content: package act.i18n;
  
  /*-
   * #%L
   * ACT Framework
   * %%
   * Copyright (C) 2014 - 2018 ActFramework
   * %%
   * Licensed 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.
   * #L%
   */
  
  import act.app.App;
  import act.job.OnAppStart;
  import act.util.ClassInfoRepository;
  import act.util.ClassNode;
  import act.util.LogSupport;
  import org.osgl.$;
  import org.osgl.Lang;
  import org.osgl.util.Keyword;
  
  import java.util.*;
  import javax.inject.Singleton;
  
  @Singleton
  public class EnumLookupCache extends LogSupport {
  
      private Map<String, Class<? extends Enum>> eligibleEnums = new HashMap<>();
      private int eligibleEnumSize;
  
      // locale
      // -> enum type name (as keyword)
      // --> enum name
      // ---> enum message
      private Map<Locale, Map<Keyword, Map<String, String>>> withoutProperties = new HashMap<>();
  
      // locale
      // -> enum type name (as keyword)
      // --> enum name
      // ---> enum field name
      // ----> enum field value
      private Map<Locale, Map<Keyword, Map<String, Map<String, Object>>>> withProperties = new HashMap<>();
  
      public Map<Keyword, Map<String, String>> withoutProperties(Locale locale) {
          return ensureWithoutProperties(locale);
      }
  
      public Map<Keyword, Map<String, Map<String, Object>>> withProperties(Locale locale) {
          return ensureWithProperties(locale);
      }
  
      public Map<String, String> withoutProperties(String enumTypeName, Locale locale) {
          Map<Keyword, Map<String, String>> map = ensureWithoutProperties(locale);
          return map.get(Keyword.of(enumTypeName));
      }
  
      public Map<String, Map<String, Object>> withProperties(String enumTypeName, Locale locale) {
          Map<Keyword, Map<String, Map<String, Object>>> map = ensureWithProperties(locale);
          return map.get(Keyword.of(enumTypeName));
      }
  
      @OnAppStart(async = true)
      public void loadEligibleEnums(ClassInfoRepository repo, final App app) {
          final ClassNode enumRoot = repo.node(Enum.class.getName());
          final $.Predicate<String> tester = app.config().appClassTester();
          enumRoot.visitSubTree(new Lang.Visitor<ClassNode>() {
              @Override
              public void visit(ClassNode classNode) throws Lang.Break {
                  String name = classNode.name();
                  if (tester.test(name) && !name.startsWith("act.")) {
                      Class<? extends Enum> enumType = $.cast(app.classForName(name));
                      Object[] constants = enumType.getEnumConstants();
                      if (null != constants && constants.length > 0) {
                          String simpleName = enumType.getSimpleName();
                          Class<?> existing = eligibleEnums.get(simpleName);
                          if (null != existing && existing.getName().equals(enumType.getName())) {
                              warn("Ambiguous enum name found between %s and %s", existing.getName(), enumType.getName());
                          } else {
                              eligibleEnums.put(simpleName, enumType);
                          }
                      }
                  }
              }
          });
          eligibleEnumSize = eligibleEnums.size();
      }
  
      private Map<Keyword, Map<String, String>> ensureWithoutProperties(Locale locale) {
          Map<Keyword, Map<String, String>> map = withoutProperties.get(locale);
          if (null == map) {
              map = new HashMap<>();
              withoutProperties.put(locale, map);
          }
          if (map.size() < eligibleEnumSize) {
              populateWithoutProperties(map, locale);
          }
          return map;
      }
  
      private Map<Keyword, Map<String, Map<String, Object>>> ensureWithProperties(Locale locale) {
          Map<Keyword, Map<String, Map<String, Object>>> map = withProperties.get(locale);
          if (null == map) {
              map = new HashMap<>();
              withProperties.put(locale, map);
          }
          if (map.size() < eligibleEnumSize) {
              populateWithProperties(map, locale);
          }
          return map;
      }
  
      private void populateWithoutProperties(Map<Keyword, Map<String, String>> withoutProperties, Locale locale) {
          for (Map.Entry<String, Class<? extends Enum>> entry: eligibleEnums.entrySet()) {
              String key = entry.getKey();
              if (!withoutProperties.containsKey(key)) {
                  Map<String, String> map = $.cast(I18n.i18n(locale, entry.getValue()));
                  withoutProperties.put(Keyword.of(key), map);
              }
          }
      }
  
      private void populateWithProperties(Map<Keyword, Map<String, Map<String, Object>>> withProperties, Locale locale) {
          for (Map.Entry<String, Class<? extends Enum>> entry: eligibleEnums.entrySet()) {
              String key = entry.getKey();
              if (!withProperties.containsKey(key)) {
                  Map<String, Map<String, Object>> map = $.cast(I18n.i18n(locale, entry.getValue(), true));
                  withProperties.put(Keyword.of(key), map);
              }
          }
      }
  }
  