adds spawners for NPC zombies (#25873)

* lmao

* lol

* yes

* yeah sure

* fix

* Apply suggestions from code review

Co-authored-by: 1080pCat <96908085+1080pCat@users.noreply.github.com>
Signed-off-by: Contrabang <91113370+Contrabang@users.noreply.github.com>

* lewc review + duplicate

---------

Signed-off-by: Contrabang <91113370+Contrabang@users.noreply.github.com>
Co-authored-by: 1080pCat <96908085+1080pCat@users.noreply.github.com>

code/modules/antagonists/zombie/zombie_spells.dm

@@ -128,7 +128,7 @@
 
 
 /obj/item/zombie_claw/proc/try_infect(mob/living/carbon/human/target, mob/living/user)
-	if(!ishuman(target))
+	if(!ishuman(target) || HAS_TRAIT(user, TRAIT_NON_INFECTIOUS_ZOMBIE))
 		return
 	if(!(user.zone_selected in list(BODY_ZONE_CHEST, BODY_ZONE_HEAD)))
 		to_chat(user, "<span class='warning zombie'>Our infection cannot spread without their head or chest.</span>")

code/modules/awaymissions/mob_spawn.dm

@@ -183,6 +183,8 @@
 	assignedrole = "Ghost Role"
 
 	var/husk = null
+	/// Should we fully dna-scramble these humans?
+	var/dna_scrambled = FALSE
 	//these vars are for lazy mappers to override parts of the outfit
 	//these cannot be null by default, or mappers cannot set them to null if they want nothing in that slot
 	var/uniform = -1
@@ -259,6 +261,9 @@
 		H.s_tone = random_skin_tone()
 		H.skin_colour = rand_hex_color()
 
+	if(dna_scrambled)
+		H.get_dna_scrambled()
+
 	H.update_body(rebuild_base = TRUE)
 
 	if(outfit)
@@ -581,6 +586,28 @@
 	mob_species = /datum/species/skeleton/brittle
 	mob_gender = NEUTER
 
+/obj/effect/mob_spawn/human/alive/zombie
+	name = "NPC Zombie (Infectious)"
+	icon = 'icons/mob/human.dmi'
+	icon_state = "zombie_s"
+	roundstart = TRUE
+	dna_scrambled = TRUE
+
+/obj/effect/mob_spawn/human/alive/zombie/equip(mob/living/carbon/human/H)
+	ADD_TRAIT(H, TRAIT_NPC_ZOMBIE, ROUNDSTART_TRAIT)
+	H.ForceContractDisease(new /datum/disease/zombie)
+	for(var/datum/disease/zombie/zomb in H.viruses)
+		zomb.stage = 8
+
+	return ..()
+
+/obj/effect/mob_spawn/human/alive/zombie/non_infectious
+	name = "NPC Zombie (Non-infectious)"
+
+/obj/effect/mob_spawn/human/alive/zombie/non_infectious/equip(mob/living/carbon/human/H)
+	ADD_TRAIT(H, TRAIT_NON_INFECTIOUS_ZOMBIE, ROUNDSTART_TRAIT)
+	return ..()
+
 ////////Non-human spawners////////
 
 /obj/effect/mob_spawn/mouse

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

@@ -2046,3 +2046,13 @@ Eyes need to have significantly high darksight to shine unless the mob has the X
 		return dna.species.unarmed
 	return zombie.claw_attack
 
+/mob/living/carbon/human/proc/get_dna_scrambled()
+	scramble(1, src, 100)
+	real_name = random_name(gender, dna.species.name) // Give them a name that makes sense for their species.
+	sync_organ_dna(assimilate = 1)
+	update_body()
+	reset_hair() // No more winding up with hairstyles you're not supposed to have, and blowing your cover.
+	reset_markings() // ...Or markings.
+	dna.ResetUIFrom(src)
+	flavor_text = ""
+

code/modules/mob/living/carbon/human/species/_species.dm

@@ -1087,17 +1087,18 @@ It'll return null if the organ doesn't correspond, so include null checks when u
 			playsound(user.loc, 'sound/misc/moist_impact.ogg', 50, TRUE)
 			user.do_attack_animation(target, ATTACK_EFFECT_BITE)
 			target.apply_damage(20, BRUTE, user.zone_selected)
-			if(!target.HasDisease(/datum/disease/zombie))
-				var/datum/disease/zombie/zomb = new /datum/disease/zombie
-				if(target.CanContractDisease(zomb)) // biosuit aint going to protect you buddy
-					target.ForceContractDisease(zomb)
-					target.Dizzy(10 SECONDS)
-					target.Confused(10 SECONDS)
-				else
-					qdel(zomb)
+			if(!HAS_TRAIT(user, TRAIT_NON_INFECTIOUS_ZOMBIE))
+				if(!target.HasDisease(/datum/disease/zombie))
+					var/datum/disease/zombie/zomb = new /datum/disease/zombie
+					if(target.CanContractDisease(zomb)) // biosuit aint going to protect you buddy
+						target.ForceContractDisease(zomb)
+						target.Dizzy(10 SECONDS)
+						target.Confused(10 SECONDS)
+					else
+						qdel(zomb)
 
-			for(var/datum/disease/zombie/zomb in target.viruses)
-				zomb.stage = max(rand(3, 4), zomb.stage)
+				for(var/datum/disease/zombie/zomb in target.viruses)
+					zomb.stage = max(rand(3, 4), zomb.stage)
 
 			qdel(grabby)
 			return TRUE
@@ -1126,12 +1127,13 @@ It'll return null if the organ doesn't correspond, so include null checks when u
 
 		eat_brain.custom_pain("OH GOD!!! THEY'RE EATING MY [uppertext(eat_brain.name)]!!") // gnarly
 		user.visible_message("<span class='danger'>[user] digs their claws into [target]'s [brain_house.name], eating their [eat_brain]!</span>", "<span class='danger zombie'>We feast on [target]'s brains.</span>")
-		if(!target.HasDisease(/datum/disease/zombie))
-			var/datum/disease/zombie/zomb = new /datum/disease/zombie
-			target.ContractDisease(zomb)
+		if(!HAS_TRAIT(user, TRAIT_NON_INFECTIOUS_ZOMBIE))
+			if(!target.HasDisease(/datum/disease/zombie))
+				var/datum/disease/zombie/zomb = new /datum/disease/zombie
+				target.ContractDisease(zomb)
 
-		for(var/datum/disease/zombie/zomb in target.viruses)
-			zomb.stage = max(5, zomb.stage)
+			for(var/datum/disease/zombie/zomb in target.viruses)
+				zomb.stage = max(5, zomb.stage)
 
 		if(!do_mob(user, target, 1 SECONDS))
 			return