Bioscrambler Anomaly chases you (#82555)

## About The Pull Request

I heard reports that people just ignore the bioscrambler anomaly because
basically you just don't go into that room any more and depending on
where it spawned, that's no big deal.
That won't do.

Now the Bioscrambler will be attracted to the nearest sign of advanced
thinking life (read: nearest humanoid mob controlled by a player) and
will very slowly pursue them, travelling through walls and obstacles in
order to do so.

Also if it decides to target you, you will get a foreboding psychic
warning like with the dark matteor, because I think it's funny for dire
warnings to have multiple obscuring sources.

The Bioscrambler can be blocked with containment fields if you want to
make an overly-elaborate pen for it.
To accomplish this I refactored containment fields a little bit to apply
turf traits instead of making four different `locate()` checks for
different objects. Those files smell bad.

Oh also I moved the dullahan organs to the Bioscrambler blacklist
because they runtimed while I was testing it (see also: my other
incoming PRs) and I can't see any other reasonable way to fix it (they
expect to be in an abstract body zone...)

## Why It's Good For The Game

Anomalies are generally meant to be problems that you deal with or face
some kind of consequence.
Because the Bioscrambler isn't a timed anomaly with a dramatic
detonation effect, being spawned in a poorly-trafficked area could
simply mean that it isn't a problem to anyone.
Now it will make sure that it is a problem for someone until someone
gets rid of it.

I thought this solution was funnier than making it do something zany if
you leave it alone for 3 minutes.

## Changelog

🆑
balance: The Bioscrambler will now actively attempt to get closer to
living targets rather than chilling in a closet nobody goes into (unless
you trap it in a containment field).
balance: Because it can now travel through walls, the Bioscrambler will
no longer transform you THROUGH walls.
/🆑

code/__DEFINES/research/anomalies.dm

@@ -34,10 +34,13 @@ GLOBAL_LIST_INIT(bioscrambler_organs_blacklist, typecacheof(list (
 	/obj/item/organ/internal/brain,
 	/obj/item/organ/internal/body_egg,
 	/obj/item/organ/internal/cyberimp,
+	/obj/item/organ/internal/ears/dullahan,
+	/obj/item/organ/internal/eyes/dullahan,
 	/obj/item/organ/internal/heart/cursed,
 	/obj/item/organ/internal/heart/demon,
 	/obj/item/organ/internal/lungs,
 	/obj/item/organ/internal/monster_core,
+	/obj/item/organ/internal/tongue/dullahan,
 	/obj/item/organ/internal/vocal_cords/colossus,
 	/obj/item/organ/internal/zombie_infection,
 )))

code/__DEFINES/traits/declarations.dm

@@ -813,6 +813,9 @@ Remember to update _globalvars/traits.dm if you're adding/removing/renaming trai
 ///Trait applied to turfs when an atmos holosign is placed on them. It will stop firedoors from closing.
 #define TRAIT_FIREDOOR_STOP "firedoor_stop"
 
+///Trait applied to turf blocked by a containment field
+#define TRAIT_CONTAINMENT_FIELD "containment_field"
+
 /// Trait applied when the MMI component is added to an [/obj/item/integrated_circuit]
 #define TRAIT_COMPONENT_MMI "component_mmi"
 

code/_globalvars/traits/_traits.dm

@@ -599,6 +599,7 @@ GLOBAL_LIST_INIT(traits_by_type, list(
 	),
 	/turf = list(
 		"TRAIT_CHASM_STOPPED" = TRAIT_CHASM_STOPPED,
+		"TRAIT_CONTAINMENT_FIELD" = TRAIT_CONTAINMENT_FIELD,
 		"TRAIT_FIREDOOR_STOP" = TRAIT_FIREDOOR_STOP,
 		"TRAIT_HYPERSPACE_STOPPED" = TRAIT_HYPERSPACE_STOPPED,
 		"TRAIT_IMMERSE_STOPPED" = TRAIT_IMMERSE_STOPPED,

code/datums/components/singularity.dm

@@ -360,8 +360,9 @@
 			target = potentially_closer
 	//if we lost that target get a new one
 	if(!target || QDELETED(target))
-		target = find_new_target()
-		foreboding_nosebleed(target)
+		var/mob/living/new_target = find_new_target()
+		new_target?.ominous_nosebleed()
+		target = new_target
 	return ..()
 
 ///Searches the living list for the closest target, and begins chasing them down.
@@ -380,22 +381,6 @@
 			closest_target = target
 	return closest_target
 
-/// gives a little fluff warning that someone is being hunted.
-/datum/component/singularity/bloodthirsty/proc/foreboding_nosebleed(mob/living/target)
-	if(!iscarbon(target))
-		to_chat(target, span_warning("You feel a bit nauseous for just a moment."))
-		return
-	var/mob/living/carbon/carbon_target = target
-	var/obj/item/bodypart/head = carbon_target.get_bodypart(BODY_ZONE_HEAD)
-	if(head)
-		if(HAS_TRAIT(carbon_target, TRAIT_NOBLOOD))
-			to_chat(carbon_target, span_notice("You get a headache."))
-			return
-		head.adjustBleedStacks(5)
-		carbon_target.visible_message(span_notice("[carbon_target] gets a nosebleed."), span_warning("You get a nosebleed."))
-		return
-	to_chat(target, span_warning("You feel a bit nauseous for just a moment."))
-
 #undef CHANCE_TO_MOVE_TO_TARGET
 #undef CHANCE_TO_MOVE_TO_TARGET_BLOODTHIRSTY
 #undef CHANCE_TO_CHANGE_TARGET_BLOODTHIRSTY

code/game/machinery/shieldgen.dm

@@ -364,11 +364,8 @@
 			visible_message(span_danger("[src] shuts down due to lack of power!"), \
 				"If this message is ever seen, something is wrong.",
 				span_hear("You hear heavy droning fade out."))
-			active = FALSE
+			deactivate()
 			log_game("[src] deactivated due to lack of power at [AREACOORD(src)]")
-			for(var/d in GLOB.cardinals)
-				cleanup_field(d)
-			update_appearance()
 	else
 		update_appearance()
 		for(var/d in GLOB.cardinals)
@@ -463,7 +460,6 @@
 			balloon_alert(user, "malfunctioning!")
 		else
 			balloon_alert(user, "no access!")
-
 		return
 
 	add_fingerprint(user)
@@ -493,13 +489,13 @@
 		user.visible_message(span_notice("[user] turned \the [src] off."), \
 			span_notice("You turn off \the [src]."), \
 			span_hear("You hear heavy droning fade out."))
-		active = FALSE
+		deactivate()
 		user.log_message("deactivated [src].", LOG_GAME)
 	else
 		user.visible_message(span_notice("[user] turned \the [src] on."), \
 			span_notice("You turn on \the [src]."), \
 			span_hear("You hear heavy droning."))
-		active = ACTIVE_SETUPFIELDS
+		activate()
 		user.log_message("activated [src].", LOG_GAME)
 	add_fingerprint(user)
 
@@ -513,6 +509,19 @@
 	balloon_alert(user, "access controller shorted")
 	return TRUE
 
+/// Turn the machine on with side effects
+/obj/machinery/power/shieldwallgen/proc/activate()
+	active = ACTIVE_SETUPFIELDS
+	AddElement(/datum/element/give_turf_traits, string_list(list(TRAIT_CONTAINMENT_FIELD)))
+
+/// Turn the machine off with side effects
+/obj/machinery/power/shieldwallgen/proc/deactivate()
+	active = FALSE
+	for(var/d in GLOB.cardinals)
+		cleanup_field(d)
+	update_appearance()
+	RemoveElement(/datum/element/give_turf_traits, string_list(list(TRAIT_CONTAINMENT_FIELD)))
+
 //////////////Containment Field START
 /obj/machinery/shieldwall
 	name = "shield wall"
@@ -538,6 +547,7 @@
 		L.investigate_log("has been gibbed by [src].", INVESTIGATE_DEATHS)
 		L.gib(DROP_ALL_REMAINS)
 	RegisterSignal(src, COMSIG_ATOM_SINGULARITY_TRY_MOVE, PROC_REF(block_singularity))
+	AddElement(/datum/element/give_turf_traits, string_list(list(TRAIT_CONTAINMENT_FIELD)))
 
 /obj/machinery/shieldwall/Destroy()
 	gen_primary = null

code/game/objects/effects/anomalies/_anomalies.dm

@@ -23,6 +23,8 @@
 	var/immortal = FALSE
 	///Do we stay in one place?
 	var/immobile = FALSE
+	///Chance per second that we will move
+	var/move_chance = ANOMALY_MOVECHANCE
 
 /obj/effect/anomaly/Initialize(mapload, new_lifespan, drops_core = TRUE)
 	. = ..()
@@ -76,8 +78,12 @@
 	return ..()
 
 /obj/effect/anomaly/proc/anomalyEffect(seconds_per_tick)
-	if(!immobile && SPT_PROB(ANOMALY_MOVECHANCE, seconds_per_tick))
-		step(src,pick(GLOB.alldirs))
+	if(SPT_PROB(move_chance, seconds_per_tick))
+		move_anomaly()
+
+/// Move in a direction
+/obj/effect/anomaly/proc/move_anomaly()
+	step(src, pick(GLOB.alldirs))
 
 /obj/effect/anomaly/proc/detonate()
 	return

code/game/objects/effects/anomalies/anomalies_bioscrambler.dm

@@ -4,6 +4,10 @@
 	icon_state = "bioscrambler"
 	aSignal = /obj/item/assembly/signaler/anomaly/bioscrambler
 	immortal = TRUE
+	pass_flags = PASSTABLE | PASSGLASS | PASSGRILLE | PASSCLOSEDTURF | PASSMACHINE | PASSSTRUCTURE | PASSDOORS
+	layer = ABOVE_MOB_LAYER
+	/// Who are we moving towards?
+	var/datum/weakref/pursuit_target
 	/// Cooldown for every anomaly pulse
 	COOLDOWN_DECLARE(pulse_cooldown)
 	/// How many seconds between each anomaly pulses
@@ -11,11 +15,52 @@
 	/// Range of the anomaly pulse
 	var/range = 5
 
+/obj/effect/anomaly/bioscrambler/Initialize(mapload, new_lifespan, drops_core)
+	. = ..()
+	pursuit_target = WEAKREF(find_nearest_target())
+
 /obj/effect/anomaly/bioscrambler/anomalyEffect(seconds_per_tick)
 	. = ..()
 	if(!COOLDOWN_FINISHED(src, pulse_cooldown))
 		return
 
 	COOLDOWN_START(src, pulse_cooldown, pulse_delay)
-	for(var/mob/living/carbon/nearby in range(range, src))
+	for(var/mob/living/carbon/nearby in hearers(range, src))
 		nearby.bioscramble(name)
+
+/obj/effect/anomaly/bioscrambler/move_anomaly()
+	var/mob/living/current_target = pursuit_target?.resolve()
+	if (QDELETED(current_target))
+		pursuit_target = null
+	if (isnull(pursuit_target) || prob(20))
+		var/mob/living/new_target = find_nearest_target()
+		if (isnull(new_target))
+			pursuit_target = null
+		else if (new_target != current_target)
+			current_target = new_target
+			pursuit_target = WEAKREF(new_target)
+			new_target.ominous_nosebleed()
+	if (isnull(pursuit_target))
+		return
+	var/turf/step_turf = get_step(src, get_dir(src, current_target))
+	if (!HAS_TRAIT(step_turf, TRAIT_CONTAINMENT_FIELD))
+		Move(step_turf)
+
+/// Returns the closest conscious carbon on our z level or null if there somehow isn't one
+/obj/effect/anomaly/bioscrambler/proc/find_nearest_target()
+	var/closest_distance = INFINITY
+	var/mob/living/carbon/closest_target = null
+	for(var/mob/living/carbon/target in GLOB.player_list)
+		if (target.z != z)
+			continue
+		if (target.status_effects & GODMODE)
+			continue	
+		if (target.stat >= UNCONSCIOUS)
+			continue // Don't just haunt a corpse
+		var/distance_from_target = get_dist(src, target)
+		if(distance_from_target >= closest_distance)
+			continue
+		closest_distance = distance_from_target
+		closest_target = target
+
+	return closest_target

code/modules/mob/living/carbon/carbon.dm

@@ -1477,3 +1477,13 @@
 	if (!IS_ORGANIC_LIMB(target_part) || (target_part.bodypart_flags & BODYPART_PSEUDOPART))
 		return FALSE
 	return ..()
+
+/mob/living/carbon/ominous_nosebleed()
+	var/obj/item/bodypart/head = get_bodypart(BODY_ZONE_HEAD)
+	if(isnull(head))
+		return ..()
+	if(HAS_TRAIT(src, TRAIT_NOBLOOD))
+		to_chat(src, span_notice("You get a headache."))
+		return
+	head.adjustBleedStacks(5)
+	visible_message(span_notice("[src] gets a nosebleed."), span_warning("You get a nosebleed."))

code/modules/mob/living/living.dm

@@ -2426,6 +2426,10 @@ GLOBAL_LIST_EMPTY(fire_appearances)
 		apply_damage(rand(5,10), BRUTE, BODY_ZONE_CHEST)
 		lattice.deconstruct(FALSE)
 
+/// Prints an ominous message if something bad is going to happen to you
+/mob/living/proc/ominous_nosebleed()
+	to_chat(src, span_warning("You feel a bit nauseous for just a moment."))
+
 /**
  * Proc used by different station pets such as Ian and Poly so that some of their data can persist between rounds.
  * This base definition only contains a trait and comsig to stop memory from being (over)written.

code/modules/power/singularity/containment_field.dm

@@ -29,6 +29,7 @@
 		COMSIG_ATOM_ENTERED = PROC_REF(on_entered),
 	)
 	AddElement(/datum/element/connect_loc, loc_connections)
+	AddElement(/datum/element/give_turf_traits, string_list(list(TRAIT_CONTAINMENT_FIELD)))
 
 /obj/machinery/field/containment/Destroy()
 	if(field_gen_1)

code/modules/power/singularity/field_generator.dm

@@ -208,6 +208,7 @@ no power level overlay is currently in the overlays list.
 	air_update_turf(TRUE, FALSE)
 	INVOKE_ASYNC(src, PROC_REF(cleanup))
 	addtimer(CALLBACK(src, PROC_REF(cool_down)), 5 SECONDS)
+	RemoveElement(/datum/element/give_turf_traits, string_list(list(TRAIT_CONTAINMENT_FIELD)))
 
 /obj/machinery/field/generator/proc/cool_down()
 	if(active || warming_up <= 0)
@@ -220,6 +221,7 @@ no power level overlay is currently in the overlays list.
 /obj/machinery/field/generator/proc/turn_on()
 	active = FG_CHARGING
 	addtimer(CALLBACK(src, PROC_REF(warm_up)), 5 SECONDS)
+	AddElement(/datum/element/give_turf_traits, string_list(list(TRAIT_CONTAINMENT_FIELD)))
 
 /obj/machinery/field/generator/proc/warm_up()
 	if(!active)

code/modules/power/singularity/singularity.dm

@@ -386,16 +386,8 @@
 /obj/singularity/proc/can_move(turf/considered_turf)
 	if(!considered_turf)
 		return FALSE
-	if((locate(/obj/machinery/field/containment) in considered_turf) || (locate(/obj/machinery/shieldwall) in considered_turf))
+	if (HAS_TRAIT(considered_turf, TRAIT_CONTAINMENT_FIELD))
 		return FALSE
-	else if(locate(/obj/machinery/field/generator) in considered_turf)
-		var/obj/machinery/field/generator/check_generator = locate(/obj/machinery/field/generator) in considered_turf
-		if(check_generator?.active)
-			return FALSE
-	else if(locate(/obj/machinery/power/shieldwallgen) in considered_turf)
-		var/obj/machinery/power/shieldwallgen/check_shield = locate(/obj/machinery/power/shieldwallgen) in considered_turf
-		if(check_shield?.active)
-			return FALSE
 	return TRUE
 
 /obj/singularity/proc/event()