// Copyright (c) 2019, the Dart 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.

import 'dart:async';
import 'dart:io';
import 'dart:math';

import 'package:pool/pool.dart';

const String clangTidy = './buildtools/linux-x64/clang/bin/clang-tidy';

List<String> compilerFlagsForFile(String filepath) {
  final flags = <String>[
    '-Iruntime',
    '-Ithird_party',
    '-Iruntime/include',
    '-Ithird_party/tcmalloc/gperftools/src',
    '-Ithird_party/boringssl/src/include',
    '-Ithird_party/zlib',
    '-DTARGET_ARCH_X64',
    '-DDEBUG',
    '-DTARGET_OS_LINUX',
    '-DTESTING',
    '-x',
    'c++',
  ];
  return flags;
}

Future<ProcessResult> runClangTidyOn(String filepath) async {
  // The `runtime/.clang-tidy` file has the enabled checks in it.
  final args = <String>['-quiet', filepath, '--']
    ..addAll(compilerFlagsForFile(filepath));
  return await Process.run(clangTidy, args);
}

final pool = new Pool(max(1, Platform.numberOfProcessors ~/ 2));

// Exclude running the linter on those files.
final Set<String> excludedFiles = Set<String>.from([
  // These files are not valid cc files but rather cc templates
  'runtime/bin/abi_version_in.cc',
  'runtime/bin/builtin_in.cc',
  'runtime/bin/snapshot_in.cc',
  'runtime/lib/libgen_in.cc',
  'runtime/vm/version_in.cc',

  // These files cannot be analyzed by itself (must be included indirectly).
  'runtime/bin/android.h',
  'runtime/bin/eventhandler_android.h',
  'runtime/bin/eventhandler_fuchsia.h',
  'runtime/bin/eventhandler_linux.h',
  'runtime/bin/eventhandler_macos.h',
  'runtime/bin/eventhandler_win.h',
  'runtime/bin/namespace_android.h',
  'runtime/bin/namespace_fuchsia.h',
  'runtime/bin/namespace_linux.h',
  'runtime/bin/namespace_macos.h',
  'runtime/bin/namespace_win.h',
  'runtime/bin/socket_base_android.h',
  'runtime/bin/socket_base_fuchsia.h',
  'runtime/bin/socket_base_linux.h',
  'runtime/bin/socket_base_macos.h',
  'runtime/bin/socket_base_win.h',
  'runtime/bin/thread_android.h',
  'runtime/bin/thread_fuchsia.h',
  'runtime/bin/thread_linux.h',
  'runtime/bin/thread_macos.h',
  'runtime/bin/thread_win.h',
  'runtime/platform/atomic_android.h',
  'runtime/platform/atomic_fuchsia.h',
  'runtime/platform/atomic_linux.h',
  'runtime/platform/atomic_macos.h',
  'runtime/platform/atomic_win.h',
  'runtime/platform/utils_android.h',
  'runtime/platform/utils_fuchsia.h',
  'runtime/platform/utils_linux.h',
  'runtime/platform/utils_macos.h',
  'runtime/platform/utils_win.h',
  'runtime/vm/compiler/assembler/assembler_arm64.h',
  'runtime/vm/compiler/assembler/assembler_arm.h',
  'runtime/vm/compiler/assembler/assembler_dbc.h',
  'runtime/vm/compiler/assembler/assembler_ia32.h',
  'runtime/vm/compiler/assembler/assembler_x64.h',
  'runtime/vm/compiler/runtime_offsets_extracted.h',
  'runtime/vm/constants_arm64.h',
  'runtime/vm/constants_arm.h',
  'runtime/vm/constants_dbc.h',
  'runtime/vm/constants_ia32.h',
  'runtime/vm/constants_x64.h',
  'runtime/vm/cpu_arm64.h',
  'runtime/vm/cpu_arm.h',
  'runtime/vm/cpu_dbc.h',
  'runtime/vm/cpu_ia32.h',
  'runtime/vm/cpu_x64.h',
  'runtime/vm/instructions_arm64.h',
  'runtime/vm/instructions_arm.h',
  'runtime/vm/instructions_dbc.h',
  'runtime/vm/instructions_ia32.h',
  'runtime/vm/instructions_x64.h',
  'runtime/vm/os_thread_android.h',
  'runtime/vm/os_thread_fuchsia.h',
  'runtime/vm/os_thread_linux.h',
  'runtime/vm/os_thread_macos.h',
  'runtime/vm/os_thread_win.h',
  'runtime/vm/regexp_assembler_bytecode_inl.h',
  'runtime/vm/simulator_arm64.h',
  'runtime/vm/simulator_arm.h',
  'runtime/vm/simulator_dbc.h',
  'runtime/vm/stack_frame_arm64.h',
  'runtime/vm/stack_frame_arm.h',
  'runtime/vm/stack_frame_dbc.h',
  'runtime/vm/stack_frame_ia32.h',
  'runtime/vm/stack_frame_x64.h',

  // By default the gclient checkout doesn't have llvm pulled in.
  'runtime/llvm_codegen/bit/bit.h',
  'runtime/llvm_codegen/bit/main.cc',
  'runtime/llvm_codegen/bit/test.cc',
  'runtime/llvm_codegen/codegen/main.cc',

  // Only available in special builds
  'runtime/bin/io_service_no_ssl.h',
  'runtime/bin/utils_win.h',
  'runtime/vm/compiler/backend/locations_helpers_arm.h',
]);

main(List<String> files) async {
  bool isFirstFailure = true;

  files = files.where((filepath) => !excludedFiles.contains(filepath)).toList();

  // Analyze the [files] in parallel.
  await Future.wait(files.map((String filepath) async {
    final processResult =
        await pool.withResource(() => runClangTidyOn(filepath));

    final int exitCode = processResult.exitCode;
    final String stdout = processResult.stdout.trim();
    final String stderr = processResult.stderr.trim();

    if (exitCode != 0 || stdout.isNotEmpty) {
      if (!isFirstFailure) {
        print('');
        print('--------------------------------------------------------------');
        print('');
      }
      isFirstFailure = false;
    }

    if (exitCode != 0) {
      print('exit-code: $exitCode');
      print('stdout:');
      print('${stdout}');
      print('stderr:');
      print('${stderr}');
    } else if (stdout.isNotEmpty) {
      // The actual lints go to stdout.
      print(stdout);
    }
  }));
}