/// <summary>
/// Creates the correct IDrink from EDrinks.
/// Logs with <see cref="IOutputter"/> if an incomaptible topping is detected
/// Throws an exception if <paramref name="type"/> value is not supported
/// </summary>
/// <param name="type">
/// Drink type
/// </param>
/// <param name="hasSugar">
/// Should drink have sugar?
/// </param>
/// <param name="hasMilk">
/// Should drink have milk? Defaults to false
/// </param>
/// <param name="hasChocolate">
/// Should drink have chocolate? Defaults to false
/// </param>
/// <returns></returns>
public IDrink BuildDrink(EDrinks type, bool hasSugar, bool hasMilk = false, bool hasChocolate = false)
{
IDrink newDrink = null;
switch (type)
{
case EDrinks.Expresso:
newDrink = new Expresso(hasSugar);
break;
case EDrinks.HotTea:
newDrink = new HotTea(hasSugar);
break;
case EDrinks.IceTea:
newDrink = new IceTea(hasSugar);
break;
default:
throw new ArgumentException($"Unknown drink type: {type}");
}
//I tried to make it as simple as possible to add new interfaces, following the expected pattern
if (hasChocolate)
{
IChocolateDrink chocoDrink = newDrink as IChocolateDrink;
if (chocoDrink == null)
{
Logger.WriteToConsole($"Drink type: {newDrink.Description} does not accept chocholate");
}
chocoDrink.HasChocolate = hasChocolate;
}
if (hasMilk)
{
IMilkDrink milkDrink = newDrink as IMilkDrink;
if (milkDrink == null)
{
Logger.WriteToConsole($"Drink type: {newDrink.Description} does not accept milk");
}
milkDrink.HasMilk = hasMilk;
}
return(newDrink);
}
/// <summary>
/// Check <paramref name="drink"/> for possible interfaces and take their values for the toppings
/// Uses <see cref="IOutputter"/> to write to console
/// </summary>
/// <param name="drink">
/// Drink being read for prepare
/// </param>
public void Prepare(IDrink drink)
{
string message = $"We are preparing the following drink for you: {drink.Description}";
var milk = drink as IMilkDrink;
if (milk == null || !milk.HasMilk)
{
message += " without milk";
}
else
{
message += " with milk";
}
if (drink.HasSugar)
{
message += " with sugar";
}
else
{
message += " without sugar";
}
var chocolate = drink as IChocolateDrink;
if (chocolate == null || !chocolate.HasChocolate)
{
message += " without chocolate";
}
else
{
message += " with chocolate";
}
Outputter.WriteToConsole(message);
}