part of 'traction.dart';

extension _TractionPersistence on _TractionPageState {
  Future<void> _restoreSearchState() async {
    if (widget.selectionMode) return;
    if (_restoredFromPrefs) return;
    _restoredFromPrefs = true;
    try {
      final prefs = await SharedPreferences.getInstance();
      final raw = prefs.getString(_kTractionSearchPrefsKey);
      if (raw == null || raw.trim().isEmpty) return;
      final decoded = jsonDecode(raw);
      if (decoded is! Map) return;

      final classText = decoded['classText']?.toString();
      final numberText = decoded['number']?.toString();
      final nameText = decoded['name']?.toString();
      final selectedClass = decoded['selectedClass']?.toString();
      final mileageFirst = decoded['mileageFirst'];
      final showAdvanced = decoded['showAdvancedFilters'];

      if (classText != null) _classController.text = classText;
      if (numberText != null) _numberController.text = numberText;
      if (nameText != null) _nameController.text = nameText;

      final dynamicValues = <String, String>{};
      final enumValues = <String, String?>{};
      final dynamicRaw = decoded['dynamic'];
      if (dynamicRaw is Map) {
        for (final entry in dynamicRaw.entries) {
          final key = entry.key.toString();
          final val = entry.value?.toString() ?? '';
          dynamicValues[key] = val;
        }
      }
      final enumRaw = decoded['enum'];
      if (enumRaw is Map) {
        for (final entry in enumRaw.entries) {
          enumValues[entry.key.toString()] = entry.value?.toString();
        }
      }

      for (final entry in dynamicValues.entries) {
        _dynamicControllers.putIfAbsent(
          entry.key,
          () => TextEditingController(text: entry.value),
        );
        _dynamicControllers[entry.key]?.text = entry.value;
      }
      for (final entry in enumValues.entries) {
        _enumSelections[entry.key] = entry.value;
      }

      if (!mounted) return;
      _setState(() {
        _selectedClass =
            (selectedClass != null && selectedClass.trim().isNotEmpty)
                ? selectedClass
                : null;
        if (mileageFirst is bool) _mileageFirst = mileageFirst;
        if (showAdvanced is bool) _showAdvancedFilters = showAdvanced;
      });
    } catch (_) {
      // Ignore preference restore failures.
    }
  }

  Future<void> _persistSearchState() async {
    if (widget.selectionMode) return;
    final payload = <String, dynamic>{
      'classText': _classController.text,
      'number': _numberController.text,
      'name': _nameController.text,
      'selectedClass': _selectedClass,
      'mileageFirst': _mileageFirst,
      'showAdvancedFilters': _showAdvancedFilters,
      'dynamic': _dynamicControllers.map((k, v) => MapEntry(k, v.text)),
      'enum': _enumSelections,
    };

    try {
      final prefs = await SharedPreferences.getInstance();
      await prefs.setString(_kTractionSearchPrefsKey, jsonEncode(payload));
    } catch (_) {
      // Ignore persistence failures.
    }
  }
}