/*
    * Copyright 2012-2025 CodeLibs Project and the Others.
    *
    * 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.
   */
  package org.codelibs.fess.entity;
  
  import java.util.Collection;
  import java.util.Map;
  import java.util.Set;
  import java.util.function.BiConsumer;
  import java.util.function.BiFunction;
  import java.util.function.Function;
  
  import org.apache.commons.lang3.StringUtils;
  
  import com.google.common.base.CaseFormat;
  
  /**
   * Parameter map that converts between camelCase and snake_case.
   *
   * @param <K> the key type
   * @param <V> the value type
   */
  public class ParamMap<K, V> implements Map<K, V> {
  
      private final Map<K, V> parent;
  
      /**
       * Creates a new parameter map.
       *
       * @param parent the parent map
       */
      public ParamMap(final Map<K, V> parent) {
          this.parent = parent;
      }
  
      /**
       * Gets the parent map.
       *
       * @return the parent map
       */
      public Map<K, V> getParent() {
          return parent;
      }
  
      /**
       * Converts a key to camelCase.
       *
       * @param key the key to convert
       * @return the converted key
       */
      protected Object toCamelCase(final Object key) {
          if (key == null) {
              return key;
          }
          String keyStr = key.toString();
          if (keyStr.indexOf('_') < 0) {
              keyStr = CaseFormat.LOWER_CAMEL.to(CaseFormat.LOWER_UNDERSCORE, StringUtils.uncapitalize(keyStr));
          } else {
              keyStr = CaseFormat.LOWER_UNDERSCORE.to(CaseFormat.LOWER_CAMEL, keyStr);
          }
          return keyStr;
      }
  
      @Override
      public int size() {
          return parent.size();
      }
  
      @Override
      public boolean isEmpty() {
          return parent.isEmpty();
      }
  
      @Override
      public boolean containsKey(final Object key) {
          if (parent.containsKey(key)) {
              return true;
          }
          return parent.containsKey(toCamelCase(key));
      }
  
      @Override
      public boolean containsValue(final Object value) {
          return parent.containsValue(value);
      }
  
      @Override
     public V get(final Object key) {
         final V value = parent.get(key);
         if (value != null) {
             return value;
         }
         return parent.get(toCamelCase(key));
     }
 
     @Override
     public V put(final K key, final V value) {
         return parent.put(key, value);
     }
 
     @Override
     public V remove(final Object key) {
         final V value = parent.remove(key);
         if (value != null) {
             return value;
         }
         return parent.remove(key);
     }
 
     @Override
     public void putAll(final Map<? extends K, ? extends V> m) {
         parent.putAll(m);
     }
 
     @Override
     public void clear() {
         parent.clear();
     }
 
     @Override
     public Set<K> keySet() {
         // return original keys
         return parent.keySet();
     }
 
     @Override
     public Collection<V> values() {
         return parent.values();
     }
 
     @Override
     public Set<Entry<K, V>> entrySet() {
         // return original keys
         return parent.entrySet();
     }
 
     @Override
     public boolean equals(final Object o) {
         return parent.equals(o);
     }
 
     @Override
     public int hashCode() {
         return parent.hashCode();
     }
 
     @Override
     public V getOrDefault(final Object key, final V defaultValue) {
         final V value = parent.get(key);
         if (value != null) {
             return value;
         }
         return parent.getOrDefault(toCamelCase(key), defaultValue);
     }
 
     @Override
     public void forEach(final BiConsumer<? super K, ? super V> action) {
         parent.forEach(action);
     }
 
     @Override
     public void replaceAll(final BiFunction<? super K, ? super V, ? extends V> function) {
         parent.replaceAll(function);
     }
 
     @Override
     public V putIfAbsent(final K key, final V value) {
         return parent.putIfAbsent(key, value);
     }
 
     @Override
     public boolean remove(final Object key, final Object value) {
         if (parent.remove(key, value)) {
             return true;
         }
         return parent.remove(toCamelCase(key), value);
     }
 
     @Override
     public boolean replace(final K key, final V oldValue, final V newValue) {
         if (parent.replace(key, oldValue, newValue)) {
             return true;
         }
         return parent.replace(key, oldValue, newValue);
     }
 
     @Override
     public V replace(final K key, final V value) {
         // use original key
         return parent.replace(key, value);
     }
 
     @Override
     public V computeIfAbsent(final K key, final Function<? super K, ? extends V> mappingFunction) {
         // use original key
         return parent.computeIfAbsent(key, mappingFunction);
     }
 
     @Override
     public V computeIfPresent(final K key, final BiFunction<? super K, ? super V, ? extends V> remappingFunction) {
         // use original key
         return parent.computeIfPresent(key, remappingFunction);
     }
 
     @Override
     public V compute(final K key, final BiFunction<? super K, ? super V, ? extends V> remappingFunction) {
         // use original key
         return parent.compute(key, remappingFunction);
     }
 
     @Override
     public V merge(final K key, final V value, final BiFunction<? super V, ? super V, ? extends V> remappingFunction) {
         // use original key
         return parent.merge(key, value, remappingFunction);
     }
 }