Advanced mob laziness

code/modules/mob/living/living.dm

@@ -1048,6 +1048,13 @@
 		if (client)
 			if (new_z)
 				SSmobs.clients_by_zlevel[new_z] += src
+				for (var/I in length(SSidlenpcpool.idle_mobs_by_zlevel[new_z]) to 1 step -1) //Backwards loop because we're removing (guarantees optimal rather than worst-case performance), it's fine to use .len here but doesn't compile on 511
+					var/mob/living/simple_animal/SA = SSidlenpcpool.idle_mobs_by_zlevel[new_z][I]
+					if (SA)
+						SA.toggle_ai(AI_ON) // Guarantees responsiveness for when appearing right next to mobs
+					else
+						SSidlenpcpool.idle_mobs_by_zlevel[new_z] -= SA
+
 			registered_z = new_z
 		else
 			registered_z = null

code/modules/mob/living/simple_animal/hostile/hostile.dm

@@ -288,7 +288,7 @@
 		if(search_objects)//Turn off item searching and ignore whatever item we were looking at, we're more concerned with fight or flight
 			target = null
 			LoseSearchObjects()
-		if(AIStatus == AI_IDLE)
+		if(AIStatus != AI_ON && AIStatus != AI_OFF)
 			toggle_ai(AI_ON)
 			FindTarget()
 		else if(target != null && prob(40))//No more pulling a mob forever and having a second player attack it, it can switch targets now if it finds a more suitable one
@@ -479,6 +479,31 @@ mob/living/simple_animal/hostile/proc/DestroySurroundings() // for use with mega
 
 /mob/living/simple_animal/hostile/consider_wakeup()
 	..()
-	if(AIStatus == AI_IDLE && FindTarget(ListTargets(), 1))
+	var/list/tlist
+	var/turf/T = get_turf(src)
+
+	if (!T)
+		return
+
+	if (!length(SSmobs.clients_by_zlevel[T.z])) // It's fine to use .len here but doesn't compile on 511
+		toggle_ai(AI_Z_OFF)
+		return
+
+	if (isturf(T) && !(T.z in GLOB.station_z_levels))
+		tlist = ListTargetsLazy(T.z)
+	else
+		tlist = ListTargets()
+
+	if(AIStatus == AI_IDLE && FindTarget(tlist, 1))
 		toggle_ai(AI_ON)
 
+/mob/living/simple_animal/hostile/proc/ListTargetsLazy(var/_Z)//Step 1, find out what we can see
+	var/static/hostile_machines = typecacheof(list(/obj/machinery/porta_turret, /obj/mecha, /obj/structure/destructible/clockwork/ocular_warden))
+	. = list()
+	for (var/I in SSmobs.clients_by_zlevel[_Z])
+		var/mob/M = I
+		if (get_dist(M, src) < vision_range)
+			if (isturf(M.loc))
+				. += M
+			else if (M.loc.type in hostile_machines)
+				. += M.loc

code/modules/mob/living/simple_animal/simple_animal.dm

@@ -82,14 +82,18 @@
 	var/dextrous_hud_type = /datum/hud/dextrous
 	var/datum/personal_crafting/handcrafting
 
-	var/AIStatus = AI_ON //The Status of our AI, can be set to AI_ON (On, usual processing), AI_IDLE (Will not process, but will return to AI_ON if an enemy comes near), AI_OFF (Off, Not processing ever)
+	var/AIStatus = AI_ON //The Status of our AI, can be set to AI_ON (On, usual processing), AI_IDLE (Will not process, but will return to AI_ON if an enemy comes near), AI_OFF (Off, Not processing ever), AI_Z_OFF (Temporarily off due to nonpresence of players)
 
 	var/shouldwakeup = FALSE //convenience var for forcibly waking up an idling AI on next check.
 
 	//domestication
 	var/tame = 0
 
+<<<<<<< HEAD
 	no_vore = TRUE
+=======
+	var/my_z // I don't want to confuse this with client registered_z 
+>>>>>>> d03e4ef... Advanced mob laziness (#33574)
 
 /mob/living/simple_animal/Initialize()
 	. = ..()
@@ -544,7 +548,13 @@
 
 /mob/living/simple_animal/proc/toggle_ai(togglestatus)
 	if (AIStatus != togglestatus)
-		if (togglestatus > 0 && togglestatus < 4)
+		if (togglestatus > 0 && togglestatus < 5)
+			if (togglestatus == AI_Z_OFF || AIStatus == AI_Z_OFF)
+				var/turf/T = get_turf(src)
+				if (AIStatus == AI_Z_OFF)
+					SSidlenpcpool.idle_mobs_by_zlevel[T.z] -= src
+				else
+					SSidlenpcpool.idle_mobs_by_zlevel[T.z] += src
 			GLOB.simple_animals[AIStatus] -= src
 			GLOB.simple_animals[togglestatus] += src
 			AIStatus = togglestatus
@@ -559,4 +569,11 @@
 	. = ..()
 	if(!ckey && !stat)//Not unconscious
 		if(AIStatus == AI_IDLE)
-			toggle_ai(AI_ON)
+			toggle_ai(AI_ON)
+
+
+/mob/living/simple_animal/onTransitZ(old_z, new_z)
+	..()
+	if (AIStatus == AI_Z_OFF)
+		SSidlenpcpool[old_z] -= src
+		toggle_ai(initial(AIStatus))