SUBSYSTEM_DEF(lighting)
	name = "Lighting"
	wait = 2
	init_order = INIT_ORDER_LIGHTING
	flags = SS_TICKER
	var/static/list/sources_queue = list() // List of lighting sources queued for update.
	var/static/list/corners_queue = list() // List of lighting corners queued for update.
	var/static/list/objects_queue = list() // List of lighting objects queued for update.

	loading_points = 6 SECONDS // Yogs -- loading times

/datum/controller/subsystem/lighting/stat_entry(msg)
	msg = "L:[length(sources_queue)]|C:[length(corners_queue)]|O:[length(objects_queue)]"
	return ..()

/datum/controller/subsystem/lighting/get_metrics()
	. = ..()
	.["queue_sources"] = length(sources_queue)
	.["queue_corners"] = length(corners_queue)
	.["queue_objects"] = length(objects_queue)

/datum/controller/subsystem/lighting/Initialize(timeofday)
	if(!initialized)
		if (CONFIG_GET(flag/starlight))
			for(var/I in GLOB.areas)
				var/area/A = I
				if (A.dynamic_lighting == DYNAMIC_LIGHTING_IFSTARLIGHT)
					A.luminosity = 0

		create_all_lighting_objects()
		initialized = TRUE

	fire(FALSE, TRUE)

	return SS_INIT_SUCCESS

/datum/controller/subsystem/lighting/fire(resumed, init_tick_checks)
	MC_SPLIT_TICK_INIT(3)
	if(!init_tick_checks)
		MC_SPLIT_TICK
	var/list/queue = sources_queue
	var/i = 0
	for (i in 1 to length(queue))
		var/datum/light_source/L = queue[i]

		L.update_corners()

		L.needs_update = LIGHTING_NO_UPDATE

		if(init_tick_checks)
			CHECK_TICK
		else if (MC_TICK_CHECK)
			break
	if (i)
		queue.Cut(1, i+1)
		i = 0

	if(!init_tick_checks)
		MC_SPLIT_TICK

	queue = corners_queue
	for (i in 1 to length(queue))
		var/datum/lighting_corner/C = queue[i]

		C.needs_update = FALSE //update_objects() can call qdel if the corner is storing no data
		C.update_objects()

		if(init_tick_checks)
			CHECK_TICK
		else if (MC_TICK_CHECK)
			break
	if (i)
		queue.Cut(1, i+1)
		i = 0


	if(!init_tick_checks)
		MC_SPLIT_TICK

	queue = objects_queue
	for (i in 1 to length(queue))
		var/datum/lighting_object/O = queue[i]

		if (QDELETED(O))
			continue

		O.update()
		O.needs_update = FALSE
		if(init_tick_checks)
			CHECK_TICK
		else if (MC_TICK_CHECK)
			break
	if (i)
		queue.Cut(1, i+1)


/datum/controller/subsystem/lighting/Recover()
	initialized = SSlighting.initialized
	..()