// 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;

import static org.junit.Assert.assertEquals;
import static org.junit.Assume.assumeTrue;

import com.android.tools.r8.ByteDataView;
import com.android.tools.r8.ClassFileConsumer.ArchiveConsumer;
import com.android.tools.r8.TestBase;
import com.android.tools.r8.TestParameters;
import com.android.tools.r8.TestParametersCollection;
import com.android.tools.r8.ToolHelper;
import com.android.tools.r8.ToolHelper.ProcessResult;
import com.android.tools.r8.utils.DescriptorUtils;
import com.android.tools.r8.utils.FileUtils;
import com.android.tools.r8.utils.StringUtils;
import java.io.IOException;
import java.nio.file.Path;
import org.junit.Before;
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 InstantiatedLambdasTestRunner extends TestBase {

  static final Class<?> CLASS = InstantiatedLambdasTest.class;
  static final Class<?>[] CLASSES = InstantiatedLambdasTest.CLASSES;
  static final String EXPECTED = StringUtils.lines("Class implementation", "Lambda implementation");

  private final TestParameters parameters;

  private Path inputJar;

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

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

  @Before
  public void writeAndRunInputJar() throws IOException {
    inputJar = temp.getRoot().toPath().resolve("input.jar");
    ArchiveConsumer buildInput = new ArchiveConsumer(inputJar);
    for (Class<?> clazz : CLASSES) {
      buildInput.accept(
          ByteDataView.of(ToolHelper.getClassAsBytes(clazz)),
          DescriptorUtils.javaTypeToDescriptor(clazz.getName()),
          null);
    }
    buildInput.finished(null);
  }

  @Test
  public void testProguard() throws Exception {
    assumeTrue(parameters.isCfRuntime());
    buildAndRunProguard("pg.jar", false);
  }

  @Test
  public void testR8() throws Exception {
    testForR8(parameters.getBackend())
        .addProgramFiles(inputJar)
        .addKeepMainRule(CLASS)
        .debug()
        .setMinApi(parameters)
        .compile()
        .apply(
            compileResult ->
                compileResult.run(parameters.getRuntime(), CLASS).assertSuccessWithOutput(EXPECTED))
        .applyIf(
            parameters.isDexRuntime(),
            compileResult ->
                compileResult.runDex2Oat(parameters.getRuntime()).assertNoVerificationErrors());
  }

  private void buildAndRunProguard(String outName, boolean aggressive) throws Exception {
    Path pgConfig = writeProguardRules(aggressive);
    Path outPg = temp.getRoot().toPath().resolve(outName);
    ProcessResult proguardResult =
        ToolHelper.runProguard6Raw(
            inputJar, outPg, ToolHelper.getJava8RuntimeJar(), pgConfig, null);
    System.out.println(proguardResult.stdout);
    if (proguardResult.exitCode != 0) {
      System.out.println(proguardResult.stderr);
    }
    assertEquals(0, proguardResult.exitCode);
    ProcessResult runPg = ToolHelper.runJava(outPg, CLASS.getCanonicalName());
    assertEquals(0, runPg.exitCode);
  }

  private Path writeProguardRules(boolean aggressive) throws IOException {
    Path pgConfig = temp.getRoot().toPath().resolve("keep.txt");
    FileUtils.writeTextFile(
        pgConfig,
        "-keep public class " + CLASS.getCanonicalName() + " {",
        "  public static void main(...);",
        "}",
        aggressive ? "-overloadaggressively" : "# Not overloading aggressively");
    return pgConfig;
  }
}