// Copyright (c) 2019, 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.kotlin;

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

import com.android.tools.r8.ToolHelper.KotlinTargetVersion;
import com.android.tools.r8.utils.BooleanUtils;
import com.android.tools.r8.utils.InternalOptions;
import com.android.tools.r8.utils.codeinspector.CodeInspector;
import com.android.tools.r8.utils.codeinspector.MethodSubject;
import com.google.common.collect.ImmutableList;
import java.util.Collection;
import java.util.function.Consumer;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;

@RunWith(Parameterized.class)
public class KotlinUnusedArgumentsInLambdasTest extends AbstractR8KotlinTestBase {

  @Parameterized.Parameters(name = "target: {0}, allowAccessModification: {1}")
  public static Collection<Object[]> data() {
    return buildParameters(KotlinTargetVersion.values(), BooleanUtils.values());
  }

  private Consumer<InternalOptions> optionsModifier =
    o -> {
      o.enableInlining = true;
      o.enableLambdaMerging = true;
      o.enableArgumentRemoval = true;
      o.enableUnusedArgumentRemoval = true;
    };

  public KotlinUnusedArgumentsInLambdasTest(
      KotlinTargetVersion targetVersion, boolean allowAccessModification) {
    super(targetVersion, allowAccessModification);
  }

  @Test
  public void testMergingKStyleLambdasAfterUnusedArgumentRemoval() throws Exception {
    final String mainClassName = "unused_arg_in_lambdas_kstyle.MainKt";
    runTest("unused_arg_in_lambdas_kstyle", mainClassName, optionsModifier, app -> {
      CodeInspector inspector = new CodeInspector(app);
      inspector.forAllClasses(classSubject -> {
        if (classSubject.getOriginalDescriptor().contains("$ks")) {
          MethodSubject init = classSubject.init(ImmutableList.of("int"));
          assertThat(init, isPresent());
          // Arity 2 should appear.
          assertTrue(init.iterateInstructions(i -> i.isConstNumber(2)).hasNext());

          MethodSubject invoke = classSubject.uniqueMethodWithName("invoke");
          assertThat(invoke, isPresent());
          assertEquals(2, invoke.getMethod().method.proto.parameters.size());
        }
      });
    });
  }

  @Test
  public void testMergingJStyleLambdasAfterUnusedArgumentRemoval() throws Exception {
    final String mainClassName = "unused_arg_in_lambdas_jstyle.MainKt";
    runTest("unused_arg_in_lambdas_jstyle", mainClassName, optionsModifier, app -> {
      CodeInspector inspector = new CodeInspector(app);
      inspector.forAllClasses(classSubject -> {
        if (classSubject.getOriginalDescriptor().contains("$js")) {
          MethodSubject get = classSubject.uniqueMethodWithName("get");
          assertThat(get, isPresent());
          assertEquals(3, get.getMethod().method.proto.parameters.size());
        }
      });
    });
  }
}