Suggestions for objective-c to login via code into mac osx [on hold]

Please help me in assessing this feasibility

I need to enhance a daemon (running as root) on macOSx in such a way that if my client sends username and password over socket to daemon then it makes that user to log in, who is currently logged out (not just locked) without making user to go via system login window

I understand that for locked window it is possible (NameAndPassword/ knock to unlock etc. ) but not sure about for the user who is logged out.

Can you please let me know some pointers if it is at all possible?