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());
  }
}