/*
    * Copyright (c) 2006 JMockit developers
    * This file is subject to the terms of the MIT license (see LICENSE.txt).
    */
   package mockit.internal.expectations.argumentMatching;
   
   import edu.umd.cs.findbugs.annotations.NonNull;
   import edu.umd.cs.findbugs.annotations.Nullable;
   
  import mockit.internal.reflection.FieldReflection;
  
  import org.hamcrest.Description;
  import org.hamcrest.Matcher;
  import org.hamcrest.StringDescription;
  import org.hamcrest.core.Is;
  import org.hamcrest.core.IsEqual;
  import org.hamcrest.core.IsNot;
  import org.hamcrest.core.IsSame;
  
  /**
   * Adapts the <code>org.hamcrest.Matcher</code> interface to {@link ArgumentMatcher}.
   */
  public final class HamcrestAdapter implements ArgumentMatcher<HamcrestAdapter> {
      @NonNull
      private final Matcher<?> hamcrestMatcher;
  
      public HamcrestAdapter(@NonNull Matcher<?> matcher) {
          hamcrestMatcher = matcher;
      }
  
      @Override
      public boolean same(@NonNull HamcrestAdapter other) {
          return hamcrestMatcher == other.hamcrestMatcher;
      }
  
      @Override
      public boolean matches(@Nullable Object argValue) {
          return hamcrestMatcher.matches(argValue);
      }
  
      @Override
      public void writeMismatchPhrase(@NonNull ArgumentMismatch argumentMismatch) {
          Description strDescription = new StringDescription();
          hamcrestMatcher.describeTo(strDescription);
          argumentMismatch.append(strDescription.toString());
      }
  
      @Nullable
      public Object getInnerValue() {
          Object innermostMatcher = getInnermostMatcher();
          return getArgumentValueFromMatcherIfAvailable(innermostMatcher);
      }
  
      @NonNull
      private Object getInnermostMatcher() {
          Matcher<?> innerMatcher = hamcrestMatcher;
  
          while (innerMatcher instanceof Is || innerMatcher instanceof IsNot) {
              innerMatcher = FieldReflection.getField(innerMatcher.getClass(), Matcher.class, innerMatcher);
          }
  
          assert innerMatcher != null;
          return innerMatcher;
      }
  
      @Nullable
      private static Object getArgumentValueFromMatcherIfAvailable(@NonNull Object argMatcher) {
          if (argMatcher instanceof IsEqual || argMatcher instanceof IsSame
                  || "org.hamcrest.number.OrderingComparison".equals(argMatcher.getClass().getName())) {
              return FieldReflection.getField(argMatcher.getClass(), Object.class, argMatcher);
          }
  
          return null;
      }
  }