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sjk
267
client/lib/features/writing/models/writing_task.dart
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267
client/lib/features/writing/models/writing_task.dart
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class WritingTask {
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final String id;
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final String title;
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final String description;
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final WritingType type;
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final WritingDifficulty difficulty;
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final int timeLimit; // 分钟
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final int wordLimit;
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final List<String> keywords;
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final List<String> requirements;
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final String? prompt;
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final String? imageUrl;
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final ExamType? examType; // 考试类型
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final DateTime createdAt;
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final DateTime? updatedAt;
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const WritingTask({
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required this.id,
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required this.title,
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required this.description,
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required this.type,
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required this.difficulty,
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required this.timeLimit,
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required this.wordLimit,
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required this.keywords,
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required this.requirements,
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this.prompt,
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this.imageUrl,
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this.examType,
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required this.createdAt,
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this.updatedAt,
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});
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factory WritingTask.fromJson(Map<String, dynamic> json) {
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final idVal = json['id'] ?? json['prompt_id'];
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final typeVal = json['type'];
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final difficultyVal = json['difficulty'];
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final timeLimitVal = json['timeLimit'] ?? json['time_limit'];
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final wordLimitVal = json['wordLimit'] ?? json['word_limit'];
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final examTypeVal = json['examType'] ?? json['exam_type'];
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final createdAtVal = json['createdAt'] ?? json['created_at'];
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final updatedAtVal = json['updatedAt'] ?? json['updated_at'];
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return WritingTask(
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id: (idVal ?? '').toString(),
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title: (json['title'] ?? '').toString(),
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description: (json['description'] ?? '').toString(),
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type: typeVal is String
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? WritingType.values.firstWhere(
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(e) => e.name == typeVal,
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orElse: () => WritingType.essay,
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)
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: WritingType.essay,
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difficulty: difficultyVal is String
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? WritingDifficulty.values.firstWhere(
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(e) => e.name == difficultyVal,
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orElse: () => WritingDifficulty.intermediate,
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)
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: WritingDifficulty.intermediate,
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timeLimit: _asInt(timeLimitVal),
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wordLimit: _asInt(wordLimitVal),
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keywords: List<String>.from(json['keywords'] ?? []),
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requirements: List<String>.from(json['requirements'] ?? []),
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prompt: json['prompt'] as String?,
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imageUrl: json['imageUrl'] as String?,
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examType: examTypeVal is String
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? ExamType.values.firstWhere(
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(e) => e.name == examTypeVal,
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orElse: () => ExamType.cet,
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)
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: null,
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createdAt: _parseDate(createdAtVal),
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updatedAt: updatedAtVal != null ? _parseDate(updatedAtVal) : null,
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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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'title': title,
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'description': description,
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'type': type.name,
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'difficulty': difficulty.name,
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'timeLimit': timeLimit,
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'wordLimit': wordLimit,
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'keywords': keywords,
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'requirements': requirements,
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'prompt': prompt,
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'imageUrl': imageUrl,
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'examType': examType?.name,
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'createdAt': createdAt.toIso8601String(),
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'updatedAt': updatedAt?.toIso8601String(),
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};
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}
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WritingTask copyWith({
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String? id,
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String? title,
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String? description,
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WritingType? type,
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WritingDifficulty? difficulty,
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int? timeLimit,
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int? wordLimit,
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List<String>? keywords,
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List<String>? requirements,
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String? prompt,
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String? imageUrl,
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ExamType? examType,
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DateTime? createdAt,
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DateTime? updatedAt,
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}) {
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return WritingTask(
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id: id ?? this.id,
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title: title ?? this.title,
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description: description ?? this.description,
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type: type ?? this.type,
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difficulty: difficulty ?? this.difficulty,
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timeLimit: timeLimit ?? this.timeLimit,
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wordLimit: wordLimit ?? this.wordLimit,
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keywords: keywords ?? this.keywords,
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requirements: requirements ?? this.requirements,
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prompt: prompt ?? this.prompt,
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imageUrl: imageUrl ?? this.imageUrl,
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examType: examType ?? this.examType,
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createdAt: createdAt ?? this.createdAt,
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updatedAt: updatedAt ?? this.updatedAt,
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);
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}
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}
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enum WritingType {
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essay,
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letter,
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email,
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report,
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story,
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review,
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article,
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diary,
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description,
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argument,
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}
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enum WritingDifficulty {
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beginner,
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elementary,
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intermediate,
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upperIntermediate,
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advanced,
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}
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extension WritingTypeExtension on WritingType {
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String get displayName {
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switch (this) {
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case WritingType.essay:
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return '议论文';
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case WritingType.letter:
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return '书信';
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case WritingType.email:
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return '邮件';
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case WritingType.report:
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return '报告';
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case WritingType.story:
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return '故事';
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case WritingType.review:
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return '评论';
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case WritingType.article:
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return '文章';
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case WritingType.diary:
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return '日记';
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case WritingType.description:
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return '描述文';
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case WritingType.argument:
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return '辩论文';
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}
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}
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}
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extension WritingDifficultyExtension on WritingDifficulty {
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String get displayName {
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switch (this) {
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case WritingDifficulty.beginner:
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return '初级';
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case WritingDifficulty.elementary:
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return '基础';
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case WritingDifficulty.intermediate:
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return '中级';
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case WritingDifficulty.upperIntermediate:
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return '中高级';
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case WritingDifficulty.advanced:
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return '高级';
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}
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}
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int get level {
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switch (this) {
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case WritingDifficulty.beginner:
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return 1;
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case WritingDifficulty.elementary:
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return 2;
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case WritingDifficulty.intermediate:
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return 3;
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case WritingDifficulty.upperIntermediate:
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return 4;
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case WritingDifficulty.advanced:
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return 5;
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}
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}
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}
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enum ExamType {
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cet, // 四六级
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kaoyan, // 考研
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toefl, // 托福
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ielts, // 雅思
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}
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extension ExamTypeExtension on ExamType {
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String get displayName {
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switch (this) {
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case ExamType.cet:
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return '四六级';
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case ExamType.kaoyan:
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return '考研';
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case ExamType.toefl:
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return '托福';
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case ExamType.ielts:
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return '雅思';
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}
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}
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String get description {
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switch (this) {
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case ExamType.cet:
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return '大学英语四六级考试写作';
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case ExamType.kaoyan:
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return '研究生入学考试英语写作';
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case ExamType.toefl:
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return 'TOEFL托福考试写作';
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case ExamType.ielts:
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return 'IELTS雅思考试写作';
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}
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}
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}
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int _asInt(dynamic v) {
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if (v == null) return 0;
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if (v is int) return v;
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if (v is num) return v.toInt();
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if (v is String) {
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final parsed = double.tryParse(v);
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return parsed?.toInt() ?? int.tryParse(v) ?? 0;
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}
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return 0;
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}
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DateTime _parseDate(dynamic v) {
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if (v is String) {
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try {
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return DateTime.parse(v);
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} catch (_) {}
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}
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if (v is int) {
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return DateTime.fromMillisecondsSinceEpoch(v);
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}
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return DateTime.now();
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}
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