/// <summary>
/// Checks if the period is valid
/// </summary>
/// <param name="period"></param>
/// <returns></returns>
protected bool IsPeriodValid(PeriodOfDay period)
{
return Restaurant.Menu.Dishes.Any(n => n.PeriodOfDay == period);
}
/// <summary>
/// Validate the input for periodofday
/// </summary>
/// <param name="periodOfDay"></param>
/// <returns></returns>
private string ValidatePeriodOfDay(PeriodOfDay? periodOfDay)
{
if (periodOfDay.HasValue && IsPeriodValid(periodOfDay.Value)) return null;
var validPeriods = GetValidPeriodOfDays();
var validPeriodsString = GetStringOfPeriodsOfDay(validPeriods);
return $"Invalid period. Valid periods are: {validPeriodsString}";
}
/// <summary>
/// Creates a menu item
/// </summary>
/// <param name="name">Dish name to be used</param>
/// <param name="period">Period where the dish will be avaiable</param>
/// <param name="dishType">Type of the dish</param>
/// <param name="maxCount">Max number of items on a order</param>
/// <returns></returns>
private static MenuItem CreateMenuItem(string name, PeriodOfDay period, DishType dishType = DishType.Entree, int maxCount = 1)
{
return new MenuItem {Dish = new Dish {Name = name }, PeriodOfDay = period , DishType = dishType, MaxOrder = maxCount};
}
/// <summary>
/// Validate the max order number of an item
/// </summary>
/// <param name="item"></param>
/// <param name="periodOfDay"></param>
/// <param name="quantity"></param>
/// <returns></returns>
private string ValidateItemMaxOrder(string item, PeriodOfDay periodOfDay, int quantity)
{
var errorMessage = string.Empty;
var menuItem = GetMenuItemFromDishTypeString(item, periodOfDay);
if (menuItem.MaxOrder < quantity)
{
errorMessage = $"You cannot order more than {menuItem.MaxOrder} {menuItem.Dish.Name}";
}
return errorMessage;
}
/// <summary>
/// Validates if an item is available in that period
/// </summary>
/// <param name="dishType"></param>
/// <param name="period"></param>
/// <returns></returns>
private string ValidateItemAvailability(DishType dishType, PeriodOfDay period)
{
var errorMessage = string.Empty;
var isAnInvalidItem = _avaiableDishes.Count(n => n.DishType == dishType && n.PeriodOfDay == period) == 0;
if (isAnInvalidItem)
{
errorMessage = $"{dishType} is not available in this period";
}
return errorMessage;
}
/// <summary>
/// Validate an item
/// </summary>
/// <param name="item"></param>
/// <param name="periodOfDay"></param>
/// <param name="quantity"></param>
/// <returns></returns>
private string ValidateItem(string item, PeriodOfDay periodOfDay, int quantity)
{
var errorMessage = ValidateDishType(item);
if (!string.IsNullOrEmpty(errorMessage)) return errorMessage;
var dishType = GetDishTypeFromString(item);
errorMessage = ValidateItemAvailability(dishType.Value, periodOfDay);
if (!string.IsNullOrEmpty(errorMessage)) return errorMessage;
errorMessage = ValidateItemMaxOrder(item, periodOfDay, quantity);
return errorMessage;
}
/// <summary>
/// Gets a menu item from the string inputs
/// </summary>
/// <param name="item"></param>
/// <param name="periodOfDay"></param>
/// <returns></returns>
private MenuItem GetMenuItemFromDishTypeString(string item, PeriodOfDay periodOfDay)
{
return Restaurant.Menu.Dishes.Single(
n => Convert.ToInt32(n.DishType) == Convert.ToInt32(item) && n.PeriodOfDay == periodOfDay);
}
/// <summary>
/// Gets an error message for invalid items
/// </summary>
/// <param name="invalidItems"></param>
/// <param name="validItems"></param>
/// <param name="periodOfDay"></param>
/// <returns></returns>
private string GetInvalidItemsMessage(Dictionary<string, string> invalidItems, List<string> validItems,
PeriodOfDay periodOfDay)
{
var orderstring = "I'm sorry";
if (validItems.Count > 0)
{
orderstring += ", I could understand that you want: ";
for (var index = 0; index < validItems.Count; index++)
{
var validItem = validItems[index];
var menuItem = GetMenuItemFromDishTypeString(validItem, periodOfDay);
if (index > 0)
{
orderstring += ", ";
}
orderstring += $"{menuItem.Dish.Name} as {menuItem.DishType}";
}
}
orderstring += ". But I had these problems: ";
for (var index = 0; index < invalidItems.Keys.Count; index++)
{
var invalidItemKey = invalidItems.Keys.ElementAt(index);
if (index > 0)
{
orderstring += ", ";
}
orderstring += invalidItems[invalidItemKey];
}
return orderstring;
}
