import 'package:riverpod_annotation/riverpod_annotation.dart';
import 'cart_provider.dart';

part 'cart_item_count_provider.g.dart';

/// Provider that calculates total number of items in cart
/// This is optimized to only rebuild when the count changes
@riverpod
int cartItemCount(Ref ref) {
  final itemsAsync = ref.watch(cartProvider);
  return itemsAsync.when(
    data: (items) => items.fold<int>(0, (sum, item) => sum + item.quantity),
    loading: () => 0,
    error: (_, __) => 0,
  );
}

/// Provider that calculates unique items count in cart
@riverpod
int cartUniqueItemCount(Ref ref) {
  final itemsAsync = ref.watch(cartProvider);
  return itemsAsync.when(
    data: (items) => items.length,
    loading: () => 0,
    error: (_, __) => 0,
  );
}