import 'package:flutter/foundation.dart';
import 'package:sentry_flutter/sentry_flutter.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 {
    try {
      _products = await productService.getProducts();
      notifyListeners();
    } catch (e, stack) {
      debugPrint('InventoryViewModel: load error: $e');
      Sentry.captureException(e, stackTrace: stack);
      rethrow;
    }
  }

  Future<void> decreaseStock(String productId, int amount) async {
    try {
      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();
    } catch (e, stack) {
      if (e is InsufficientStockException) rethrow;

      debugPrint('InventoryViewModel: decreaseStock error: $e');
      Sentry.captureException(e, stackTrace: stack);
      rethrow;
    }
  }

  Future<void> increaseStock(String productId, int amount) async {
    try {
      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();
    } catch (e, stack) {
      debugPrint('InventoryViewModel: increaseStock error: $e');
      Sentry.captureException(e, stackTrace: stack);
      rethrow;
    }
  }

  void applyStockDelta(String productId, int delta) {
    if (delta == 0) return;

    final index = _products.indexWhere((product) => product.id == productId);
    if (index == -1) return;

    _products[index] = _products[index].copyWith(
      stockQuantity: _products[index].stockQuantity + delta,
    );
    notifyListeners();
  }
}