/*
    * 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.cling.invoker;
  
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Optional;
  
  import org.apache.maven.api.services.Lookup;
  import org.apache.maven.api.services.LookupException;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * Proto-{@link Lookup} offer ways to provide early components to invoker.
   */
  public class ProtoLookup implements Lookup {
      private final Map<Class<?>, Object> components;
  
      private ProtoLookup(Map<Class<?>, Object> components) {
          this.components = components;
      }
  
      @Override
      public <T> T lookup(Class<T> type) {
          Optional<T> optional = lookupOptional(type);
          if (optional.isPresent()) {
              return optional.get();
          } else {
              throw new LookupException("No mapping for key: " + type.getName());
          }
      }
  
      @Override
      public <T> T lookup(Class<T> type, String name) {
          return lookup(type);
      }
  
      @Override
      public <T> Optional<T> lookupOptional(Class<T> type) {
          return Optional.ofNullable(type.cast(components.get(type)));
      }
  
      @Override
      public <T> Optional<T> lookupOptional(Class<T> type, String name) {
          return lookupOptional(type);
      }
  
      @Override
      public <T> List<T> lookupList(Class<T> type) {
          return List.of();
      }
  
      @Override
      public <T> Map<String, T> lookupMap(Class<T> type) {
          return Map.of();
      }
  
      public static Builder builder() {
          return new Builder();
      }
  
      public static class Builder {
          private final Map<Class<?>, Object> components = new HashMap<>();
  
          public ProtoLookup build() {
              return new ProtoLookup(components);
          }
  
          public <T> Builder addMapping(Class<T> type, T component) {
              requireNonNull(type, "type");
              requireNonNull(component, "component");
              if (components.put(type, component) != null) {
                  throw new IllegalStateException("Duplicate mapping for type: " + type.getName());
              }
              return this;
          }
      }
  }