import 'dart:convert';

import 'package:yumi/shared/data_sources/sources/local/data_persistence.dart';
import 'package:yumi/shared/data_sources/sources/local/user_manager.dart';

class RoomBackgroundHistory {
  static const int _maxCount = 30;
  static const String _prefix = "room_background_history";

  static String get _key {
    final userId =
        AccountStorage().getCurrentUser()?.userProfile?.id ?? "guest";
    return "${_prefix}_$userId";
  }

  static List<String> load() {
    final raw = DataPersistence.getString(_key);
    if (raw.trim().isEmpty) {
      return [];
    }
    try {
      final decoded = jsonDecode(raw);
      if (decoded is List) {
        return decoded
            .map((item) => item?.toString().trim() ?? "")
            .where((item) => item.isNotEmpty)
            .toSet()
            .toList();
      }
    } catch (_) {}
    return [];
  }

  static Future<void> add(String imageUrl) async {
    final normalized = imageUrl.trim();
    if (normalized.isEmpty) {
      return;
    }
    final next =
        load()
          ..removeWhere((item) => item == normalized)
          ..insert(0, normalized);
    if (next.length > _maxCount) {
      next.removeRange(_maxCount, next.length);
    }
    await DataPersistence.setString(_key, jsonEncode(next));
  }
}