Merge pull request #4076 from Citadel-Station-13/upstream-merge-32858

[MIRROR] Divides species in subtypes, makes viruses able to infect certain subtypes

code/datums/diseases/_MobProcs.dm

@@ -143,14 +143,25 @@
 //Proc to use when you 100% want to infect someone, as long as they aren't immune
 /mob/proc/ForceContractDisease(datum/disease/D)
 	if(!CanContractDisease(D))
-		return 0
+		return FALSE
 	AddDisease(D)
 
 
 /mob/living/carbon/human/CanContractDisease(datum/disease/D)
-	if(dna && (VIRUSIMMUNE in dna.species.species_traits) && !D.bypasses_immunity)
-		return 0
+
+	if(dna)
+		if((VIRUSIMMUNE in dna.species.species_traits) && !D.bypasses_immunity)
+			return FALSE
+
+		var/can_infect = FALSE
+		for(var/host_type in D.infectable_hosts)
+			if(host_type in dna.species.species_traits)
+				can_infect = TRUE
+				break
+		if(!can_infect)
+			return FALSE
+
 	for(var/thing in D.required_organs)
 		if(!((locate(thing) in bodyparts) || (locate(thing) in internal_organs)))
-			return 0
+			return FALSE
 	return ..()

code/datums/diseases/_disease.dm

@@ -30,6 +30,8 @@
 	var/list/required_organs = list()
 	var/needs_all_cures = TRUE
 	var/list/strain_data = list() //dna_spread special bullshit
+	var/list/infectable_hosts = list(SPECIES_ORGANIC) //if the disease can spread on organics, synthetics, or undead
+	var/process_dead = FALSE //if this ticks while the host is dead
 
 /datum/disease/Destroy()
 	affected_mob = null

code/datums/diseases/advance/symptoms/species.dm

@@ -0,0 +1,30 @@
+/datum/symptom/undead_adaptation
+	name = "Necrotic Metabolism"
+	desc = "The virus is able to thrive and act even within dead hosts."
+	stealth = 2
+	resistance = -2
+	stage_speed = 1
+	transmittable = 0
+	level = 5
+	severity = 0
+
+/datum/symptom/undead_adaptation/Start(datum/disease/advance/A)
+	if(!..())
+		return
+	A.process_dead = TRUE
+	A.infectable_hosts |= SPECIES_UNDEAD
+
+/datum/symptom/inorganic_adaptation
+	name = "Inorganic Biology"
+	desc = "The virus can survive and replicate even in an inorganic environment, increasing its resistance and infection rate."
+	stealth = -1
+	resistance = 4
+	stage_speed = -2
+	transmittable = 3
+	level = 5
+	severity = 0
+
+/datum/symptom/inorganic_adaptation/Start(datum/disease/advance/A)
+	if(!..())
+		return
+	A.infectable_hosts |= SPECIES_INORGANIC

code/datums/diseases/beesease.dm

@@ -10,6 +10,7 @@
 	viable_mobtypes = list(/mob/living/carbon/human, /mob/living/carbon/monkey)
 	desc = "If left untreated subject will regurgitate bees."
 	severity = VIRUS_SEVERITY_MEDIUM
+	infectable_hosts = list(SPECIES_ORGANIC, SPECIES_UNDEAD) //bees nesting in corpses
 
 /datum/disease/beesease/stage_act()
 	..()

code/datums/diseases/magnitis.dm

@@ -10,6 +10,8 @@
 	permeability_mod = 0.75
 	desc = "This disease disrupts the magnetic field of your body, making it act as if a powerful magnet. Injections of iron help stabilize the field."
 	severity = VIRUS_SEVERITY_MEDIUM
+	infectable_hosts = list(SPECIES_ORGANIC, SPECIES_ROBOTIC)
+	process_dead = TRUE
 
 /datum/disease/magnitis/stage_act()
 	..()

code/datums/diseases/parrotpossession.dm

@@ -11,6 +11,8 @@
 	viable_mobtypes = list(/mob/living/carbon/human)
 	desc = "Subject is possesed by the vengeful spirit of a parrot. Call the priest."
 	severity = VIRUS_SEVERITY_MEDIUM
+	infectable_hosts = list(SPECIES_ORGANIC, SPECIES_UNDEAD, SPECIES_INORGANIC, SPECIES_ROBOTIC)
+	bypasses_immunity = TRUE //2spook
 	var/mob/living/simple_animal/parrot/Poly/ghost/parrot
 
 /datum/disease/parrot_possession/stage_act()

code/datums/diseases/rhumba_beat.dm

@@ -9,6 +9,7 @@
 	viable_mobtypes = list(/mob/living/carbon/human)
 	permeability_mod = 1
 	severity = VIRUS_SEVERITY_BIOHAZARD
+	process_dead = TRUE
 
 /datum/disease/rhumba_beat/stage_act()
 	..()

code/datums/diseases/transformation.dm

@@ -127,7 +127,7 @@
 	stage4	= list("<span class='danger'>Your skin feels very loose.</span>", "<span class='danger'>You can feel... something...inside you.</span>")
 	stage5	= list("<span class='danger'>Your skin feels as if it's about to burst off!</span>")
 	new_form = /mob/living/silicon/robot
-
+	infectable_hosts = list(SPECIES_ORGANIC, SPECIES_UNDEAD, SPECIES_ROBOTIC)
 
 /datum/disease/transformation/robot/stage_act()
 	..()
@@ -240,3 +240,4 @@
 	stage4	= list("<span class='danger'>You're ravenous.</span>")
 	stage5	= list("<span class='danger'>You have become a morph.</span>")
 	new_form = /mob/living/simple_animal/hostile/morph
+	infectable_hosts = list(SPECIES_ORGANIC, SPECIES_INORGANIC, SPECIES_UNDEAD) //magic!