// Copyright (c) 2018, the R8 project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

package com.android.tools.r8.compatproguard.reflection;

import static com.android.tools.r8.utils.codeinspector.Matchers.isPresentAndRenamed;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.junit.Assert.assertEquals;

import com.android.tools.r8.KeepConstantArguments;
import com.android.tools.r8.NeverInline;
import com.android.tools.r8.R8Command;
import com.android.tools.r8.TestBase;
import com.android.tools.r8.ToolHelper;
import com.android.tools.r8.origin.Origin;
import com.android.tools.r8.utils.AndroidApp;
import com.android.tools.r8.utils.codeinspector.CodeInspector;
import com.google.common.collect.ImmutableList;
import java.lang.reflect.Method;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;

class A {

  public void method0() {
    System.out.print(0);
  }

  public void method1(String s) {
    System.out.print(s);
  }

  public void method2(String s1, String s2) {
    System.out.print(s1 + s2);
  }

  public void method3(int i1, int i2) {
    System.out.print(i1 + i2);
  }
}

class MainTest {
  @SuppressWarnings("warning")
  public static void main(String[] args) throws Exception {
    A a = new A();

    Method m;
    m = A.class.getMethod("method0");
    m.invoke(a);
    // The call with in-exact argument to getMethod is intended and should stay.
    // The warning cannot be suppressed according to b/117198454.
    m = A.class.getMethod("method0", null);
    m.invoke(a);
    m = A.class.getMethod("method0", (Class<?>[]) null);
    m.invoke(a);
    m = A.class.getMethod("method0", (Class<?>[]) (Class<?>[]) null);
    m.invoke(a);
    m = A.class.getMethod("method0", (Class<?>[]) (Object[]) (Class<?>[]) null);
    m.invoke(a);
    m = A.class.getMethod("method1", String.class);
    m.invoke(a, "1");
    m = A.class.getMethod("method2", String.class, String.class);
    m.invoke(a, "2", "3");
    m = A.class.getDeclaredMethod("method0");
    m.invoke(a);
    m = A.class.getDeclaredMethod("method1", String.class);
    m.invoke(a, "1");
    m = A.class.getDeclaredMethod("method2", String.class, String.class);
    m.invoke(a, "2", "3");
    m = A.class.getDeclaredMethod("method3", int.class, int.class);
    m.invoke(a, 2, 2);

    try {
      m = A.class.getMethod("method0");
      m.invoke(a);
      m = A.class.getMethod("method1", String.class);
      m.invoke(a, "1");
      m = A.class.getMethod("method2", String.class, String.class);
      m.invoke(a, "2", "3");
      m = A.class.getDeclaredMethod("method0");
      m.invoke(a);
      m = A.class.getDeclaredMethod("method1", String.class);
      m.invoke(a, "1");
      m = A.class.getDeclaredMethod("method2", String.class, String.class);
      m.invoke(a, "2", "3");
      m = A.class.getDeclaredMethod("method3", int.class, int.class);
      m.invoke(a, 2, 2);
    } catch (Exception e) {
      System.out.println("Unexpected: " + e);
    }

    Class<?>[] argumentTypes;
    argumentTypes = new Class<?>[2];
    argumentTypes[1] = int.class;
    argumentTypes[0] = int.class;
    argumentTypes[0] = String.class;
    argumentTypes[1] = String.class;
    m = A.class.getDeclaredMethod("method2", argumentTypes);
    m.invoke(a, "2", "3");
    argumentTypes[0] = String.class;
    argumentTypes[1] = String.class;
    m = A.class.getDeclaredMethod("method2", argumentTypes);
    m.invoke(a, "4", "5");
    argumentTypes[0] = String.class;
    argumentTypes[1] = String.class;
    m = A.class.getDeclaredMethod("method2", (Class<?>[]) argumentTypes);
    m.invoke(a, "5", "4");
    argumentTypes[0] = String.class;
    argumentTypes[1] = String.class;
    m = A.class.getDeclaredMethod("method2", (Class<?>[]) (Object[]) argumentTypes);
    m.invoke(a, "5", "4");

    argumentTypes[1] = int.class;
    argumentTypes[0] = int.class;
    m = A.class.getDeclaredMethod("method3", argumentTypes);
    m.invoke(a, 3, 3);
    argumentTypes[1] = int.class;
    argumentTypes[0] = int.class;
    m = A.class.getDeclaredMethod("method3", argumentTypes);
    m.invoke(a, 3, 4);

    try {
      argumentTypes = new Class<?>[2];
      argumentTypes[1] = int.class;
      argumentTypes[0] = int.class;
      argumentTypes[0] = String.class;
      argumentTypes[1] = String.class;
      m = A.class.getDeclaredMethod("method2", argumentTypes);
      m.invoke(a, "2", "3");
      argumentTypes[0] = String.class;
      argumentTypes[1] = String.class;
      m = A.class.getDeclaredMethod("method2", argumentTypes);
      m.invoke(a, "4", "7");

      argumentTypes[1] = int.class;
      argumentTypes[0] = int.class;
      m = A.class.getDeclaredMethod("method3", argumentTypes);
      m.invoke(a, 3, 3);
      argumentTypes[1] = int.class;
      argumentTypes[0] = int.class;
      m = A.class.getDeclaredMethod("method3", argumentTypes);
      m.invoke(a, 3, 4);
    } catch (Exception e) {
      System.out.println("Unexpected: " + e);
    }
  }
}

class MainNonConstArraySize {
  public static void main(String[] args) throws Exception {
    Method m;
    m = A.class.getMethod("method0");
    m.invoke(new A());

    nonConstArraySize(0);
  }

  @KeepConstantArguments
  @NeverInline
  static void nonConstArraySize(int argumentTypesSize) {
    try {
      A a = new A();

      Method m;
      Class<?>[] argumentTypes;
      argumentTypes = new Class<?>[argumentTypesSize];
      m = A.class.getDeclaredMethod("method0", argumentTypes);
      m.invoke(a);
    } catch (Exception e) {
      // Prepend the 0 output to the exception name to make it easier to compare the result with
      // the reference run.
      System.out.print("0" + e.getClass().getCanonicalName());
    }
  }
}

class MainPhiValue {
  public static void main(String[] args) throws Exception {
    Method m;
    m = A.class.getMethod("method0");
    m.invoke(new A());
    m = A.class.getMethod("method1", String.class);
    m.invoke(new A(), "1");

    try {
      arrayIsPhi(true);
      throw new Exception("Unexpected");
    } catch (NoSuchMethodException e) {
      // Expected.
    }

    try {
      elementIsPhi(true);
      throw new Exception("Unexpected");
    } catch (NoSuchMethodException e) {
      // Expected.
    }

    try {
      elementIsPhiButDeterministic(true, "");
      throw new Exception("Unexpected");
    } catch (NoSuchMethodException e) {
      // Expected.
    }
  }

  @NeverInline
  static void arrayIsPhi(boolean b) throws Exception {
    A a = new A();

    Method m;
    Class<?>[] argumentTypes;
    if (b) {
      argumentTypes = new Class<?>[1];
      argumentTypes[0] = String.class;
    } else {
      argumentTypes = new Class<?>[1];
      argumentTypes[0] = int.class;
    }
    m = A.class.getDeclaredMethod("method1", argumentTypes);
    m.invoke(a, "0");
  }

  @NeverInline
  static void elementIsPhi(boolean b) throws Exception {
    A a = new A();

    Class<?> x;
    x = b ? String.class : int.class;
    Method m;
    Class<?>[] argumentTypes = new Class<?>[1];
    argumentTypes[0] = x;
    m = A.class.getDeclaredMethod("method1", argumentTypes);
    m.invoke(a, "0");
  }

  @NeverInline
  static void elementIsPhiButDeterministic(boolean b, String arg) throws Exception {
    A a = new A();

    Class<?> x;
    x = b ? String.class : arg.getClass();
    Method m;
    Class<?>[] argumentTypes = new Class<?>[1];
    argumentTypes[0] = x;
    m = A.class.getDeclaredMethod("method1", argumentTypes);
    m.invoke(a, "0");
  }
}

class AllPrimitiveTypes {
  public void method(boolean b) {
    System.out.print(b);
  }

  public void method(byte b) {
    System.out.print(b);
  }

  public void method(char c) {
    System.out.print(c);
  }

  public void method(short s) {
    System.out.print(s);
  }

  public void method(int i) {
    System.out.print(i);
  }

  public void method(long l) {
    System.out.print(l);
  }

  public void method(float f) {
    System.out.print(f);
  }

  public void method(double d) {
    System.out.print(d);
  }
}

class MainAllPrimitiveTypes {

  public static void main(String[] args) throws Exception {
    AllPrimitiveTypes a = new AllPrimitiveTypes();

    Method m;
    Class<?>[] argumentTypes;
    argumentTypes = new Class<?>[1];
    argumentTypes[0] = boolean.class;
    m = AllPrimitiveTypes.class.getDeclaredMethod("method", argumentTypes);
    m.invoke(a, true);
    argumentTypes[0] = byte.class;
    m = AllPrimitiveTypes.class.getDeclaredMethod("method", argumentTypes);
    m.invoke(a, (byte) 0);
    argumentTypes[0] = char.class;
    m = AllPrimitiveTypes.class.getDeclaredMethod("method", argumentTypes);
    m.invoke(a, 'a');
    argumentTypes[0] = short.class;
    m = AllPrimitiveTypes.class.getDeclaredMethod("method", argumentTypes);
    m.invoke(a, (short) 1);
    argumentTypes[0] = int.class;
    m = AllPrimitiveTypes.class.getDeclaredMethod("method", argumentTypes);
    m.invoke(a, 2);
    argumentTypes[0] = long.class;
    m = AllPrimitiveTypes.class.getDeclaredMethod("method", argumentTypes);
    m.invoke(a, 3L);
    argumentTypes[0] = float.class;
    m = AllPrimitiveTypes.class.getDeclaredMethod("method", argumentTypes);
    m.invoke(a, 4.4f);
    argumentTypes[0] = double.class;
    m = AllPrimitiveTypes.class.getDeclaredMethod("method", argumentTypes);
    m.invoke(a, 5.5d);

    try {
      argumentTypes = new Class<?>[1];
      argumentTypes[0] = boolean.class;
      m = AllPrimitiveTypes.class.getDeclaredMethod("method", argumentTypes);
      m.invoke(a, true);
      argumentTypes[0] = byte.class;
      m = AllPrimitiveTypes.class.getDeclaredMethod("method", argumentTypes);
      m.invoke(a, (byte) 0);
      argumentTypes[0] = char.class;
      m = AllPrimitiveTypes.class.getDeclaredMethod("method", argumentTypes);
      m.invoke(a, 'a');
      argumentTypes[0] = short.class;
      m = AllPrimitiveTypes.class.getDeclaredMethod("method", argumentTypes);
      m.invoke(a, (short) 1);
      argumentTypes[0] = int.class;
      m = AllPrimitiveTypes.class.getDeclaredMethod("method", argumentTypes);
      m.invoke(a, 2);
      argumentTypes[0] = long.class;
      m = AllPrimitiveTypes.class.getDeclaredMethod("method", argumentTypes);
      m.invoke(a, 3L);
      argumentTypes[0] = float.class;
      m = AllPrimitiveTypes.class.getDeclaredMethod("method", argumentTypes);
      m.invoke(a, 4.4f);
      argumentTypes[0] = double.class;
      m = AllPrimitiveTypes.class.getDeclaredMethod("method", argumentTypes);
      m.invoke(a, 5.5d);
    } catch (Exception e) {
      System.out.println("Unexpected: " + e);
    }
  }
}

class AllBoxedTypes {
  public void method(Boolean b) {
    System.out.print(b);
  }

  public void method(Byte b) {
    System.out.print(b);
  }

  public void method(Character c) {
    System.out.print(c);
  }

  public void method(Short s) {
    System.out.print(s);
  }

  public void method(Integer i) {
    System.out.print(i);
  }

  public void method(Long l) {
    System.out.print(l);
  }

  public void method(Float f) {
    System.out.print(f);
  }

  public void method(Double d) {
    System.out.print(d);
  }
}

class MainAllBoxedTypes {

  public static void main(String[] args) throws Exception {
    AllBoxedTypes a = new AllBoxedTypes();

    Method m;
    Class<?>[] argumentTypes;
    argumentTypes = new Class<?>[1];
    argumentTypes[0] = Boolean.class;
    m = AllBoxedTypes.class.getDeclaredMethod("method", argumentTypes);
    m.invoke(a, true);
    argumentTypes[0] = Byte.class;
    m = AllBoxedTypes.class.getDeclaredMethod("method", argumentTypes);
    m.invoke(a, (byte) 0);
    argumentTypes[0] = Character.class;
    m = AllBoxedTypes.class.getDeclaredMethod("method", argumentTypes);
    m.invoke(a, 'a');
    argumentTypes[0] = Short.class;
    m = AllBoxedTypes.class.getDeclaredMethod("method", argumentTypes);
    m.invoke(a, (short) 1);
    argumentTypes[0] = Integer.class;
    m = AllBoxedTypes.class.getDeclaredMethod("method", argumentTypes);
    m.invoke(a, 2);
    argumentTypes[0] = Long.class;
    m = AllBoxedTypes.class.getDeclaredMethod("method", argumentTypes);
    m.invoke(a, 3L);
    argumentTypes[0] = Float.class;
    m = AllBoxedTypes.class.getDeclaredMethod("method", argumentTypes);
    m.invoke(a, 4.4f);
    argumentTypes[0] = Double.class;
    m = AllBoxedTypes.class.getDeclaredMethod("method", argumentTypes);
    m.invoke(a, 5.5d);

    try {
      argumentTypes = new Class<?>[1];
      argumentTypes[0] = Boolean.class;
      m = AllBoxedTypes.class.getDeclaredMethod("method", argumentTypes);
      m.invoke(a, true);
      argumentTypes[0] = Byte.class;
      m = AllBoxedTypes.class.getDeclaredMethod("method", argumentTypes);
      m.invoke(a, (byte) 0);
      argumentTypes[0] = Character.class;
      m = AllBoxedTypes.class.getDeclaredMethod("method", argumentTypes);
      m.invoke(a, 'a');
      argumentTypes[0] = Short.class;
      m = AllBoxedTypes.class.getDeclaredMethod("method", argumentTypes);
      m.invoke(a, (short) 1);
      argumentTypes[0] = Integer.class;
      m = AllBoxedTypes.class.getDeclaredMethod("method", argumentTypes);
      m.invoke(a, 2);
      argumentTypes[0] = Long.class;
      m = AllBoxedTypes.class.getDeclaredMethod("method", argumentTypes);
      m.invoke(a, 3L);
      argumentTypes[0] = Float.class;
      m = AllBoxedTypes.class.getDeclaredMethod("method", argumentTypes);
      m.invoke(a, 4.4f);
      argumentTypes[0] = Double.class;
      m = AllBoxedTypes.class.getDeclaredMethod("method", argumentTypes);
      m.invoke(a, 5.5d);
    } catch (Exception e) {
      System.out.println("Unexpected: " + e);
    }
  }
}

@RunWith(Parameterized.class)
public class ReflectionTest extends TestBase {

  private Backend backend;

  @Parameterized.Parameters(name = "Backend: {0}")
  public static Backend[] data() {
    return ToolHelper.getBackends();
  }

  public ReflectionTest(Backend backend) {
    this.backend = backend;
  }

  @Test
  public void test() throws Exception {
    Class<?> mainClass = MainTest.class;
    AndroidApp output =
        compileWithR8(
            readClasses(A.class, mainClass), keepMainProguardConfiguration(mainClass), backend);
    CodeInspector inspector = new CodeInspector(output);

    assertThat(
        inspector.clazz(A.class).method("void", "method0", ImmutableList.of()),
        isPresentAndRenamed());
    assertThat(
        inspector.clazz(A.class).method("void", "method1", ImmutableList.of("java.lang.String")),
        isPresentAndRenamed());
    assertThat(
        inspector
            .clazz(A.class)
            .method("void", "method2", ImmutableList.of("java.lang.String", "java.lang.String")),
        isPresentAndRenamed());

    assertEquals(runOnJava(mainClass), runOnVM(output, mainClass, backend));
  }

  @Test
  public void testNonConstArraySize() throws Exception {
    testForR8(backend)
        .addProgramClasses(MainNonConstArraySize.class, A.class)
        .addKeepMainRule(MainNonConstArraySize.class)
        .enableConstantArgumentAnnotations()
        .enableInliningAnnotations()
        .run(MainNonConstArraySize.class)
        .inspect(
            inspector -> {
              assertThat(
                  inspector.clazz(A.class).method("void", "method0", ImmutableList.of()),
                  isPresentAndRenamed());
            })
        // The reference run on the Java VM will succeed, whereas the run on the R8 output will fail
        // as in this test we fail to recognize the reflective call. To compare the output of the
        // successful reference run append "java.lang.NoSuchMethodException" to it.
        .assertSuccessWithOutput(
            runOnJava(MainNonConstArraySize.class) + "java.lang.NoSuchMethodException");
  }

  @Test
  public void testPhiValue() throws Exception {
    Class<?> mainClass = MainPhiValue.class;
    R8Command.Builder builder =
        ToolHelper.prepareR8CommandBuilder(
                readClasses(A.class, mainClass, NeverInline.class), emptyConsumer(backend))
            .addLibraryFiles(runtimeJar(backend));
    builder.addProguardConfiguration(
        ImmutableList.of(keepMainProguardConfigurationWithInliningAnnotation(mainClass)),
        Origin.unknown());
    ToolHelper.allowTestProguardOptions(builder);
    AndroidApp output = ToolHelper.runR8(builder.build(), o -> o.enableInlining = false);

    runOnVM(output, mainClass, backend);
  }

  @Test
  public void testAllPrimitiveTypes() throws Exception {
    Class<?> mainClass = MainAllPrimitiveTypes.class;
    AndroidApp output =
        compileWithR8(
            readClasses(AllPrimitiveTypes.class, mainClass),
            keepMainProguardConfiguration(mainClass),
            backend);

    new CodeInspector(output)
        .clazz(AllPrimitiveTypes.class)
        .forAllMethods(
            m -> {
              if (!m.isInstanceInitializer()) {
                assertThat(m, isPresentAndRenamed());
              }
            });

    assertEquals(runOnJava(mainClass), runOnVM(output, mainClass, backend));
  }

  @Test
  public void testAllBoxedTypes() throws Exception {
    Class<?> mainClass = MainAllBoxedTypes.class;
    AndroidApp output =
        compileWithR8(
            readClasses(AllBoxedTypes.class, mainClass),
            keepMainProguardConfiguration(mainClass),
            backend);

    new CodeInspector(output)
        .clazz(AllBoxedTypes.class)
        .forAllMethods(
            m -> {
              if (!m.isInstanceInitializer()) {
                assertThat(m, isPresentAndRenamed());
              }
            });

    assertEquals(runOnJava(mainClass), runOnVM(output, mainClass, backend));
  }
}