// Copyright (c) 2020, 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.classmerging.horizontal;

import static com.android.tools.r8.utils.codeinspector.Matchers.isPresent;
import static com.android.tools.r8.utils.codeinspector.Matchers.readsInstanceField;
import static com.android.tools.r8.utils.codeinspector.Matchers.writesInstanceField;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.core.IsNot.not;

import com.android.tools.r8.NeverClassInline;
import com.android.tools.r8.NeverInline;
import com.android.tools.r8.NoHorizontalClassMerging;
import com.android.tools.r8.TestParameters;
import com.android.tools.r8.horizontalclassmerging.ClassMerger;
import com.android.tools.r8.utils.codeinspector.ClassSubject;
import com.android.tools.r8.utils.codeinspector.FieldSubject;
import com.android.tools.r8.utils.codeinspector.MethodSubject;
import org.junit.Test;

public class ConstructorMergingPreoptimizedTest extends HorizontalClassMergingTestBase {

  public ConstructorMergingPreoptimizedTest(
      TestParameters parameters, boolean enableHorizontalClassMerging) {
    super(parameters, enableHorizontalClassMerging);
  }

  @Test
  public void testR8() throws Exception {
    testForR8(parameters.getBackend())
        .addInnerClasses(getClass())
        .addKeepMainRule(Main.class)
        .addOptionsModification(
            options ->
                options.horizontalClassMergerOptions().enableIf(enableHorizontalClassMerging))
        .addHorizontallyMergedClassesInspectorIf(
            enableHorizontalClassMerging,
            inspector ->
                inspector.assertMerged(A.class, B.class).assertMergedIntoDifferentType(B.class))
        .enableInliningAnnotations()
        .enableNeverClassInliningAnnotations()
        .enableNoHorizontalClassMergingAnnotations()
        .setMinApi(parameters.getApiLevel())
        .run(parameters.getRuntime(), Main.class)
        .assertSuccessWithOutputLines(
            "changed", "13", "42", "foo", "7", "foo", "print a", "print b")
        .inspect(
            codeInspector -> {
              if (enableHorizontalClassMerging) {
                ClassSubject changedClassSubject = codeInspector.clazz(Changed.class);
                assertThat(changedClassSubject, isPresent());

                ClassSubject aClassSubject = codeInspector.clazz(A.class);
                assertThat(aClassSubject, isPresent());
                FieldSubject classIdFieldSubject =
                    aClassSubject.uniqueFieldWithName(ClassMerger.CLASS_ID_FIELD_NAME);
                assertThat(classIdFieldSubject, isPresent());

                MethodSubject firstInitSubject = aClassSubject.init("int");
                assertThat(firstInitSubject, isPresent());
                assertThat(
                    firstInitSubject, writesInstanceField(classIdFieldSubject.getDexField()));

                MethodSubject otherInitSubject =
                    aClassSubject.init(changedClassSubject.getFinalName(), "int");
                assertThat(otherInitSubject, isPresent());
                assertThat(
                    otherInitSubject, writesInstanceField(classIdFieldSubject.getDexField()));

                MethodSubject printSubject = aClassSubject.method("void", "print$bridge");
                assertThat(printSubject, isPresent());
                assertThat(printSubject, readsInstanceField(classIdFieldSubject.getDexField()));

                assertThat(codeInspector.clazz(B.class), not(isPresent()));

                // TODO(b/165517236): Explicitly check classes have been merged.
              } else {
                assertThat(codeInspector.clazz(A.class), isPresent());
                assertThat(codeInspector.clazz(B.class), isPresent());
              }
            });
  }

  @NeverClassInline
  @NoHorizontalClassMerging
  public static class Parent {
    @NeverInline
    public void foo() {
      System.out.println("foo");
    }
  }

  @NeverClassInline
  @NoHorizontalClassMerging
  public static class Changed extends Parent {
    public Changed() {
      System.out.println("changed");
    }
  }

  @NeverClassInline
  public static class A {
    public A(Parent p) {
      System.out.println(42);
      p.foo();
    }

    public A(int x) {
      System.out.println(x);
    }

    @NeverInline
    public void print() {
      System.out.println("print a");
    }
  }

  @NeverClassInline
  public static class B {
    public B(Parent p) {
      System.out.println(7);
      p.foo();
    }

    @NeverInline
    public void print() {
      System.out.println("print b");
    }
  }

  public static class Main {
    public static void main(String[] args) {
      Parent p = new Changed();
      A a = new A(13);
      a = new A(p);
      B b = new B(p);
      a.print();
      b.print();
    }
  }
}