SUBSYSTEM_DEF(nightshift)
	name = "Night Shift"
	init_order = INIT_ORDER_NIGHTSHIFT
	priority = FIRE_PRIORITY_NIGHTSHIFT
	wait = 60 SECONDS
	flags = SS_NO_TICK_CHECK

	var/nightshift_active = FALSE
	var/nightshift_first_check = 30 SECONDS

	var/high_security_mode = FALSE

/datum/controller/subsystem/nightshift/Initialize()
	if(!CONFIG_GET(flag/enable_night_shifts))
		can_fire = FALSE
	/*
	if(config.randomize_shift_time)
		GLOB.gametime_offset = rand(0, 23) HOURS
	*/
	return SS_INIT_SUCCESS

/datum/controller/subsystem/nightshift/fire(resumed = FALSE)
	if(round_duration_in_ds < nightshift_first_check)
		return
	check_nightshift()

/datum/controller/subsystem/nightshift/proc/announce(message)
	var/announce_z
	if(using_map.station_levels.len)
		announce_z = pick(using_map.station_levels)
	/* CHOMPEdit - TTSless
	//VOREStation Edit - TTS
	var/pickedsound
	if(!high_security_mode)
		if(nightshift_active)
			pickedsound = 'sound/AI/dim_lights.ogg'
		else
			pickedsound = 'sound/AI/bright_lights.ogg'
	*/
	priority_announcement.Announce(message, new_title = "Automated Lighting System Announcement", /* new_sound = pickedsound,*/ zlevel = announce_z)
	// CHOMPEdit End
	//VOREStation Edit End

/datum/controller/subsystem/nightshift/proc/check_nightshift(check_canfire=FALSE) //This is called from elsewhere, like setting the alert levels
	if(check_canfire && !can_fire)
		return
	var/emergency = security_level > SEC_LEVEL_GREEN
	var/announcing = TRUE
	var/night_time = using_map.get_nightshift()
	if(high_security_mode != emergency)
		high_security_mode = emergency
		if(night_time)
			announcing = FALSE
			if(!emergency)
				announce("Restoring night lighting configuration to normal operation.")
			else
				announce("Disabling night lighting: Station is in a state of emergency.")
	if(emergency)
		night_time = FALSE
	if(nightshift_active != night_time)
		update_nightshift(night_time, announcing)

/datum/controller/subsystem/nightshift/proc/update_nightshift(active, announce = TRUE)
	nightshift_active = active
	if(announce)
		if(active)
			announce("Good evening, crew. To reduce power consumption and stimulate the circadian rhythms of some species, all of the lights aboard the station have been dimmed for the night.")
		else
			announce("Good morning, crew. As it is now day time, all of the lights aboard the station have been restored to their former brightness.")
	for(var/obj/machinery/power/apc/apc in GLOB.apcs)
		if(apc.z in using_map.station_levels)
			apc.set_nightshift(active, TRUE)
			CHECK_TICK