// 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;

@SuppressWarnings("unused")
public class ReplaceHooks {
  @MethodHook(type = HookType.REPLACE,
      targetClassName = "com.code_intelligence.jazzer.instrumentor.ReplaceHooksTarget",
      targetMethod = "shouldReturnTrue1")
  public static boolean
  patchShouldReturnTrue1(MethodHandle method, Object thisObject, Object[] arguments, int hookId) {
    return true;
  }

  @MethodHook(type = HookType.REPLACE,
      targetClassName = "com.code_intelligence.jazzer.instrumentor.ReplaceHooksTarget",
      targetMethod = "shouldReturnTrue2")
  public static Boolean
  patchShouldReturnTrue2(MethodHandle method, Object thisObject, Object[] arguments, int hookId) {
    return true;
  }

  @MethodHook(type = HookType.REPLACE,
      targetClassName = "com.code_intelligence.jazzer.instrumentor.ReplaceHooksTarget",
      targetMethod = "shouldReturnTrue3")
  public static Object
  patchShouldReturnTrue3(MethodHandle method, Object thisObject, Object[] arguments, int hookId) {
    return true;
  }

  @MethodHook(type = HookType.REPLACE,
      targetClassName = "com.code_intelligence.jazzer.instrumentor.ReplaceHooksTarget",
      targetMethod = "shouldReturnFalse1")
  public static Boolean
  patchShouldReturnFalse1(MethodHandle method, Object thisObject, Object[] arguments, int hookId) {
    return false;
  }

  @MethodHook(type = HookType.REPLACE,
      targetClassName = "com.code_intelligence.jazzer.instrumentor.ReplaceHooksTarget",
      targetMethod = "shouldReturnFalse2")
  @MethodHook(type = HookType.REPLACE,
      targetClassName = "com.code_intelligence.jazzer.instrumentor.ReplaceHooksTarget",
      targetMethod = "shouldReturnFalse3")
  public static Object
  patchShouldReturnFalse2(MethodHandle method, Object thisObject, Object[] arguments, int hookId) {
    return false;
  }

  @MethodHook(type = HookType.REPLACE,
      targetClassName = "com.code_intelligence.jazzer.instrumentor.ReplaceHooksTarget",
      targetMethod = "shouldReturnReversed",
      targetMethodDescriptor = "(Ljava/lang/String;)Ljava/lang/String;")
  public static String
  patchShouldReturnReversed(
      MethodHandle method, Object thisObject, Object[] arguments, int hookId) {
    return new StringBuilder((String) arguments[0]).reverse().toString();
  }

  @MethodHook(type = HookType.REPLACE,
      targetClassName = "com.code_intelligence.jazzer.instrumentor.ReplaceHooksTarget",
      targetMethod = "shouldIncrement")
  public static int
  patchShouldIncrement(MethodHandle method, Object thisObject, Object[] arguments, int hookId) {
    return ((int) arguments[0]) + 1;
  }

  @MethodHook(type = HookType.REPLACE,
      targetClassName = "com.code_intelligence.jazzer.instrumentor.ReplaceHooksTarget",
      targetMethod = "shouldCallPass")
  public static void
  patchShouldCallPass(MethodHandle method, Object thisObject, Object[] arguments, int hookId) {
    ((ReplaceHooksTargetContract) thisObject).pass("shouldCallPass");
  }

  @MethodHook(type = HookType.REPLACE,
      targetClassName = "com.code_intelligence.jazzer.instrumentor.ReplaceHooksTarget",
      targetMethod = "idempotent", targetMethodDescriptor = "(I)I")
  public static int
  patchIdempotent(MethodHandle method, Object thisObject, Object[] arguments, int hookId)
      throws Throwable {
    // Iterate the function twice to pass the test.
    int input = (int) arguments[0];
    int temp = (int) method.invokeWithArguments(thisObject, input);
    return (int) method.invokeWithArguments(thisObject, temp);
  }

  @MethodHook(type = HookType.REPLACE, targetClassName = "java.util.AbstractList",
      targetMethod = "get", targetMethodDescriptor = "(I)Ljava/lang/Object;")
  public static Object
  patchAbstractListGet(MethodHandle method, Object thisObject, Object[] arguments, int hookId) {
    return true;
  }

  @MethodHook(type = HookType.REPLACE, targetClassName = "java.util.Set", targetMethod = "contains",
      targetMethodDescriptor = "(Ljava/lang/Object;)Z")
  public static boolean
  patchSetGet(MethodHandle method, Object thisObject, Object[] arguments, int hookId) {
    return true;
  }

  @MethodHook(type = HookType.REPLACE,
      targetClassName = "com.code_intelligence.jazzer.instrumentor.ReplaceHooksInit",
      targetMethod = "<init>", targetMethodDescriptor = "()V")
  public static ReplaceHooksInit
  patchInit(MethodHandle method, Object thisObject, Object[] arguments, int hookId) {
    // Test with subclass
    return new ReplaceHooksInit() {
      { initialized = true; }
    };
  }

  @MethodHook(type = HookType.REPLACE,
      targetClassName = "com.code_intelligence.jazzer.instrumentor.ReplaceHooksInit",
      targetMethod = "<init>", targetMethodDescriptor = "(ZLjava/lang/String;)V")
  public static ReplaceHooksInit
  patchInitWithParams(MethodHandle method, Object thisObject, Object[] arguments, int hookId) {
    return new ReplaceHooksInit(true, "");
  }
}