/*
    * 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.execution;
  
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import java.io.IOException;
  import java.io.Reader;
  import java.io.Writer;
  import java.nio.file.Files;
  import java.nio.file.Path;
  import java.nio.file.Paths;
  import java.util.Properties;
  import java.util.stream.Stream;
  
  import org.apache.maven.project.MavenProject;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * This implementation of {@link BuildResumptionDataRepository} persists information in a properties file. The file is
   * stored in the build output directory under the Maven execution root.
   */
  @Named
  @Singleton
  public class DefaultBuildResumptionDataRepository implements BuildResumptionDataRepository {
      private static final String RESUME_PROPERTIES_FILENAME = "resume.properties";
      private static final String REMAINING_PROJECTS = "remainingProjects";
      private static final String PROPERTY_DELIMITER = ", ";
      private static final Logger LOGGER = LoggerFactory.getLogger(DefaultBuildResumptionDataRepository.class);
  
      @Override
      public void persistResumptionData(MavenProject rootProject, BuildResumptionData buildResumptionData)
              throws BuildResumptionPersistenceException {
          Properties properties = convertToProperties(buildResumptionData);
  
          Path resumeProperties = Paths.get(rootProject.getBuild().getDirectory(), RESUME_PROPERTIES_FILENAME);
          try {
              Files.createDirectories(resumeProperties.getParent());
              try (Writer writer = Files.newBufferedWriter(resumeProperties)) {
                  properties.store(writer, null);
              }
          } catch (IOException e) {
              String message = "Could not create " + RESUME_PROPERTIES_FILENAME + " file.";
              throw new BuildResumptionPersistenceException(message, e);
          }
      }
  
      private Properties convertToProperties(final BuildResumptionData buildResumptionData) {
          Properties properties = new Properties();
  
          String value = String.join(PROPERTY_DELIMITER, buildResumptionData.getRemainingProjects());
          properties.setProperty(REMAINING_PROJECTS, value);
  
          return properties;
      }
  
      @Override
      public void applyResumptionData(MavenExecutionRequest request, MavenProject rootProject) {
          Properties properties =
                  loadResumptionFile(Paths.get(rootProject.getBuild().getDirectory()));
          applyResumptionProperties(request, properties);
      }
  
      @Override
      public void removeResumptionData(MavenProject rootProject) {
          Path resumeProperties = Paths.get(rootProject.getBuild().getDirectory(), RESUME_PROPERTIES_FILENAME);
          try {
              Files.deleteIfExists(resumeProperties);
          } catch (IOException e) {
              LOGGER.warn("Could not delete {} file. ", RESUME_PROPERTIES_FILENAME, e);
          }
      }
  
      private Properties loadResumptionFile(Path rootBuildDirectory) {
          Properties properties = new Properties();
          Path path = rootBuildDirectory.resolve(RESUME_PROPERTIES_FILENAME);
          if (!Files.exists(path)) {
              LOGGER.warn("The {} file does not exist. The --resume / -r feature will not work.", path);
              return properties;
          }
  
         try (Reader reader = Files.newBufferedReader(path)) {
             properties.load(reader);
         } catch (IOException e) {
             LOGGER.warn("Unable to read {}. The --resume / -r feature will not work.", path);
         }
 
         return properties;
     }
 
     // This method is made package-private for testing purposes
     void applyResumptionProperties(MavenExecutionRequest request, Properties properties) {
         String str1 = request.getResumeFrom();
         if (properties.containsKey(REMAINING_PROJECTS) && !(str1 != null && !str1.isEmpty())) {
             String propertyValue = properties.getProperty(REMAINING_PROJECTS);
             Stream.of(propertyValue.split(PROPERTY_DELIMITER))
                     .filter(str -> str != null && !str.isEmpty())
                     .forEach(request.getProjectActivation()::activateOptionalProject);
             LOGGER.info("Resuming from {} due to the --resume / -r feature.", propertyValue);
         }
     }
 }