// ASM: a very small and fast Java bytecode manipulation framework
// Copyright (c) 2000-2011 INRIA, France Telecom
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
// 3. Neither the name of the copyright holders nor the names of its
//    contributors may be used to endorse or promote products derived from
//    this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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package org.objectweb.asm.commons;

import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;

import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.MethodSource;
import org.objectweb.asm.Attribute;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.ConstantDynamic;
import org.objectweb.asm.Handle;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Type;
import org.objectweb.asm.test.AsmTest;

/**
 * CodeSizeEvaluator tests.
 *
 * @author Eric Bruneton
 */
public class CodeSizeEvaluatorTest extends AsmTest {

  /**
   * Tests that the size estimations of CodeSizeEvaluator are correct, and that classes are
   * unchanged with a ClassReader->CodeSizeEvaluator->ClassWriter transform.
   */
  @ParameterizedTest
  @MethodSource(ALL_CLASSES_AND_ALL_APIS)
  public void testSizeEvaluation(final PrecompiledClass classParameter, final Api apiParameter) {
    byte[] classFile = classParameter.getBytes();
    ClassReader classReader = new ClassReader(classFile);
    ClassWriter classWriter = new ClassWriter(0);
    ClassVisitor classVisitor =
        new ClassVisitor(apiParameter.value(), classWriter) {
          @Override
          public MethodVisitor visitMethod(
              final int access,
              final String name,
              final String descriptor,
              final String signature,
              final String[] exceptions) {
            MethodVisitor methodVisitor =
                super.visitMethod(access, name, descriptor, signature, exceptions);
            return new CodeSizeEvaluator(api, methodVisitor) {

              @Override
              public void visitLdcInsn(final Object value) {
                if (value instanceof Boolean
                    || value instanceof Byte
                    || value instanceof Short
                    || value instanceof Character
                    || value instanceof Integer
                    || value instanceof Long
                    || value instanceof Double
                    || value instanceof Float
                    || value instanceof String
                    || value instanceof Type
                    || value instanceof Handle
                    || value instanceof ConstantDynamic) {
                  super.visitLdcInsn(value);
                } else {
                  // If this happens, add support for the new type in
                  // CodeSizeEvaluator.visitLdcInsn(), if needed.
                  throw new IllegalArgumentException("Unsupported type of value: " + value);
                }
              }

              @Override
              public void visitMaxs(final int maxStack, final int maxLocals) {
                Label end = new Label();
                visitLabel(end);
                super.visitMaxs(maxStack, maxLocals);
                int actualSize = end.getOffset();
                assertTrue(getMinSize() <= actualSize);
                assertTrue(actualSize <= getMaxSize());
              }
            };
          }
        };
    if (classParameter.isMoreRecentThan(apiParameter)) {
      assertThrows(RuntimeException.class, () -> classReader.accept(classVisitor, attributes(), 0));
      return;
    }
    classReader.accept(classVisitor, attributes(), 0);
    assertThatClass(classWriter.toByteArray()).isEqualTo(classFile);
  }

  private static Attribute[] attributes() {
    return new Attribute[] {new Comment(), new CodeComment()};
  }
}
