public void Register(EndUserId endUserId, string?name, RobotApplication?application)
{
void AddRegistration()
{
var registrationId = new RobotRegistrationId(Guid.NewGuid());
var e = RobotRegistered.Create(registrationId, endUserId, name, application);
Apply(e);
Append(registrationId.Value, RobotRegistered.EventType, e);
}
var latestRegistration = Registrations.LastOrDefault();
if (latestRegistration == null)
{
AddRegistration();
}
else
{
latestRegistration.Apply(
registration => throw new ValidationException("Robot is already registered"),
unregistration => AddRegistration()
);
}
}
public Registration(Robot robot, RobotRegistered e)
{
Id = new RobotRegistrationId(Guid.NewGuid());
EndUserId = e.EndUserId;
Name = e.Name ?? $"{robot.Product:G} - {robot.SerialNumber}";
Application = e.Application;
}
private void Apply(RobotRegistered e)
{
void AddRegistration()
{
var registration = new RobotRegistration.Registration(this, e);
Registrations = Registrations.Add(registration);
}
var latestRegistration = Registrations.LastOrDefault();
if (latestRegistration == null)
{
AddRegistration();
}
else
{
latestRegistration.Apply(
registration => throw new InvalidOperationException("Robot is already registered"),
unregistration => AddRegistration()
);
}
}
