/*
    * 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.configuration.internal;
  
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import java.io.File;
  import java.util.Objects;
  
  import org.apache.maven.configuration.BeanConfigurationException;
  import org.apache.maven.configuration.BeanConfigurationPathTranslator;
  import org.apache.maven.configuration.BeanConfigurationRequest;
  import org.apache.maven.configuration.BeanConfigurationValuePreprocessor;
  import org.apache.maven.configuration.BeanConfigurator;
  import org.codehaus.plexus.component.configurator.ComponentConfigurationException;
  import org.codehaus.plexus.component.configurator.converters.composite.ObjectWithFieldsConverter;
  import org.codehaus.plexus.component.configurator.converters.lookup.ConverterLookup;
  import org.codehaus.plexus.component.configurator.converters.lookup.DefaultConverterLookup;
  import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluationException;
  import org.codehaus.plexus.component.configurator.expression.TypeAwareExpressionEvaluator;
  import org.codehaus.plexus.configuration.PlexusConfiguration;
  import org.codehaus.plexus.configuration.xml.XmlPlexusConfiguration;
  import org.codehaus.plexus.util.xml.Xpp3Dom;
  
  /**
   * <strong>Warning:</strong> This is an internal class that is only public for technical reasons, it is not part of the
   * public API. In particular, this class can be changed or deleted without prior notice.
   *
   * @author Benjamin Bentmann
   */
  @Singleton
  @Named
  public class DefaultBeanConfigurator implements BeanConfigurator {
  
      private final ConverterLookup converterLookup = new DefaultConverterLookup();
  
      public void configureBean(BeanConfigurationRequest request) throws BeanConfigurationException {
          Objects.requireNonNull(request, "request cannot be null");
          Objects.requireNonNull(request.getBean(), "request.bean cannot be null");
  
          Object configuration = request.getConfiguration();
          if (configuration == null) {
              return;
          }
  
          PlexusConfiguration plexusConfig;
          if (configuration instanceof PlexusConfiguration) {
              plexusConfig = (PlexusConfiguration) configuration;
          } else if (configuration instanceof Xpp3Dom) {
              plexusConfig = new XmlPlexusConfiguration((Xpp3Dom) configuration);
          } else {
              throw new BeanConfigurationException("unsupported bean configuration source ("
                      + configuration.getClass().getName() + ")");
          }
  
          if (request.getConfigurationElement() != null) {
              plexusConfig = plexusConfig.getChild(request.getConfigurationElement());
          }
  
          ClassLoader classLoader = request.getClassLoader();
          if (classLoader == null) {
              classLoader = request.getBean().getClass().getClassLoader();
          }
  
          BeanExpressionEvaluator evaluator = new BeanExpressionEvaluator(request);
  
          ObjectWithFieldsConverter converter = new ObjectWithFieldsConverter();
  
          try {
              converter.processConfiguration(converterLookup, request.getBean(), classLoader, plexusConfig, evaluator);
          } catch (ComponentConfigurationException e) {
              throw new BeanConfigurationException(e.getMessage(), e);
          }
      }
  
      static class BeanExpressionEvaluator implements TypeAwareExpressionEvaluator {
  
          private final BeanConfigurationValuePreprocessor preprocessor;
  
          private final BeanConfigurationPathTranslator translator;
  
          BeanExpressionEvaluator(BeanConfigurationRequest request) {
             preprocessor = request.getValuePreprocessor();
             translator = request.getPathTranslator();
         }
 
         public Object evaluate(String expression, Class<?> type) throws ExpressionEvaluationException {
             if (preprocessor != null) {
                 try {
                     return preprocessor.preprocessValue(expression, type);
                 } catch (BeanConfigurationException e) {
                     throw new ExpressionEvaluationException(e.getMessage(), e);
                 }
             }
             return expression;
         }
 
         public Object evaluate(String expression) throws ExpressionEvaluationException {
             return evaluate(expression, null);
         }
 
         public File alignToBaseDirectory(File file) {
             if (translator != null) {
                 return translator.translatePath(file);
             }
             return file;
         }
     }
 }