// 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.desugar.nestaccesscontrol;

import static com.android.tools.r8.utils.FileUtils.JAR_EXTENSION;
import static junit.framework.TestCase.assertEquals;
import static junit.framework.TestCase.assertTrue;

import com.android.tools.r8.TestBase;
import com.android.tools.r8.TestParameters;
import com.android.tools.r8.TestParametersCollection;
import com.android.tools.r8.TestRuntime;
import com.android.tools.r8.TestRuntime.CfVm;
import com.android.tools.r8.ToolHelper;
import com.android.tools.r8.cf.bootstrap.BootstrapCurrentEqualityTest;
import com.android.tools.r8.utils.codeinspector.CodeInspector;
import com.google.common.collect.ImmutableList;
import java.nio.file.Path;
import java.nio.file.Paths;
import org.junit.Assume;
import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;

/**
 * This test relies on a freshly built build/libs/r8_with_relocated_deps_11.jar.
 *
 * <p>The test compiles Hello/R8 with the same settings using R8 compiled with Java 11 (non shrunk),
 * and the same but shrunk with/without nest desugaring. All generated jars should be run correctly
 * and identical.
 */
@RunWith(Parameterized.class)
public class Java11R8BootstrapTest extends TestBase {

  private static final Path MAIN_KEEP = Paths.get("src/main/keep.txt");
  private static final String[] HELLO_KEEP = {
    "-keep class hello.Hello {  public static void main(...);}"
  };

  private static Path r8Lib11NoDesugar;
  private static Path r8Lib11Desugar;

  public Java11R8BootstrapTest(TestParameters parameters) {
    this.parameters = parameters;
  }

  private final TestParameters parameters;

  @Parameters(name = "{0}")
  public static TestParametersCollection data() {
    return getTestParameters().withCfRuntimes().build();
  }

  @BeforeClass
  public static void beforeAll() throws Exception {
    r8Lib11NoDesugar = compileR8(false);
    r8Lib11Desugar = compileR8(true);
  }

  private static Path compileR8(boolean desugar) throws Exception {
    // Shrink R8 11 with R8
    return testForR8(TestBase.getStaticTemp(), Backend.CF)
        .addProgramFiles(ToolHelper.R8_WITH_RELOCATED_DEPS_11_JAR)
        .addKeepRuleFiles(MAIN_KEEP)
        .addOptionsModification(
            options -> options.testing.enableForceNestBasedAccessDesugaringForTest = desugar)
        .compile()
        .inspect(inspector -> assertNests(inspector, desugar))
        .writeToZip();
  }

  private static void assertNests(CodeInspector inspector, boolean desugar) {
    if (desugar) {
      assertTrue(
          inspector.allClasses().stream().noneMatch(subj -> subj.getDexProgramClass().isInANest()));
    } else {
      assertTrue(
          inspector.allClasses().stream().anyMatch(subj -> subj.getDexProgramClass().isInANest()));
    }
  }

  private Path[] jarsToCompare() {
    return new Path[] {
      ToolHelper.R8_WITH_RELOCATED_DEPS_JAR,
      ToolHelper.R8_WITH_RELOCATED_DEPS_11_JAR,
      r8Lib11NoDesugar,
      r8Lib11Desugar
    };
  }

  @Test
  public void testHello() throws Exception {
    Assume.assumeTrue(!ToolHelper.isWindows());
    Path prevGeneratedJar = null;
    String prevRunResult = null;
    for (Path jar : jarsToCompare()) {
      // All jars except ToolHelper.R8_WITH_RELOCATED_DEPS_JAR are compiled for JDK11.
      TestRuntime runtime =
          jar == ToolHelper.R8_WITH_RELOCATED_DEPS_JAR
              ? parameters.getRuntime()
              : TestRuntime.getCheckedInJdk11();
      Path generatedJar =
          testForExternalR8(Backend.CF, runtime)
              .useProvidedR8(jar)
              .addProgramFiles(Paths.get(ToolHelper.EXAMPLES_BUILD_DIR, "hello" + JAR_EXTENSION))
              .addKeepRules(HELLO_KEEP)
              .compile()
              .outputJar();
      String runResult =
          ToolHelper.runJava(
                  parameters.getRuntime().asCf(), ImmutableList.of(generatedJar), "hello.Hello")
              .toString();
      if (prevRunResult != null) {
        assertEquals(prevRunResult, runResult);
      }
      prevRunResult = runResult;
      if (prevGeneratedJar != null) {
        BootstrapCurrentEqualityTest.assertProgramsEqual(prevGeneratedJar, generatedJar);
      }
      prevGeneratedJar = generatedJar;
    }
  }

  @Test
  public void testR8() throws Exception {
    Assume.assumeTrue(!ToolHelper.isWindows());
    Assume.assumeTrue(parameters.isCfRuntime());
    Assume.assumeTrue(CfVm.JDK11 == parameters.getRuntime().asCf().getVm());
    Path prevGeneratedJar = null;
    for (Path jar : jarsToCompare()) {
      Path generatedJar =
          testForExternalR8(Backend.CF, parameters.getRuntime())
              .useProvidedR8(jar)
              .addProgramFiles(Paths.get(ToolHelper.EXAMPLES_BUILD_DIR, "hello" + JAR_EXTENSION))
              .addKeepRuleFiles(MAIN_KEEP)
              .compile()
              .outputJar();
      if (prevGeneratedJar != null) {
        BootstrapCurrentEqualityTest.assertProgramsEqual(prevGeneratedJar, generatedJar);
      }
      prevGeneratedJar = generatedJar;
    }
  }
}