/*
    * 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.assertDoesNotThrow;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  import java.io.ByteArrayOutputStream;
  import java.io.DataInputStream;
  import java.io.DataOutputStream;
  import java.io.InputStream;
  import java.nio.file.Path;
  import java.util.Enumeration;
  import java.util.jar.JarEntry;
  import java.util.jar.JarFile;
  
  import org.apache.bcel.generic.JavaHome;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.params.ParameterizedTest;
  import org.junit.jupiter.params.provider.MethodSource;
  
  /**
   * Test that dump() methods work on the JDK classes
   */
  public class JDKClassDumpTestCase {
  
      private void compare(final JavaClass jc, final InputStream inputStream, final String name) throws Exception {
          final ByteArrayOutputStream baos = new ByteArrayOutputStream();
          try (DataOutputStream dos = new DataOutputStream(baos)) {
              jc.dump(dos);
          }
          try (DataInputStream src = new DataInputStream(inputStream)) {
              int i = 0;
              for (final int out : baos.toByteArray()) {
                  final int in = src.read();
                  final int j = i;
                  assertEquals(in, out & 0xFF, () -> name + ": Mismatch at " + j);
                  i++;
              }
          }
      }
  
      private void testJar(final Path path) throws Exception {
          try (JarFile jar = new JarFile(path.toFile())) {
              System.out.println("Parsing " + jar.getName());
              final Enumeration<JarEntry> en = jar.entries();
              while (en.hasMoreElements()) {
                  final JarEntry e = en.nextElement();
                  final String name = e.getName();
                  if (name.endsWith(JavaClass.EXTENSION)) {
                      // System.out.println("Parsing " + name);
                      try (InputStream inputStream1 = jar.getInputStream(e);
                              InputStream inputStream2 = jar.getInputStream(e);) {
                          compare(new ClassParser(inputStream1, name).parse(), inputStream2, name);
                      }
                  }
              }
          }
      }
  
      @ParameterizedTest
      @MethodSource("org.apache.bcel.generic.JavaHome#streamJarPath")
      public void testPerformance(final Path path) throws Exception {
          assertDoesNotThrow(() -> testJar(path));
      }
  
      @Test
      public void testPerformanceJmod() throws Exception {
          JavaHome.streamModulePath().forEach(path -> assertDoesNotThrow(() -> testJar(path)));
      }
  }