import 'package:flutter/foundation.dart';

import '../models/product.dart';
import '../services/product_service.dart';

class InventoryViewModel extends ChangeNotifier {
  final ProductService productService;

  InventoryViewModel({
    required this.productService,
  });

  List<Product> _products = [];

  List<Product> get products => _products;

  Future<void> load() async {
    _products = await productService.getProducts();
    notifyListeners();
  }

  Future<void> decreaseStock(
      String productId,
      int amount,
      ) async {
    await productService.decreaseStock(productId, amount);

    final index = _products.indexWhere(
          (product) => product.id == productId,
    );

    if (index != -1) {
      _products[index] = _products[index].copyWith(
        stockQuantity:
        _products[index].stockQuantity - amount,
      );
    }

    notifyListeners();
  }

  Future<void> increaseStock(
      String productId,
      int amount,
      ) async {
    await productService.increaseStock(productId, amount);

    final index = _products.indexWhere(
          (product) => product.id == productId,
    );

    if (index != -1) {
      _products[index] = _products[index].copyWith(
        stockQuantity:
        _products[index].stockQuantity + amount,
      );
    }

    notifyListeners();
  }
}