/*
    * 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.buildcache;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  
  import java.util.LinkedHashSet;
  import java.util.Set;
  import java.util.concurrent.ConcurrentHashMap;
  import java.util.concurrent.ConcurrentMap;
  
  import org.apache.maven.SessionScoped;
  import org.apache.maven.buildcache.checksum.MavenProjectInput;
  import org.apache.maven.buildcache.xml.CacheConfig;
  import org.apache.maven.buildcache.xml.build.ProjectsInputInfo;
  import org.apache.maven.execution.MavenSession;
  import org.apache.maven.lifecycle.internal.builder.BuilderCommon;
  import org.apache.maven.project.MavenProject;
  import org.apache.maven.repository.RepositorySystem;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  @SessionScoped
  @Named
  public class DefaultProjectInputCalculator implements ProjectInputCalculator {
  
      private static final Logger LOGGER = LoggerFactory.getLogger(DefaultProjectInputCalculator.class);
  
      private final MavenSession mavenSession;
      private final RemoteCacheRepository remoteCache;
      private final CacheConfig cacheConfig;
      private final RepositorySystem repoSystem;
      private final NormalizedModelProvider normalizedModelProvider;
      private final MultiModuleSupport multiModuleSupport;
  
      private final ConcurrentMap<String, ProjectsInputInfo> checkSumMap = new ConcurrentHashMap<>();
  
      private static final ThreadLocal<Set<String>> CURRENTLY_CALCULATING = ThreadLocal.withInitial(LinkedHashSet::new);
  
      @Inject
      public DefaultProjectInputCalculator(
              MavenSession mavenSession,
              RemoteCacheRepository remoteCache,
              CacheConfig cacheConfig,
              RepositorySystem repoSystem,
              NormalizedModelProvider rawModelProvider,
              MultiModuleSupport multiModuleSupport) {
          this.mavenSession = mavenSession;
          this.remoteCache = remoteCache;
          this.cacheConfig = cacheConfig;
          this.repoSystem = repoSystem;
          this.normalizedModelProvider = rawModelProvider;
          this.multiModuleSupport = multiModuleSupport;
      }
  
      @Override
      public ProjectsInputInfo calculateInput(MavenProject project) {
          LOGGER.info(
                  "Going to calculate checksum for project [groupId={}, artifactId={}, version={}]",
                  project.getGroupId(),
                  project.getArtifactId(),
                  project.getVersion());
  
          String key = BuilderCommon.getKey(project);
          // NOTE: Do not use ConcurrentHashMap.computeIfAbsent() here because of recursive calls
          // this could lead to runtime exception - IllegalStateException("Recursive update")
          // in jdk 8 the result of attempt to modify items with the same hash code could lead to infinite loop
          ProjectsInputInfo projectsInputInfo = checkSumMap.get(key);
          if (projectsInputInfo != null) {
              return projectsInputInfo;
          }
          projectsInputInfo = calculateInputInternal(key, project);
          checkSumMap.put(key, projectsInputInfo);
          return projectsInputInfo;
      }
  
      private ProjectsInputInfo calculateInputInternal(String key, MavenProject project) {
          Set<String> projectsSet = CURRENTLY_CALCULATING.get();
  
          if (!projectsSet.add(key)) {
              throw new IllegalStateException("Checksum for project is already calculating. "
                      + "Is there a cyclic dependencies? [project=" + key
                     + ", setOfCalculatingProjects=" + projectsSet + "]");
         }
         try {
             final MavenProjectInput input = new MavenProjectInput(
                     project,
                     normalizedModelProvider,
                     multiModuleSupport,
                     this,
                     mavenSession,
                     cacheConfig,
                     repoSystem,
                     remoteCache);
             return input.calculateChecksum();
         } catch (Exception e) {
             throw new RuntimeException("Failed to calculate checksums for " + project.getArtifactId(), e);
         } finally {
             projectsSet.remove(key);
         }
     }
 }