import 'school_identity.dart';
import 'school_term.dart';
import 'exam_schedule.dart';

enum UndergraduateExamType {
  finalExam(1, '期末考试'),
  midterm(2, '期中考试'),
  makeup(3, '补考/缓考');

  const UndergraduateExamType(this.id, this.label);
  final int id;
  final String label;
  static UndergraduateExamType fromId(int id) => values.firstWhere(
    (t) => t.id == id,
    orElse: () => throw const FormatException('考试类型无效'),
  );
}

class UndergraduateExamQuery {
  UndergraduateExamQuery({
    required this.term,
    required Set<UndergraduateExamType> types,
  }) : types = Set.unmodifiable(types) {
    if (term.school != SupportedSchool.uestcUndergraduate || types.isEmpty) {
      throw ArgumentError('请选择本科学期和考试类型');
    }
  }
  final SchoolTerm term;
  final Set<UndergraduateExamType> types;
  List<UndergraduateExamType> get orderedTypes =>
      UndergraduateExamType.values.where(types.contains).toList();
  Uri uriFor(UndergraduateExamType type) {
    if (!types.contains(type)) throw ArgumentError('考试类型不在查询选项中');
    return Uri.https(
      'eams.uestc.edu.cn',
      '/eams/stdExamTable!examTable.action',
      {'semester.id': '${term.id}', 'examType.id': '${type.id}'},
    );
  }

  static UndergraduateExamQuery? fromSchedule(ExamSchedule? schedule) {
    if (schedule?.school != SupportedSchool.uestcUndergraduate) return null;
    return UndergraduateExamQuery(
      term: SchoolTerm(int.parse(schedule!.termId), school: schedule.school),
      types: schedule.requestedExamTypes
          .map(UndergraduateExamType.fromId)
          .toSet(),
    );
  }
}