// Copyright 2021 Code Intelligence GmbH
//
// Licensed 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 com.code_intelligence.jazzer.instrumentor;

import com.code_intelligence.jazzer.api.HookType;
import com.code_intelligence.jazzer.api.MethodHook;
import java.lang.invoke.MethodHandle;

public class BeforeHooks {
  @MethodHook(type = HookType.BEFORE,
      targetClassName = "com.code_intelligence.jazzer.instrumentor.BeforeHooksTarget",
      targetMethod = "hasFunc1BeenCalled", targetMethodDescriptor = "()Z")
  public static void
  patchHasFunc1BeenCalled(MethodHandle method, Object thisObject, Object[] arguments, int hookId) {
    ((BeforeHooksTargetContract) thisObject).func1();
  }

  @MethodHook(type = HookType.BEFORE,
      targetClassName = "com.code_intelligence.jazzer.instrumentor.BeforeHooksTarget",
      targetMethod = "getTimesCalled", targetMethodDescriptor = "()Ljava/lang/Integer;")
  public static void
  patchHasBeenCalled(MethodHandle method, Object thisObject, Object[] arguments, int hookId)
      throws Throwable {
    // Invoke static method getTimesCalled() again to pass the test.
    method.invoke();
  }

  @MethodHook(type = HookType.BEFORE,
      targetClassName = "com.code_intelligence.jazzer.instrumentor.BeforeHooksTarget",
      targetMethod = "hasFuncWithArgsBeenCalled")
  public static void
  patchHasFuncWithArgsBeenCalled(
      MethodHandle method, Object thisObject, Object[] arguments, int hookId) {
    if (arguments.length == 2 && arguments[0] instanceof Boolean
        && arguments[1] instanceof String) {
      // only if the arguments passed to the hook match the expected argument types and count invoke
      // the method to pass the test
      ((BeforeHooksTargetContract) thisObject).setFuncWithArgsCalled((Boolean) arguments[0]);
    }
  }
}