public async Task SaveReportAsync()
{
IReadOnlyCollection <Cart> carts = await _cartService.GetAllAsync();
IReadOnlyCollection <CartItem> cartItems = await _cartItemService.GetAllAsync();
IReadOnlyCollection <Product> products = await _productService.GetAllAsync();
var sb = new StringBuilder();
WriteTotalCarts(carts, sb);
WriteCartsWithBonus(sb, carts, cartItems, products);
WriteCartsToExpire(sb, carts);
WriteCartsCostAverage(sb, carts, cartItems, products);
var reportText = sb.ToString();
await SaveReportToFileAsync(reportText);
}
