import 'dart:io';

import 'package:pipe/pipe.dart';
import 'package:test/test.dart';

/// notifier-field-unread discounts reads inside the notifier's own class body,
/// and nothing else. It used to discount the notifier's whole file, so a
/// private controller rendered by the widget declared next to it was reported
/// as unread (nuwayze's `_AgentHubController`, eight getters, all rendered).
///
/// Each case uses member names no other case reads, because a read is matched
/// by name anywhere in the scan.
const Map<String, String> _files = {
  'lib/support.dart': '''
class ChangeNotifier {
  void notifyListeners() {}
}

class BuildContext {
  T watch<T>() => throw UnimplementedError();
}
''',
  // A private controller and the widget that renders it, in one file.
  'lib/same_file.dart': '''
import 'support.dart';

class _SameFileController extends ChangeNotifier {
  int _sameCount = 0;
  String? _sameLoadError;

  int get sameCount => _sameCount;
  String? get sameLoadError => _sameLoadError;

  void refresh() {
    _sameCount++;
    notifyListeners();
  }
}

class SameFileView {
  String build(BuildContext context) {
    final controller = context.watch<_SameFileController>();
    return '\${controller.sameCount} \${controller.sameLoadError}';
  }
}
''',
  // A controller whose only reader is a part of its library.
  'lib/part_host.dart': '''
import 'support.dart';

part 'part_host_view.dart';

class PartController extends ChangeNotifier {
  int _partTotal = 0;

  int get partTotal => _partTotal;
  String get partStatus => 'ok';

  void bump() {
    _partTotal++;
    notifyListeners();
  }
}
''',
  'lib/part_host_view.dart': '''
part of 'part_host.dart';

class PartView {
  String build(BuildContext context) {
    final controller = context.watch<PartController>();
    return '\${controller.partTotal} \${controller.partStatus}';
  }
}
''',
  // `unreadHiddenCount` is read nowhere, though its sibling is rendered next
  // door: the true positive the same-file fix must keep.
  'lib/unread.dart': '''
import 'support.dart';

class UnreadController extends ChangeNotifier {
  int _unreadShown = 0;
  int _unreadHiddenCount = 0;

  int get unreadShown => _unreadShown;
  int get unreadHiddenCount => _unreadHiddenCount;

  void bump() {
    _unreadShown++;
    _unreadHiddenCount++;
    notifyListeners();
  }
}

class UnreadView {
  String build(BuildContext context) =>
      '\${context.watch<UnreadController>().unreadShown}';
}
''',
  // `selfErrorMessage` is read only by the class itself, which is not a
  // render.
  'lib/self_read.dart': '''
import 'support.dart';

class SelfReadController extends ChangeNotifier {
  String? _selfErrorMessage;

  String get selfLabel => 'label';
  String? get selfErrorMessage => _selfErrorMessage;

  // ignore: unnecessary_this
  String describe() => 'error: \${this.selfErrorMessage}';

  bool sameErrorAs(SelfReadController other) =>
      other.selfErrorMessage == _selfErrorMessage;

  void fail(String message) {
    _selfErrorMessage = message;
    notifyListeners();
  }
}

class SelfReadView {
  String build(BuildContext context) =>
      context.watch<SelfReadController>().selfLabel;
}
''',
};

String _project() {
  final root = Directory.systemTemp.createTempSync('pipe-field-unread');
  File('${root.path}/pubspec.yaml').writeAsStringSync('''
name: field_unread
publish_to: none
environment:
  sdk: ^3.0.0
''');
  File('${root.path}/.dart_tool/package_config.json')
    ..createSync(recursive: true)
    ..writeAsStringSync('''
{
  "configVersion": 2,
  "packages": [
    {
      "name": "field_unread",
      "rootUri": "../",
      "packageUri": "lib/",
      "languageVersion": "3.0"
    }
  ]
}
''');
  for (final entry in _files.entries) {
    File('${root.path}/${entry.key}')
      ..createSync(recursive: true)
      ..writeAsStringSync(entry.value);
  }
  return root.path;
}

void main() {
  late String root;
  late ProjectAnalysis analysis;
  late Map<String, List<Object?>> unreadByOwner;

  setUpAll(() async {
    root = _project();
    analysis = await analyzeProject(
      await loadProject(root),
      concurrency: 1,
      enabledRules: {ruleNotifierFieldUnread},
    );
    unreadByOwner = {
      for (final finding in analysis.report.findings)
        if (finding.rule == ruleNotifierFieldUnread)
          finding.data['owner']! as String: finding.data['members']! as List,
    };
  });

  tearDownAll(() async {
    await analysis.dispose();
    Directory(root).deleteSync(recursive: true);
  });

  test('the scan resolved every file', () {
    // Otherwise a missing finding below could be an analysis failure.
    expect(analysis.report.coverage!.resolved, _files.length);
    expect(analysis.report.notes.join('\n'), isNot(contains('unresolved')));
  });

  test('reads by a widget in the notifier\'s own file count', () {
    expect(unreadByOwner, isNot(contains('_SameFileController')));
  });

  test('reads in a part of the notifier\'s library count', () {
    expect(unreadByOwner, isNot(contains('PartController')));
  });

  test('a member read nowhere is still reported', () {
    expect(unreadByOwner['UnreadController'], ['unreadHiddenCount']);
  });

  test('a member read only inside its own class is still reported', () {
    expect(unreadByOwner['SelfReadController'], ['selfErrorMessage']);
  });
}