package com.github.mygreen.supercsv.validation.beanvalidation;
   
   import java.util.HashMap;
   import java.util.Locale;
   import java.util.Map;
   import java.util.Objects;
   
   import javax.validation.metadata.ConstraintDescriptor;
   
  import com.github.mygreen.supercsv.localization.MessageInterpolator;
  import com.github.mygreen.supercsv.localization.MessageResolver;
  
  /**
   * SuperCsvAnnotationの{@link MessageInterpolator}とBeanValidationの{@link javax.validation.MessageInterpolator}をブリッジする。
   * <p>BeanValidationのメッセージ処理をカスタマイズするために利用する。</p>
   *
   * @version 2.3
   * @since 2.0
   * @author T.TSUCHIE
   *
   */
  public class MessageInterpolatorAdapter implements javax.validation.MessageInterpolator {
      
      private final MessageResolver messageResolver;
      
      private final MessageInterpolator csvMessageInterpolator;
      
      /**
       * SuperCsvAnnotation用のメッセージソースとInterpolatorを指定してBeanValidationのMessageInterpolatorを作成します。
       * 
       * @param messageResolver SuperCsvAnnotation用のメッセージソース。
       * @param csvMessageInterpolator SuperCsvAnnotation用のMessageInterpolator。
       * @throws NullPointerException {@literal if messageResolver or csvMessageInterpolator is null.}
       */
      public MessageInterpolatorAdapter(final MessageResolver messageResolver, final MessageInterpolator csvMessageInterpolator) {
          Objects.requireNonNull(messageResolver);
          Objects.requireNonNull(csvMessageInterpolator);
          
          this.messageResolver = messageResolver;
          this.csvMessageInterpolator = csvMessageInterpolator;
      }
      
      @Override
      public String interpolate(final String messageTemplate, final Context context) {
          return csvMessageInterpolator.interpolate(messageTemplate, createMessageVariables(context), true, messageResolver);
      }
      
      @Override
      public String interpolate(final String messageTemplate, final Context context, final Locale locale) {
          return csvMessageInterpolator.interpolate(messageTemplate, createMessageVariables(context), true, messageResolver);
      }
      
      /**
       * メッセージ中で利用可能な変数を作成する
       * @param context コンテキスト
       * @return メッセージ変数のマップ
       */
      private Map<String, Object> createMessageVariables(final Context context) {
          
          final Map<String, Object> vars = new HashMap<>();
          
          final ConstraintDescriptor<?> descriptor = context.getConstraintDescriptor();
          for(Map.Entry<String, Object> entry : descriptor.getAttributes().entrySet()) {
              final String attrName = entry.getKey();
              final Object attrValue = entry.getValue();
              
              vars.put(attrName, attrValue);
          }
          
          // 検証対象の値
          vars.computeIfAbsent("validatedValue", key -> context.getValidatedValue());
          
          return vars;
          
      }
      
      public MessageResolver getMessageResolver() {
          return messageResolver;
      }
      
      public MessageInterpolator getCsvMessageInterpolator() {
          return csvMessageInterpolator;
      }
      
  }