trying to make ctrl key to function as 3 different keys based on the elapsed time ctrl has been pressed

I'm using AHK and my main goal is to make my middle mouse button to function as it normally would if I pressed it once, but would trigger "Ctrl + C" or copy if I pressed and held it for 500ms and paste what is copied or "Ctrl + v" if I kept on pressing for 1000ms

I have searched the internet for a week but couldn't find a solution (maybe its because I'm new to this) but here's some codes I found that I believe would get it done but for some reason I couldn't get it to work.

Here's the code I found

The original codeand I have tried to modify some of it and here it is

Modified Code

I apologize for posting as image, as you can see below the indentation doesn't look clean

RCtrl::    keyDown := A_TickCountWhile GetKeyState("RCtrl", "P")        Send {Ctrl Down}    duration := A_TickCount - keyDown    Send {Ctrl Up}    if duration < 300        Send {Enter}    Return