Hide UI automatically hide after not moving my mouse for 3 or so seconds?

[Krainz]

local addon = CreateFrame("Frame");
addon:RegisterEvent("PLAYER_LOGIN");
addon:RegisterEvent("PLAYER_REGEN_DISABLED");
addon:RegisterEvent("PLAYER_REGEN_ENABLED");
addon:RegisterEvent("PLAYER_STARTED_MOVING");
addon:RegisterEvent("PLAYER_STOPPED_MOVING");
 
local function wait(seconds)
  local start = os.time()
  repeat until os.time() > start + seconds
end
 
addon:SetScript("OnEvent", function(self, event, ...)
 
    if event == "PLAYER_LOGIN"
    or event == "PLAYER_REGEN_DISABLED"
    or event == "PLAYER_STOPPED_MOVING" then
        
        if not UnitAffectingCombat("player") then
            wait(3)
            if not UnitAffectingCombat("player") then
                C_Timer.After(1, UIFrameFadeOut(UIParent, 3, UIParent:GetAlpha(), 0));
            end;
        end;
    else
        UIParent:SetAlpha(1);
    end;
    
    if UnitAffectingCombat("player") then
        UIParent:SetAlpha(1);
    end;
end);
 
addon:SetScript("OnUpdate", function(self, elapsed)
 
    local speed = GetUnitSpeed("player");
    if speed ~=0 then
        UIParent:SetAlpha(1);
    else
        if GetMouseFocus() then
            if GetMouseFocus():GetName() ~= "WorldFrame" then
                UIParent:SetAlpha(1);
            else
                if not UnitAffectingCombat("player") then
                    wait(3)
                    if not UnitAffectingCombat("player") then
                        C_Timer.After(1, UIFrameFadeOut(UIParent, 3, UIParent:GetAlpha(), 0))
                    end;
                end;
            end;
        end;
    end;
    
    if UnitName("mouseover") then
        UIParent:SetAlpha(1);
    end;
end);

And in the end I basically tried inserting a wait() function that just basically didn't work out in the end. That code doesn't work and does nothing when I log in.