/*
    * 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.model.interpolation;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import java.io.File;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import org.apache.maven.api.model.Model;
  import org.apache.maven.model.building.ModelBuildingRequest;
  import org.apache.maven.model.building.ModelProblem.Severity;
  import org.apache.maven.model.building.ModelProblem.Version;
  import org.apache.maven.model.building.ModelProblemCollector;
  import org.apache.maven.model.building.ModelProblemCollectorRequest;
  import org.apache.maven.model.path.PathTranslator;
  import org.apache.maven.model.path.UrlNormalizer;
  import org.apache.maven.model.root.RootLocator;
  import org.apache.maven.model.v4.MavenTransformer;
  import org.codehaus.plexus.interpolation.InterpolationException;
  import org.codehaus.plexus.interpolation.InterpolationPostProcessor;
  import org.codehaus.plexus.interpolation.RecursionInterceptor;
  import org.codehaus.plexus.interpolation.StringSearchInterpolator;
  import org.codehaus.plexus.interpolation.ValueSource;
  
  /**
   * StringVisitorModelInterpolator
   *
   * @since 3.6.2
   */
  @Named
  @Singleton
  public class StringVisitorModelInterpolator extends AbstractStringBasedModelInterpolator {
      @Inject
      public StringVisitorModelInterpolator(
              PathTranslator pathTranslator, UrlNormalizer urlNormalizer, RootLocator rootLocator) {
          super(pathTranslator, urlNormalizer, rootLocator);
      }
  
      interface InnerInterpolator {
          String interpolate(String value);
      }
  
      @Override
      public Model interpolateModel(
              Model model, File projectDir, ModelBuildingRequest config, ModelProblemCollector problems) {
          List<? extends ValueSource> valueSources = createValueSources(model, projectDir, config, problems);
          List<? extends InterpolationPostProcessor> postProcessors = createPostProcessors(model, projectDir, config);
  
          InnerInterpolator innerInterpolator = createInterpolator(valueSources, postProcessors, problems, config);
  
          return new MavenTransformer(innerInterpolator::interpolate).visit(model);
      }
  
      private InnerInterpolator createInterpolator(
              List<? extends ValueSource> valueSources,
              List<? extends InterpolationPostProcessor> postProcessors,
              final ModelProblemCollector problems,
              ModelBuildingRequest config) {
          final Map<String, String> cache = new HashMap<>();
          final StringSearchInterpolator interpolator = new StringSearchInterpolator();
          interpolator.setCacheAnswers(true);
          for (ValueSource vs : valueSources) {
              interpolator.addValueSource(vs);
          }
          for (InterpolationPostProcessor postProcessor : postProcessors) {
              interpolator.addPostProcessor(postProcessor);
          }
          final RecursionInterceptor recursionInterceptor = createRecursionInterceptor(config);
          return value -> {
              if (value != null && value.contains("${")) {
                  String c = cache.get(value);
                  if (c == null) {
                      try {
                          c = interpolator.interpolate(value, recursionInterceptor);
                      } catch (InterpolationException e) {
                          problems.add(new ModelProblemCollectorRequest(Severity.ERROR, Version.BASE)
                                  .setMessage(e.getMessage())
                                  .setException(e));
                     }
                     cache.put(value, c);
                 }
                 return c;
             }
             return value;
         };
     }
 }