// Copyright (c) 2016, 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.internal;

import com.android.tools.r8.CompilationException;
import com.android.tools.r8.CompilationFailedException;
import com.android.tools.r8.DexIndexedConsumer;
import com.android.tools.r8.OutputMode;
import com.android.tools.r8.R8Command;
import com.android.tools.r8.ToolHelper;
import com.android.tools.r8.graph.DexEncodedMethod;
import com.android.tools.r8.shaking.ProguardRuleParserException;
import com.android.tools.r8.utils.AndroidApiLevel;
import com.android.tools.r8.utils.AndroidApp;
import com.beust.jcommander.internal.Lists;
import java.io.IOException;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.ExecutionException;
import org.junit.Test;

public class R8GMSCoreDeterministicTest extends GMSCoreCompilationTestBase {

  public Set<DexEncodedMethod> shuffle(Set<DexEncodedMethod> methods) {
    List<DexEncodedMethod> toShuffle = Lists.newArrayList(methods);
    Collections.shuffle(toShuffle);
    return new LinkedHashSet<>(toShuffle);
  }

  private AndroidApp doRun()
      throws IOException, ProguardRuleParserException, CompilationException, ExecutionException,
      CompilationFailedException {
    R8Command command =
        R8Command.builder()
            .addProgramFiles(Paths.get(GMSCORE_V7_DIR, GMSCORE_APK))
            .setProgramConsumer(DexIndexedConsumer.emptyConsumer())
            .setMinApiLevel(AndroidApiLevel.L.getLevel())
            .build();
    return ToolHelper.runR8(
        command,
        options -> {
          // For this test just do random shuffle.
          options.testing.irOrdering = this::shuffle;
          // Only use one thread to process to process in the order decided by the callback.
          options.numberOfThreads = 1;
          // Ignore the missing classes.
          options.ignoreMissingClasses = true;
        });
  }

  @Test
  public void deterministic() throws Exception {

    // Run two independent compilations.
    AndroidApp app1 = doRun();
    AndroidApp app2 = doRun();

    // Check that the generated bytecode runs through the dex2oat verifier with no errors.
    Path combinedInput = temp.getRoot().toPath().resolve("all.jar");
    Path oatFile = temp.getRoot().toPath().resolve("all.oat");
    app1.writeToZip(combinedInput, OutputMode.DexIndexed);
    ToolHelper.runDex2Oat(combinedInput, oatFile);

    // Verify that the result of the two compilations was the same.
    assertIdenticalApplications(app1, app2);
  }
}