// fuel_admin_service.dart — طبقة الاتصال بـ backend/Admin/fuel
//
// ‏محفظة الوقود: السائق يتزوّد بلا نقد، والقيمة تُقيَّد ديناً يُخصم من
// ‏أرباحه. هذه الشاشة تدير المحطات الشريكة وتشغّل المنتج أو توقفه.
import '../functions/crud.dart';
import '../../constant/links.dart';
import 'fuel_admin_models.dart';

class FuelApiResult<T> {
  final bool success;
  final T? data;
  final String message;
  FuelApiResult(this.success, this.data, this.message);
}

class FuelAdminService {
  static String get _base => '${AppLink.server}/Admin/fuel';

  static String _errMsg(dynamic res) {
    if (res == 'no_internet') return 'تحقق من اتصالك بالإنترنت';
    if (res == 'token_expired') return 'انتهت الجلسة، حاول مجدداً';
    if (res is Map && res['message'] is String) return res['message'];
    return 'حدث خطأ، حاول مجدداً';
  }

  static Future<FuelApiResult<FuelStationsPage>> listStations({
    String? search,
    String? city,
    bool onlyActive = false,
  }) async {
    final payload = <String, dynamic>{};
    if (search != null && search.isNotEmpty) payload['search'] = search;
    if (city != null && city.isNotEmpty) payload['city'] = city;
    if (onlyActive) payload['only_active'] = '1';

    final res = await CRUD().post(link: '$_base/list.php', payload: payload);

    if (res is Map && res['status'] == 'success' && res['message'] is Map) {
      return FuelApiResult(
        true,
        FuelStationsPage.fromJson(Map<String, dynamic>.from(res['message'])),
        'ok',
      );
    }
    return FuelApiResult(false, null, _errMsg(res));
  }

  /// ‏يُرجع `api_key` عند الإنشاء فقط — مخزَّن مُهشَّراً على الخادم، فلا
  /// ‏سبيل لعرضه ثانيةً. الشاشة مسؤولة عن إظهاره فوراً وبوضوح.
  static Future<FuelApiResult<Map<String, dynamic>>> saveStation({
    int? stationId,
    required String nameAr,
    String? chainName,
    String? city,
    String? address,
    double? lat,
    double? lng,
    String? phone,
    required double discountPercent,
    required bool isActive,
  }) async {
    final res = await CRUD().post(link: '$_base/save.php', payload: {
      if (stationId != null) 'station_id': stationId.toString(),
      'name_ar': nameAr,
      if (chainName != null && chainName.isNotEmpty) 'chain_name': chainName,
      if (city != null && city.isNotEmpty) 'city': city,
      if (address != null && address.isNotEmpty) 'address': address,
      if (lat != null) 'lat': lat.toString(),
      if (lng != null) 'lng': lng.toString(),
      if (phone != null && phone.isNotEmpty) 'phone': phone,
      'discount_percent': discountPercent.toString(),
      'is_active': isActive ? '1' : '0',
    });

    if (res is Map && res['status'] == 'success') {
      return FuelApiResult(
        true,
        Map<String, dynamic>.from(res['message'] ?? {}),
        res['message'] is Map ? 'ok' : (res['message']?.toString() ?? 'ok'),
      );
    }
    return FuelApiResult(false, null, _errMsg(res));
  }

  static Future<FuelApiResult<Map<String, dynamic>>> rotateKey(int stationId) async {
    final res = await CRUD().post(
      link: '$_base/rotate_key.php',
      payload: {'station_id': stationId.toString()},
    );
    if (res is Map && res['status'] == 'success' && res['message'] is Map) {
      return FuelApiResult(true, Map<String, dynamic>.from(res['message']), 'ok');
    }
    return FuelApiResult(false, null, _errMsg(res));
  }

  static Future<FuelApiResult<bool>> toggleProduct(bool isActive) async {
    final res = await CRUD().post(
      link: '$_base/toggle_product.php',
      payload: {'is_active': isActive ? '1' : '0'},
    );
    if (res is Map && res['status'] == 'success' && res['message'] is Map) {
      return FuelApiResult(
          true, res['message']['product_active'] == true, 'ok');
    }
    return FuelApiResult(false, null, _errMsg(res));
  }

  static Future<FuelApiResult<FuelDrawdownsPage>> listDrawdowns({
    int? stationId,
    String? status,
  }) async {
    final payload = <String, dynamic>{};
    if (stationId != null) payload['station_id'] = stationId.toString();
    if (status != null && status.isNotEmpty) payload['status'] = status;

    final res = await CRUD().post(link: '$_base/drawdowns.php', payload: payload);

    if (res is Map && res['status'] == 'success' && res['message'] is Map) {
      return FuelApiResult(
        true,
        FuelDrawdownsPage.fromJson(Map<String, dynamic>.from(res['message'])),
        'ok',
      );
    }
    return FuelApiResult(false, null, _errMsg(res));
  }
}