/*
    * 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.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Optional;
  import java.util.function.Consumer;
  import java.util.function.Function;
  
  import org.apache.maven.api.cli.Options;
  import org.apache.maven.api.cli.ParserRequest;
  
  /**
   * Options that are "layered" by precedence order.
   *
   * @param <O> The type of options.
   */
  public abstract class LayeredOptions<O extends Options> implements Options {
      protected final List<O> options;
  
      protected LayeredOptions(List<O> options) {
          this.options = new ArrayList<>(options);
      }
  
      @Override
      public Optional<Map<String, String>> userProperties() {
          return collectMapIfPresentOrEmpty(Options::userProperties);
      }
  
      @Override
      public String source() {
          return String.format(
                  "layered(%s)", options.stream().map(Options::source).toList());
      }
  
      @Override
      public Optional<Boolean> showVersionAndExit() {
          return returnFirstPresentOrEmpty(Options::showVersionAndExit);
      }
  
      @Override
      public Optional<Boolean> showVersion() {
          return returnFirstPresentOrEmpty(Options::showVersion);
      }
  
      @Override
      public Optional<Boolean> quiet() {
          return returnFirstPresentOrEmpty(Options::quiet);
      }
  
      @Override
      public Optional<Boolean> verbose() {
          return returnFirstPresentOrEmpty(Options::verbose);
      }
  
      @Override
      public Optional<Boolean> showErrors() {
          return returnFirstPresentOrEmpty(Options::showErrors);
      }
  
      @Override
      public Optional<String> failOnSeverity() {
          return returnFirstPresentOrEmpty(Options::failOnSeverity);
      }
  
      @Override
      public Optional<Boolean> nonInteractive() {
          return returnFirstPresentOrEmpty(Options::nonInteractive);
      }
  
      @Override
      public Optional<Boolean> forceInteractive() {
          return returnFirstPresentOrEmpty(Options::forceInteractive);
      }
  
      @Override
      public Optional<String> altUserSettings() {
          return returnFirstPresentOrEmpty(Options::altUserSettings);
      }
  
     @Override
     public Optional<String> altProjectSettings() {
         return returnFirstPresentOrEmpty(Options::altProjectSettings);
     }
 
     @Override
     public Optional<String> altInstallationSettings() {
         return returnFirstPresentOrEmpty(Options::altInstallationSettings);
     }
 
     @Override
     public Optional<String> altUserToolchains() {
         return returnFirstPresentOrEmpty(Options::altUserToolchains);
     }
 
     @Override
     public Optional<String> altInstallationToolchains() {
         return returnFirstPresentOrEmpty(Options::altInstallationToolchains);
     }
 
     @Override
     public Optional<String> logFile() {
         return returnFirstPresentOrEmpty(Options::logFile);
     }
 
     @Override
     public Optional<Boolean> rawStreams() {
         return returnFirstPresentOrEmpty(Options::rawStreams);
     }
 
     @Override
     public Optional<String> color() {
         return returnFirstPresentOrEmpty(Options::color);
     }
 
     @Override
     public Optional<Boolean> offline() {
         return returnFirstPresentOrEmpty(Options::offline);
     }
 
     @Override
     public Optional<Boolean> help() {
         return returnFirstPresentOrEmpty(Options::help);
     }
 
     @Override
     public void warnAboutDeprecatedOptions(ParserRequest request, Consumer<String> printWriter) {}
 
     @Override
     public void displayHelp(ParserRequest request, Consumer<String> printWriter) {
         options.get(0).displayHelp(request, printWriter);
     }
 
     protected <T> Optional<T> returnFirstPresentOrEmpty(Function<O, Optional<T>> getter) {
         for (O option : options) {
             Optional<T> o = getter.apply(option);
             if (o.isPresent()) {
                 return o;
             }
         }
         return Optional.empty();
     }
 
     protected Optional<List<String>> collectListIfPresentOrEmpty(Function<O, Optional<List<String>>> getter) {
         int had = 0;
         ArrayList<String> items = new ArrayList<>();
         for (O option : options) {
             Optional<List<String>> o = getter.apply(option);
             if (o.isPresent()) {
                 had++;
                 items.addAll(o.get());
             }
         }
         return had == 0 ? Optional.empty() : Optional.of(List.copyOf(items));
     }
 
     protected Optional<Map<String, String>> collectMapIfPresentOrEmpty(
             Function<O, Optional<Map<String, String>>> getter) {
         int had = 0;
         HashMap<String, String> items = new HashMap<>();
         for (O option : options) {
             Optional<Map<String, String>> up = getter.apply(option);
             if (up.isPresent()) {
                 had++;
                 for (Map.Entry<String, String> entry : up.get().entrySet()) {
                     items.putIfAbsent(entry.getKey(), entry.getValue());
                 }
             }
         }
         return had == 0 ? Optional.empty() : Optional.of(Map.copyOf(items));
     }
 }