// Copyright (c) 2022, 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.startup.utils;

import static com.android.tools.r8.TestBase.transformer;
import static org.junit.Assert.assertTrue;

import com.android.tools.r8.CompilationFailedException;
import com.android.tools.r8.D8TestBuilder;
import com.android.tools.r8.D8TestRunResult;
import com.android.tools.r8.TestBase;
import com.android.tools.r8.TestCompilerBuilder;
import com.android.tools.r8.TestDiagnosticMessagesImpl;
import com.android.tools.r8.TestParameters;
import com.android.tools.r8.TextInputStream;
import com.android.tools.r8.ThrowableConsumer;
import com.android.tools.r8.errors.Unreachable;
import com.android.tools.r8.experimental.startup.instrumentation.StartupInstrumentationOptions;
import com.android.tools.r8.origin.Origin;
import com.android.tools.r8.profile.art.ArtProfileBuilder;
import com.android.tools.r8.profile.art.ArtProfileBuilderUtils;
import com.android.tools.r8.profile.art.HumanReadableArtProfileParser;
import com.android.tools.r8.profile.art.HumanReadableArtProfileParserBuilder;
import com.android.tools.r8.startup.StartupClassBuilder;
import com.android.tools.r8.startup.StartupMethodBuilder;
import com.android.tools.r8.startup.StartupProfileBuilder;
import com.android.tools.r8.startup.StartupProfileProvider;
import com.android.tools.r8.startup.profile.ExternalStartupClass;
import com.android.tools.r8.startup.profile.ExternalStartupItem;
import com.android.tools.r8.startup.profile.ExternalStartupMethod;
import com.android.tools.r8.utils.AndroidApiLevel;
import com.android.tools.r8.utils.Reporter;
import com.android.tools.r8.utils.StringUtils;
import com.android.tools.r8.utils.ThrowingConsumer;
import com.android.tools.r8.utils.UTF8TextInputStream;
import java.io.IOException;
import java.nio.file.Path;
import java.util.Collection;
import java.util.function.Consumer;
import org.junit.rules.TemporaryFolder;

public class StartupTestingUtils {

  private static String startupInstrumentationTag = "startup";

  private static ArtProfileBuilder createStartupItemFactory(
      Consumer<ExternalStartupItem> startupItemConsumer) {
    StartupProfileBuilder startupProfileBuilder =
        new StartupProfileBuilder() {
          @Override
          public StartupProfileBuilder addStartupClass(
              Consumer<StartupClassBuilder> startupClassBuilderConsumer) {
            ExternalStartupClass.Builder startupClassBuilder = ExternalStartupClass.builder();
            startupClassBuilderConsumer.accept(startupClassBuilder);
            startupItemConsumer.accept(startupClassBuilder.build());
            return this;
          }

          @Override
          public StartupProfileBuilder addStartupMethod(
              Consumer<StartupMethodBuilder> startupMethodBuilderConsumer) {
            ExternalStartupMethod.Builder startupMethodBuilder = ExternalStartupMethod.builder();
            startupMethodBuilderConsumer.accept(startupMethodBuilder);
            startupItemConsumer.accept(startupMethodBuilder.build());
            return this;
          }

          @Override
          public StartupProfileBuilder addHumanReadableArtProfile(
              TextInputStream textInputStream,
              Consumer<HumanReadableArtProfileParserBuilder> parserBuilderConsumer) {
            // The ART profile parser never calls addHumanReadableArtProfile().
            throw new Unreachable();
          }
        };
    return ArtProfileBuilderUtils.createBuilderForArtProfileToStartupProfileConversion(
        startupProfileBuilder);
  }

  public static ThrowableConsumer<D8TestBuilder>
      enableStartupInstrumentationForOriginalAppUsingFile(TestParameters parameters) {
    return testBuilder -> enableStartupInstrumentation(testBuilder, parameters, false);
  }

  public static ThrowableConsumer<D8TestBuilder>
      enableStartupInstrumentationForOriginalAppUsingLogcat(TestParameters parameters) {
    return testBuilder -> enableStartupInstrumentation(testBuilder, parameters, true);
  }

  public static ThrowableConsumer<D8TestBuilder>
      enableStartupInstrumentationForOptimizedAppUsingLogcat(TestParameters parameters) {
    return testBuilder -> enableStartupInstrumentation(testBuilder, parameters, true);
  }

  private static void enableStartupInstrumentation(
      D8TestBuilder testBuilder, TestParameters parameters, boolean logcat) throws IOException {
    testBuilder
        .addOptionsModification(
            options -> {
              StartupInstrumentationOptions startupInstrumentationOptions =
                  options.getStartupInstrumentationOptions().setEnableStartupInstrumentation();
              if (logcat) {
                startupInstrumentationOptions.setStartupInstrumentationTag(
                    startupInstrumentationTag);
              }
            })
        .addLibraryFiles(parameters.getDefaultRuntimeLibrary())
        .addLibraryClassFileData(getTransformedAndroidUtilLog());
  }

  public static Path getAndroidUtilLog(TemporaryFolder temporaryFolder)
      throws CompilationFailedException, IOException {
    return TestBase.testForD8(temporaryFolder)
        .addProgramClassFileData(getTransformedAndroidUtilLog())
        .setMinApi(AndroidApiLevel.B)
        .compile()
        .writeToZip();
  }

  public static void readStartupListFromFile(
      Path path, Consumer<ExternalStartupItem> startupItemConsumer) throws IOException {
    TestDiagnosticMessagesImpl diagnostics = new TestDiagnosticMessagesImpl();
    HumanReadableArtProfileParser parser =
        HumanReadableArtProfileParser.builder()
            .setReporter(new Reporter(diagnostics))
            .setProfileBuilder(createStartupItemFactory(startupItemConsumer))
            .build();
    parser.parse(new UTF8TextInputStream(path), Origin.unknown());
    diagnostics.assertNoMessages();
  }

  public static ThrowingConsumer<D8TestRunResult, RuntimeException> removeStartupListFromStdout(
      Consumer<ExternalStartupItem> startupItemConsumer) {
    return runResult -> removeStartupListFromStdout(runResult, startupItemConsumer);
  }

  public static void removeStartupListFromStdout(
      D8TestRunResult runResult, Consumer<ExternalStartupItem> startupItemConsumer) {
    TestDiagnosticMessagesImpl diagnostics = new TestDiagnosticMessagesImpl();
    HumanReadableArtProfileParser parser =
        HumanReadableArtProfileParser.builder()
            .setReporter(new Reporter(diagnostics))
            .setProfileBuilder(createStartupItemFactory(startupItemConsumer))
            .build();
    StringBuilder stdoutBuilder = new StringBuilder();
    String startupDescriptorPrefix = "[" + startupInstrumentationTag + "] ";
    for (String line : StringUtils.splitLines(runResult.getStdOut(), true)) {
      if (line.startsWith(startupDescriptorPrefix)) {
        String message = line.substring(startupDescriptorPrefix.length());
        assertTrue(parser.parseRule(message));
      } else {
        stdoutBuilder.append(line).append(System.lineSeparator());
      }
    }
    diagnostics.assertNoMessages();
    runResult.getResult().setStdout(stdoutBuilder.toString());
  }

  public static void setStartupConfiguration(
      TestCompilerBuilder<?, ?, ?, ?, ?> testBuilder,
      Collection<ExternalStartupItem> startupItems) {
    StartupProfileProvider startupProfileProvider =
        new StartupProfileProvider() {
          @Override
          public void getStartupProfile(StartupProfileBuilder startupProfileBuilder) {
            for (ExternalStartupItem startupItem : startupItems) {
              startupItem.apply(
                  startupClass ->
                      startupProfileBuilder.addStartupClass(
                          startupClassBuilder ->
                              startupClassBuilder.setClassReference(startupClass.getReference())),
                  startupMethod ->
                      startupProfileBuilder.addStartupMethod(
                          startupMethodBuilder ->
                              startupMethodBuilder.setMethodReference(
                                  startupMethod.getReference())));
            }
          }

          @Override
          public Origin getOrigin() {
            return Origin.unknown();
          }
        };
    if (testBuilder.isD8TestBuilder()) {
      testBuilder.asD8TestBuilder().addStartupProfileProviders(startupProfileProvider);
    } else {
      assertTrue(testBuilder.isR8TestBuilder());
      testBuilder.asR8TestBuilder().addStartupProfileProviders(startupProfileProvider);
    }
  }

  private static byte[] getTransformedAndroidUtilLog() throws IOException {
    return transformer(Log.class).setClassDescriptor("Landroid/util/Log;").transform();
  }

  public static class Log {

    public static int i(String tag, String msg) {
      System.out.println("[" + tag + "] " + msg);
      return 42;
    }
  }
}