Allows clings to regenerate without a brain. (#19856)

* Move brain organ code where it belongs

* Rename too

* WIP, but hey, it kinda works now.

* Account for a few missing heads

* Remove vital check, killing the user on death

* Let defibs and scanners better deal with these

* Remove debug brains

* Clean up some more contingencies

* More head checks

* Update code/modules/antagonists/changeling/datum_changeling.dm

Co-authored-by: Farie82 <farie82@users.noreply.github.com>

* Fixes up signal business

* some stuff from sean's review

* Add some type safety checks for heads

* oops

* Update code/game/objects/items/weapons/cosmetics.dm

get this in there too

Co-authored-by: S34N <12197162+S34NW@users.noreply.github.com>

* Remove decap sword

* Quick suggestions

Co-authored-by: Ryan <80364400+Sirryan2002@users.noreply.github.com>

* Addresses shedding problems

* Add new defib changes

* this is why we have CI

Co-authored-by: Farie82 <farie82@users.noreply.github.com>
Co-authored-by: S34N <12197162+S34NW@users.noreply.github.com>
Co-authored-by: Ryan <80364400+Sirryan2002@users.noreply.github.com>

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

@@ -1,137 +0,0 @@
-/obj/item/organ/internal/brain
-	name = "brain"
-	max_damage = 120
-	icon_state = "brain2"
-	force = 1.0
-	w_class = WEIGHT_CLASS_SMALL
-	throwforce = 1.0
-	throw_speed = 3
-	throw_range = 5
-	origin_tech = "biotech=5"
-	attack_verb = list("attacked", "slapped", "whacked")
-	var/mob/living/carbon/brain/brainmob = null
-	organ_tag = "brain"
-	parent_organ = "head"
-	slot = "brain"
-	vital = TRUE
-	hidden_pain = TRUE //the brain has no pain receptors, and brain damage is meant to be a stealthy damage type.
-	var/mmi_icon = 'icons/obj/assemblies.dmi'
-	var/mmi_icon_state = "mmi_full"
-
-/obj/item/organ/internal/brain/xeno
-	name = "xenomorph brain"
-	desc = "We barely understand the brains of terrestial animals. Who knows what we may find in the brain of such an advanced species?"
-	icon_state = "brain-x"
-	origin_tech = "biotech=6"
-	mmi_icon = 'icons/mob/alien.dmi'
-	mmi_icon_state = "AlienMMI"
-
-/obj/item/organ/internal/brain/Destroy()
-	QDEL_NULL(brainmob)
-	return ..()
-
-/obj/item/organ/internal/brain/proc/transfer_identity(mob/living/carbon/H)
-	brainmob = new(src)
-	if(isnull(dna)) // someone didn't set this right...
-		stack_trace("[src] at [loc] did not contain a dna datum at time of removal.")
-		dna = H.dna.Clone()
-	name = "\the [dna.real_name]'s [initial(src.name)]"
-	brainmob.dna = dna.Clone() // Silly baycode, what you do
-//	brainmob.dna = H.dna.Clone() Putting in and taking out a brain doesn't make it a carbon copy of the original brain of the body you put it in
-	brainmob.name = dna.real_name
-	brainmob.real_name = dna.real_name
-	brainmob.timeofhostdeath = H.timeofdeath
-	if(H.mind)
-		H.mind.transfer_to(brainmob)
-
-	to_chat(brainmob, "<span class='notice'>You feel slightly disoriented. That's normal when you're just a [initial(src.name)].</span>")
-
-/obj/item/organ/internal/brain/examine(mob/user) // -- TLE
-	. = ..()
-	if(brainmob && brainmob.client)//if thar be a brain inside... the brain.
-		. += "You can feel the small spark of life still left in this one."
-	else
-		. += "This one seems particularly lifeless. Perhaps it will regain some of its luster later.."
-
-/obj/item/organ/internal/brain/remove(mob/living/user,special = 0)
-	if(dna)
-		name = "[dna.real_name]'s [initial(name)]"
-
-	if(!owner) return ..() // Probably a redundant removal; just bail
-
-	var/obj/item/organ/internal/brain/B = src
-	if(!special)
-		if(owner.mind && !non_primary)//don't transfer if the owner does not have a mind.
-			B.transfer_identity(user)
-
-	if(ishuman(owner))
-		var/mob/living/carbon/human/H = owner
-		H.update_hair()
-	
-	owner.thought_bubble_image = initial(owner.thought_bubble_image)
-	. = ..()
-
-/obj/item/organ/internal/brain/insert(mob/living/target,special = 0)
-
-	name = "[initial(name)]"
-	var/brain_already_exists = 0
-	if(ishuman(target)) // No more IPC multibrain shenanigans
-		if(target.get_int_organ(/obj/item/organ/internal/brain))
-			brain_already_exists = 1
-
-		var/mob/living/carbon/human/H = target
-		H.update_hair()
-
-	if(!brain_already_exists)
-		if(brainmob)
-			if(target.key)
-				target.ghostize()
-			if(brainmob.mind)
-				brainmob.mind.transfer_to(target)
-			else
-				target.key = brainmob.key
-	else
-		log_debug("Multibrain shenanigans at ([target.x],[target.y],[target.z]), mob '[target]'")
-	..(target, special = special)
-
-/obj/item/organ/internal/brain/receive_damage(amount, silent = 0) //brains are special; if they receive damage by other means, we really just want the damage to be passed ot the owner and back onto the brain.
-	if(owner)
-		owner.adjustBrainLoss(amount)
-
-/obj/item/organ/internal/brain/necrotize(update_sprite = TRUE) //Brain also has special handling for when it necrotizes
-	damage = max_damage
-	status |= ORGAN_DEAD
-	STOP_PROCESSING(SSobj, src)
-	if(dead_icon && !is_robotic())
-		icon_state = dead_icon
-	if(owner && vital)
-		owner.setBrainLoss(120)
-
-/obj/item/organ/internal/brain/prepare_eat()
-	return // Too important to eat.
-
-/obj/item/organ/internal/brain/slime
-	name = "slime core"
-	desc = "A complex, organic knot of jelly and crystalline particles."
-	icon = 'icons/mob/slimes.dmi'
-	icon_state = "green slime extract"
-	mmi_icon_state = "slime_mmi"
-//	parent_organ = "chest" Hello I am from the ministry of rubber forehead aliens how are you
-
-/obj/item/organ/internal/brain/golem
-	name = "Runic mind"
-	desc = "A tightly furled roll of paper, covered with indecipherable runes."
-	icon = 'icons/obj/wizard.dmi'
-	icon_state = "scroll"
-
-/obj/item/organ/internal/brain/Destroy() //copypasted from MMIs.
-	QDEL_NULL(brainmob)
-	return ..()
-
-/obj/item/organ/internal/brain/cluwne
-
-/obj/item/organ/internal/brain/cluwne/insert(mob/living/target, special = 0, make_cluwne = 1)
-	..(target, special = special)
-	if(ishuman(target) && make_cluwne)
-		var/mob/living/carbon/human/H = target
-		H.makeCluwne() //No matter where you go, no matter what you do, you cannot escape

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

@@ -10,13 +10,14 @@
 
 	gender = new_gender
 
-	var/datum/sprite_accessory/hair/current_hair = GLOB.hair_styles_full_list[H.h_style]
-	if(current_hair.gender != NEUTER && current_hair.gender != gender)
-		reset_head_hair()
+	if(istype(H))
+		var/datum/sprite_accessory/hair/current_hair = GLOB.hair_styles_full_list[H.h_style]
+		if(current_hair.gender != NEUTER && current_hair.gender != gender)
+			reset_head_hair()
 
-	var/datum/sprite_accessory/hair/current_fhair = GLOB.facial_hair_styles_list[H.f_style]
-	if(current_fhair.gender != NEUTER && current_fhair.gender != gender)
-		reset_facial_hair()
+		var/datum/sprite_accessory/hair/current_fhair = GLOB.facial_hair_styles_list[H.f_style]
+		if(current_fhair.gender != NEUTER && current_fhair.gender != gender)
+			reset_facial_hair()
 
 	if(update_dna)
 		update_dna()

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

@@ -361,10 +361,9 @@
 		msg += "<span class = 'deptradio'>Medical records:</span> <a href='?src=[UID()];medrecord=`'>\[View\]</a> <a href='?src=[UID()];medrecordadd=`'>\[Add comment\]</a>\n"
 
 	if(print_flavor_text() && !skipface)
-		if(get_organ("head"))
-			var/obj/item/organ/external/head/H = get_organ("head")
-			if(!(H.status & ORGAN_DISFIGURED))
-				msg += "[print_flavor_text()]\n"
+		var/obj/item/organ/external/head/H = get_organ("head")
+		if(H && !(H.status & ORGAN_DISFIGURED))
+			msg += "[print_flavor_text()]\n"
 
 	msg += "*---------*</span>"
 	if(pose)

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

@@ -1393,32 +1393,33 @@
 
 	//Handle default hair/head accessories for created mobs.
 	var/obj/item/organ/external/head/H = get_organ("head")
-	if(dna.species.default_hair)
-		H.h_style = dna.species.default_hair
-	else
-		H.h_style = "Bald"
-	if(dna.species.default_fhair)
-		H.f_style = dna.species.default_fhair
-	else
-		H.f_style = "Shaved"
-	if(dna.species.default_headacc)
-		H.ha_style = dna.species.default_headacc
-	else
-		H.ha_style = "None"
+	if(istype(H))
+		if(dna.species.default_hair)
+			H.h_style = dna.species.default_hair
+		else
+			H.h_style = "Bald"
+		if(dna.species.default_fhair)
+			H.f_style = dna.species.default_fhair
+		else
+			H.f_style = "Shaved"
+		if(dna.species.default_headacc)
+			H.ha_style = dna.species.default_headacc
+		else
+			H.ha_style = "None"
 
-	if(dna.species.default_hair_colour)
-		//Apply colour.
-		H.hair_colour = dna.species.default_hair_colour
-	else
-		H.hair_colour = "#000000"
-	if(dna.species.default_fhair_colour)
-		H.facial_colour = dna.species.default_fhair_colour
-	else
-		H.facial_colour = "#000000"
-	if(dna.species.default_headacc_colour)
-		H.headacc_colour = dna.species.default_headacc_colour
-	else
-		H.headacc_colour = "#000000"
+		if(dna.species.default_hair_colour)
+			//Apply colour.
+			H.hair_colour = dna.species.default_hair_colour
+		else
+			H.hair_colour = "#000000"
+		if(dna.species.default_fhair_colour)
+			H.facial_colour = dna.species.default_fhair_colour
+		else
+			H.facial_colour = "#000000"
+		if(dna.species.default_headacc_colour)
+			H.headacc_colour = dna.species.default_headacc_colour
+		else
+			H.headacc_colour = "#000000"
 
 	m_styles = DEFAULT_MARKING_STYLES //Wipes out markings, setting them all to "None".
 	m_colours = DEFAULT_MARKING_COLOURS //Defaults colour to #00000 for all markings.
@@ -1525,6 +1526,8 @@
 
 /mob/living/carbon/human/proc/get_eye_shine() //Referenced cult constructs for shining in the dark. Needs to be above lighting effects such as shading.
 	var/obj/item/organ/external/head/head_organ = get_organ("head")
+	if(!istype(head_organ))
+		return
 	var/datum/sprite_accessory/hair/hair_style = GLOB.hair_styles_full_list[head_organ.h_style]
 	var/icon/hair = new /icon("icon" = hair_style.icon, "icon_state" = "[hair_style.icon_state]_s")
 	var/mutable_appearance/MA = mutable_appearance(get_icon_difference(get_eyecon(), hair), layer = ABOVE_LIGHTING_LAYER)

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

@@ -64,6 +64,10 @@
 		if(sponge)
 			return min(sponge.damage,maxHealth*2)
 		else
+			if(ischangeling(src))
+				// if a changeling has no brain, they have no brain damage.
+				return 0
+
 			return 200
 	else
 		return 0

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

@@ -847,7 +847,7 @@
 
 	if(radiation > RAD_MOB_HAIRLOSS)
 		var/obj/item/organ/external/head/head_organ = H.get_organ("head")
-		if(!head_organ || (NO_HAIR in species_traits))
+		if(!istype(head_organ) || (NO_HAIR in species_traits))
 			return
 		if(prob(15) && head_organ.h_style != "Bald")
 			to_chat(H, "<span class='danger'>Your hair starts to fall out in clumps...</span>")
@@ -1019,4 +1019,4 @@ It'll return null if the organ doesn't correspond, so include null checks when u
 		return H.skin_colour
 	else
 		var/obj/item/organ/external/head/HD = H.get_organ("head")
-		return HD.hair_colour
+		return HD?.hair_colour

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

@@ -103,7 +103,7 @@
 
 /datum/species/machine/handle_death(gibbed, mob/living/carbon/human/H)
 	var/obj/item/organ/external/head/head_organ = H.get_organ("head")
-	if(!head_organ)
+	if(!istype(head_organ))
 		return
 	head_organ.h_style = "Bald"
 	head_organ.f_style = "Shaved"

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

@@ -306,7 +306,7 @@ GLOBAL_LIST_EMPTY(damage_icon_parts)
 			markings_standing.Blend(b_marking_s, ICON_OVERLAY)
 	//Head markings.
 	var/obj/item/organ/external/head/head_organ = get_organ("head")
-	if(head_organ && m_styles["head"]) //If the head is destroyed, forget the head markings. This prevents floating optical markings on decapitated IPCs, for example.
+	if(istype(head_organ) && m_styles["head"]) //If the head is destroyed, forget the head markings. This prevents floating optical markings on decapitated IPCs, for example.
 		var/head_marking = m_styles["head"]
 		var/datum/sprite_accessory/head_marking_style = GLOB.marking_styles_list[head_marking]
 		if(head_marking_style && head_marking_style.species_allowed && (head_organ.dna.species.name in head_marking_style.species_allowed))
@@ -325,7 +325,7 @@ GLOBAL_LIST_EMPTY(damage_icon_parts)
 	remove_overlay(HEAD_ACC_OVER_LAYER)
 
 	var/obj/item/organ/external/head/head_organ = get_organ("head")
-	if(!head_organ)
+	if(!istype(head_organ))
 		return
 
 	//masks and helmets can obscure our head accessory
@@ -360,7 +360,7 @@ GLOBAL_LIST_EMPTY(damage_icon_parts)
 	remove_overlay(HAIR_LAYER)
 
 	var/obj/item/organ/external/head/O = get_organ("head")
-	if(!O)
+	if(!istype(O))
 		return
 
 	if((head?.flags & BLOCKHAIR) || (wear_mask?.flags & BLOCKHAIR))
@@ -445,7 +445,7 @@ GLOBAL_LIST_EMPTY(damage_icon_parts)
 	remove_overlay(FHAIR_OVER_LAYER)
 
 	var/obj/item/organ/external/head/head_organ = get_organ("head")
-	if(!head_organ)
+	if(!istype(head_organ))
 		return
 
 	//masks and helmets can obscure our facial hair, unless we're a synthetic
@@ -987,7 +987,7 @@ GLOBAL_LIST_EMPTY(damage_icon_parts)
 	if(wear_mask && (istype(wear_mask, /obj/item/clothing/mask) || istype(wear_mask, /obj/item/clothing/accessory)))
 		if(!(slot_wear_mask in check_obscured_slots()))
 			var/obj/item/organ/external/head/head_organ = get_organ("head")
-			if(!head_organ)
+			if(!istype(head_organ))
 				return // Nothing to update here
 			var/datum/sprite_accessory/alt_heads/alternate_head
 			if(head_organ.alt_head && head_organ.alt_head != "None")

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

@@ -220,7 +220,7 @@
 	SSticker.mode.greyshirts += target.mind
 	target.set_species(/datum/species/human)
 	var/obj/item/organ/external/head/head_organ = target.get_organ("head")
-	if(head_organ)
+	if(istype(head_organ))
 		head_organ.h_style = "Bald"
 		head_organ.f_style = "Shaved"
 	target.s_tone = 35