// 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.graph.DexItemFactory;
import com.android.tools.r8.utils.AndroidApp;
import com.android.tools.r8.utils.InternalOptions;
import com.android.tools.r8.utils.OffOrAuto;
import com.android.tools.r8.utils.OutputMode;
import com.google.common.collect.ImmutableList;
import java.io.IOException;
import java.nio.file.Path;
import java.nio.file.Paths;

/**
 * Immutable command structure for an invocation of the {@code D8} compiler.
 *
 * <p>To build a D8 command use the {@code D8Command.Builder} class. For example:
 *
 * <pre>
 *   D8Command command = D8Command.builder()
 *     .addProgramFiles(path1, path2)
 *     .setMode(CompilationMode.RELEASE)
 *     .build();
 * </pre>
 */
public class D8Command extends BaseCommand {

  /**
   * Builder for constructing a D8Command.
   */
  public static class Builder extends BaseCommand.Builder<D8Command, Builder> {
    private Builder() {
      super(CompilationMode.DEBUG);
    }

    private Builder(AndroidApp app) {
      super(app, CompilationMode.DEBUG);
    }

    public Builder addClasspathResourceProvider(ResourceProvider provider) {
      getAppBuilder().addClasspathResourceProvider(provider);
      return this;
    }

    public Builder addLibraryResourceProvider(ResourceProvider provider) {
      getAppBuilder().addLibraryResourceProvider(provider);
      return this;
    }

    @Override
    Builder self() {
      return this;
    }

    /**
     * Build the final D8Command.
     */
    @Override
    public D8Command build() throws CompilationException {
      if (isPrintHelp() || isPrintVersion()) {
        return new D8Command(isPrintHelp(), isPrintVersion());
      }
      return new D8Command(getAppBuilder().build(),
          getOutputPath(), getOutputMode(), getMode(), getMinApiLevel());
    }
  }

  static final String USAGE_MESSAGE = String.join("\n", ImmutableList.of(
      "Usage: d8 [options] <input-files>",
      " where <input-files> are any combination of dex, class, zip, jar, or apk files",
      " and options are:",
      "  --debug             # compile with debugging information (default enabled).",
      "  --release           # compile without debugging information.",
      "  --output <file>     # output result in <outfile>.",
      "                      # <file> must be an existing directory or non-existent zip file.",
      "  --lib <file>        # Add <file> as a library resource.",
      "  --classpath <file>  # Add <file> as a classpath resource.",
      "  --min-sdk-version   # minimum Android API level compatibility",
      "  --file-per-class    # produce a separate dex file per class",
      "  --version           # print the version of d8.",
      "  --help              # print this message."));

  public static Builder builder() {
    return new Builder();
  }

  // Internal builder to start from an existing AndroidApp.
  static Builder builder(AndroidApp app) {
    return new Builder(app);
  }

  public static Builder parse(String[] args) throws CompilationException, IOException {
    CompilationMode modeSet = null;
    Path outputPath = null;
    Builder builder = builder();
    for (int i = 0; i < args.length; i++) {
      String arg = args[i].trim();
      if (arg.length() == 0) {
        continue;
      } else if (arg.equals("--help")) {
        builder.setPrintHelp(true);
      } else if (arg.equals("--version")) {
        builder.setPrintVersion(true);
      } else if (arg.equals("--debug")) {
        if (modeSet == CompilationMode.RELEASE) {
          throw new CompilationException("Cannot compile in both --debug and --release mode.");
        }
        builder.setMode(CompilationMode.DEBUG);
        modeSet = CompilationMode.DEBUG;
      } else if (arg.equals("--release")) {
        if (modeSet == CompilationMode.DEBUG) {
          throw new CompilationException("Cannot compile in both --debug and --release mode.");
        }
        builder.setMode(CompilationMode.RELEASE);
        modeSet = CompilationMode.RELEASE;
      } else if (arg.equals("--file-per-class")) {
        builder.setOutputMode(OutputMode.FilePerClass);
      } else if (arg.equals("--output")) {
        String output = args[++i];
        if (outputPath != null) {
          throw new CompilationException(
              "Cannot output both to '" + outputPath.toString() + "' and '" + output + "'");
        }
        outputPath = Paths.get(output);
      } else if (arg.equals("--lib")) {
        builder.addLibraryFiles(Paths.get(args[++i]));
      } else if (arg.equals("--classpath")) {
        builder.addClasspathFiles(Paths.get(args[++i]));
      } else if (arg.equals("--min-sdk-version")) {
        builder.setMinApiLevel(Integer.valueOf(args[++i]));
      } else {
        if (arg.startsWith("--")) {
          throw new CompilationException("Unknown option: " + arg);
        }
        builder.addProgramFiles(Paths.get(arg));
      }
    }
    return builder.setOutputPath(outputPath);
  }

  private D8Command(AndroidApp inputApp, Path outputPath,
      OutputMode outputMode, CompilationMode mode, int minApiLevel) {
    super(inputApp, outputPath, outputMode, mode, minApiLevel);
  }

  private D8Command(boolean printHelp, boolean printVersion) {
    super(printHelp, printVersion);
  }

  @Override
  InternalOptions getInternalOptions() {
    InternalOptions internal = new InternalOptions(new DexItemFactory());
    assert !internal.debug;
    internal.debug = getMode() == CompilationMode.DEBUG;
    internal.minApiLevel = getMinApiLevel();
    internal.fillDexFiles = true;
    // Assert and fixup defaults.
    assert !internal.skipMinification;
    internal.skipMinification = true;
    assert internal.useTreeShaking;
    internal.useTreeShaking = false;
    assert internal.interfaceMethodDesugaring == OffOrAuto.Off;
    assert internal.tryWithResourcesDesugaring == OffOrAuto.Off;
    assert internal.allowAccessModification;
    internal.allowAccessModification = false;
    assert internal.inlineAccessors;
    internal.inlineAccessors = false;
    assert internal.removeSwitchMaps;
    internal.removeSwitchMaps = false;
    assert internal.outline.enabled;
    internal.outline.enabled = false;
    internal.lazyClasspathLoading = true;
    internal.lazyLibraryLoading = true;
    internal.outputMode = getOutputMode();
    return internal;
  }
}