/* HUD DATUMS */

GLOBAL_LIST_EMPTY(all_huds)

//GLOBAL HUD LIST
GLOBAL_LIST_INIT(huds, list(
	DATA_HUD_SECURITY_BASIC = new/datum/atom_hud/data/human/security/basic(),
	DATA_HUD_SECURITY_ADVANCED = new/datum/atom_hud/data/human/security/advanced(),
	DATA_HUD_MEDICAL_BASIC = new/datum/atom_hud/data/human/medical/basic(),
	DATA_HUD_MEDICAL_ADVANCED = new/datum/atom_hud/data/human/medical/advanced(),
	DATA_HUD_DIAGNOSTIC_BASIC = new/datum/atom_hud/data/diagnostic/basic(),
	DATA_HUD_DIAGNOSTIC_ADVANCED = new/datum/atom_hud/data/diagnostic/advanced(),
	DATA_HUD_ABDUCTOR = new/datum/atom_hud/abductor(),
	DATA_HUD_SENTIENT_DISEASE = new/datum/atom_hud/sentient_disease(),
	DATA_HUD_AI_DETECT = new/datum/atom_hud/ai_detector(),
	ANTAG_HUD_CULT = new/datum/atom_hud/antag(),
	ANTAG_HUD_REV = new/datum/atom_hud/antag(),
	ANTAG_HUD_OPS = new/datum/atom_hud/antag(),
	ANTAG_HUD_WIZ = new/datum/atom_hud/antag(),
	ANTAG_HUD_SHADOW = new/datum/atom_hud/antag(),
	ANTAG_HUD_TRAITOR = new/datum/atom_hud/antag/hidden(),
	ANTAG_HUD_NINJA = new/datum/atom_hud/antag/hidden(),
	ANTAG_HUD_CHANGELING = new/datum/atom_hud/antag/hidden(),
	ANTAG_HUD_ABDUCTOR = new/datum/atom_hud/antag/hidden(),
	ANTAG_HUD_DEVIL = new/datum/atom_hud/antag(),
	ANTAG_HUD_SINTOUCHED = new/datum/atom_hud/antag/hidden(),
	ANTAG_HUD_SOULLESS = new/datum/atom_hud/antag/hidden(),
	ANTAG_HUD_CLOCKWORK = new/datum/atom_hud/antag(),
	ANTAG_HUD_BROTHER = new/datum/atom_hud/antag/hidden(),
	ANTAG_HUD_HIVE = new/datum/atom_hud/antag/hidden(),
	ANTAG_HUD_OBSESSED = new/datum/atom_hud/antag/hidden(),
	ANTAG_HUD_HIVEAWAKE = new/datum/atom_hud/antag()	))

/datum/atom_hud
	var/list/atom/hudatoms = list() //list of all atoms which display this hud
	var/list/mob/hudusers = list() //list with all mobs who can see the hud
	var/list/hud_icons = list() //these will be the indexes for the atom's hud_list

	var/list/next_time_allowed = list() //mobs associated with the next time this hud can be added to them
	var/list/queued_to_see = list() //mobs that have triggered the cooldown and are queued to see the hud, but do not yet

/datum/atom_hud/New()
	GLOB.all_huds += src

/datum/atom_hud/Destroy()
	for(var/v in hudusers)
		remove_hud_from(v)
	for(var/v in hudatoms)
		remove_from_hud(v)
	GLOB.all_huds -= src
	return ..()

/datum/atom_hud/proc/remove_hud_from(mob/M)
	if(!M || !hudusers[M])
		return
	if (!--hudusers[M])
		hudusers -= M
		if(queued_to_see[M])
			queued_to_see -= M
		else
			for(var/atom/A in hudatoms)
				remove_from_single_hud(M, A)

/datum/atom_hud/proc/remove_from_hud(atom/A)
	if(!A)
		return FALSE
	for(var/mob/M in hudusers)
		remove_from_single_hud(M, A)
	hudatoms -= A
	return TRUE

/datum/atom_hud/proc/remove_from_single_hud(mob/M, atom/A) //unsafe, no sanity apart from client
	if(!M || !M.client || !A)
		return
	for(var/i in hud_icons)
		M.client.images -= A.hud_list[i]

/datum/atom_hud/proc/add_hud_to(mob/M)
	if(!M)
		return
	if(!hudusers[M])
		hudusers[M] = 1
		if(next_time_allowed[M] > world.time)
			if(!queued_to_see[M])
				addtimer(CALLBACK(src, .proc/show_hud_images_after_cooldown, M), next_time_allowed[M] - world.time)
				queued_to_see[M] = TRUE
		else
			next_time_allowed[M] = world.time + ADD_HUD_TO_COOLDOWN
			for(var/atom/A in hudatoms)
				add_to_single_hud(M, A)
	else
		hudusers[M]++

/datum/atom_hud/proc/show_hud_images_after_cooldown(M)
	if(queued_to_see[M])
		queued_to_see -= M
		next_time_allowed[M] = world.time + ADD_HUD_TO_COOLDOWN
		for(var/atom/A in hudatoms)
			add_to_single_hud(M, A)

/datum/atom_hud/proc/add_to_hud(atom/A)
	if(!A)
		return FALSE
	hudatoms |= A
	for(var/mob/M in hudusers)
		if(!queued_to_see[M])
			add_to_single_hud(M, A)
	return TRUE

/datum/atom_hud/proc/add_to_single_hud(mob/M, atom/A) //unsafe, no sanity apart from client
	if(!M || !M.client || !A)
		return
	for(var/i in hud_icons)
		if(A.hud_list[i])
			M.client.images |= A.hud_list[i]

//MOB PROCS
/mob/proc/reload_huds()
	for(var/datum/atom_hud/hud in GLOB.all_huds)
		if(hud && hud.hudusers[src])
			for(var/atom/A in hud.hudatoms)
				hud.add_to_single_hud(src, A)

/mob/dead/new_player/reload_huds()
	return

/mob/proc/add_click_catcher()
	client.screen += client.void

/mob/dead/new_player/add_click_catcher()
	return