local yard_id = "ARC"

__approach_callback_mode = 1
if event.approach and not event.has_entered then --disable ARS for all approaching trains
	atc_set_ars_disable(true)
	atc_set_lzb_tsr(1)
	return
end

if event.train then

    if F.has_rc("ARC_YARD_REENTRY") then
        -- loco will use S23-S approach track as headshunt and re-enter yard
        -- RC will be removed by the headshunt controller (req to trigger it)
        -- manually set the route here before ARS has a chance
        set_route(POS(-2033,21,731),"Yard Reentry (LENGTH LIMIT)")
        F.indicator(S.yards[yard_id].active_indicator_pos,false)

		-- Extract the second exit director from ARC_2nd_EXIT_x and insert if available
        -- should be safe to add it now as the route has already been set to reenter the yard first
		local rc = F.get_rc_safe():match("ARC_2ND_EXIT_(%S+)")
		print("Second Exit RC: "..tostring(rc))
		if rc then
			F.remove_rc_match("ARC_2ND_EXIT_%S+")
			F.add_rc(rc)
			print(F.get_rc_safe())
		end

        -- defer re-enabling ARS to ensure the route has been accepted, or at least queued
        atc_send("S4D1A1")
		return
    end

	-- disregard light exit locos
    if F.has_rc(yard_id.."_LIGHT_EXIT") then
        F.remove_rc(yard_id.."_LIGHT_EXIT")
        atc_set_ars_disable(false)
        atc_send("SM")
        return
    end
end
F.headshunt_exit(yard_id,true)