import 'dart:convert';
import 'package:shared_preferences/shared_preferences.dart';
import '../models/history_item.dart';

class HistoryService {
  static const _key = 'translation_history';
  static const _maxItems = 200;

  Future<List<HistoryItem>> getAll() async {
    final prefs = await SharedPreferences.getInstance();
    final raw = prefs.getStringList(_key) ?? [];
    return raw
        .map((s) => HistoryItem.fromJson(jsonDecode(s) as Map<String, dynamic>))
        .toList()
        .reversed
        .toList(); // en yeni en üstte
  }

  Future<void> add(HistoryItem item) async {
    final prefs = await SharedPreferences.getInstance();
    final raw = prefs.getStringList(_key) ?? [];
    raw.add(jsonEncode(item.toJson()));
    final trimmed = raw.length > _maxItems
        ? raw.sublist(raw.length - _maxItems)
        : raw;
    await prefs.setStringList(_key, trimmed);
  }

  Future<void> clear() async {
    final prefs = await SharedPreferences.getInstance();
    await prefs.remove(_key);
  }
}