/*
    * 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.bcel.classfile;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrowsExactly;
  
  import java.io.DataInput;
  import java.util.Map;
  import java.util.Optional;
  
  import org.apache.bcel.AbstractTestCase;
  import org.apache.bcel.Repository;
  import org.apache.bcel.generic.Type;
  import org.junit.jupiter.api.Test;
  
  /**
   *  Tests signatures, including primitives, generics, and bad signatures for exceptions.
   */
  public class SignatureTestCase extends AbstractTestCase {
  
      @Test
      public void testBadSignatures() throws Exception {
          assertThrowsExactly(IllegalArgumentException.class, () -> Signature.translate("<"));
          assertThrowsExactly(IllegalArgumentException.class, () -> Signature.translate("<>"));
      }
  
      @Test
      public void testMap() throws Exception {
          final JavaClass jc = Repository.lookupClass(Map.class);
          final Signature classSignature = (Signature) findAttribute("Signature", jc.getAttributes());
          final String translatedSignature = Signature.translate(classSignature.getSignature());
          assertEquals("<K, V>java.lang.Object", translatedSignature);
          testMethod(jc, "(java.lang.Object)V", Map.class, "get", Object.class);
          testMethod(jc, "(K, V)V", Map.class, "put", Object.class, Object.class);
      }
  
      void testMethod(final JavaClass jc, final String expected, final Class<?> clazz, final String methodName, final Class<?>... paramTypes) throws Exception {
          final Method method = jc.getMethod(clazz.getMethod(methodName, paramTypes));
          final String methodSignature = Optional.ofNullable(method.getGenericSignature()).orElse(method.getSignature());
          final String translatedMethodSignature = Signature.translate(methodSignature);
          assertEquals(expected, translatedMethodSignature);
      }
  
      @Test
      public void testString() throws Exception {
          final JavaClass jc = Repository.lookupClass(String.class);
          final Signature classSignature = (Signature) findAttribute("Signature", jc.getAttributes());
          final String translatedSignature = Signature.translate(classSignature.getSignature());
          assertEquals("java.lang.Object", translatedSignature);
          testMethod(jc, "()java.lang.String", String.class, "trim");
  
      }
  
      @Test
      public void testType() throws Exception {
          assertEquals("(I)I", Type.getSignature(Math.class.getMethod("abs", int.class)));
          assertEquals("(J)J", Type.getSignature(Math.class.getMethod("abs", long.class)));
          assertEquals("(D)D", Type.getSignature(Math.class.getMethod("abs", double.class)));
          assertEquals("(F)F", Type.getSignature(Math.class.getMethod("abs", float.class)));
          assertEquals("(Ljava/lang/String;)[Ljava/lang/String;", Type.getSignature(String.class.getMethod("split", String.class)));
          assertEquals("(I)C", Type.getSignature(String.class.getMethod("charAt", int.class)));
          assertEquals("()Ljava/lang/String;", Type.getSignature(String.class.getMethod("trim")));
          assertEquals("()V", Type.getSignature(Object.class.getMethod("notify")));
          assertEquals("(Ljava/lang/Object;)Z", Type.getSignature(Object.class.getMethod("equals", Object.class)));
          assertEquals("()B", Type.getSignature(DataInput.class.getMethod("readByte")));
          assertEquals("()S", Type.getSignature(DataInput.class.getMethod("readShort")));
      }
  }