Kidney overhaul (#31324)

* The Kidneying

* Oculine

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

@@ -13,6 +13,7 @@
 	voice = GetVoice()
 
 	if(.) //not dead
+		handle_kidneys()
 
 		if(check_mutations)
 			domutcheck(src)
@@ -981,6 +982,31 @@
 	AdjustLoseBreath(40 SECONDS, bound_lower = 0, bound_upper = 50 SECONDS)
 	adjustOxyLoss(20)
 
-// Need this in species.
-//#undef HUMAN_MAX_OXYLOSS
-//#undef HUMAN_CRIT_MAX_OXYLOSS
+/mob/living/carbon/human/proc/handle_kidneys()
+	var/obj/item/organ/kidneys = get_int_organ(/obj/item/organ/internal/kidneys)
+	if(isslimeperson(src))
+		kidneys = get_int_organ(/obj/item/organ/internal/brain)
+
+	var/damage_percentage = 0
+	if(kidneys && !(kidneys.status & ORGAN_DEAD)) // No kidneys = full damage
+		damage_percentage = ((kidneys.max_damage - kidneys.damage) / kidneys.max_damage) * 100
+		if(damage_percentage >= 75) // Above 75% HP, no damage
+			return
+
+	var/total_damage = 0
+	for(var/datum/reagent/chem as anything in reagents.reagent_list)
+		total_damage += chem.max_kidney_damage
+
+	if(!total_damage)
+		return // No damage
+
+	switch(damage_percentage)
+		// No 0 since that's full damage
+		if(1 to 25)
+			total_damage *= 0.5
+		if(25 to 50)
+			total_damage *= 0.2
+		if(50 to 75)
+			total_damage *= 0.05
+
+	adjustToxLoss(total_damage)

code/modules/reagents/chemistry/reagents/drinks_reagents.dm

@@ -1076,6 +1076,7 @@
 	taste_description = "salt"
 	adj_dizzy = -5 SECONDS
 	process_flags = ORGANIC | SYNTHETIC
+	max_kidney_damage = 3
 
 /datum/reagent/consumable/drink/electrolytes/on_mob_life(mob/living/M)
 	M.AdjustConfused(-5 SECONDS)

code/modules/reagents/chemistry/reagents/medicine.dm

@@ -144,6 +144,7 @@
 	color = "#8523be"
 	taste_description = "nurturing"
 	goal_difficulty = REAGENT_GOAL_NORMAL
+	max_kidney_damage = 0
 
 /datum/reagent/medicine/mitocholide/on_mob_life(mob/living/M)
 	if(ishuman(M))
@@ -449,6 +450,7 @@
 	reagent_state = LIQUID
 	taste_description = "dust"
 	goal_difficulty = REAGENT_GOAL_EASY
+	max_kidney_damage = 0
 
 /datum/reagent/medicine/charcoal/on_mob_life(mob/living/M)
 	var/update_flags = STATUS_UPDATE_NONE
@@ -472,6 +474,7 @@
 	addiction_threshold = 5
 	harmless = FALSE
 	taste_description = "health"
+	max_kidney_damage = 0
 
 /datum/reagent/medicine/omnizine/on_mob_life(mob/living/carbon/human/H)
 	var/update_flags = STATUS_UPDATE_NONE
@@ -641,6 +644,7 @@
 	metabolization_rate = 0.2
 	taste_description = "safety"
 	goal_difficulty = REAGENT_GOAL_NORMAL
+	max_kidney_damage = 0
 
 /datum/reagent/medicine/salbutamol/on_mob_life(mob/living/M)
 	var/update_flags = STATUS_UPDATE_NONE
@@ -663,6 +667,7 @@
 	harmless = FALSE
 	taste_description = "oxygenation"
 	goal_difficulty = REAGENT_GOAL_NORMAL
+	max_kidney_damage = 0
 
 /datum/reagent/medicine/perfluorodecalin/on_mob_life(mob/living/carbon/human/M)
 	var/update_flags = STATUS_UPDATE_NONE
@@ -833,6 +838,7 @@
 	color = "#757377"
 	taste_description = "clarity"
 	goal_difficulty = REAGENT_GOAL_HARD
+	max_kidney_damage = 0
 
 /datum/reagent/medicine/oculine/on_mob_life(mob/living/M)
 	var/update_flags = STATUS_UPDATE_NONE
@@ -1013,6 +1019,7 @@
 	harmless = FALSE
 	overdose_threshold = 15
 	goal_difficulty = REAGENT_GOAL_HARD
+	max_kidney_damage = 4
 
 /datum/reagent/medicine/sanguine_reagent/on_mob_life(mob/living/M)
 	if(!ishuman(M))
@@ -1069,6 +1076,7 @@
 	harmless = FALSE
 	overdose_threshold = 30 //so a single shotgun dart can't cause the tumor effect
 	goal_difficulty = REAGENT_GOAL_HARD
+	max_kidney_damage = 4 // So much calcium
 
 /datum/reagent/medicine/osseous_reagent/on_mob_life(mob/living/M)
 	var/update_flags = STATUS_UPDATE_NONE
@@ -1096,6 +1104,7 @@
 	color = "#D1D1F1"
 	taste_description = "sweetness"
 	goal_difficulty = REAGENT_GOAL_EASY
+	max_kidney_damage = 0
 
 /datum/reagent/medicine/mannitol/on_mob_life(mob/living/M)
 	var/update_flags = STATUS_UPDATE_NONE

code/modules/reagents/chemistry/reagents_datum.dm

@@ -55,6 +55,9 @@
 	/// If we burn in a fire, what color do we have?
 	var/burn_color
 
+	/// How much damage can this reagent do when you have no kidneys?
+	var/max_kidney_damage = 2
+
 /datum/reagent/Destroy()
 	. = ..()
 	holder = null

code/modules/surgery/organs/kidneys.dm

@@ -6,17 +6,6 @@
 	parent_organ = "groin"
 	slot = "kidneys"
 
-/obj/item/organ/internal/kidneys/on_life()
-	// Coffee is really bad for you with busted kidneys.
-	// This should probably be expanded in some way, but fucked if I know
-	// what else kidneys can process in our reagent list.
-	var/datum/reagent/coffee = locate(/datum/reagent/consumable/drink/coffee) in owner.reagents.reagent_list
-	if(coffee)
-		if(is_bruised())
-			owner.adjustToxLoss(0.1 * PROCESS_ACCURACY)
-		else if(is_broken())
-			owner.adjustToxLoss(0.3 * PROCESS_ACCURACY)
-
 /obj/item/organ/internal/kidneys/cybernetic
 	name = "cybernetic kidneys"
 	icon_state = "kidneys-c"