public async Task <OperationResult> ValidateAsync(IShopManager manager, Product product)
{
if (manager == null)
{
throw new ArgumentNullException(nameof(manager));
}
if (product == null)
{
throw new ArgumentNullException(nameof(product));
}
var errors = new List <OperationError>();
if (product.Name.IsNullOrEmpty())
{
errors.Add(manager.ErrorDescriber.EmptyProductName());
}
if (product.Code <= 0)
{
errors.Add(manager.ErrorDescriber.EmptyProductCode());
}
var prod = await manager.GetProductByCodeAsync(product.Code, false, false, false);
if (prod != null && prod.Id != product.Id)
{
errors.Add(manager.ErrorDescriber.DuplicateProductCode());
}
prod = await manager.GetProductByNameAsync(product.Name, false, false, false);
if (prod != null && prod.Id != product.Id)
{
errors.Add(manager.ErrorDescriber.DuplicateProductName());
}
if (errors.Count > 0)
{
return(OperationResult.Failure(errors.ToArray()));
}
return(OperationResult.Success());
}