/*
    * 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.internal.impl;
  
  import java.util.List;
  import java.util.Locale;
  import java.util.Map;
  import java.util.Optional;
  import java.util.stream.Collectors;
  import java.util.stream.Stream;
  
  import org.apache.maven.api.ExtensibleEnum;
  import org.apache.maven.api.Language;
  import org.apache.maven.api.PathScope;
  import org.apache.maven.api.ProjectScope;
  import org.apache.maven.api.di.Inject;
  import org.apache.maven.api.di.Named;
  import org.apache.maven.api.di.SessionScoped;
  import org.apache.maven.api.di.Singleton;
  import org.apache.maven.api.services.ExtensibleEnumRegistry;
  import org.apache.maven.api.services.LanguageRegistry;
  import org.apache.maven.api.services.PathScopeRegistry;
  import org.apache.maven.api.services.ProjectScopeRegistry;
  import org.apache.maven.api.spi.ExtensibleEnumProvider;
  import org.apache.maven.api.spi.LanguageProvider;
  import org.apache.maven.api.spi.PathScopeProvider;
  import org.apache.maven.api.spi.ProjectScopeProvider;
  
  import static org.apache.maven.internal.impl.Utils.nonNull;
  
  public class ExtensibleEnumRegistries {
  
      @Named
      @SessionScoped
      public static class DefaultPathScopeRegistry extends DefaultExtensibleEnumRegistry<PathScope, PathScopeProvider>
              implements PathScopeRegistry {
  
          @Inject
          public DefaultPathScopeRegistry(List<PathScopeProvider> providers) {
              super(
                      providers,
                      PathScope.MAIN_COMPILE,
                      PathScope.MAIN_RUNTIME,
                      PathScope.TEST_COMPILE,
                      PathScope.TEST_RUNTIME);
          }
      }
  
      @Named
      @SessionScoped
      public static class DefaultProjectScopeRegistry
              extends DefaultExtensibleEnumRegistry<ProjectScope, ProjectScopeProvider> implements ProjectScopeRegistry {
  
          @Inject
          public DefaultProjectScopeRegistry(List<ProjectScopeProvider> providers) {
              super(providers, ProjectScope.MAIN, ProjectScope.TEST);
          }
      }
  
      @Named
      @Singleton
      public static class DefaultLanguageRegistry extends DefaultExtensibleEnumRegistry<Language, LanguageProvider>
              implements LanguageRegistry {
  
          @Inject
          public DefaultLanguageRegistry(List<LanguageProvider> providers) {
              super(providers, Language.NONE, Language.JAVA_FAMILY);
          }
      }
  
      public abstract static class DefaultExtensibleEnumRegistry<
                      T extends ExtensibleEnum, P extends ExtensibleEnumProvider<T>>
              implements ExtensibleEnumRegistry<T> {
  
          protected final Map<String, T> values;
  
          DefaultExtensibleEnumRegistry(List<P> providers, T... builtinValues) {
              values = Stream.<T>concat(
                              Stream.of(builtinValues), providers.stream().flatMap(p -> p.provides().stream()))
                      .collect(Collectors.toUnmodifiableMap(t -> t.id().toLowerCase(Locale.ROOT), t -> t));
          }
  
          @Override
         public Optional<T> lookup(String id) {
             return Optional.ofNullable(values.get(nonNull(id, "id").toLowerCase(Locale.ROOT)));
         }
     }
 }