[MIRROR] Fixes AI lag by re-adding idle mode to all AI that was lost with the simple mob to basic mob conversion.

code/__DEFINES/ai/ai.dm

@@ -8,11 +8,16 @@
 #define AI_STATUS_ON "ai_on"
 ///The AI is currently offline for any reason.
 #define AI_STATUS_OFF "ai_off"
+///The AI is currently in idle mode.
+#define AI_STATUS_IDLE "ai_idle"
 
 ///For JPS pathing, the maximum length of a path we'll try to generate. Should be modularized depending on what we're doing later on
 #define AI_MAX_PATH_LENGTH 30 // 30 is possibly overkill since by default we lose interest after 14 tiles of distance, but this gives wiggle room for weaving around obstacles
 #define AI_BOT_PATH_LENGTH 150
 
+// How far should we, by default, be looking for interesting things to de-idle?
+#define AI_DEFAULT_INTERESTING_DIST 14
+
 ///Cooldown on planning if planning failed last time
 
 #define AI_FAILED_PLANNING_COOLDOWN (1.5 SECONDS)

code/controllers/subsystem/ai_controllers.dm

@@ -13,9 +13,15 @@ SUBSYSTEM_DEF(ai_controllers)
 	var/list/ai_controllers_by_status = list(
 		AI_STATUS_ON = list(),
 		AI_STATUS_OFF = list(),
+		AI_STATUS_IDLE = list(),
 	)
 	///Assoc List of all AI controllers and the Z level they are on, which we check when someone enters/leaves a Z level to turn them on/off.
 	var/list/ai_controllers_by_zlevel = list()
+	/// The tick cost of all active AI, calculated on fire.
+	var/cost_on
+	/// The tick cost of all idle AI, calculated on fire.
+	var/cost_idle
+
 
 /datum/controller/subsystem/ai_controllers/Initialize()
 	setup_subtrees()
@@ -24,10 +30,20 @@ SUBSYSTEM_DEF(ai_controllers)
 /datum/controller/subsystem/ai_controllers/stat_entry(msg)
 	var/list/active_list = ai_controllers_by_status[AI_STATUS_ON]
 	var/list/inactive_list = ai_controllers_by_status[AI_STATUS_OFF]
-	msg = "Active AIs:[length(active_list)]|Inactive:[length(inactive_list)]"
+	var/list/idle_list = ai_controllers_by_status[AI_STATUS_IDLE]
+	msg = "Active AIs:[length(active_list)]/[round(cost_on,1)]%|Inactive:[length(inactive_list)]|Idle:[length(idle_list)]/[round(cost_idle,1)]%"
 	return ..()
 
 /datum/controller/subsystem/ai_controllers/fire(resumed)
+	var/timer = TICK_USAGE_REAL
+	for(var/datum/ai_controller/ai_controller as anything in ai_controllers_by_status[AI_STATUS_IDLE])
+		for(var/client/client_found in GLOB.clients)
+			if(get_dist(get_turf(client_found.mob), get_turf(ai_controller.pawn)) <= ai_controller.interesting_dist)
+				ai_controller.set_ai_status(AI_STATUS_ON)
+				break
+	cost_idle = MC_AVERAGE(cost_idle, TICK_DELTA_TO_MS(TICK_USAGE_REAL - timer))
+
+	timer = TICK_USAGE_REAL
 	for(var/datum/ai_controller/ai_controller as anything in ai_controllers_by_status[AI_STATUS_ON])
 		if(!COOLDOWN_FINISHED(ai_controller, failed_planning_cooldown))
 			continue
@@ -37,6 +53,15 @@ SUBSYSTEM_DEF(ai_controllers)
 		ai_controller.SelectBehaviors(wait * 0.1)
 		if(!LAZYLEN(ai_controller.current_behaviors)) //Still no plan
 			COOLDOWN_START(ai_controller, failed_planning_cooldown, AI_FAILED_PLANNING_COOLDOWN)
+		if(ai_controller.can_idle)
+			var/found_interesting = FALSE
+			for(var/client/client_found in GLOB.clients)
+				if(get_dist(get_turf(client_found.mob), get_turf(ai_controller.pawn)) <= ai_controller.interesting_dist)
+					found_interesting = TRUE
+					break
+			if(!found_interesting)
+				ai_controller.set_ai_status(AI_STATUS_IDLE)
+	cost_on = MC_AVERAGE(cost_on, TICK_DELTA_TO_MS(TICK_USAGE_REAL - timer))
 
 ///Creates all instances of ai_subtrees and assigns them to the ai_subtrees list.
 /datum/controller/subsystem/ai_controllers/proc/setup_subtrees()

code/datums/ai/_ai_controller.dm

@@ -56,6 +56,10 @@ multiple modular subtrees with behaviors
 	// The variables below are fucking stupid and should be put into the blackboard at some point.
 	///AI paused time
 	var/paused_until = 0
+	///Can this AI idle?
+	var/can_idle = TRUE
+	///What distance should we be checking for interesting things when considering idling/deidling? Defaults to AI_DEFAULT_INTERESTING_DIST
+	var/interesting_dist = AI_DEFAULT_INTERESTING_DIST
 
 /datum/ai_controller/New(atom/new_pawn)
 	change_ai_movement_type(ai_movement)
@@ -175,7 +179,7 @@ multiple modular subtrees with behaviors
 		SSai_controllers.ai_controllers_by_zlevel[new_turf.z] += src
 		var/new_level_clients = SSmobs.clients_by_zlevel[new_turf.z].len
 		if(new_level_clients)
-			set_ai_status(AI_STATUS_ON)
+			set_ai_status(AI_STATUS_IDLE)
 		else
 			set_ai_status(AI_STATUS_OFF)
 
@@ -319,6 +323,9 @@ multiple modular subtrees with behaviors
 		if(AI_STATUS_OFF)
 			STOP_PROCESSING(SSai_behaviors, src)
 			CancelActions()
+		if(AI_STATUS_IDLE)
+			STOP_PROCESSING(SSai_behaviors, src)
+			CancelActions()
 
 /datum/ai_controller/proc/PauseAi(time)
 	paused_until = world.time + time
@@ -378,7 +385,7 @@ multiple modular subtrees with behaviors
 /datum/ai_controller/proc/on_sentience_lost()
 	SIGNAL_HANDLER
 	UnregisterSignal(pawn, COMSIG_MOB_LOGOUT)
-	set_ai_status(AI_STATUS_ON) //Can't do anything while player is connected
+	set_ai_status(AI_STATUS_IDLE) //Can't do anything while player is connected
 	RegisterSignal(pawn, COMSIG_MOB_LOGIN, PROC_REF(on_sentience_gained))
 
 // Turn the controller off if the pawn has been qdeleted

code/datums/brain_damage/special.dm

@@ -514,7 +514,7 @@
 	owner.grant_language(/datum/language/monkey, UNDERSTOOD_LANGUAGE, TRAUMA_TRAIT)
 	owner.ai_controller.set_blackboard_key(BB_MONKEY_AGGRESSIVE, prob(75))
 	if(owner.ai_controller.ai_status == AI_STATUS_OFF)
-		owner.ai_controller.set_ai_status(AI_STATUS_ON)
+		owner.ai_controller.set_ai_status(AI_STATUS_IDLE)
 		owner.log_message("became controlled by monkey instincts ([owner.ai_controller.blackboard[BB_MONKEY_AGGRESSIVE] ? "aggressive" : "docile"])", LOG_ATTACK, color = "orange")
 		to_chat(owner, span_warning("You feel the urge to act on your primal instincts..."))
 	// extend original timer if we roll the effect while it's already ongoing

code/modules/mob/living/basic/bots/bot_ai.dm

@@ -27,6 +27,7 @@
 	var/current_pathing_attempts = 0
 	///if we cant reach it after this many attempts, add it to our ignore list
 	var/max_pathing_attempts = 25
+	can_idle = FALSE // we want these to be running always
 
 /datum/ai_controller/basic_controller/bot/TryPossessPawn(atom/new_pawn)
 	. = ..()

code/modules/mob/living/basic/lavaland/mook/mook_ai.dm

@@ -26,6 +26,7 @@ GLOBAL_LIST_INIT(mook_commands, list(
 		/datum/ai_planning_subtree/mine_walls/mook,
 		/datum/ai_planning_subtree/wander_away_from_village,
 	)
+	can_idle = FALSE // these guys are intended to operate even if nobody's around
 
 ///check for faction if not a ash walker, otherwise just attack
 /datum/targeting_strategy/basic/mook/faction_check(datum/ai_controller/controller, mob/living/living_mob, mob/living/the_target)

code/modules/mob/living/basic/ruin_defender/flesh.dm

@@ -173,7 +173,7 @@
 /mob/living/basic/living_limb_flesh/proc/wake_up(atom/limb)
 	visible_message(span_warning("[src] begins flailing around!"))
 	Shake(6, 6, 0.5 SECONDS)
-	ai_controller.set_ai_status(AI_STATUS_ON)
+	ai_controller.set_ai_status(AI_STATUS_IDLE)
 	forceMove(limb.drop_location())
 	qdel(limb)
 

code/modules/unit_tests/mouse_bite_cable.dm

@@ -21,6 +21,7 @@
 	var/fake_dt = SSai_controllers.wait * 0.1
 	// Set AI - AIs by default are off in z-levels with no client, we have to force it on.
 	biter.ai_controller.set_ai_status(AI_STATUS_ON)
+	biter.ai_controller.can_idle = FALSE
 	// Select behavior - this will queue finding the cable
 	biter.ai_controller.SelectBehaviors(fake_dt)
 	// Process behavior - this will execute the "locate the cable" behavior