import 'package:shared_preferences/shared_preferences.dart';

/// 自定义表情：服务端 fileId 列表。GIF / 表情面板发出的都走这里。
class StickerStore {
  StickerStore._();
  static const _key = 'im.stickers';
  static SharedPreferences? _p;
  static List<String> _ids = [];

  static List<String> get ids => List.unmodifiable(_ids);

  static Future<void> ensure() async {
    _p ??= await SharedPreferences.getInstance();
    _ids = _p!.getStringList(_key) ?? [];
  }

  static bool has(String fileId) => fileId.isNotEmpty && _ids.contains(fileId);

  static Future<void> add(String fileId) async {
    if (fileId.isEmpty) return;
    await ensure();
    if (_ids.contains(fileId)) return;
    _ids = [fileId, ..._ids];
    await _p!.setStringList(_key, _ids);
  }

  static Future<void> remove(String fileId) async {
    await ensure();
    _ids = _ids.where((e) => e != fileId).toList();
    await _p!.setStringList(_key, _ids);
  }
}