lifecycle.setId(lifecycleId);
                          lifecycle.setLifecyclePhases(phases);
  
                          lifecycleMap.put(lifecycleId, lifecycle);
                      }
                  }
              }
          }
      }
  
      @Override
      public Map<String, Lifecycle> getLifecycles() {
          initLifecycleMap();
  
          return lifecycleMap;
      }
  
      @Deprecated
     @Override
     public List<String> getOptionalMojos(String lifecycle) {
         return null;
     }
 
     private Map<String, LifecyclePhase> getLifecyclePhases(String lifecycle) {
         initLifecycleMap();
 
         Lifecycle lifecycleMapping = lifecycleMap.get(lifecycle);
 
         if (lifecycleMapping != null) {
             return lifecycleMapping.getLifecyclePhases();
         } else if ("default".equals(lifecycle)) {
             return phases;
         } else {
             return null;
         }
     }
 
     @Deprecated
     @Override
     public Map<String, String> getPhases(String lifecycle) {
         return LifecyclePhase.toLegacyMap(getLifecyclePhases(lifecycle));
     }
 }