/*
    * 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.io.IOException;
  import java.io.InputStream;
  import java.util.List;
  import java.util.Map;
  import java.util.Properties;
  
  import org.apache.maven.api.annotations.Nonnull;
  import org.apache.maven.api.services.BuilderProblem;
  import org.apache.maven.api.services.SettingsBuilder;
  import org.apache.maven.api.services.SettingsBuilderException;
  import org.apache.maven.api.services.SettingsBuilderRequest;
  import org.apache.maven.api.services.SettingsBuilderResult;
  import org.apache.maven.api.services.Source;
  import org.apache.maven.api.settings.Settings;
  import org.apache.maven.settings.building.DefaultSettingsBuildingRequest;
  import org.apache.maven.settings.building.SettingsBuildingException;
  import org.apache.maven.settings.building.SettingsBuildingResult;
  import org.apache.maven.settings.building.SettingsProblem;
  import org.apache.maven.settings.building.SettingsSource;
  
  @Named
  @Singleton
  public class DefaultSettingsBuilder implements SettingsBuilder {
  
      private final org.apache.maven.settings.building.SettingsBuilder builder;
  
      @Inject
      public DefaultSettingsBuilder(org.apache.maven.settings.building.SettingsBuilder builder) {
          this.builder = builder;
      }
  
      @Nonnull
      @Override
      public SettingsBuilderResult build(SettingsBuilderRequest request)
              throws SettingsBuilderException, IllegalArgumentException {
          InternalSession session = InternalSession.from(request.getSession());
          try {
              DefaultSettingsBuildingRequest req = new DefaultSettingsBuildingRequest();
              req.setUserProperties(toProperties(session.getUserProperties()));
              req.setSystemProperties(toProperties(session.getSystemProperties()));
              if (request.getGlobalSettingsSource().isPresent()) {
                  req.setGlobalSettingsSource(new MappedSettingsSource(
                          request.getGlobalSettingsSource().get()));
              }
              if (request.getGlobalSettingsPath().isPresent()) {
                  req.setGlobalSettingsFile(request.getGlobalSettingsPath().get().toFile());
              }
              if (request.getUserSettingsSource().isPresent()) {
                  req.setUserSettingsSource(
                          new MappedSettingsSource(request.getUserSettingsSource().get()));
              }
              if (request.getUserSettingsPath().isPresent()) {
                  req.setUserSettingsFile(request.getUserSettingsPath().get().toFile());
              }
              SettingsBuildingResult result = builder.build(req);
              return new SettingsBuilderResult() {
                  @Override
                  public Settings getEffectiveSettings() {
                      return result.getEffectiveSettings().getDelegate();
                  }
  
                  @Override
                  public List<BuilderProblem> getProblems() {
                      return new MappedList<>(result.getProblems(), MappedBuilderProblem::new);
                  }
              };
          } catch (SettingsBuildingException e) {
              throw new SettingsBuilderException("Unable to build settings", e);
          }
      }
  
      private Properties toProperties(Map<String, String> map) {
          Properties properties = new Properties();
          properties.putAll(map);
          return properties;
     }
 
     private static class MappedSettingsSource implements SettingsSource {
         private final Source source;
 
         MappedSettingsSource(Source source) {
             this.source = source;
         }
 
         @Override
         public InputStream getInputStream() throws IOException {
             return source.openStream();
         }
 
         @Override
         public String getLocation() {
             return source.getLocation();
         }
     }
 
     private static class MappedBuilderProblem implements BuilderProblem {
         private final SettingsProblem problem;
 
         MappedBuilderProblem(SettingsProblem problem) {
             this.problem = problem;
         }
 
         @Override
         public String getSource() {
             return problem.getSource();
         }
 
         @Override
         public int getLineNumber() {
             return problem.getLineNumber();
         }
 
         @Override
         public int getColumnNumber() {
             return problem.getColumnNumber();
         }
 
         @Override
         public String getLocation() {
             return problem.getLocation();
         }
 
         @Override
         public Exception getException() {
             return problem.getException();
         }
 
         @Override
         public String getMessage() {
             return problem.getMessage();
         }
 
         @Override
         public Severity getSeverity() {
             return Severity.valueOf(problem.getSeverity().name());
         }
     }
 }