// food_service.dart — طبقة الاتصال بـ backend/food (جهة الراكب)
import 'dart:convert';
import '../functions/crud.dart';
import '../../constant/links.dart';
import 'food_models.dart';

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

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

  static Future<FoodApiResult<List<FoodMerchant>>> browseMerchants({
    required String city,
    String? category,
  }) async {
    final payload = <String, dynamic>{'city': city};
    if (category != null && category.isNotEmpty) payload['category'] = category;

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

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

  static Future<FoodApiResult<List<FoodMerchant>>> searchMerchants({
    required String city,
    required String query,
  }) async {
    final res = await CRUD().post(
      link: '$_base/merchant/search.php',
      payload: {'city': city, 'q': query},
    );

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

  static Future<FoodApiResult<Map<String, dynamic>>> merchantDetails(int merchantId) async {
    final res = await CRUD().post(
      link: '$_base/merchant/details.php',
      payload: {'merchant_id': merchantId.toString()},
    );

    if (res is Map && res['status'] == 'success') {
      final msg = res['message'];
      if (msg is Map) {
        final merchant = FoodMerchant.fromJson(Map<String, dynamic>.from(msg['merchant']));
        final categories = (msg['categories'] is List)
            ? (msg['categories'] as List)
                .map((c) => FoodMenuCategory.fromJson(Map<String, dynamic>.from(c)))
                .toList()
            : <FoodMenuCategory>[];
        return FoodApiResult(true, {'merchant': merchant, 'categories': categories}, 'ok');
      }
    }
    return FoodApiResult(false, null, _errMsg(res));
  }

  static Future<FoodApiResult<FoodQuote>> getQuote({
    required int merchantId,
    required List<FoodCartLine> lines,
  }) async {
    final res = await CRUD().post(
      link: '$_base/cart/quote.php',
      payload: {
        'merchant_id': merchantId.toString(),
        'items': jsonEncode(lines.map((l) => l.toQuotePayload()).toList()),
      },
    );

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

  static Future<FoodApiResult<int>> createOrder({
    required String quoteToken,
    required String clientOrderUuid,
    required String deliveryAddress,
    required double deliveryLat,
    required double deliveryLng,
    required String paymentMethod, // wallet | cash
    String? customerNote,
  }) async {
    final res = await CRUD().post(
      link: '$_base/order/create.php',
      payload: {
        'quote_token': quoteToken,
        'client_order_uuid': clientOrderUuid,
        'delivery_address': deliveryAddress,
        'delivery_lat': deliveryLat.toString(),
        'delivery_lng': deliveryLng.toString(),
        'payment_method': paymentMethod,
        if (customerNote != null && customerNote.isNotEmpty) 'customer_note': customerNote,
      },
    );

    if (res is Map && res['status'] == 'success') {
      final msg = res['message'];
      if (msg is Map && msg['order_id'] != null) {
        return FoodApiResult(true, int.tryParse(msg['order_id'].toString()) ?? 0, 'ok');
      }
    }
    return FoodApiResult(false, null, _errMsg(res), code: _errCode(res));
  }

  static Future<FoodApiResult<FoodOrder>> getOrderStatus(int orderId) async {
    final res = await CRUD().post(
      link: '$_base/order/status.php',
      payload: {'order_id': orderId.toString()},
    );

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

  static Future<FoodApiResult<void>> cancelOrder(int orderId, {String? reason}) async {
    final res = await CRUD().post(
      link: '$_base/order/cancel.php',
      payload: {'order_id': orderId.toString(), if (reason != null) 'reason': reason},
    );

    if (res is Map && res['status'] == 'success') return FoodApiResult(true, null, 'ok');
    return FoodApiResult(false, null, _errMsg(res));
  }

  static Future<FoodApiResult<void>> rateOrder(int orderId, int rating, {String? comment}) async {
    final res = await CRUD().post(
      link: '$_base/order/rate.php',
      payload: {
        'order_id': orderId.toString(),
        'rating': rating.toString(),
        if (comment != null && comment.isNotEmpty) 'comment': comment,
      },
    );

    if (res is Map && res['status'] == 'success') return FoodApiResult(true, null, 'ok');
    return FoodApiResult(false, null, _errMsg(res));
  }

  static Future<FoodApiResult<List<FoodOrder>>> getHistory({int page = 1}) async {
    final res = await CRUD().post(
      link: '$_base/order/history.php',
      payload: {'page': page.toString()},
    );

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

  static int? _errCode(dynamic res) {
    if (res is Map && res['code'] != null) return int.tryParse(res['code'].toString());
    return null;
  }

  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';
  }
}