/// <summary>
/// Add a new input state to the current input state stack.
/// This will mark the current state, if any, as inactive and inform it of the new state that is taking its place.
/// Then this will add the new state to the stack, mark it active, and call the BeginState method.
/// </summary>
/// <param name="nextInputState"></param>
public void AddInputState(IInputState nextInputState)
{
if (nextInputState == null)
{
throw new ArgumentNullException(nameof(nextInputState), "Given new state passed to GameBattle AddInputState method is null");
}
// Deactivate any existing state on the stack
if (_inputStateStack.Any())
{
var lastState = _inputStateStack.Peek();
lastState.Deactivate();
}
// Add the new state to the stack and
_inputStateStack.Push(nextInputState);
nextInputState.Activate();
}