Skin Masquerade: Epidermal Applicator, Lifelike Quirk, and the Skinmonger Implant (#31185)

* adds the epidermal applicator, lifelike quirk, and skinmonger traitor implant

* lint

* lint

* attack chain fix

* more linty fixes

* more lint

* fix some buggy bugs, synthetic skinned body parts recolor to their host

* make emp on skinmonger work, fix a skinmonger bug

* make bruising / denting examine text not betray the masquerade

* burn away synthetic skin with acid

* comment / code structure / description tweaks

* i sell pharmaceuticals and pharmaceutical accessories

* code review comments

* oops

* god damn it

* god damn it (x2)

* Update code/modules/surgery/organs/augments_internal.dm

Co-authored-by: 1080pCat <96908085+1080pCat@users.noreply.github.com>
Signed-off-by: Pooble <90473506+poobsie@users.noreply.github.com>

* lower syndi level for implant

* Update code/modules/research/designs/medical_designs.dm

Co-authored-by: JimKil3 <47290811+JimKil3@users.noreply.github.com>
Signed-off-by: Pooble <90473506+poobsie@users.noreply.github.com>

* Update code/game/objects/items/tools/epidermal_applicator.dm

Co-authored-by: JimKil3 <47290811+JimKil3@users.noreply.github.com>
Signed-off-by: Pooble <90473506+poobsie@users.noreply.github.com>

* Update code/modules/surgery/organs/organ_external.dm

Co-authored-by: JimKil3 <47290811+JimKil3@users.noreply.github.com>
Signed-off-by: Pooble <90473506+poobsie@users.noreply.github.com>

* Update code/modules/surgery/organs/organ_external.dm

Co-authored-by: JimKil3 <47290811+JimKil3@users.noreply.github.com>
Signed-off-by: Pooble <90473506+poobsie@users.noreply.github.com>

* tweaks for review

* Update code/__DEFINES/dcs/datum_signals.dm

Co-authored-by: PollardTheDragon <144391971+PollardTheDragon@users.noreply.github.com>
Signed-off-by: Pooble <90473506+poobsie@users.noreply.github.com>

---------

Signed-off-by: Pooble <90473506+poobsie@users.noreply.github.com>
Co-authored-by: 1080pCat <96908085+1080pCat@users.noreply.github.com>
Co-authored-by: JimKil3 <47290811+JimKil3@users.noreply.github.com>
Co-authored-by: PollardTheDragon <144391971+PollardTheDragon@users.noreply.github.com>

code/modules/surgery/organs/augments_internal.dm

@@ -1094,6 +1094,182 @@
 	REMOVE_TRAIT(M, TRAIT_IPC_CAN_EAT, "ipc_food[UID()]")
 	return ..()
 
+/obj/item/organ/internal/cyberimp/chest/skinmonger
+	name = "\improper Skinmonger"
+	desc = "A strange implant that continuously produces and replaces synthetic skin. \
+			Will not apply skin to a monitor-shaped head."
+	implant_color = "#FFDDAA"
+	slot = "chest_synthetic_skin"
+	w_class = WEIGHT_CLASS_TINY
+	origin_tech = "materials=6;biotech=7;syndicate=1"
+	augment_icon = "nutripump"
+	/// Whether regeneration is allowed. This is disabled temporarily by an EMP
+	var/regeneration_active = TRUE
+	/// How long to wait after finding a target body part to replace skin on
+	var/regen_cooldown = 30 SECONDS
+	/// Whether we're currently regenerating
+	var/regenerating = FALSE
+	/// Normally synthetic skin doesn't have memory of the identity we're disguised as. This implant does, though
+	var/configured_identity = "Unknown"
+	/// Flag for tracking if we've used up the implant's initial deployment of skin
+	var/initial_surge_used = FALSE
+
+/obj/item/organ/internal/cyberimp/chest/skinmonger/insert(mob/living/carbon/M, special = 0)
+	. = ..()
+
+	if(!initial_surge_used)
+		apply_full_synthetic_skin(M)
+		to_chat(M, SPAN_WARNING("In an instant, a surge of skin wraps around you and binds itself to your body!"))
+		playsound(M, 'sound/surgery/organ2.ogg', 70, TRUE, frequency = 0.8)
+		initial_surge_used = TRUE
+
+/obj/item/organ/internal/cyberimp/chest/skinmonger/remove(mob/living/carbon/M, special = 0)
+	. = ..()
+	regenerating = FALSE
+	remove_all_synthetic_skin(M)
+
+// Called when synthetic skin is removed from any part - starts regeneration cycle
+/obj/item/organ/internal/cyberimp/chest/skinmonger/proc/start_regeneration()
+	if(!regeneration_active || regenerating)
+		return
+
+	regenerating = TRUE
+	// Wait before we trigger the first regen.
+	addtimer(CALLBACK(src, PROC_REF(regenerate_next_part)), regen_cooldown)
+
+/obj/item/organ/internal/cyberimp/chest/skinmonger/proc/regenerate_next_part()
+	if(!owner || !regeneration_active || !regenerating)
+		return
+
+	var/mob/living/carbon/human/H = owner
+	var/list/unskinned_parts = list()
+
+	// Find all robotic parts without synthetic skin.
+	for(var/obj/item/organ/external/E in H.bodyparts)
+		if(!E.is_robotic() || E.has_synthetic_skin)
+			continue
+
+		// Skip monitor heads
+		if(E.limb_name == "head" && E.model)
+			var/datum/robolimb/R = GLOB.all_robolimbs[E.model]
+			if(R && R.is_monitor)
+				continue
+
+		unskinned_parts += E
+
+	// If no parts need skin, kill the regen cycle
+	if(!length(unskinned_parts))
+		regenerating = FALSE
+		return
+
+	// Pick a random part and apply skin
+	var/obj/item/organ/external/chosen_part = pick(unskinned_parts)
+	chosen_part.has_synthetic_skin = TRUE
+	// Apply owner's skin color to synthetic skin
+	if(ishuman(H))
+		chosen_part.synthetic_skin_colour = H.skin_colour
+	// Set identity for head regeneration
+	if(chosen_part.limb_name == "head")
+		var/identity_to_use = configured_identity
+		chosen_part.synthetic_skin_identity = identity_to_use
+		if(ishuman(H))
+			H.real_name = identity_to_use
+
+	// Chest and lower body tied together for regeneration
+	if(chosen_part.limb_name == "chest")
+		var/obj/item/organ/external/groin_limb = H.bodyparts_by_name["groin"]
+		if(groin_limb && groin_limb.is_robotic() && !groin_limb.has_synthetic_skin)
+			groin_limb.has_synthetic_skin = TRUE
+			groin_limb.synthetic_skin_colour = H.skin_colour
+			groin_limb.force_icon = null
+			groin_limb.mob_icon = null
+			groin_limb.compile_icon()
+
+	if(chosen_part.limb_name == "groin")
+		var/obj/item/organ/external/chest_limb = H.bodyparts_by_name["chest"]
+		if(chest_limb && chest_limb.is_robotic() && !chest_limb.has_synthetic_skin)
+			chest_limb.has_synthetic_skin = TRUE
+			chest_limb.synthetic_skin_colour = H.skin_colour
+			chest_limb.force_icon = null
+			chest_limb.mob_icon = null
+			chest_limb.compile_icon()
+
+	// Refresh sprite
+	chosen_part.force_icon = null
+	chosen_part.mob_icon = null
+	chosen_part.compile_icon()
+	H.update_body(rebuild_base = TRUE)
+
+	to_chat(H, SPAN_NOTICE("You feel a wave of synthetic skin gush forth and bind to your [chosen_part.name]."))
+
+	// Schedule next regeneration if more parts need skin. Otherwise, we're done
+	if(length(unskinned_parts) > 1)
+		addtimer(CALLBACK(src, PROC_REF(regenerate_next_part)), regen_cooldown)
+	else
+		regenerating = FALSE
+
+// One-time application of skin across the entire chassis when the implant is inserted.
+/obj/item/organ/internal/cyberimp/chest/skinmonger/proc/apply_full_synthetic_skin(mob/living/carbon/human/target)
+	if(!ishuman(target))
+		return
+
+	var/mob/living/carbon/human/H = target
+	var/head_skinned = FALSE
+	for(var/obj/item/organ/external/E in H.bodyparts)
+		if(!E.is_robotic() || E.has_synthetic_skin)
+			continue
+
+		// Skip monitor heads
+		if(E.limb_name == "head" && E.model)
+			var/datum/robolimb/R = GLOB.all_robolimbs[E.model]
+			if(R && R.is_monitor)
+				continue
+
+		E.has_synthetic_skin = TRUE
+		// Apply owner's skin color to synthetic skin
+		E.synthetic_skin_colour = H.skin_colour
+		// Set configured identity for head
+		if(E.limb_name == "head")
+			E.synthetic_skin_identity = configured_identity
+			head_skinned = TRUE
+		// Clear sprite cache
+		E.force_icon = null
+		E.mob_icon = null
+		E.compile_icon()
+
+	// Apply facial identity if head was skinned
+	if(head_skinned)
+		H.real_name = configured_identity
+
+	H.update_body(rebuild_base = TRUE)
+
+/obj/item/organ/internal/cyberimp/chest/skinmonger/proc/remove_all_synthetic_skin(mob/living/carbon/human/target)
+	if(!ishuman(target))
+		return
+
+	var/mob/living/carbon/human/H = target
+	for(var/obj/item/organ/external/E in H.bodyparts)
+		if(E.is_robotic() && E.has_synthetic_skin)
+			E.remove_synthetic_skin(silent = TRUE) // silent because it spams the user otherwise
+
+	to_chat(H, SPAN_WARNING("You feel your synthetic skin melt away."))
+	H.update_body(rebuild_base = TRUE)
+
+// EMP wipes all synthetic skin and puts the implant on cooldown
+/obj/item/organ/internal/cyberimp/chest/skinmonger/emp_act(severity)
+	. = ..()
+
+	regenerating = FALSE
+	regeneration_active = FALSE
+	remove_all_synthetic_skin(owner)
+
+	addtimer(CALLBACK(src, PROC_REF(restart_regeneration)), regen_cooldown)
+
+/obj/item/organ/internal/cyberimp/chest/skinmonger/proc/restart_regeneration()
+	if(owner)
+		regeneration_active = TRUE
+		start_regeneration()
+
 //BOX O' IMPLANTS
 
 /obj/item/storage/box/cyber_implants

code/modules/surgery/organs/autosurgeon.dm

@@ -190,4 +190,44 @@
 /obj/item/autosurgeon/organ/syndicate/oneuse/syndie_mantis/l
 	starting_organ = /obj/item/organ/internal/cyberimp/arm/syndie_mantis/l
 
+/obj/item/autosurgeon/organ/syndicate/oneuse/skinmonger
+	starting_organ = /obj/item/organ/internal/cyberimp/chest/skinmonger
+
+/obj/item/autosurgeon/organ/syndicate/oneuse/skinmonger/attack_self__legacy__attackchain(mob/user)
+	if(!storedorgan)
+		return ..()
+
+	// Configure identity before implantation...
+	var/obj/item/organ/internal/cyberimp/chest/skinmonger/implant = storedorgan
+
+	// Check if they have a monitor head
+	var/has_monitor_head = FALSE
+	if(ishuman(user))
+		var/mob/living/carbon/human/H = user
+		var/obj/item/organ/external/head/head_organ = H.bodyparts_by_name["head"]
+		if(head_organ?.model)
+			var/datum/robolimb/R = GLOB.all_robolimbs[head_organ.model]
+			if(R?.is_monitor)
+				has_monitor_head = TRUE
+				to_chat(user, SPAN_WARNING("The Skinmonger is confused by your freakishly large head, but attempts to disguise you anyway."))
+
+	// Only ask for identity if they're a machine person and don't have a monitor head
+	if(ismachineperson(user) && !has_monitor_head)
+		if(!implant.configured_identity || implant.configured_identity == "Unknown")
+			var/chosen_name = tgui_input_text(user, "The Skinmonger generously offers to turn you into someone else. But who?", default = "Unknown", max_length = MAX_NAME_LEN)
+			if(!chosen_name)
+				return
+
+			// Allow to appear as "Unknown" (default value)
+			if(chosen_name != "Unknown")
+				chosen_name = reject_bad_name(chosen_name, max_length = MAX_NAME_LEN)
+				if(!chosen_name)
+					to_chat(user, SPAN_WARNING("The implanter quietly hisses, rejecting your choice."))
+					return
+
+			implant.configured_identity = chosen_name
+
+	// ... then implant
+	return ..()
+
 #undef INFINITE

code/modules/surgery/organs/organ_external.dm

@@ -64,6 +64,12 @@
 	var/fragile = FALSE
 	///The level of false skin used to cover robotic organs on the limb. Updated when too damaged, when installed, or when an organ with it is installed.
 	var/augmented_skin_cover_level = 0
+	/// Whether this robotic limb has synthetic skin applied
+	var/has_synthetic_skin = FALSE
+	/// Stored facial identity for synthetic skin (head only)
+	var/synthetic_skin_identity = null
+	/// Stored skin color for synthetic skin
+	var/synthetic_skin_colour = null
 
 // When the limb is not on a person, make sure it faces south so it's always visible.
 /obj/item/organ/external/setDir()
@@ -317,6 +323,10 @@
 				droplimb(1) //Clean loss, just drop the limb and be done
 
 	var/mob/living/carbon/owner_old = owner //Need to update health, but need a reference in case the below check cuts off a limb.
+
+	// Check if synthetic skin should be removed from damage
+	check_synthetic_skin_damage()
+
 	//If limb took enough damage, try to cut or tear it off
 	if(owner)
 		if(sharp && !(limb_flags & CANNOT_DISMEMBER))
@@ -578,7 +588,68 @@ Note that amputating the affected organ does in fact remove the infection from t
 	if((brute_dam >= max_damage * (augmented_skin_cover_level / 3) && brute) || (burn_dam >= max_damage * (augmented_skin_cover_level / 3) && burn)) // 66% for level 2, 100% for level 3
 		break_augmented_skin()
 
-// new damage icon system
+/obj/item/organ/external/proc/check_synthetic_skin_damage()
+	if(!has_synthetic_skin || !is_robotic())
+		return
+
+	var/damage_percentage = (brute_dam + burn_dam) / max_damage
+	if(damage_percentage >= 0.8)
+		remove_synthetic_skin()
+
+	// Upper body and lower body are tied together
+	check_connected_limb_skin_damage()
+
+// Chest and lower body are tied together with synthetic skin.
+/obj/item/organ/external/proc/check_connected_limb_skin_damage()
+	if(!owner || !has_synthetic_skin)
+		return
+
+	if(limb_name == "chest")
+		var/damage_percentage = (brute_dam + burn_dam) / max_damage
+		if(damage_percentage >= 0.8)
+			var/obj/item/organ/external/groin_limb = owner.bodyparts_by_name["groin"]
+			if(groin_limb?.has_synthetic_skin)
+				groin_limb.remove_synthetic_skin()
+
+	if(limb_name == "groin")
+		var/damage_percentage = (brute_dam + burn_dam) / max_damage
+		if(damage_percentage >= 0.8)
+			var/obj/item/organ/external/chest_limb = owner.bodyparts_by_name["chest"]
+			if(chest_limb?.has_synthetic_skin)
+				chest_limb.remove_synthetic_skin()
+
+/obj/item/organ/external/proc/remove_synthetic_skin(silent = FALSE)
+	if(!has_synthetic_skin)
+		return
+
+	has_synthetic_skin = FALSE
+
+	// Restore original identity if this is a head
+	if(limb_name == "head" && owner && ishuman(owner))
+		var/mob/living/carbon/human/H = owner
+		synthetic_skin_identity = null
+		H.real_name = H.dna.real_name
+
+	// Restore original robotic appearance
+	if(model)
+		var/datum/robolimb/R = GLOB.all_robolimbs[model]
+		if(R)
+			force_icon = R.icon
+
+	if(ishuman(owner))
+		var/mob/living/carbon/human/H = owner
+		if(!silent)
+			to_chat(H, SPAN_WARNING("The synthetic skin on your [name] is destroyed!"))
+		// Force the sprite to update
+		mob_icon = null
+		compile_icon()
+		H.update_body(rebuild_base = TRUE)
+		H.UpdateDamageIcon()
+
+		var/obj/item/organ/internal/cyberimp/chest/skinmonger/regen = H.get_int_organ(/obj/item/organ/internal/cyberimp/chest/skinmonger)
+		if(regen)
+			regen.start_regeneration()
+
 // returns just the brute/burn damage code
 /obj/item/organ/external/proc/damage_state_text()
 	var/tburn = 0
@@ -627,6 +698,14 @@ Note that amputating the affected organ does in fact remove the infection from t
 	if(limb_flags & CANNOT_DISMEMBER || !owner)
 		return
 
+	// Loose limbs should not have any synthetic skin
+	if(has_synthetic_skin)
+		remove_synthetic_skin()
+	if(children)
+		for(var/obj/item/organ/external/child in children)
+			if(child.has_synthetic_skin)
+				child.remove_synthetic_skin()
+
 	if(HAS_TRAIT(owner, TRAIT_I_WANT_BRAINS) && !clean)
 		fracture()
 		return

code/modules/surgery/organs/organ_icon.dm

@@ -23,6 +23,10 @@
 
 /obj/item/organ/external/proc/sync_colour_to_human(mob/living/carbon/human/H)
 	if(is_robotic() && !istype(dna.species, /datum/species/machine)) //machine people get skin color
+		// For robotic parts with synthetic skin, use stored synthetic skin color
+		if(has_synthetic_skin && synthetic_skin_colour)
+			s_col = synthetic_skin_colour
+			s_tone = null
 		return
 	if(dna.species && H.dna.species && dna.species.name != H.dna.species.name)
 		return
@@ -67,7 +71,7 @@
 		var/icon_file = new_icons[1]
 		var/new_icon_state = new_icons[2]
 		mob_icon = new /icon(icon_file, new_icon_state)
-		if(!skeletal && !is_robotic())
+		if(!skeletal && (!is_robotic() || (is_robotic() && has_synthetic_skin)))
 			if(status & ORGAN_DEAD)
 				mob_icon.ColorTone(COLORTONE_DEAD_EXT_ORGAN)
 				mob_icon.SetIntensity(0.7)
@@ -169,8 +173,10 @@
 
 		if(skeletal)
 			icon_file = 'icons/mob/human_races/r_skeleton.dmi'
-		else if(is_robotic())
+		else if(is_robotic() && !has_synthetic_skin)
 			icon_file = 'icons/mob/human_races/robotic.dmi'
+		else if(has_synthetic_skin && dna.species && istype(dna.species, /datum/species/machine))
+			icon_file = 'icons/mob/human_races/r_human.dmi'
 		else
 			// Congratulations, you are normal
 			icon_file = icobase