import 'package:flutter/foundation.dart';

/// 全局用户快照；积分等用 [ValueNotifier] 驱动 UI。
class UserState {
  UserState._();

  static final ValueNotifier<String?> userId = ValueNotifier<String?>(null);
  static final ValueNotifier<int> credits = ValueNotifier<int>(0);
  static final ValueNotifier<String?> avatar = ValueNotifier<String?>(null);
  static final ValueNotifier<String?> userName = ValueNotifier<String?>(null);
  static final ValueNotifier<String?> countryCode = ValueNotifier<String?>(null);

  static void setUserId(String? id) => userId.value = id;
  static void setCredits(int v) => credits.value = v;
  static void setAvatar(String? v) => avatar.value = v;
  static void setUserName(String? v) => userName.value = v;
  static void setCountryCode(String? v) => countryCode.value = v;

  static void applyLogin({
    String? userId,
    int? credits,
    String? avatar,
    String? userName,
  }) {
    if (userId != null) UserState.userId.value = userId;
    if (credits != null) UserState.credits.value = credits;
    if (avatar != null) {
      final t = avatar.trim();
      UserState.avatar.value = t.isEmpty ? null : t;
    }
    if (userName != null) UserState.userName.value = userName;
  }

  static void clear() {
    userId.value = null;
    credits.value = 0;
    avatar.value = null;
    userName.value = null;
    countryCode.value = null;
  }
}