Added internal organs.

They can be hurt by their parent organ getting hurt.

Ruptured lungs are now represented as damage to the lungs internal organ.

code/datums/organs/organ_external.dm

@@ -25,6 +25,9 @@
 	var/datum/organ/external/parent
 	var/list/datum/organ/external/children
 
+	// Internal organs of this body part
+	var/list/datum/organ/internal/internal_organs
+
 	var/damage_msg = "\red You feel an intense pain"
 	var/broken_description
 
@@ -93,6 +96,13 @@
 			droplimb(1)
 			return
 
+	// High brute damage or sharp objects may damage internal organs
+	if(internal_organs != null) if( (sharp && brute >= 5) || brute >= 10) if(prob(5))
+		// Damage an internal organ
+		var/datum/organ/internal/I = pick(internal_organs)
+		I.take_damage(brute / 2)
+		brute -= brute / 2
+
 	if(status & ORGAN_BROKEN && prob(40) && brute)
 		owner.emote("scream")	//getting hit on broken hand hurts
 	if(used_weapon)
@@ -555,7 +565,6 @@
 	max_damage = 150
 	min_broken_damage = 75
 	body_part = UPPER_TORSO
-	var/ruptured_lungs = 0
 
 /datum/organ/external/groin
 	name = "groin"

code/datums/organs/organ_internal.dm

@@ -1,6 +1,8 @@
 /****************************************************
 				INTERNAL ORGANS
 ****************************************************/
+
+/*
 /datum/organ/internal
 	name = "internal"
 	var/damage = 0
@@ -62,3 +64,53 @@
 	var/lungs = null
 	var/stomach = null
 
+*/
+
+/mob/living/carbon/human/var/list/internal_organs = list()
+
+/datum/organ/internal
+	// amount of damage to the organ
+	var/damage = 0
+	var/min_bruised_damage = 10
+	var/min_broken_damage = 30
+	var/parent_organ = "chest"
+
+/datum/organ/internal/proc/is_bruised()
+	return damage >= min_bruised_damage
+
+/datum/organ/internal/proc/is_broken()
+	return damage >= min_broken_damage
+
+
+/datum/organ/internal/New(mob/living/carbon/human/H)
+	..()
+	var/datum/organ/external/E = H.organs_by_name[src.parent_organ]
+	if(E.internal_organs == null)
+		E.internal_organs = list()
+	E.internal_organs += src
+	H.internal_organs[src.name] = src
+	src.owner = H
+
+/datum/organ/internal/proc/take_damage(amount)
+	src.damage += amount
+
+	var/datum/organ/external/parent = owner.get_organ(parent_organ)
+	owner.custom_pain("Something inside your [parent.display_name] hurts a lot.", 1)
+
+/datum/organ/internal/heart
+	name = "heart"
+	parent_organ = "chest"
+
+
+/datum/organ/internal/lungs
+	name = "lungs"
+	parent_organ = "chest"
+
+/datum/organ/internal/liver
+	name = "liver"
+	parent_organ = "chest"
+
+
+/datum/organ/internal/kidney
+	name = "kidney"
+	parent_organ = "chest"

code/datums/organs/pain.dm

@@ -81,3 +81,10 @@ mob/living/carbon/human/proc/handle_pain()
 			maxdam = dam
 	if(damaged_organ)
 		pain(damaged_organ.display_name, maxdam, 0)
+
+	// Damage to internal organs hurts a lot.
+	for(var/organ_name in internal_organs)
+		var/datum/organ/internal/I = internal_organs[organ_name]
+		if(I.damage > 2) if(prob(2))
+			var/datum/organ/external/parent = get_organ(I.parent_organ)
+			src.custom_pain("You feel a sharp pain in your [parent.display_name]", 1)