import '../../core/api/api_client.dart';
import '../../shared/models/product.dart';

/// Lightweight dish result returned by GET /dishes/search.
class DishSearchResult {
  final String id;
  final String name;
  final String? imageUrl;
  final double avgRating;

  const DishSearchResult({
    required this.id,
    required this.name,
    this.imageUrl,
    required this.avgRating,
  });

  factory DishSearchResult.fromJson(Map<String, dynamic> json) {
    return DishSearchResult(
      id: json['id'] as String,
      name: json['name'] as String,
      imageUrl: json['image_url'] as String?,
      avgRating: (json['avg_rating'] as num?)?.toDouble() ?? 0,
    );
  }
}

/// One item from GET /diary/recent.
class RecentDiaryItem {
  final String itemType; // "dish" | "product"
  final String? dishId;
  final String? productId;
  final String name;
  final String? imageUrl;
  final String? categoryName;
  final double? caloriesPer100g;
  final double? caloriesPerServing;

  const RecentDiaryItem({
    required this.itemType,
    this.dishId,
    this.productId,
    required this.name,
    this.imageUrl,
    this.categoryName,
    this.caloriesPer100g,
    this.caloriesPerServing,
  });

  factory RecentDiaryItem.fromJson(Map<String, dynamic> json) {
    return RecentDiaryItem(
      itemType: json['item_type'] as String? ?? 'dish',
      dishId: json['dish_id'] as String?,
      productId: json['product_id'] as String?,
      name: json['name'] as String? ?? '',
      imageUrl: json['image_url'] as String?,
      categoryName: json['category_name'] as String?,
      caloriesPer100g: (json['calories_per_100g'] as num?)?.toDouble(),
      caloriesPerServing: (json['calories_per_serving'] as num?)?.toDouble(),
    );
  }

  /// For products: calories per 100 g; for dishes: calories per serving.
  double? get displayCalories =>
      itemType == 'product' ? caloriesPer100g : caloriesPerServing;
}

/// Service for searching products/dishes and loading recently used diary items.
class FoodSearchService {
  const FoodSearchService(this._client);

  final ApiClient _client;

  /// Searches catalog products by name.
  Future<List<CatalogProduct>> searchProducts(String query) async {
    if (query.isEmpty) return [];
    final list = await _client.getList(
      '/products/search',
      params: {'q': query, 'limit': '20'},
    );
    return list
        .map((item) => CatalogProduct.fromJson(item as Map<String, dynamic>))
        .toList();
  }

  /// Searches dishes by name.
  Future<List<DishSearchResult>> searchDishes(String query) async {
    if (query.isEmpty) return [];
    final list = await _client.getList(
      '/dishes/search',
      params: {'q': query, 'limit': '10'},
    );
    return list
        .map((item) => DishSearchResult.fromJson(item as Map<String, dynamic>))
        .toList();
  }

  /// Returns recent diary items (dishes and products) for the current user.
  Future<List<RecentDiaryItem>> getRecent({int limit = 10}) async {
    final list = await _client.getList(
      '/diary/recent',
      params: {'limit': '$limit'},
    );
    return list
        .map((item) => RecentDiaryItem.fromJson(item as Map<String, dynamic>))
        .toList();
  }
}