public decimal CalculateShippingCost(string zip, decimal weight)
{
var zone = _zipCodeRepo.GetZoneByZip(zip);
var shippingCost = _shippingCostRepo.GetShippingCosts().Where(x => x.Zone == zone && x.Weight == weight).FirstOrDefault();
if (shippingCost == null)
{
throw new Exception($"Invalid weight of {weight} to this zip {zip}");
}
return(shippingCost.Cost);
}
