symbiotic regeneration

aquila/aquila.dm

@@ -22,6 +22,7 @@
 #include "code\datum\wires\wires_jukebox.dm"
 #include "code\datums\components\nanites.dm"
 #include "code\datums\diseases\advance\symptoms\fleshgrowth.dm"
+#include "code\datums\diseases\advance\symptoms\heal.dm"
 #include "code\datums\diseases\transformation.dm"
 #include "code\datums\ai_laws.dm"
 #include "code\datums\dna.dm"

aquila/code/datums/diseases/advance/symptoms/heal.dm

@@ -0,0 +1,55 @@
+/datum/symptom/heal/symbiotic
+	name = "Symbiotic Regeneration"
+	desc = "The virus forms a symbiotic relationship with vital organs in the host's body, accelerating the host's natural healing processes while resting."
+	stealth = -3
+	resistance = -1
+	stage_speed = 2
+	transmission = -4
+
+	level = 3
+	passive_message = "<span class='notice'>You feel calm."
+
+	/// When was the last time the affected mob moved?
+	var/last_moved = 0
+	/// How long do you need to stand still to start healing?
+	var/heal_delay = 3 SECONDS
+
+	threshold_desc = list(
+		"Stage speed 9" = "Shorter delay until healing starts.",
+		"Resistance 9" = "Increased rate of healing.",
+	)
+
+/datum/symptom/heal/symbiotic/Start(datum/disease/advance/A)
+	. = ..()
+	if(!.)
+		return
+	if(A.stealth >= 5) //stronger healing
+		heal_delay = 1 SECONDS
+	if(A.resistance >= 10) //no delay
+		power = 3
+	RegisterSignal(A.affected_mob, COMSIG_MOB_CLIENT_PRE_MOVE, PROC_REF(on_move))
+
+/datum/symptom/heal/symbiotic/End(datum/disease/advance/A)
+	UnregisterSignal(A.affected_mob, COMSIG_MOB_CLIENT_PRE_MOVE)
+	return ..()
+
+/datum/symptom/heal/symbiotic/proc/on_move(mob/living/mover, dir)
+	last_moved = world.time
+
+/datum/symptom/heal/symbiotic/CanHeal(datum/disease/advance/A)
+	if(last_moved + heal_delay > world.time)
+		return FALSE
+	return power
+
+/datum/symptom/heal/symbiotic/Heal(mob/living/carbon/M, datum/disease/advance/A, actual_power)
+	if(M.health == M.maxHealth)
+		return
+	if(last_moved + heal_delay > world.time)
+		return
+
+	if(M.getBruteLoss() || M.getFireLoss() || M.getToxLoss())
+		var/heal_amount = actual_power * 0.5
+		M.heal_bodypart_damage(heal_amount, heal_amount, required_status = BODYTYPE_ORGANIC)
+		M.adjustToxLoss(-heal_amount)
+		return TRUE
+	return FALSE // stop healing if there isn't any damage to heal