import 'package:new_learn/core/api/lexicon/model.dart';
import 'package:new_learn/core/network/dio_client.dart';

/// ============================================================
/// 【lexicon 模块接口】背单词接口 —— 对标 Vue3 端 api/lexicon/index.ts
///
///   getChapters      → GET  GetChapters/{bookId}        章节列表
///   getLevels        → GET  GetLevels/{chapterId}       关卡列表
///   levelStart       → POST LevelStart/{levelId}        开局取题
///   answerQuestion   → POST Answer                      提交答案
///   getLevelIsFinish → GET  GetLevelIsFinish/{levelId}  关卡是否完成（轮询）
///   getLevelOverInfo → GET  GetLevelOverInfo/{userLevelId} 闯关小结
///
/// 注意：getChapters Vue 端带 hideErrorToast，toast 由页面自行处理；
/// 异常统一向上抛，页面 catch 后决定提示。
/// ============================================================
class LexiconApi {
  LexiconApi._();

  static final LexiconApi instance = LexiconApi._();

  /// 后端响应壳 {code, message, data} 统一取 data（用于裸值响应）
  dynamic _unwrap(dynamic data) =>
      data is Map<String, dynamic> && data['data'] != null
      ? data['data']
      : data;

  /// 章节列表（model 内部兼容响应壳）
  Future<ChapterResponse> getChapters(int bookId) async {
    final data = await DioClient.instance.get(
      '/api/v1/Lexicon/GetChapters/$bookId',
    );
    return ChapterResponse.fromJson(data as Map<String, dynamic>);
  }

  /// 关卡列表
  Future<LevelResponse> getLevels(int chapterId) async {
    final data = await DioClient.instance.get(
      '/api/v1/Lexicon/GetLevels/$chapterId',
    );
    return LevelResponse.fromJson(data as Map<String, dynamic>);
  }

  /// 开局取题
  Future<LevelStartInfo> levelStart(int levelId) async {
    final data = await DioClient.instance.post(
      '/api/v1/Lexicon/LevelStart/$levelId',
    );
    return LevelStartInfo.fromJson(data as Map<String, dynamic>);
  }

  /// 提交答案（返回值与开局信息同构，但页面只关心成功与否）
  Future<bool> answerQuestion({
    required int levelId,
    required int userLevelId,
    required int lexiconId,
    required String answer,
  }) async {
    final data = await DioClient.instance.post(
      '/api/v1/Lexicon/Answer',
      data: {
        'levelId': levelId,
        'userLevelId': userLevelId,
        'lexiconId': lexiconId,
        'answer': answer,
      },
    );
    return data != null;
  }

  /// 关卡是否完成（完关后后端有短暂处理延迟，需轮询）
  Future<bool> getLevelIsFinish(int levelId) async {
    final data = _unwrap(
      await DioClient.instance.get('/api/v1/Lexicon/GetLevelIsFinish/$levelId'),
    );
    return data == true;
  }

  /// 闯关小结
  Future<LevelOverInfo> getLevelOverInfo(int userLevelId) async {
    final data = await DioClient.instance.get(
      '/api/v1/Lexicon/GetLevelOverInfo/$userLevelId',
    );
    return LevelOverInfo.fromJson(data as Map<String, dynamic>);
  }
}