// 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;

import com.android.tools.r8.errors.CompilationError;
import com.android.tools.r8.errors.Unreachable;
import com.android.tools.r8.graph.DexItemFactory;
import com.android.tools.r8.ir.desugar.DesugaredLibraryConfiguration;
import com.android.tools.r8.ir.desugar.DesugaredLibraryConfigurationParser;
import com.android.tools.r8.origin.Origin;
import com.android.tools.r8.utils.AndroidApiLevel;
import com.android.tools.r8.utils.AndroidApp;
import com.android.tools.r8.utils.FileUtils;
import com.android.tools.r8.utils.Reporter;
import com.android.tools.r8.utils.StringDiagnostic;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.List;
import java.util.function.BiPredicate;

/**
 * Base class for commands and command builders for compiler applications/tools which besides an
 * Android application (and optional main-dex list) also configure compilation output, compilation
 * mode and min API level.
 *
 * <p>For concrete builders, see for example {@link D8Command.Builder} and {@link
 * R8Command.Builder}.
 */
@Keep
public abstract class BaseCompilerCommand extends BaseCommand {

  private final CompilationMode mode;
  private final ProgramConsumer programConsumer;
  private final StringConsumer mainDexListConsumer;
  private final int minApiLevel;
  private final Reporter reporter;
  private final boolean enableDesugaring;
  private final boolean includeClassesChecksum;
  private final boolean optimizeMultidexForLinearAlloc;
  private final BiPredicate<String, Long> dexClassChecksumFilter;

  BaseCompilerCommand(boolean printHelp, boolean printVersion) {
    super(printHelp, printVersion);
    programConsumer = null;
    mainDexListConsumer = null;
    mode = null;
    minApiLevel = 0;
    reporter = new Reporter();
    enableDesugaring = true;
    includeClassesChecksum = false;
    optimizeMultidexForLinearAlloc = false;
    dexClassChecksumFilter = (name, checksum) -> true;
  }

  BaseCompilerCommand(
      AndroidApp app,
      CompilationMode mode,
      ProgramConsumer programConsumer,
      StringConsumer mainDexListConsumer,
      int minApiLevel,
      Reporter reporter,
      boolean enableDesugaring,
      boolean optimizeMultidexForLinearAlloc,
      boolean includeClassesChecksum,
      BiPredicate<String, Long> dexClassChecksumFilter) {
    super(app);
    assert minApiLevel > 0;
    assert mode != null;
    this.mode = mode;
    this.programConsumer = programConsumer;
    this.mainDexListConsumer = mainDexListConsumer;
    this.minApiLevel = minApiLevel;
    this.reporter = reporter;
    this.enableDesugaring = enableDesugaring;
    this.optimizeMultidexForLinearAlloc = optimizeMultidexForLinearAlloc;
    this.includeClassesChecksum = includeClassesChecksum;
    this.dexClassChecksumFilter = dexClassChecksumFilter;
  }

  /**
   * Get the compilation mode, e.g., {@link CompilationMode#DEBUG} or {@link
   * CompilationMode#RELEASE}.
   */
  public CompilationMode getMode() {
    return mode;
  }

  /** Get the minimum API level to compile against. */
  public int getMinApiLevel() {
    return minApiLevel;
  }

  /**
   * Get the program consumer that will receive the compilation output.
   *
   * <p>Note that the concrete consumer reference is final, the consumer itself is likely stateful.
   */
  public ProgramConsumer getProgramConsumer() {
    return programConsumer;
  }

  /**
   * Get the main dex list consumer that will receive the final complete main dex list.
   */
  public StringConsumer getMainDexListConsumer() {
    return mainDexListConsumer;
  }

  /** Get the use-desugaring state. True if enabled, false otherwise. */
  public boolean getEnableDesugaring() {
    return enableDesugaring;
  }

  /** True if the output dex files has checksum information encoded in it. False otherwise. */
  public boolean getIncludeClassesChecksum() {
    return includeClassesChecksum;
  }

  /** Filter used to skip parsing of certain class in a dex file. */
  public BiPredicate<String, Long> getDexClassChecksumFilter() {
    return dexClassChecksumFilter;
  }

  /**
   * If true, legacy multidex partitioning will be optimized to reduce LinearAlloc usage during
   * Dalvik DexOpt.
   */
  public boolean isOptimizeMultidexForLinearAlloc() {
    return optimizeMultidexForLinearAlloc;
  }

  Reporter getReporter() {
    return reporter;
  }

  /**
   * Base builder for compilation commands.
   *
   * @param <C> Command the builder is building, e.g., {@link R8Command} or {@link D8Command}.
   * @param <B> Concrete builder extending this base, e.g., {@link R8Command.Builder} or {@link
   *     D8Command.Builder}.
   */
  @Keep
  public abstract static class Builder<C extends BaseCompilerCommand, B extends Builder<C, B>>
      extends BaseCommand.Builder<C, B> {

    private ProgramConsumer programConsumer = null;
    private StringConsumer mainDexListConsumer = null;
    private Path outputPath = null;
    // TODO(b/70656566): Remove default output mode when deprecated API is removed.
    private OutputMode outputMode = OutputMode.DexIndexed;

    private CompilationMode mode;
    private int minApiLevel = 0;
    private boolean disableDesugaring = false;
    private List<StringResource> desugaredLibraryConfigurationResources = new ArrayList<>();
    private boolean includeClassesChecksum = false;
    private boolean lookupLibraryBeforeProgram = true;
    private boolean optimizeMultidexForLinearAlloc = false;
    private BiPredicate<String, Long> dexClassChecksumFilter = (name, checksum) -> true;

    abstract CompilationMode defaultCompilationMode();

    Builder() {
      mode = defaultCompilationMode();
    }

    Builder(DiagnosticsHandler diagnosticsHandler) {
      super(diagnosticsHandler);
      mode = defaultCompilationMode();
    }

    // Internal constructor for testing.
    Builder(AndroidApp app) {
      super(AndroidApp.builder(app));
      mode = defaultCompilationMode();
    }

    // Internal constructor for testing.
    Builder(AndroidApp app, DiagnosticsHandler diagnosticsHandler) {
      super(AndroidApp.builder(app, new Reporter(diagnosticsHandler)));
      mode = defaultCompilationMode();
    }

    /**
     * Get current compilation mode.
     */
    public CompilationMode getMode() {
      return mode;
    }

    /**
     * Set compilation mode.
     */
    public B setMode(CompilationMode mode) {
      assert mode != null;
      this.mode = mode;
      return self();
    }

    /**
     * Get the output path.
     *
     * @return Current output path, null if no output path-and-mode have been set.
     * @see #setOutput(Path, OutputMode)
     */
    public Path getOutputPath() {
      return outputPath;
    }

    /**
     * Get the output mode.
     *
     * @return Currently set output mode, null if no output path-and-mode have been set.
     * @see #setOutput(Path, OutputMode)
     */
    public OutputMode getOutputMode() {
      return outputMode;
    }

    /**
     * Get the program consumer.
     *
     * @return The currently set program consumer, null if no program consumer or output
     *     path-and-mode is set, e.g., neither {@link #setProgramConsumer} nor {@link #setOutput}
     *     have been called.
     */
    public ProgramConsumer getProgramConsumer() {
      return programConsumer;
    }

    /**
     * Get the main dex list consumer that will receive the final complete main dex list.
     */
    public StringConsumer getMainDexListConsumer() {
      return mainDexListConsumer;
    }

    /**
     * Filter used to skip parsing of certain class in a dex file.
     */
    public BiPredicate<String, Long> getDexClassChecksumFilter() {
      return dexClassChecksumFilter;
    }

    /**
     * If set to true, legacy multidex partitioning will be optimized to reduce LinearAlloc usage
     * during Dalvik DexOpt. Has no effect when compiling for a target with native multidex support
     * or without main dex list specification.
     */
    public B setOptimizeMultidexForLinearAlloc(boolean optimizeMultidexForLinearAlloc) {
      this.optimizeMultidexForLinearAlloc = optimizeMultidexForLinearAlloc;
      return self();
    }

    /**
     * If true, legacy multidex partitioning will be optimized to reduce LinearAlloc usage during
     * Dalvik DexOpt.
     */
    protected boolean isOptimizeMultidexForLinearAlloc() {
      return optimizeMultidexForLinearAlloc;
    }

    /**
     * Set the program consumer.
     *
     * <p>Setting the program consumer will override any previous set consumer or any previous set
     * output path & mode.
     *
     * @param programConsumer Program consumer to set as current. A null argument will clear the
     *     program consumer / output.
     */
    public B setProgramConsumer(ProgramConsumer programConsumer) {
      // Setting an explicit program consumer resets any output-path/mode setup.
      outputPath = null;
      outputMode = null;
      this.programConsumer = programConsumer;
      return self();
    }

    /**
     * Set an output destination to which main-dex-list content should be written.
     *
     * <p>This is a short-hand for setting a {@link StringConsumer.FileConsumer} using {@link
     * #setMainDexListConsumer}. Note that any subsequent call to this method or {@link
     * #setMainDexListConsumer} will override the previous setting.
     *
     * @param mainDexListOutputPath File-system path to write output at.
     */
    public B setMainDexListOutputPath(Path mainDexListOutputPath) {
      mainDexListConsumer = new StringConsumer.FileConsumer(mainDexListOutputPath);
      return self();
    }

    /**
     * Set a consumer for receiving the main-dex-list content.
     *
     * <p>Note that any subsequent call to this method or {@link #setMainDexListOutputPath} will
     * override the previous setting.
     *
     * @param mainDexListConsumer Consumer to receive the content once produced.
     */
    public B setMainDexListConsumer(StringConsumer mainDexListConsumer) {
      this.mainDexListConsumer = mainDexListConsumer;
      return self();
    }

    /**
     * Set the output path-and-mode.
     *
     * <p>Setting the output path-and-mode will override any previous set consumer or any previous
     * output path-and-mode, and implicitly sets the appropriate program consumer to write the
     * output.
     *
     * @param outputPath Path to write the output to. Must be an archive or and existing directory.
     * @param outputMode Mode in which to write the output.
     */
    public B setOutput(Path outputPath, OutputMode outputMode) {
      return setOutput(outputPath, outputMode, false);
    }

    // This is only public in R8Command.
    protected B setOutput(Path outputPath, OutputMode outputMode, boolean includeDataResources) {
      assert outputPath != null;
      assert outputMode != null;
      this.outputPath = outputPath;
      this.outputMode = outputMode;
      programConsumer = createProgramOutputConsumer(outputPath, outputMode, includeDataResources);
      return self();
    }

    /**
     * Setting a dex class filter.
     *
     * A filter is a function that given a name of a class and a checksum can return false the user
     * decides to skip parsing and ignore that class in the dex file.
     */
    public B setDexClassChecksumFilter(BiPredicate<String, Long> filter) {
      assert filter != null;
      this.dexClassChecksumFilter = filter;
      return self();
    }

    protected InternalProgramOutputPathConsumer createProgramOutputConsumer(
        Path path,
        OutputMode mode,
        boolean consumeDataResources) {
      if (mode == OutputMode.DexIndexed) {
        return FileUtils.isArchive(path)
            ? new DexIndexedConsumer.ArchiveConsumer(path, consumeDataResources)
            : new DexIndexedConsumer.DirectoryConsumer(path, consumeDataResources);
      }
      if (mode == OutputMode.DexFilePerClass) {
        if (FileUtils.isArchive(path)) {
          return new DexFilePerClassFileConsumer.ArchiveConsumer(path, consumeDataResources) {
            @Override
            public boolean combineSyntheticClassesWithPrimaryClass() {
              return false;
            }
          };
        } else {
          return new DexFilePerClassFileConsumer.DirectoryConsumer(path, consumeDataResources) {
            @Override
            public boolean combineSyntheticClassesWithPrimaryClass() {
              return false;
            }
          };
        }
      }
      if (mode == OutputMode.DexFilePerClassFile) {
        return FileUtils.isArchive(path)
            ? new DexFilePerClassFileConsumer.ArchiveConsumer(path, consumeDataResources)
            : new DexFilePerClassFileConsumer.DirectoryConsumer(path, consumeDataResources);
      }
      if (mode == OutputMode.ClassFile) {
        return FileUtils.isArchive(path)
            ? new ClassFileConsumer.ArchiveConsumer(path, consumeDataResources)
            : new ClassFileConsumer.DirectoryConsumer(path, consumeDataResources);
      }
      throw new Unreachable("Unexpected output mode: " + mode);
    }

    /** Get the minimum API level (aka SDK version). */
    public int getMinApiLevel() {
      return isMinApiLevelSet() ? minApiLevel : AndroidApiLevel.getDefault().getLevel();
    }

    boolean isMinApiLevelSet() {
      return minApiLevel != 0;
    }

    /** Set the minimum required API level (aka SDK version). */
    public B setMinApiLevel(int minApiLevel) {
      if (minApiLevel <= 0) {
        getReporter().error("Invalid minApiLevel: " + minApiLevel);
      } else {
        this.minApiLevel = minApiLevel;
      }
      return self();
    }

    @Deprecated
    public B setEnableDesugaring(boolean enableDesugaring) {
      this.disableDesugaring = !enableDesugaring;
      return self();
    }

    /**
     * Force disable desugaring.
     *
     * <p>There are a few use cases where it makes sense to force disable desugaring, such as:
     * <ul>
     * <li>if all inputs are known to be at most Java 7; or
     * <li>if a separate desugar tool has been used prior to compiling with D8.
     * </ul>
     *
     * <p>Note that even for API 27, desugaring is still required for closures support on ART.
     */
    public B setDisableDesugaring(boolean disableDesugaring) {
      this.disableDesugaring = disableDesugaring;
      return self();
    }

    /** Is desugaring forcefully disabled. */
    public boolean getDisableDesugaring() {
      return disableDesugaring;
    }

    @Deprecated
    public B addSpecialLibraryConfiguration(String configuration) {
      return addDesugaredLibraryConfiguration(configuration);
    }

    /** Desugared library configuration */
    // Configuration "default" is for testing only and support will be dropped.
    public B addDesugaredLibraryConfiguration(String configuration) {
      this.desugaredLibraryConfigurationResources.add(
          StringResource.fromString(configuration, Origin.unknown()));
      return self();
    }

    /** Desugared library configuration */
    public B addDesugaredLibraryConfiguration(StringResource configuration) {
      this.desugaredLibraryConfigurationResources.add(configuration);
      return self();
    }

    DesugaredLibraryConfiguration getDesugaredLibraryConfiguration(
        DexItemFactory factory, boolean libraryCompilation, int minAPILevel) {
      if (desugaredLibraryConfigurationResources.isEmpty()) {
        return DesugaredLibraryConfiguration.empty();
      }
      if (desugaredLibraryConfigurationResources.size() > 1) {
        throw new CompilationError("Only one desugared library configuration is supported.");
      }
      StringResource desugaredLibraryConfigurationResource =
          desugaredLibraryConfigurationResources.get(0);

      // TODO(b/134732760): Remove the following once the default testing hack is not supported
      // anymore.
      try {
        if (desugaredLibraryConfigurationResource.getString().equals("default")) {
          if (libraryCompilation) {
            return DesugaredLibraryConfigurationForTesting
                .configureLibraryDesugaringForLibraryCompilation(minAPILevel, factory);
          }
          return DesugaredLibraryConfigurationForTesting
              .configureLibraryDesugaringForProgramCompilation(minAPILevel, factory);
        }
      } catch (ResourceException e) {
        throw new RuntimeException(e);
      }

      DesugaredLibraryConfigurationParser libraryParser =
          new DesugaredLibraryConfigurationParser(
              factory, getReporter(), libraryCompilation, getMinApiLevel());
      return libraryParser.parse(desugaredLibraryConfigurationResource);
    }

    boolean hasDesugaredLibraryConfiguration() {
      return !desugaredLibraryConfigurationResources.isEmpty();
    }

    /** Encodes checksum for each class when generating dex files. */
    public B setIncludeClassesChecksum(boolean enabled) {
      this.includeClassesChecksum = enabled;
      return self();
    }

    /** Encodes the checksums into the dex output. */
    public boolean getIncludeClassesChecksum() {
      return includeClassesChecksum;
    }

    @Override
    void validate() {
      Reporter reporter = getReporter();
      if (mode == null) {
        reporter.error("Expected valid compilation mode, was null");
      }
      FileUtils.validateOutputFile(outputPath, reporter);
      if (getProgramConsumer() == null) {
        // This is never the case for a command-line parse, so we report using API references.
        reporter.error("A ProgramConsumer or Output is required for compilation");
      }
      List<Class> programConsumerClasses = new ArrayList<>(3);
      if (programConsumer instanceof DexIndexedConsumer) {
        programConsumerClasses.add(DexIndexedConsumer.class);
      }
      if (programConsumer instanceof DexFilePerClassFileConsumer) {
        programConsumerClasses.add(DexFilePerClassFileConsumer.class);
      }
      if (programConsumer instanceof ClassFileConsumer) {
        programConsumerClasses.add(ClassFileConsumer.class);
      }
      if (programConsumerClasses.size() > 1) {
        StringBuilder builder = new StringBuilder()
            .append("Invalid program consumer.")
            .append(" A program consumer can implement at most one consumer type but ")
            .append(programConsumer.getClass().getName())
            .append(" implements types:");
        for (Class clazz : programConsumerClasses) {
          builder.append(" ").append(clazz.getName());
        }
        reporter.error(builder.toString());
      }
      if (hasDesugaredLibraryConfiguration()) {
        reporter.warning(
            new StringDiagnostic("Desugared library configuration is still work in progress"));
      }
      super.validate();
    }
  }
}