// Copyright (c) 2017, 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.compatdx;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotEquals;
import static org.junit.Assert.assertTrue;

import com.android.tools.r8.ToolHelper;
import com.android.tools.r8.ToolHelper.ProcessResult;
import com.android.tools.r8.dex.Constants;
import com.android.tools.r8.utils.FileUtils;
import com.android.tools.r8.utils.StringUtils;
import com.android.tools.r8.utils.StringUtils.BraceType;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import java.io.IOException;
import java.net.URI;
import java.nio.charset.StandardCharsets;
import java.nio.file.FileSystem;
import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
import java.nio.file.StandardOpenOption;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TemporaryFolder;

public class CompatDxTests {
  private static final int MAX_METHOD_COUNT = Constants.U16BIT_MAX;

  private static final String EXAMPLE_JAR_FILE1 = ToolHelper.EXAMPLES_BUILD_DIR + "arithmetic.jar";
  private static final String EXAMPLE_JAR_FILE2 = ToolHelper.EXAMPLES_BUILD_DIR + "barray.jar";

  private static final String NO_LOCALS = "--no-locals";
  private static final String NO_POSITIONS = "--positions=none";
  private static final String MULTIDEX = "--multi-dex";
  private static final String NUM_THREADS_5 = "--num-threads=5";

  @Rule
  public TemporaryFolder temp = ToolHelper.getTemporaryFolderForTest();

  @Test
  public void noFilesTest() throws IOException {
    runDexer("--no-files");
  }

  @Test
  public void noOutputTest() throws IOException {
    runDexerWithoutOutput(NO_POSITIONS, NO_LOCALS, MULTIDEX, EXAMPLE_JAR_FILE1);
  }

  @Test
  public void singleJarInputFile() throws IOException {
    runDexer(NO_POSITIONS, NO_LOCALS, MULTIDEX, EXAMPLE_JAR_FILE1);
  }

  @Test
  public void multipleJarInputFiles() throws IOException {
    runDexer(NO_POSITIONS, NO_LOCALS, MULTIDEX, EXAMPLE_JAR_FILE1, EXAMPLE_JAR_FILE2);
  }

  @Test
  public void outputZipFile() throws IOException {
    runDexerWithOutput("foo.dex.zip", NO_POSITIONS, NO_LOCALS, MULTIDEX, EXAMPLE_JAR_FILE1);
  }

  @Test
  public void useMultipleThreads() throws IOException {
    runDexer(NUM_THREADS_5, NO_POSITIONS, NO_LOCALS, EXAMPLE_JAR_FILE1);
  }

  @Test
  public void withPositions() throws IOException {
    runDexer(NO_LOCALS, MULTIDEX, EXAMPLE_JAR_FILE1);
  }

  @Test
  public void withLocals() throws IOException {
    runDexer(NO_POSITIONS, MULTIDEX, EXAMPLE_JAR_FILE1);
  }

  @Test
  public void withoutMultidex() throws IOException {
    runDexer(NO_POSITIONS, NO_LOCALS, EXAMPLE_JAR_FILE1);
  }

  @Test
  public void writeToNamedDexFile() throws IOException {
    runDexerWithOutput("named-output.dex", EXAMPLE_JAR_FILE1);
  }

  @Test
  public void keepClassesSingleDexTest() throws IOException {
    runDexerWithOutput("out.zip", "--keep-classes", EXAMPLE_JAR_FILE1);
  }

  @Test
  public void keepClassesMultiDexTest() throws IOException {
    runDexerWithOutput("out.zip", "--keep-classes", "--multi-dex", EXAMPLE_JAR_FILE1);
  }

  @Test
  public void ignoreDexInArchiveTest() throws IOException {
    // Create a JAR with both a .class and a .dex file (the .dex file is just empty).
    Path jarWithClassesAndDex = temp.newFile("test.jar").toPath();
    Files.copy(Paths.get(EXAMPLE_JAR_FILE1), jarWithClassesAndDex,
        StandardCopyOption.REPLACE_EXISTING);
    URI uri = URI.create("jar:" + jarWithClassesAndDex.toUri());
    FileSystem fileSystem = FileSystems.newFileSystem(uri, ImmutableMap.of("create", "true"));
    Path dexFile = fileSystem.getPath("classes.dex");
    Files.newOutputStream(dexFile, StandardOpenOption.CREATE).close();
    fileSystem.close();

    // Only test this with CompatDx, as dx does not like the empty .dex file.
    List<String> d8Args =ImmutableList.of(
        "--output=" + temp.newFolder("out").toString(), jarWithClassesAndDex.toString());
    CompatDx.main(d8Args.toArray(new String[d8Args.size()]));
  }

  private void runDexer(String... args) throws IOException {
    runDexerWithOutput("", args);
  }

  private void runDexerWithoutOutput(String... args) throws IOException {
    runDexerWithOutput(null, args);
  }

  private Path getOutputD8() {
    return temp.getRoot().toPath().resolve("d8-out");
  }

  private Path getOutputDX() {
    return temp.getRoot().toPath().resolve("dx-out");
  }

  private void runDexerWithOutput(String out, String... args) throws IOException {
    Path d8Out = null;
    Path dxOut = null;
    if (out != null) {
      Path baseD8 = getOutputD8();
      Path baseDX = getOutputDX();
      Files.createDirectory(baseD8);
      Files.createDirectory(baseDX);
      d8Out = baseD8.resolve(out);
      dxOut = baseDX.resolve(out);
      assertNotEquals(d8Out, dxOut);
    }

    List<String> d8Args = new ArrayList<>(args.length + 2);
    d8Args.add("--dex");
    if (d8Out != null) {
      d8Args.add("--output=" + d8Out);
    }
    Collections.addAll(d8Args, args);
    System.out.println("running: d8 " + StringUtils.join(d8Args, " "));
    CompatDx.main(d8Args.toArray(new String[d8Args.size()]));

    List<String> dxArgs = new ArrayList<>(args.length + 2);
    if (dxOut != null) {
      dxArgs.add("--output=" + dxOut);
    }
    Collections.addAll(dxArgs, args);
    System.out.println("running: dx " + StringUtils.join(dxArgs, " "));
    ProcessResult result = ToolHelper.runDX(dxArgs.toArray(new String[dxArgs.size()]));
    assertEquals(result.stderr, 0, result.exitCode);

    if (out == null) {
      // Can't check output if explicitly not writing any.
      return;
    }

    List<Path> d8Files = Files.list(Files.isDirectory(d8Out) ? d8Out : d8Out.getParent())
        .sorted().collect(Collectors.toList());
    List<Path> dxFiles = Files.list(Files.isDirectory(dxOut) ? dxOut : dxOut.getParent())
        .sorted().collect(Collectors.toList());
    assertEquals("Out file names differ",
        StringUtils.join(dxFiles, "\n", BraceType.NONE, (file) ->
            file.getFileName().toString()),
        StringUtils.join(d8Files, "\n", BraceType.NONE, (file) ->
            file.getFileName().toString()));

    for (int i = 0; i < d8Files.size(); i++) {
      if (FileUtils.isArchive(d8Files.get(i))) {
        compareArchiveFiles(d8Files.get(i), dxFiles.get(i));
      }
    }
  }

  private void compareArchiveFiles(Path d8File, Path dxFile) throws IOException {
    ZipFile d8Zip = new ZipFile(d8File.toFile(), StandardCharsets.UTF_8);
    ZipFile dxZip = new ZipFile(dxFile.toFile(), StandardCharsets.UTF_8);
    // TODO(zerny): This should test resource containment too once supported.
    Set<String> d8Content = d8Zip.stream().map(ZipEntry::getName).collect(Collectors.toSet());
    Set<String> dxContent = dxZip.stream().map(ZipEntry::getName).collect(Collectors.toSet());
    for (String entry : d8Content) {
      assertTrue("Expected dx output to contain " + entry, dxContent.contains(entry));
    }
    for (String entry : dxContent) {
      Path path = Paths.get(entry);
      if (FileUtils.isDexFile(path) || FileUtils.isClassFile(path)) {
        assertTrue("Expected d8 output to contain " + entry, d8Content.contains(entry));
      }
    }
  }
}