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sjk
241
client/lib/features/reading/models/reading_question.dart
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241
client/lib/features/reading/models/reading_question.dart
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enum QuestionType {
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multipleChoice,
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trueFalse,
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fillInBlank,
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shortAnswer,
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}
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class ReadingQuestion {
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final String id;
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final String articleId;
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final QuestionType type;
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final String question;
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final List<String> options; // For multiple choice questions
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final String correctAnswer;
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final String explanation;
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final int order;
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final String? userAnswer;
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final bool? isCorrect;
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const ReadingQuestion({
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required this.id,
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required this.articleId,
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required this.type,
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required this.question,
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required this.options,
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required this.correctAnswer,
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required this.explanation,
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required this.order,
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this.userAnswer,
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this.isCorrect,
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});
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factory ReadingQuestion.fromJson(Map<String, dynamic> json) {
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return ReadingQuestion(
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id: json['id'] as String,
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articleId: json['articleId'] as String,
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type: QuestionType.values.firstWhere(
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(e) => e.toString().split('.').last == json['type'],
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orElse: () => QuestionType.multipleChoice,
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),
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question: json['question'] as String,
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options: List<String>.from(json['options'] as List? ?? []),
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correctAnswer: json['correctAnswer'] as String,
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explanation: json['explanation'] as String,
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order: json['order'] as int,
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userAnswer: json['userAnswer'] as String?,
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isCorrect: json['isCorrect'] as bool?,
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);
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}
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Map<String, dynamic> toJson() {
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return {
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'id': id,
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'articleId': articleId,
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'type': type.toString().split('.').last,
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'question': question,
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'options': options,
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'correctAnswer': correctAnswer,
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'explanation': explanation,
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'order': order,
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'userAnswer': userAnswer,
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'isCorrect': isCorrect,
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};
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}
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ReadingQuestion copyWith({
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String? id,
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String? articleId,
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QuestionType? type,
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String? question,
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List<String>? options,
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String? correctAnswer,
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String? explanation,
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int? order,
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String? userAnswer,
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bool? isCorrect,
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}) {
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return ReadingQuestion(
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id: id ?? this.id,
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articleId: articleId ?? this.articleId,
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type: type ?? this.type,
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question: question ?? this.question,
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options: options ?? this.options,
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correctAnswer: correctAnswer ?? this.correctAnswer,
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explanation: explanation ?? this.explanation,
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order: order ?? this.order,
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userAnswer: userAnswer ?? this.userAnswer,
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isCorrect: isCorrect ?? this.isCorrect,
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);
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}
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String get typeLabel {
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switch (type) {
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case QuestionType.multipleChoice:
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return '选择题';
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case QuestionType.trueFalse:
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return '判断题';
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case QuestionType.fillInBlank:
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return '填空题';
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case QuestionType.shortAnswer:
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return '简答题';
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}
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}
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}
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class ReadingExercise {
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final String id;
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final String articleId;
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final List<ReadingQuestion> questions;
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final DateTime? startTime;
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final DateTime? endTime;
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final double? score;
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final bool isCompleted;
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const ReadingExercise({
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required this.id,
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required this.articleId,
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required this.questions,
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this.startTime,
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this.endTime,
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this.score,
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this.isCompleted = false,
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});
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factory ReadingExercise.fromJson(Map<String, dynamic> json) {
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return ReadingExercise(
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id: json['id'] as String,
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articleId: json['articleId'] as String,
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questions: (json['questions'] as List)
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.map((q) => ReadingQuestion.fromJson(q as Map<String, dynamic>))
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.toList(),
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startTime: json['startTime'] != null
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? DateTime.parse(json['startTime'] as String)
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: null,
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endTime: json['endTime'] != null
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? DateTime.parse(json['endTime'] as String)
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: null,
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score: json['score'] as double?,
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isCompleted: json['isCompleted'] as bool? ?? false,
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);
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}
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Map<String, dynamic> toJson() {
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return {
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'id': id,
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'articleId': articleId,
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'questions': questions.map((q) => q.toJson()).toList(),
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'startTime': startTime?.toIso8601String(),
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'endTime': endTime?.toIso8601String(),
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'score': score,
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'isCompleted': isCompleted,
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};
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}
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ReadingExercise copyWith({
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String? id,
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String? articleId,
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List<ReadingQuestion>? questions,
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DateTime? startTime,
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DateTime? endTime,
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double? score,
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bool? isCompleted,
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}) {
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return ReadingExercise(
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id: id ?? this.id,
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articleId: articleId ?? this.articleId,
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questions: questions ?? this.questions,
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startTime: startTime ?? this.startTime,
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endTime: endTime ?? this.endTime,
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score: score ?? this.score,
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isCompleted: isCompleted ?? this.isCompleted,
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);
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}
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int get totalQuestions => questions.length;
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int get answeredQuestions {
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return questions.where((q) => q.userAnswer != null).length;
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}
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int get correctAnswers {
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return questions.where((q) => q.isCorrect == true).length;
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}
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double get progressPercentage {
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if (totalQuestions == 0) return 0.0;
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return (answeredQuestions / totalQuestions) * 100;
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}
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Duration? get duration {
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if (startTime != null && endTime != null) {
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return endTime!.difference(startTime!);
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}
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return null;
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}
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}
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/// 阅读练习结果
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class ReadingExerciseResult {
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final double score;
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final int correctCount;
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final int totalCount;
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final Duration timeSpent; // 用时
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final double accuracy;
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const ReadingExerciseResult({
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required this.score,
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required this.correctCount,
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required this.totalCount,
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required this.timeSpent,
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required this.accuracy,
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});
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/// 错误题数
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int get wrongCount => totalCount - correctCount;
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/// 总题数（别名）
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int get totalQuestions => totalCount;
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factory ReadingExerciseResult.fromJson(Map<String, dynamic> json) {
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return ReadingExerciseResult(
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score: (json['score'] as num).toDouble(),
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correctCount: json['correctCount'] as int,
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totalCount: json['totalCount'] as int,
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timeSpent: Duration(seconds: json['timeSpent'] as int),
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accuracy: (json['accuracy'] as num).toDouble(),
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);
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}
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Map<String, dynamic> toJson() {
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return {
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'score': score,
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'correctCount': correctCount,
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'totalCount': totalCount,
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'timeSpent': timeSpent.inSeconds,
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'accuracy': accuracy,
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};
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}
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bool get isPassed => score >= 60.0;
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}
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