// 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.shaking.examples;

import com.android.tools.r8.TestBase.MinifyMode;
import com.android.tools.r8.shaking.TreeShakingTest;
import com.android.tools.r8.utils.codeinspector.ClassSubject;
import com.android.tools.r8.utils.codeinspector.CodeInspector;
import com.android.tools.r8.utils.codeinspector.FieldAccessInstructionSubject;
import com.android.tools.r8.utils.codeinspector.InstructionSubject;
import com.android.tools.r8.utils.codeinspector.MethodSubject;
import com.google.common.collect.ImmutableList;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;

@RunWith(Parameterized.class)
public class TreeShaking13Test extends TreeShakingTest {

  @Parameters(name = "mode:{0}-{1} minify:{2}")
  public static Collection<Object[]> data() {
    List<Object[]> parameters = new ArrayList<>();
    for (MinifyMode minify : MinifyMode.values()) {
      parameters.add(new Object[] {Frontend.JAR, Backend.CF, minify});
      parameters.add(new Object[] {Frontend.JAR, Backend.DEX, minify});
      parameters.add(new Object[] {Frontend.DEX, Backend.DEX, minify});
    }
    return parameters;
  }

  public TreeShaking13Test(Frontend frontend, Backend backend, MinifyMode minify) {
    super("examples/shaking13", "shaking13.Shaking", frontend, backend, minify);
  }

  @Test
  public void test() throws Exception {
    runTest(
        TreeShaking13Test::shaking13EnsureFieldWritesCorrect,
        null,
        null,
        ImmutableList.of("src/test/examples/shaking13/keep-rules.txt"));
  }

  private static void shaking13EnsureFieldWritesCorrect(CodeInspector inspector) {
    ClassSubject mainClass = inspector.clazz("shaking13.Shaking");
    MethodSubject testMethod = mainClass.method("void", "fieldTest", Collections.emptyList());
    Assert.assertTrue(testMethod.isPresent());
    if (testMethod.getMethod().getCode().isJarCode()) {
      // TODO(mathiasr): Implement iterateInstructions() for JarCode/CfCode
      return;
    }
    Iterator<FieldAccessInstructionSubject> iterator =
        testMethod.iterateInstructions(InstructionSubject::isFieldAccess);
    Assert.assertTrue(iterator.hasNext() && iterator.next().holder().is("shakinglib.LibraryClass"));
    Assert.assertTrue(iterator.hasNext() && iterator.next().holder().is("shakinglib.LibraryClass"));
    Assert.assertFalse(iterator.hasNext());
  }
}