/*
    * 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 javax.inject.Inject;
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import java.util.List;
  import java.util.Map;
  import java.util.Optional;
  import java.util.concurrent.ConcurrentHashMap;
  import java.util.stream.Collectors;
  
  import org.apache.maven.api.JavaPathType;
  import org.apache.maven.api.Type;
  import org.apache.maven.api.annotations.Nonnull;
  import org.apache.maven.api.services.LanguageRegistry;
  import org.apache.maven.api.services.TypeRegistry;
  import org.apache.maven.api.spi.TypeProvider;
  import org.apache.maven.artifact.handler.ArtifactHandler;
  import org.apache.maven.artifact.handler.manager.LegacyArtifactHandlerManager;
  import org.apache.maven.eventspy.AbstractEventSpy;
  import org.apache.maven.execution.ExecutionEvent;
  import org.apache.maven.internal.impl.resolver.type.DefaultType;
  
  import static java.util.function.Function.identity;
  import static org.apache.maven.internal.impl.Utils.nonNull;
  
  @Named
  @Singleton
  public class DefaultTypeRegistry extends AbstractEventSpy implements TypeRegistry {
      private final Map<String, Type> types;
  
      private final LanguageRegistry languageRegistry;
  
      private final ConcurrentHashMap<String, Type> usedTypes;
  
      private final LegacyArtifactHandlerManager manager;
  
      @Inject
      public DefaultTypeRegistry(
              List<TypeProvider> providers, LanguageRegistry languageRegistry, LegacyArtifactHandlerManager manager) {
          this.types = nonNull(providers, "providers").stream()
                  .flatMap(p -> p.provides().stream())
                  .collect(Collectors.toMap(Type::id, identity()));
          this.languageRegistry = nonNull(languageRegistry, "languageRegistry");
          this.usedTypes = new ConcurrentHashMap<>();
          this.manager = nonNull(manager, "artifactHandlerManager");
      }
  
      @Override
      public void onEvent(Object event) {
          if (event instanceof ExecutionEvent) {
              ExecutionEvent executionEvent = (ExecutionEvent) event;
              if (executionEvent.getType() == ExecutionEvent.Type.SessionEnded) {
                  usedTypes.clear();
              }
          }
      }
  
      @Override
      public Optional<Type> lookup(String id) {
          return Optional.of(require(id));
      }
  
      @Override
      @Nonnull
      public Type require(String id) {
          nonNull(id, "id");
          return usedTypes.computeIfAbsent(id, i -> {
              Type type = types.get(id);
              if (type == null) {
                  // Copy data as the ArtifactHandler is not immutable, but Type should be.
                  ArtifactHandler handler = manager.getArtifactHandler(id);
                  type = new DefaultType(
                          id,
                          languageRegistry.require(handler.getLanguage()),
                          handler.getExtension(),
                          handler.getClassifier(),
                          handler.isIncludesDependencies(),
                          JavaPathType.CLASSES,
                          JavaPathType.MODULES);
             }
             return type;
         });
     }
 }