/*
    * 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.plugins.enforcer.internal;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  import javax.inject.Provider;
  import javax.inject.Singleton;
  
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import org.apache.maven.enforcer.rule.api.AbstractEnforcerRule;
  import org.apache.maven.execution.MavenSession;
  import org.eclipse.aether.SessionData;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Service for manage rules cache storage.
   *
   * @author Slawomir Jaranowski
   * @since 3.2.0
   */
  @Named
  @Singleton
  public class EnforcerRuleCache {
  
      private final Logger logger = LoggerFactory.getLogger(EnforcerRuleCache.class);
  
      private final Provider<MavenSession> sessionProvider;
  
      @Inject
      EnforcerRuleCache(Provider<MavenSession> sessionProvider) {
          this.sessionProvider = sessionProvider;
      }
  
      @SuppressWarnings("unchecked")
      public boolean isCached(AbstractEnforcerRule rule) {
  
          String cacheId = rule.getCacheId();
  
          if (cacheId == null) {
              return false;
          }
  
          Class<? extends AbstractEnforcerRule> ruleClass = rule.getClass();
          logger.debug("Check cache for {} with id {}", ruleClass, cacheId);
  
          SessionData sessionData = sessionProvider.get().getRepositorySession().getData();
  
          synchronized (this) {
  
              // sessionData.computeIfAbsent() is available in Maven 3.9.x, so do it manually
              Map<Class<? extends AbstractEnforcerRule>, List<String>> cache =
                      (Map<Class<? extends AbstractEnforcerRule>, List<String>>) sessionData.get("enforcer-cache");
  
              if (cache == null) {
                  cache = new HashMap<>();
                  sessionData.set("enforcer-cache", cache);
              }
  
              List<String> cacheIdList = cache.computeIfAbsent(ruleClass, k -> new ArrayList<>());
              if (cacheIdList.contains(cacheId)) {
                  logger.debug("Already cached {} with id {}", ruleClass, cacheId);
                  return true;
              }
              logger.debug("Add cache {} with id {}", ruleClass, cacheId);
              cacheIdList.add(cacheId);
          }
  
          return false;
      }
  }