// Copyright 2014 The Flutter Authors. 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:io';

import 'package:path/path.dart' as path;

import '../analyze.dart';
import '../custom_rules/analyze.dart';
import '../custom_rules/no_double_clamp.dart';
import '../custom_rules/no_stop_watches.dart';
import '../custom_rules/render_box_intrinsics.dart';
import '../utils.dart';
import 'common.dart';

typedef AsyncVoidCallback = Future<void> Function();

Future<String> capture(AsyncVoidCallback callback, {bool shouldHaveErrors = false}) async {
  final StringBuffer buffer = StringBuffer();
  final PrintCallback oldPrint = print;
  try {
    print = (Object? line) {
      buffer.writeln(line);
    };
    await callback();
    expect(
      hasError,
      shouldHaveErrors,
      reason: buffer.isEmpty
          ? '(No output to report.)'
          : hasError
          ? 'Unexpected errors:\n$buffer'
          : 'Unexpected success:\n$buffer',
    );
  } finally {
    print = oldPrint;
    resetErrorStatus();
  }
  if (stdout.supportsAnsiEscapes) {
    // Remove ANSI escapes when this test is running on a terminal.
    return buffer.toString().replaceAll(RegExp(r'(\x9B|\x1B\[)[0-?]{1,3}[ -/]*[@-~]'), '');
  } else {
    return buffer.toString();
  }
}

void main() {
  final String testRootPath = path.join('test', 'analyze-test-input', 'root');
  final String dartName = Platform.isWindows ? 'dart.exe' : 'dart';
  final String dartPath = path.canonicalize(
    path.join('..', '..', 'bin', 'cache', 'dart-sdk', 'bin', dartName),
  );
  final String testGenDefaultsPath = path.join('test', 'analyze-gen-defaults');

  test('matchesErrorsInFile matcher basic test', () async {
    final String result = await capture(() async {
      foundError(<String>[
        'meta.dart:5: error #1',
        'meta.dart:5: error #2',
        'meta.dart:6: error #3',
        '',
        'Error summary',
      ]);
    }, shouldHaveErrors: true);
    final File fixture = File(path.join(testRootPath, 'packages', 'foo', 'meta.dart'));
    expect(result, matchesErrorsInFile(fixture, endsWith: <String>['', 'Error summary']));
  });

  test('analyze.dart - verifyDeprecations', () async {
    final String result = await capture(
      () => verifyDeprecations(testRootPath, minimumMatches: 2),
      shouldHaveErrors: true,
    );
    final File fixture = File(path.join(testRootPath, 'packages', 'foo', 'deprecation.dart'));
    expect(
      result,
      matchesErrorsInFile(
        fixture,
        endsWith: <String>[
          'See: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes',
        ],
      ),
    );
  });

  test('analyze.dart - verifyGoldenTags', () async {
    final List<String> result = (await capture(
      () => verifyGoldenTags(testRootPath, minimumMatches: 6),
      shouldHaveErrors: true,
    )).split('\n');
    const String noTag =
        "Files containing golden tests must be tagged using @Tags(<String>['reduced-test-set']) "
        'at the top of the file before import statements.';
    const String missingTag =
        "Files containing golden tests must be tagged with 'reduced-test-set'.";
    final List<String> lines = <String>[
      '║ test/analyze-test-input/root/packages/foo/golden_missing_tag.dart: $missingTag',
      '║ test/analyze-test-input/root/packages/foo/golden_no_tag.dart: $noTag',
    ].map((String line) => line.replaceAll('/', Platform.isWindows ? r'\' : '/')).toList();
    expect(
      result.length,
      4 + lines.length,
      reason: 'output had unexpected number of lines:\n${result.join('\n')}',
    );
    expect(
      result[0],
      '╔═╡ERROR #1╞════════════════════════════════════════════════════════════════════',
    );
    expect(result.getRange(1, result.length - 3).toSet(), lines.toSet());
    expect(
      result[result.length - 3],
      '║ See: https://github.com/flutter/flutter/blob/main/docs/contributing/testing/Writing-a-golden-file-test-for-package-flutter.md',
    );
    expect(
      result[result.length - 2],
      '╚═══════════════════════════════════════════════════════════════════════════════',
    );
    expect(result[result.length - 1], ''); // trailing newline
  });

  test('analyze.dart - verifyNoMissingLicense', () async {
    final String result = await capture(
      () => verifyNoMissingLicense(testRootPath, checkMinimums: false),
      shouldHaveErrors: true,
    );
    final String file = 'test/analyze-test-input/root/packages/foo/foo.dart'.replaceAll(
      '/',
      Platform.isWindows ? r'\' : '/',
    );
    expect(
      result,
      '╔═╡ERROR #1╞════════════════════════════════════════════════════════════════════\n'
      '║ The following file does not have the right license header for dart files:\n'
      '║   $file\n'
      '║ The expected license header is:\n'
      '║ // Copyright 2014 The Flutter Authors. All rights reserved.\n'
      '║ // Use of this source code is governed by a BSD-style license that can be\n'
      '║ // found in the LICENSE file.\n'
      '║ ...followed by a blank line.\n'
      '╚═══════════════════════════════════════════════════════════════════════════════\n',
    );
  });

  test('analyze.dart - verifyNoTrailingSpaces', () async {
    final String result = await capture(
      () => verifyNoTrailingSpaces(testRootPath, minimumMatches: 2),
      shouldHaveErrors: true,
    );
    final String lines = <String>[
      '║ test/analyze-test-input/root/packages/foo/spaces.txt:5: trailing U+0020 space character',
      '║ test/analyze-test-input/root/packages/foo/spaces.txt:9: trailing blank line',
    ].map((String line) => line.replaceAll('/', Platform.isWindows ? r'\' : '/')).join('\n');
    expect(
      result,
      '╔═╡ERROR #1╞════════════════════════════════════════════════════════════════════\n'
      '$lines\n'
      '╚═══════════════════════════════════════════════════════════════════════════════\n',
    );
  });

  test('analyze.dart - verifyRepositoryLinks', () async {
    final String result = await capture(
      () => verifyRepositoryLinks(testRootPath),
      shouldHaveErrors: true,
    );
    const String bannedBranch = 'master';
    final String file = Platform.isWindows
        ? r'test\analyze-test-input\root\packages\foo\bad_repository_links.dart'
        : 'test/analyze-test-input/root/packages/foo/bad_repository_links.dart';
    final String lines = <String>[
      '║ $file contains https://android.googlesource.com/+/$bannedBranch/file1, which uses the banned "master" branch.',
      '║ $file contains https://chromium.googlesource.com/+/$bannedBranch/file1, which uses the banned "master" branch.',
      '║ $file contains https://cs.opensource.google.com/+/$bannedBranch/file1, which uses the banned "master" branch.',
      '║ $file contains https://dart.googlesource.com/+/$bannedBranch/file1, which uses the banned "master" branch.',
      '║ $file contains https://flutter.googlesource.com/+/$bannedBranch/file1, which uses the banned "master" branch.',
      '║ $file contains https://source.chromium.org/+/$bannedBranch/file1, which uses the banned "master" branch.',
      '║ $file contains https://github.com/flutter/flutter/tree/$bannedBranch/file1, which uses the banned "master" branch.',
      '║ $file contains https://raw.githubusercontent.com/flutter/flutter/blob/$bannedBranch/file1, which uses the banned "master" branch.',
      '║ Change the URLs above to the expected pattern by using the "main" branch if it exists, otherwise adding the repository to the list of exceptions in analyze.dart.',
    ].join('\n');
    expect(
      result,
      '╔═╡ERROR #1╞════════════════════════════════════════════════════════════════════\n'
      '$lines\n'
      '╚═══════════════════════════════════════════════════════════════════════════════\n',
    );
  });

  test('analyze.dart - verifyNoBinaries - positive', () async {
    final String result = await capture(
      () => verifyNoBinaries(
        testRootPath,
        legacyBinaries: <Hash256>{const Hash256(0x39A050CD69434936, 0, 0, 0)},
      ),
      shouldHaveErrors: !Platform.isWindows,
    );
    if (!Platform.isWindows) {
      expect(
        result,
        '╔═╡ERROR #1╞════════════════════════════════════════════════════════════════════\n'
        '║ test/analyze-test-input/root/packages/foo/serviceaccount.enc:0: file is not valid UTF-8\n'
        '║ All files in this repository must be UTF-8. In particular, images and other binaries\n'
        '║ must not be checked into this repository. This is because we are very sensitive to the\n'
        '║ size of the repository as it is distributed to all our developers. If you have a binary\n'
        '║ to which you need access, you should consider how to fetch it from another repository;\n'
        '║ for example, the "assets-for-api-docs" repository is used for images in API docs.\n'
        '║ To add assets to flutter_tools templates, see the instructions in the wiki:\n'
        '║ https://github.com/flutter/flutter/blob/main/docs/tool/Managing-template-image-assets.md\n'
        '╚═══════════════════════════════════════════════════════════════════════════════\n',
      );
    }
  });

  test('analyze.dart - verifyInternationalizations - comparison fails', () async {
    final String result = await capture(
      () => verifyInternationalizations(testRootPath, dartPath),
      shouldHaveErrors: true,
    );
    final String genLocalizationsScript = path.join(
      'dev',
      'tools',
      'localization',
      'bin',
      'gen_localizations.dart',
    );
    expect(result, contains('$dartName $genLocalizationsScript --cupertino'));
    expect(result, contains('$dartName $genLocalizationsScript --material'));
    final String generatedFile = path.join(
      testRootPath,
      'packages',
      'flutter_localizations',
      'lib',
      'src',
      'l10n',
      'generated_material_localizations.dart',
    );
    expect(
      result,
      contains(
        'The contents of $generatedFile are different from that produced by gen_localizations.',
      ),
    );
    expect(
      result,
      contains(r'Did you forget to run gen_localizations.dart after updating a .arb file?'),
    );
  });

  test('analyze.dart - verifyNoBinaries - negative', () async {
    await capture(
      () => verifyNoBinaries(
        testRootPath,
        legacyBinaries: <Hash256>{
          const Hash256(
            0xA8100AE6AA1940D0,
            0xB663BB31CD466142,
            0xEBBDBD5187131B92,
            0xD93818987832EB89,
          ), // sha256("\xff")
          const Hash256(0x155644D3F13D98BF, 0, 0, 0),
        },
      ),
    );
  });

  test('analyze.dart - verifyNullInitializedDebugExpensiveFields', () async {
    final String result = await capture(
      () => verifyNullInitializedDebugExpensiveFields(testRootPath, minimumMatches: 1),
      shouldHaveErrors: true,
    );

    final File fixture = File(path.join(testRootPath, 'packages', 'flutter', 'lib', 'bar.dart'));
    expect(
      result,
      matchesErrorsInFile(
        fixture,
        endsWith: <String>[
          '',
          'Fields annotated with @_debugOnly must null initialize,',
          'to ensure both the field and initializer are removed from profile/release mode.',
          'These fields should be written as:',
          'field = kDebugMode ? <DebugValue> : null;',
        ],
      ),
    );
  });

  test('analyze.dart - verifyTabooDocumentation', () async {
    final String result = await capture(
      () => verifyTabooDocumentation(testRootPath, minimumMatches: 1),
      shouldHaveErrors: true,
    );

    final File fixture = File(
      path.join(testRootPath, 'packages', 'flutter', 'lib', 'taboo_words.dart'),
    );
    expect(
      result,
      matchesErrorsInFile(
        fixture,
        endsWith: <String>[
          '',
          'Avoid the word "simply" in documentation. See https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#use-the-passive-voice-recommend-do-not-require-never-say-things-are-simple for details.',
          'In many cases these words can be omitted without loss of generality; in other cases it may require a bit of rewording to avoid implying that the task is simple.',
          'Similarly, avoid using "note:" or the phrase "note that". See https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#avoid-empty-prose for details.',
        ],
      ),
    );
  });

  test('analyze.dart - clampDouble', () async {
    final String result = await capture(
      () => analyzeWithRules(
        testRootPath,
        <AnalyzeRule>[noDoubleClamp],
        includePaths: <String>['packages/flutter/lib'],
      ),
      shouldHaveErrors: true,
    );

    final File fixture = File(
      path.join(testRootPath, 'packages', 'flutter', 'lib', 'double_clamp.dart'),
    );
    expect(
      result,
      matchesErrorsInFile(
        fixture,
        endsWith: <String>[
          '', // empty line before the last sentence.
          'For performance reasons, we use a custom "clampDouble" function instead of using "double.clamp".',
        ],
      ),
    );
  });

  test('analyze.dart - stopwatch', () async {
    final String result = await capture(
      () => analyzeWithRules(
        testRootPath,
        <AnalyzeRule>[noStopwatches],
        includePaths: <String>['packages/flutter/lib'],
      ),
      shouldHaveErrors: true,
    );

    final File fixture = File(
      path.join(testRootPath, 'packages', 'flutter', 'lib', 'stopwatch.dart'),
    );
    expect(
      result,
      matchesErrorsInFile(
        fixture,
        endsWith: <String>[
          '',
          'Stopwatches introduce flakes by falling out of sync with the FakeAsync used in testing.',
          'A Stopwatch that stays in sync with FakeAsync is available through the Gesture or Test bindings, through samplingClock.',
        ],
      ),
    );
  });

  test('analyze.dart - RenderBox intrinsics', () async {
    final String result = await capture(
      () => analyzeWithRules(
        testRootPath,
        <AnalyzeRule>[renderBoxIntrinsicCalculation],
        includePaths: <String>['packages/flutter/lib'],
      ),
      shouldHaveErrors: true,
    );
    final File fixture = File(
      path.join(testRootPath, 'packages', 'flutter', 'lib', 'renderbox_intrinsics.dart'),
    );
    expect(
      result,
      matchesErrorsInFile(
        fixture,
        endsWith: <String>[
          '',
          'Typically the get* methods should be used to obtain the intrinsics of a RenderBox.',
        ],
      ),
    );
  });

  test('analyze.dart - verifyMaterialFilesAreUpToDateWithTemplateFiles', () async {
    String result = await capture(
      () => verifyMaterialFilesAreUpToDateWithTemplateFiles(testGenDefaultsPath, dartPath),
      shouldHaveErrors: true,
    );
    final String lines = <String>[
      '║ chip.dart is not up-to-date with the token template file.',
    ].map((String line) => line.replaceAll('/', Platform.isWindows ? r'\' : '/')).join('\n');
    const String errorStart = '╔═';
    result = result.substring(result.indexOf(errorStart));
    expect(
      result,
      '╔═╡ERROR #1╞════════════════════════════════════════════════════════════════════\n'
      '$lines\n'
      '║ See: https://github.com/flutter/flutter/blob/main/dev/tools/gen_defaults to update the token template files.\n'
      '╚═══════════════════════════════════════════════════════════════════════════════\n',
    );
  });
}