private static void ValidateItemsNames(UpdateShoppingListCommand cmd, IList <Error> errorsList)
{
if (cmd.Items != null && cmd.Items.Any(i => string.IsNullOrWhiteSpace(i.ItemName)))
{
errorsList.Add(new Error(ShoppingListErrors.BlankItemName));
}
}
private static void ValidateItemsNotNull(UpdateShoppingListCommand cmd, IList <Error> errorsList)
{
if (cmd.Items == null)
{
errorsList.Add(new Error(ShoppingListErrors.ItemsNull));
}
}
private static void ValidateTitle(UpdateShoppingListCommand cmd, IList <Error> errorsList)
{
if (string.IsNullOrWhiteSpace(cmd.Title))
{
errorsList.Add(new Error(ShoppingListErrors.BlankTitle));
}
}
private static void ValidateId(UpdateShoppingListCommand cmd, IList <Error> errorsList)
{
if (cmd.GetId() == null || cmd.GetId() == Guid.Empty)
{
errorsList.Add(new Error(ShoppingListErrors.InvalidId));
}
}
private static void ValidateItemsNotRepeated(UpdateShoppingListCommand cmd, IList <Error> errorsList)
{
if (cmd.Items != null)
{
var hasRepeatedItem = cmd.Items.GroupBy(i => i.ItemName, i => i)
.Select(d => (d.Key, d.Count()))
.Any(d => d.Item2 > 1);
if (hasRepeatedItem)
{
errorsList.Add(new Error(ShoppingListErrors.RepeatedItems));
}
}
}
private static void ValidateItemsQuantities(UpdateShoppingListCommand cmd, IList <Error> errorsList)
{
if (cmd.Items != null)
{
foreach (ShoppingListItem i in cmd.Items)
{
if (i.Quantity <= 0)
{
errorsList.Add(new Error(ShoppingListErrors.ItemQuantityZeroOrLess, i.ItemName));
}
}
}
}
public static bool Validate(this UpdateShoppingListCommand cmd, out Error[]?errors)
{
var errorsList = new List <Error>();
ValidateId(cmd, errorsList);
ValidateTitle(cmd, errorsList);
ValidateItemsNotNull(cmd, errorsList);
ValidateItemsNames(cmd, errorsList);
ValidateItemsQuantities(cmd, errorsList);
ValidateItemsNotRepeated(cmd, errorsList);
errors = errorsList.Count > 0 ? errorsList.ToArray() : null;
return(errorsList.Count == 0);
}