getGpa method

Implementation

@override
Future<List<GpaDto>> getGpa() async {
  final response = await _studentQueryDio.get('QryGPA.jsp');
  final document = parse(response.data);

  final semesterPattern = RegExp(r'(\d{2,4})\s*[-－–—]\s*([12])');
  final gpaPattern = RegExp(r'\d+(?:\.\d+)?');

  final results = <GpaDto>[];
  final seen = <String>{};

  for (final row in document.querySelectorAll('tr').skip(1)) {
    final cells = row.querySelectorAll('td');
    if (cells.length < 2) continue;

    final semesterContainer = cells[0].querySelector('div') ?? cells[0];
    final semesterText = semesterContainer.nodes
        .where((node) => node.nodeType == Node.TEXT_NODE)
        .map((node) => node.text?.trim() ?? '')
        .firstWhere((text) => text.isNotEmpty, orElse: () => '');
    final semesterMatch = semesterPattern.firstMatch(semesterText);
    if (semesterMatch == null) continue;

    final year = int.parse(semesterMatch.group(1)!);
    final term = int.parse(semesterMatch.group(2)!);

    final gpaText = cells[1].text.trim();
    final gpaMatch = gpaPattern.firstMatch(gpaText);
    final grandTotalGpa = gpaMatch != null
        ? double.tryParse(gpaMatch.group(0)!)
        : null;
    if (grandTotalGpa == null) continue;

    final key = '$year-$term';
    if (!seen.add(key)) continue;

    results.add((
      semester: (year: year, term: term),
      grandTotalGpa: grandTotalGpa,
    ));
  }

  results.sort((a, b) {
    final yearCompare = b.semester.year!.compareTo(a.semester.year!);
    if (yearCompare != 0) return yearCompare;
    return b.semester.term!.compareTo(a.semester.term!);
  });
  return results;
}