import 'package:dio/dio.dart';

import '../core/network/api_client.dart';
import '../core/network/endpoints.dart';
import '../models/user_model.dart';
import '../models/user_profile.dart';
import '../models/video_item.dart';

/// 用户服务（《03-接口文档》第 4 章 + 6.6/6.7）
class UserService {
  UserService._();

  /// 4.1 获取个人信息
  static Future<UserModel> fetchMe() async {
    final data = await ApiClient.get<Map<String, dynamic>>(Endpoints.me);
    return UserModel.fromJson(data);
  }

  /// 4.2 修改资料（返回更新后的完整用户对象）
  static Future<UserModel> updateMe({
    String? nickname,
    String? bio,
    int? gender,
  }) async {
    final data = await ApiClient.put<Map<String, dynamic>>(
      Endpoints.me,
      data: {
        if (nickname != null) 'nickname': nickname,
        if (bio != null) 'bio': bio,
        if (gender != null) 'gender': gender,
      },
    );
    return UserModel.fromJson(data);
  }

  /// 4.3 上传头像（multipart，字段名 file；仅支持 jpg/png，≤5MB）
  static Future<String> uploadAvatar({
    required String filePath,
    required String fileName,
  }) async {
    final data = await ApiClient.post<Map<String, dynamic>>(
      Endpoints.meAvatar,
      data: FormData.fromMap({
        'file': await MultipartFile.fromFile(filePath, filename: fileName),
      }),
    );
    return (data['avatar_url'] as String?) ?? '';
  }

  /// 4.7 用户公开主页（游客可）
  static Future<UserPublicProfile> fetchPublicProfile(int userId) async {
    final data =
        await ApiClient.get<Map<String, dynamic>>(Endpoints.userDetail(userId));
    return UserPublicProfile.fromJson(data);
  }

  /// 4.8 他人作品列表（仅已发布）
  static Future<PagedVideos> fetchUserVideos(
    int userId, {
    int page = 1,
    int pageSize = 50,
  }) =>
      _fetchVideos(Endpoints.userVideos(userId), page: page, pageSize: pageSize);

  /// 我的作品（需登录，含各状态）
  static Future<PagedVideos> fetchMyVideos({
    int page = 1,
    int pageSize = 50,
  }) =>
      _fetchVideos(Endpoints.meVideos, page: page, pageSize: pageSize);

  /// 6.6 我的收藏（需登录）
  static Future<PagedVideos> fetchMyFavorites({
    int page = 1,
    int pageSize = 50,
  }) =>
      _fetchVideos(Endpoints.meFavorites, page: page, pageSize: pageSize);

  /// 6.7 观看历史（需登录）：video + watched_at + cost_type
  static Future<List<HistoryItem>> fetchMyHistory({
    int page = 1,
    int pageSize = 50,
  }) async {
    final data = await ApiClient.get<Map<String, dynamic>>(
      Endpoints.meHistory,
      queryParameters: {'page': page, 'page_size': pageSize},
    );
    return ((data['list'] as List?) ?? const [])
        .whereType<Map<String, dynamic>>()
        .map(HistoryItem.fromJson)
        .toList();
  }

  static Future<PagedVideos> _fetchVideos(
    String path, {
    required int page,
    required int pageSize,
  }) async {
    final data = await ApiClient.get<Map<String, dynamic>>(
      path,
      queryParameters: {'page': page, 'page_size': pageSize},
    );
    return PagedVideos(
      total: (data['total'] as num?)?.toInt() ?? 0,
      items: ((data['list'] as List?) ?? const [])
          .whereType<Map<String, dynamic>>()
          .map(VideoItem.fromJson)
          .toList(),
    );
  }
}

/// 视频分页结果（普通 page/page_size 分页）
class PagedVideos {
  PagedVideos({required this.total, required this.items});

  final int total;
  final List<VideoItem> items;
}