tane/apps/app_seeds/test/services/label_sheet_service_test.dart

import 'dart:typed_data';

import 'package:flutter_test/flutter_test.dart';
import 'package:tane/services/file_service.dart';
import 'package:tane/services/label_sheet_service.dart';

/// Captures the bytes handed to the save dialog instead of touching disk.
class _RecordingFileService implements FileService {
  Uint8List? saved;
  String? savedName;

  @override
  Future<String?> saveFile({
    required String suggestedName,
    required Uint8List bytes,
  }) async {
    saved = bytes;
    savedName = suggestedName;
    return '/dev/null/$suggestedName';
  }

  @override
  Future<Uint8List?> pickFileBytes({List<String>? allowedExtensions}) async =>
      null;
}

const _labels = [
  LabelSheetLabel(
    varietyLabel: 'Acelga de Perales',
    commonName: 'Acelga',
    scientificName: 'Beta vulgaris',
    details: '2006 · Perales',
    qrData: 'tane://seed?v=Acelga+de+Perales&y=2006',
  ),
  LabelSheetLabel(
    varietyLabel: 'Alubia de Tolosa',
    qrData: 'tane://seed?v=Alubia+de+Tolosa',
  ),
];

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  for (final format in LabelSheetFormat.values) {
    test('buildPdf renders a well-formed PDF for $format', () async {
      final service = LabelSheetService(files: _RecordingFileService());
      final bytes = await service.buildPdf(labels: _labels, format: format);

      // %PDF header + non-trivial body; text content is compressed, so the
      // human-readable assertions live in the widget/data tests.
      expect(String.fromCharCodes(bytes.take(5)), '%PDF-');
      expect(bytes.length, greaterThan(1000));
    });
  }

  test('buildPdf renders a name-only label (no optional fields)', () async {
    final service = LabelSheetService(files: _RecordingFileService());
    final bytes = await service.buildPdf(
      labels: const [
        LabelSheetLabel(varietyLabel: 'Maíz', qrData: 'tane://seed?v=Maíz'),
      ],
      format: LabelSheetFormat.stickers,
    );
    expect(String.fromCharCodes(bytes.take(5)), '%PDF-');
  });

  test('buildPdf honours an RTL text direction', () async {
    final service = LabelSheetService(files: _RecordingFileService());
    final bytes = await service.buildPdf(
      labels: const [
        LabelSheetLabel(varietyLabel: 'بامية', qrData: 'tane://seed?v=x'),
      ],
      format: LabelSheetFormat.cards,
      rtl: true,
    );
    expect(String.fromCharCodes(bytes.take(5)), '%PDF-');
  });

  test('buildPdf embeds CJK and Arabic glyphs (no tofu)', () async {
    // Japanese (CJK) and Arabic (RTL) fall outside DejaVu's coverage; the Noto
    // fallbacks in the PDF theme must render them without throwing. Guards
    // against a regression that drops the fallback fonts.
    final service = LabelSheetService(files: _RecordingFileService());
    final bytes = await service.buildPdf(
      labels: const [
        LabelSheetLabel(
          varietyLabel: '日本の在来種のトマト',
          commonName: 'トマト',
          scientificName: 'Solanum lycopersicum',
          qrData: 'tane://seed?v=tomato',
        ),
        LabelSheetLabel(varietyLabel: 'طماطم بلدية', qrData: 'tane://seed?v=x'),
      ],
      format: LabelSheetFormat.cards,
    );
    expect(String.fromCharCodes(bytes.take(5)), '%PDF-');
    expect(bytes.length, greaterThan(1000));
  });

  test('saveLabels hands the PDF to the save dialog', () async {
    final files = _RecordingFileService();
    final service = LabelSheetService(files: files);
    final saved = await service.saveLabels(
      labels: _labels,
      format: LabelSheetFormat.cards,
      suggestedName: 'tane-labels-2026-07-10.pdf',
    );

    expect(saved, isTrue);
    expect(files.savedName, 'tane-labels-2026-07-10.pdf');
    expect(String.fromCharCodes(files.saved!.take(5)), '%PDF-');
  });
}