public MenuStateMachineState ValidateStateTransition(int userInput, MenuStateMachineState currentState, IBeverage beverage = null)
{
switch (currentState)
{
case MenuStateMachineState.Initialized:
if (userInput == 1)
{
return(MenuStateMachineState.OrderingBeverage);
}
else
{
return(MenuStateMachineState.Exit);
}
case MenuStateMachineState.OrderingBeverage:
if (userInput >= 1 && userInput <= 10)
{
if (beverage.HasStandardSize() && !beverage.HasCoffee())
{
return(MenuStateMachineState.Finished);
}
if (beverage.HasStandardSize() && beverage.HasCoffee())
{
return(MenuStateMachineState.SelectCoffeeType);
}
if (!beverage.HasStandardSize())
{
return(MenuStateMachineState.SelectBeverageSize);
}
}
return(MenuStateMachineState.OrderingBeverage);
case MenuStateMachineState.SelectBeverageSize:
if (userInput >= 1 && userInput <= 4)
{
if (beverage.HasCoffee())
{
return(MenuStateMachineState.SelectCoffeeType);
}
else
{
return(MenuStateMachineState.Finished);
}
}
return(MenuStateMachineState.SelectBeverageSize);
case MenuStateMachineState.SelectCoffeeType:
if (userInput >= 1 && userInput <= 2)
{
return(MenuStateMachineState.Finished);
}
return(MenuStateMachineState.SelectBeverageSize);
case MenuStateMachineState.Finished:
return(MenuStateMachineState.Exit);
default:
return(MenuStateMachineState.Exit);
}
}