import 'package:hive_ce/hive.dart';
import 'package:retail/core/database/hive_database.dart';
import 'package:retail/features/products/data/models/product_model.dart';
import 'package:retail/features/products/data/datasources/product_local_datasource.dart';
import 'package:retail/features/products/domain/entities/product.dart';

/// Hive implementation of ProductLocalDataSource
class ProductLocalDataSourceHive implements ProductLocalDataSource {
  final HiveDatabase _database;

  ProductLocalDataSourceHive(this._database);

  Box<ProductModel> get _box => _database.productsBox;

  /// Convert ProductModel to Product entity
  Product _toEntity(ProductModel model) {
    return Product(
      id: model.id,
      name: model.name,
      description: model.description,
      price: model.price,
      imageUrl: model.imageUrl,
      categoryId: model.categoryId,
      stockQuantity: model.stockQuantity,
      isAvailable: model.isAvailable,
      createdAt: model.createdAt,
      updatedAt: model.updatedAt,
    );
  }

  /// Convert Product entity to ProductModel
  ProductModel _toModel(Product entity) {
    return ProductModel(
      id: entity.id,
      name: entity.name,
      description: entity.description,
      price: entity.price,
      imageUrl: entity.imageUrl,
      categoryId: entity.categoryId,
      stockQuantity: entity.stockQuantity,
      isAvailable: entity.isAvailable,
      createdAt: entity.createdAt,
      updatedAt: entity.updatedAt,
    );
  }

  @override
  Future<List<Product>> getAllProducts() async {
    try {
      return _box.values.map(_toEntity).toList();
    } catch (e) {
      throw Exception('Failed to get products: $e');
    }
  }

  @override
  Future<Product?> getProductById(String id) async {
    try {
      final model = _box.get(id);
      return model != null ? _toEntity(model) : null;
    } catch (e) {
      throw Exception('Failed to get product by ID: $e');
    }
  }

  @override
  Future<List<Product>> getProductsByCategory(String categoryId) async {
    try {
      return _box.values
          .where((product) => product.categoryId == categoryId)
          .map(_toEntity)
          .toList();
    } catch (e) {
      throw Exception('Failed to get products by category: $e');
    }
  }

  @override
  Future<void> saveProducts(List<Product> products) async {
    try {
      final models = products.map(_toModel).toList();
      final Map<String, ProductModel> productsMap = {
        for (var model in models) model.id: model
      };
      await _box.putAll(productsMap);
    } catch (e) {
      throw Exception('Failed to save products: $e');
    }
  }

  @override
  Future<void> deleteAllProducts() async {
    try {
      await _box.clear();
    } catch (e) {
      throw Exception('Failed to delete all products: $e');
    }
  }

  /// Additional Hive-specific methods

  /// Save a single product
  Future<void> saveProduct(Product product) async {
    try {
      final model = _toModel(product);
      await _box.put(model.id, model);
    } catch (e) {
      throw Exception('Failed to save product: $e');
    }
  }

  /// Update an existing product
  Future<void> updateProduct(Product product) async {
    try {
      if (!_box.containsKey(product.id)) {
        throw Exception('Product not found: ${product.id}');
      }
      final model = _toModel(product);
      await _box.put(model.id, model);
    } catch (e) {
      throw Exception('Failed to update product: $e');
    }
  }

  /// Delete a specific product
  Future<void> deleteProduct(String id) async {
    try {
      await _box.delete(id);
    } catch (e) {
      throw Exception('Failed to delete product: $e');
    }
  }

  /// Check if product exists
  Future<bool> productExists(String id) async {
    try {
      return _box.containsKey(id);
    } catch (e) {
      throw Exception('Failed to check product existence: $e');
    }
  }

  /// Get available products only
  Future<List<Product>> getAvailableProducts() async {
    try {
      return _box.values
          .where((product) => product.isAvailable && product.stockQuantity > 0)
          .map(_toEntity)
          .toList();
    } catch (e) {
      throw Exception('Failed to get available products: $e');
    }
  }

  /// Get products with low stock
  Future<List<Product>> getLowStockProducts(int threshold) async {
    try {
      return _box.values
          .where((product) =>
              product.stockQuantity <= threshold && product.stockQuantity > 0)
          .map(_toEntity)
          .toList();
    } catch (e) {
      throw Exception('Failed to get low stock products: $e');
    }
  }

  /// Search products by name or description
  Future<List<Product>> searchProducts(String query) async {
    try {
      final lowercaseQuery = query.toLowerCase();
      return _box.values
          .where((product) =>
              product.name.toLowerCase().contains(lowercaseQuery) ||
              product.description.toLowerCase().contains(lowercaseQuery))
          .map(_toEntity)
          .toList();
    } catch (e) {
      throw Exception('Failed to search products: $e');
    }
  }
}