import 'dart:convert';
import 'dart:io';
import 'models.g.dart';

void main() {
  final fixtures = jsonDecode(File.fromUri(Platform.script.resolve('../fixtures.json')).readAsStringSync()) as Map<String, dynamic>;
  final cases = fixtures['valid'] as List;
  for (final fixture in cases) {
    final value = fixture['value'];
    final decoded = switch (fixture['model']) {
      'UUID' || 'Instant' || 'Locale' => value as String,
      'Revision' => value as int,
      'LocalizedMessage' => LocalizedMessage.fromJson(value).toJson(),
      'ErrorData' => ErrorData.fromJson(value).toJson(),
      'HttpProblem' => HttpProblem.fromJson(value).toJson(),
      'ErrorMessagePayload' => ErrorMessagePayload.fromJson(value).toJson(),
      'CommandRejection' => CommandRejection.fromJson(value).toJson(),
      'CatalogPage' => CatalogPage.fromJson(value).toJson(),
      'CatalogResponse' => CatalogResponse.fromJson(value).toJson(),
      _ => throw StateError('Missing fixture decoder: ${fixture['model']}'),
    };
    if (jsonEncode(_canonical(value)) != jsonEncode(_canonical(decoded))) {
      throw StateError('JSON changed: ${fixture['name']}');
    }
  }
  print('${cases.length} shared Dart JSON round trips verified.');
}

dynamic _canonical(dynamic value) {
  if (value is List) return value.map(_canonical).toList();
  if (value is Map) {
    final keys = value.keys.cast<String>().toList()..sort();
    return {for (final key in keys) key: _canonical(value[key])};
  }
  return value;
}