// transit_service.dart — طبقة الاتصال بـ backend/transit (جهة الراكب)
import '../functions/crud.dart';
import '../../constant/links.dart';
import 'transit_models.dart';

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

class TransitService {
  static String get _base => '${AppLink.server}/transit';

  /// تصفح المؤسسات المتاحة للتفعيل (قبل الانضمام)
  static Future<TransitApiResult<List<TransitOrg>>> browseOrgs({
    String? country,
    String? search,
  }) async {
    final payload = <String, dynamic>{};
    if (country != null) payload['country'] = country;
    if (search != null && search.isNotEmpty) payload['search'] = search;

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

    if (res is Map && res['status'] == 'success') {
      final msg = res['message'];
      final list = (msg is Map && msg['orgs'] is List)
          ? (msg['orgs'] as List)
              .map((o) => TransitOrg.fromJson(Map<String, dynamic>.from(o)))
              .toList()
          : <TransitOrg>[];
      return TransitApiResult(true, list, 'ok');
    }
    return TransitApiResult(false, null, _errMsg(res));
  }

  /// تفعيل عضوية الراكب في مؤسسة بالرقم الجامعي/الوظيفي
  static Future<TransitApiResult<TransitEnrollment>> activateEnrollment({
    required int orgId,
    required String studentId,
  }) async {
    final res = await CRUD().post(
      link: '$_base/enrollment/activate.php',
      payload: {'org_id': orgId.toString(), 'student_id': studentId},
    );

    if (res is Map && res['status'] == 'success') {
      final msg = res['message'];
      if (msg is Map<String, dynamic>) {
        return TransitApiResult(
          true,
          TransitEnrollment.fromActivateResponse(msg, orgId),
          msg['message']?.toString() ?? 'تم',
        );
      }
    }
    return TransitApiResult(false, null, _errMsg(res));
  }

  /// عضوياتي في كل المؤسسات
  static Future<TransitApiResult<List<TransitEnrollment>>>
      getMyEnrollments() async {
    final res = await CRUD().post(link: '$_base/enrollment/my_enrollments.php');

    if (res is Map && res['status'] == 'success') {
      final msg = res['message'];
      final list = (msg is Map && msg['enrollments'] is List)
          ? (msg['enrollments'] as List)
              .map((e) => TransitEnrollment(
                    id: int.tryParse(e['id'].toString()) ?? 0,
                    orgId: int.tryParse(e['org_id'].toString()) ?? 0,
                    orgName: e['org_name']?.toString() ?? '',
                    status: e['status']?.toString() ?? '',
                    verifyMethod: e['verify_method']?.toString() ?? '',
                  ))
              .toList()
          : <TransitEnrollment>[];
      return TransitApiResult(true, list, 'ok');
    }
    return TransitApiResult(false, null, _errMsg(res));
  }

  /// خطوط مؤسسة معيّنة (يشترط عضوية نشطة)
  static Future<TransitApiResult<List<TransitRouteSummary>>> getRoutesForOrg(
      int orgId) async {
    final res = await CRUD().post(
      link: '$_base/route/for_org.php',
      payload: {'org_id': orgId.toString()},
    );

    if (res is Map && res['status'] == 'success') {
      final msg = res['message'];
      final list = (msg is Map && msg['routes'] is List)
          ? (msg['routes'] as List)
              .map((r) => TransitRouteSummary.fromJson(
                  Map<String, dynamic>.from(r)))
              .toList()
          : <TransitRouteSummary>[];
      return TransitApiResult(true, list, 'ok');
    }
    return TransitApiResult(false, null, _errMsg(res));
  }

  /// تفاصيل الرحلة الحية لخط (المحطات + آخر موقع معروف)
  static Future<TransitApiResult<Map<String, dynamic>>> getLiveTrip({
    int? tripId,
    int? routeId,
  }) async {
    final payload = <String, dynamic>{};
    if (tripId != null) payload['trip_id'] = tripId.toString();
    if (routeId != null) payload['route_id'] = routeId.toString();

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

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

  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';
  }
}