import 'package:flutter_riverpod/flutter_riverpod.dart';

import '../models/user_profile.dart';
import '../models/video_item.dart';
import '../services/user_service.dart';

/// 他人主页状态
class ProfileState {
  const ProfileState({
    this.profile,
    this.works = const [],
    this.worksTotal = 0,
    this.isLoading = false,
    this.loadFailed = false,
  });

  final UserPublicProfile? profile;
  final List<VideoItem> works;
  final int worksTotal;
  final bool isLoading;
  final bool loadFailed;

  ProfileState copyWith({
    UserPublicProfile? profile,
    List<VideoItem>? works,
    int? worksTotal,
    bool? isLoading,
    bool? loadFailed,
  }) =>
      ProfileState(
        profile: profile ?? this.profile,
        works: works ?? this.works,
        worksTotal: worksTotal ?? this.worksTotal,
        isLoading: isLoading ?? this.isLoading,
        loadFailed: loadFailed ?? this.loadFailed,
      );
}

/// 他人主页 Notifier：主页信息 + 已发布作品（一期一次拉 50 条，不做分页加载）
class ProfileNotifier extends StateNotifier<ProfileState> {
  ProfileNotifier(this.userId) : super(const ProfileState()) {
    load();
  }

  final int userId;

  Future<void> load() async {
    state = state.copyWith(isLoading: true, loadFailed: false);
    try {
      final profile = await UserService.fetchPublicProfile(userId);
      final works = await UserService.fetchUserVideos(userId);
      state = state.copyWith(
        profile: profile,
        works: works.items,
        worksTotal: works.total,
        isLoading: false,
      );
    } catch (_) {
      state = state.copyWith(isLoading: false, loadFailed: true);
    }
  }
}

final profileProvider =
    StateNotifierProvider.family<ProfileNotifier, ProfileState, int>(
  (ref, userId) => ProfileNotifier(userId),
);

/// 我的作品（需登录，一期一次拉 50 条）
final myVideosProvider = FutureProvider.autoDispose<PagedVideos>(
  (ref) => UserService.fetchMyVideos(),
);

/// 我的收藏（需登录）
final myFavoritesProvider = FutureProvider.autoDispose<PagedVideos>(
  (ref) => UserService.fetchMyFavorites(),
);

/// 观看历史（需登录）
final myHistoryProvider = FutureProvider.autoDispose<List<HistoryItem>>(
  (ref) => UserService.fetchMyHistory(),
);