Stethoscope fixes and additions (#5015)

* Stethoscope fixes and additions

Now with less ❄️. At least, the species ❄️ kind.

- Stethoscopes now check for a heart and lungs. If the target doesn't
have either, the user won't hear anything. Sure, this means the user
will still hear a pulse if the target just has lungs and vice versa, but
you'll probably be dead or have microbattery or something if you don't
have both.
- Using the stethoscope on yourself will display a message that uses
'your' instead of 'his' or 'her'.
- Using a stethoscope on someone will tell the user if the target is
having a heart attack ("hear an irregular pulse and respiration")
- The messages displayed will properly use 'the'. ("[user] places the
stethoscope" instead of "[user] places stethoscope")

I don't know why I'm bothering with this, no one uses stethoscopes for a
good reason.

* (Hopefully) fixes the same message for lungs but no heart. Also reduces the oxyloss threshold thing. I probably did this very wrong.

* Tully got salty because I stole his PR, so we collaborated

* Rewrites the code to be less shit, probably

code/modules/clothing/under/accessories/accessory.dm

@@ -103,35 +103,45 @@
 
 /obj/item/clothing/accessory/stethoscope/attack(mob/living/carbon/human/M, mob/living/user)
 	if(ishuman(M) && isliving(user))
-		if(user.a_intent == I_HELP)
-			var/body_part = parse_zone(user.zone_sel.selecting)
-			if(body_part)
-				var/their = "their"
-				switch(M.gender)
-					if(MALE)	their = "his"
-					if(FEMALE)	their = "her"
-
-				var/sound = "pulse"
-				var/sound_strength
-
-				if(M.stat == DEAD || (M.status_flags&FAKEDEATH))
-					sound_strength = "cannot hear"
-					sound = "anything"
-				else
-					sound_strength = "hear a weak"
-					switch(body_part)
-						if("chest")
-							if(M.oxyloss < 50)
-								sound_strength = "hear a healthy"
-							sound = "pulse and respiration"
-						if("eyes","mouth")
-							sound_strength = "cannot hear"
-							sound = "anything"
-						else
-							sound_strength = "hear a weak"
-
-				user.visible_message("[user] places [src] against [M]'s [body_part] and listens attentively.", "You place [src] against [their] [body_part]. You [sound_strength] [sound].")
-				return
+		if(user == M)
+			user.visible_message("[user] places \the [src] against \his chest and listens attentively.", "You place \the [src] against your chest...")
+		else
+			user.visible_message("[user] places \the [src] against [M]'s chest and listens attentively.", "You place \the [src] against [M]'s chest...")
+		var/obj/item/organ/internal/H = M.get_int_organ(/obj/item/organ/internal/heart)
+		var/obj/item/organ/internal/L = M.get_int_organ(/obj/item/organ/internal/lungs)
+		if((H && M.pulse) || (L && !(NO_BREATH in M.mutations) && !(M.species.flags & NO_BREATH)))
+			var/color = "notice"
+			if(H)
+				var/heart_sound
+				switch(H.damage)
+					if(0 to 1)
+						heart_sound = "healthy"
+					if(1 to 25)
+						heart_sound = "offbeat"
+					if(25 to 50)
+						heart_sound = "uneven"
+						color = "warning"
+					if(50 to INFINITY)
+						heart_sound = "weak, unhealthy"
+						color = "warning"
+				to_chat(user, "<span class='[color]'>You hear \an [heart_sound] pulse.</span>")
+			if(L)
+				var/lung_sound
+				switch(L.damage)
+					if(0 to 1)
+						lung_sound = "healthy respiration"
+					if(1 to 25)
+						lung_sound = "labored respiration"
+					if(25 to 50)
+						lung_sound = "pained respiration"
+						color = "warning"
+					if(50 to INFINITY)
+						lung_sound = "gurgling"
+						color = "warning"
+				to_chat(user, "<span class='[color]'>You hear [lung_sound].</span>")
+		else
+			to_chat(user, "<span class='warning'>You don't hear anything.</span>")
+		return
 	return ..(M,user)