feat: keep undergraduate exams independent of course terms

mobile/lib/domain/exam_schedule.dart

@@ -1,4 +1,5 @@
 import 'dart:convert';
+
 import 'school_identity.dart';
 import 'school_term.dart';
 
@@ -12,12 +13,16 @@ class ExamRecord {
     this.room = '',
     this.seat = '',
     this.time = '',
-    this.date = '', this.status = '', this.notes = '', this.examTypeId,
+    this.date = '',
+    this.status = '',
+    this.notes = '',
+    this.examTypeId,
   });
   final String code, name, assessment, candidate, sequence, room, seat, time;
   final String date, status, notes;
   final int? examTypeId;
-  String get undergraduateKey => jsonEncode([examTypeId,code,date,time,room,seat]);
+  String get undergraduateKey =>
+      jsonEncode([examTypeId, code, date, time, room, seat]);
   Map<String, dynamic> toJson() => {
     'code': code,
     'name': name,
@@ -27,10 +32,13 @@ class ExamRecord {
     'room': room,
     'seat': seat,
     'time': time,
-    'date':date, 'status':status, 'notes':notes, 'examTypeId':examTypeId,
+    'date': date,
+    'status': status,
+    'notes': notes,
+    'examTypeId': examTypeId,
   };
   factory ExamRecord.fromJson(Map<String, dynamic> json) {
-    String field(String key, {bool optional=false}) {
+    String field(String key, {bool optional = false}) {
       final value = optional && !json.containsKey(key) ? '' : json[key];
       if (value is! String || value.length > 1000) {
         throw const FormatException('考试信息无效');
@@ -47,8 +55,10 @@ class ExamRecord {
       room: field('room'),
       seat: field('seat'),
       time: field('time'),
-      date:field('date',optional:true), status:field('status',optional:true), notes:field('notes',optional:true),
-      examTypeId:json['examTypeId'] as int?,
+      date: field('date', optional: true),
+      status: field('status', optional: true),
+      notes: field('notes', optional: true),
+      examTypeId: json['examTypeId'] as int?,
     );
     if (record.code.isEmpty || record.name.isEmpty) {
       throw const FormatException('考试课程无效');
@@ -64,7 +74,8 @@ class ExamSchedule {
     required List<ExamRecord> records,
     this.school = SupportedSchool.uestcGraduate,
     Set<int> requestedExamTypes = const {},
-  }) : records = List.unmodifiable(records), requestedExamTypes=Set.unmodifiable(requestedExamTypes);
+  }) : records = List.unmodifiable(records),
+       requestedExamTypes = Set.unmodifiable(requestedExamTypes);
   final String semesterLabel, termId;
   final List<ExamRecord> records;
   final SupportedSchool school;
@@ -73,36 +84,58 @@ class ExamSchedule {
     'semesterLabel': semesterLabel,
     'termId': termId,
     'records': records.map((r) => r.toJson()).toList(),
-    'schoolId':school.id, 'requestedExamTypes':requestedExamTypes.toList()..sort(),
+    'schoolId': school.id,
+    'requestedExamTypes': requestedExamTypes.toList()..sort(),
   };
   factory ExamSchedule.fromJson(Map<String, dynamic> json) {
     try {
-    final label = json['semesterLabel'],
-        id = json['termId'],
-        rows = json['records'];
-    if (label is! String ||
-        label.trim().isEmpty ||
-        id is! String ||
-        !RegExp(r'^\d+$').hasMatch(id) ||
-        rows is! List ||
-        rows.length > 500) {
+      final label = json['semesterLabel'],
+          id = json['termId'],
+          rows = json['records'];
+      if (label is! String ||
+          label.trim().isEmpty ||
+          id is! String ||
+          !RegExp(r'^\d+$').hasMatch(id) ||
+          rows is! List ||
+          rows.length > 500) {
+        throw const FormatException('考试列表无效');
+      }
+      final records = rows
+          .map((r) => ExamRecord.fromJson(Map<String, dynamic>.from(r as Map)))
+          .toList();
+      final school = json['schoolId'] == null
+          ? SupportedSchool.uestcGraduate
+          : SupportedSchool.fromId(json['schoolId'] as String);
+      final rawTypes = json['requestedExamTypes'] ?? <int>[];
+      if (rawTypes is! List || rawTypes.any((t) => t is! int || t < 1 || t > 3))
+        throw const FormatException('考试类型无效');
+      final types = rawTypes.cast<int>().toSet();
+      SchoolTerm(int.parse(id), school: school);
+      if (school == SupportedSchool.uestcUndergraduate &&
+          (types.isEmpty ||
+              records.any((r) => !types.contains(r.examTypeId)))) {
+        throw const FormatException('本科考试类型无效');
+      }
+      if (records
+              .map(
+                (r) => school == SupportedSchool.uestcGraduate
+                    ? r.code
+                    : r.undergraduateKey,
+              )
+              .toSet()
+              .length !=
+          records.length) {
+        throw const FormatException('考试课程重复');
+      }
+      return ExamSchedule(
+        semesterLabel: label,
+        termId: id,
+        records: records,
+        school: school,
+        requestedExamTypes: types,
+      );
+    } catch (_) {
       throw const FormatException('考试列表无效');
     }
-    final records = rows
-        .map((r) => ExamRecord.fromJson(Map<String, dynamic>.from(r as Map)))
-        .toList();
-    final school=json['schoolId']==null ? SupportedSchool.uestcGraduate : SupportedSchool.fromId(json['schoolId'] as String);
-    final rawTypes=json['requestedExamTypes'] ?? <int>[];
-    if(rawTypes is! List || rawTypes.any((t)=>t is! int || t<1 || t>3)) throw const FormatException('考试类型无效');
-    final types=rawTypes.cast<int>().toSet();
-    SchoolTerm(int.parse(id),school:school);
-    if(school==SupportedSchool.uestcUndergraduate && (types.isEmpty || records.any((r)=>!types.contains(r.examTypeId)))) {
-      throw const FormatException('本科考试类型无效');
-    }
-    if (records.map((r) => school==SupportedSchool.uestcGraduate ? r.code : r.undergraduateKey).toSet().length != records.length) {
-      throw const FormatException('考试课程重复');
-    }
-    return ExamSchedule(semesterLabel: label, termId: id, records: records,school:school,requestedExamTypes:types);
-    } catch (_) { throw const FormatException('考试列表无效'); }
   }
 }