/*
    * 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.artifact.handler.manager;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import java.util.Map;
  import java.util.Set;
  import java.util.concurrent.ConcurrentHashMap;
  
  import org.apache.maven.api.JavaPathType;
  import org.apache.maven.api.Type;
  import org.apache.maven.api.services.TypeRegistry;
  import org.apache.maven.artifact.handler.ArtifactHandler;
  import org.apache.maven.artifact.handler.DefaultArtifactHandler;
  import org.apache.maven.eventspy.AbstractEventSpy;
  import org.apache.maven.execution.ExecutionEvent;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   */
  @Named
  @Singleton
  public class DefaultArtifactHandlerManager extends AbstractEventSpy implements ArtifactHandlerManager {
      private final TypeRegistry typeRegistry;
  
      private final ConcurrentHashMap<String, ArtifactHandler> allHandlers;
  
      @Inject
      public DefaultArtifactHandlerManager(TypeRegistry typeRegistry) {
          this.typeRegistry = requireNonNull(typeRegistry, "null typeRegistry");
          this.allHandlers = new ConcurrentHashMap<>();
      }
  
      @Override
      public void onEvent(Object event) {
          if (event instanceof ExecutionEvent) {
              ExecutionEvent executionEvent = (ExecutionEvent) event;
              if (executionEvent.getType() == ExecutionEvent.Type.SessionEnded) {
                  allHandlers.clear();
              }
          }
      }
  
      @Override
      public ArtifactHandler getArtifactHandler(String id) {
          return allHandlers.computeIfAbsent(id, k -> {
              Type type = typeRegistry.require(id);
              return new DefaultArtifactHandler(
                      id,
                      type.getExtension(),
                      type.getClassifier(),
                      null,
                      null,
                      type.isIncludesDependencies(),
                      type.getLanguage().id(),
                      type.getPathTypes().contains(JavaPathType.CLASSES));
              // TODO: watch out for module path
          });
  
          // Note: here, type decides is artifact added to "build path" (for example during resolution)
          // and "build path" is intermediate data that is used to create actual Java classpath/modulepath
          // but to create those, proper filtering should happen via Type properties.
      }
  
      @Override
      public void addHandlers(Map<String, ArtifactHandler> handlers) {
          throw new UnsupportedOperationException("Adding handlers programmatically is not supported anymore");
      }
  
      @Deprecated
      public Set<String> getHandlerTypes() {
          throw new UnsupportedOperationException("Querying handlers programmatically is not supported anymore");
      }
  }