Surgery Modifications

Semi-rewrites how surgery failure works.  Using an improper surface will call the surgery step's fail proc instead of just doing a melee attack.
Adds 'surgery odds' var to objs, which determines effectiveness.  The numbers for operating tables/roller beds/tables remain unchanged from the previous version, however doing it this way makes it cleaner to add new surfaces in the future.
Adds a proc to get a surgery surface.
Also makes burn repair on FBPs more efficent, so that one scorched robot does not take literally all of robotic's wires.

code/_helpers/unsorted.dm

@@ -1157,12 +1157,22 @@ proc/is_hot(obj/item/W as obj)
 	istype(W, /obj/item/weapon/surgical/bonesetter)
 	)
 
-//check if mob is lying down on something we can operate him on.
+// check if mob is lying down on something we can operate him on.
+// The RNG with table/rollerbeds comes into play in do_surgery() so that fail_step() can be used instead.
 /proc/can_operate(mob/living/carbon/M)
-	return (M.lying && \
-	locate(/obj/machinery/optable, M.loc) || \
-	(locate(/obj/structure/bed/roller, M.loc) && prob(75)) || \
-	(locate(/obj/structure/table/, M.loc) && prob(66)))
+	return M.lying
+
+// Returns an instance of a valid surgery surface.
+/mob/living/proc/get_surgery_surface()
+	if(!lying)
+		return null // Not lying down means no surface.
+	var/obj/surface = null
+	for(var/obj/O in loc) // Looks for the best surface.
+		if(O.surgery_odds)
+			if(!surface || surface.surgery_odds < O)
+				surface = O
+	if(surface)
+		return surface
 
 /proc/reverse_direction(var/dir)
 	switch(dir)

code/game/machinery/OpTable.dm

@@ -8,6 +8,7 @@
 	use_power = 1
 	idle_power_usage = 1
 	active_power_usage = 5
+	surgery_odds = 100
 	var/mob/living/carbon/human/victim = null
 	var/strapped = 0.0
 	var/obj/machinery/computer/operating/computer = null

code/game/objects/structures/stool_bed_chair_nest/bed.dm

@@ -203,6 +203,7 @@
 	icon = 'icons/obj/rollerbed.dmi'
 	icon_state = "down"
 	anchored = 0
+	surgery_odds = 75
 
 /obj/structure/bed/roller/update_icon()
 	return // Doesn't care about material or anything else.

code/modules/power/cable.dm

@@ -526,9 +526,9 @@ obj/structure/cable/proc/cableColor(var/colorC)
 		if(!S || S.robotic < ORGAN_ROBOT || S.open == 3)
 			return ..()
 
-		var/use_amt = min(src.amount, ceil(S.burn_dam/3), 5)
+		var/use_amt = min(src.amount, ceil(S.burn_dam/5), 5)
 		if(can_use(use_amt))
-			if(S.robo_repair(3*use_amt, BURN, "some damaged wiring", src, user))
+			if(S.robo_repair(5*use_amt, BURN, "some damaged wiring", src, user))
 				src.use(use_amt)
 
 	else

code/modules/surgery/surgery.dm

@@ -1,5 +1,8 @@
 /* SURGERY STEPS */
 
+/obj/
+	var/surgery_odds = 0 // Used for tables/etc which can have surgery done of them.
+
 /datum/surgery_step
 	var/priority = 0	//steps with higher priority would be attempted first
 
@@ -111,13 +114,29 @@
 					return 1
 				M.op_stage.in_progress += zone
 				S.begin_step(user, M, zone, src)		//start on it
-				//We had proper tools! (or RNG smiled.) and user did not move or change hands.
-				if(prob(S.tool_quality(src)) &&  do_mob(user, M, rand(S.min_duration, S.max_duration)))
-					S.end_step(user, M, zone, src)		//finish successfully
-				else if ((src in user.contents) && user.Adjacent(M))			//or
-					S.fail_step(user, M, zone, src)		//malpractice~
-				else // This failing silently was a pain.
-					user << "<span class='warning'>You must remain close to your patient to conduct surgery.</span>"
+				var/success = TRUE
+
+				// Bad tools make it less likely to succeed.
+				if(!prob(S.tool_quality(src)))
+					success = FALSE
+
+				// Bad or no surface may mean failure as well.
+				var/obj/surface = M.get_surgery_surface()
+				if(!surface || !prob(surface.surgery_odds))
+					success = FALSE
+
+				// Not staying still fails you too.
+				if(success)
+					if(!do_mob(user, M, rand(S.min_duration, S.max_duration)))
+						success = FALSE
+					else
+						to_chat(user, "<span class='warning'>You must remain close to your patient to conduct surgery.</span>")
+
+				if(success)
+					S.end_step(user, M, zone, src)
+				else
+					S.fail_step(user, M, zone, src)
+
 				M.op_stage.in_progress -= zone 									// Clear the in-progress flag.
 				if (ishuman(M))
 					var/mob/living/carbon/human/H = M

code/modules/tables/tables.dm

@@ -8,6 +8,7 @@
 	climbable = 1
 	layer = 2.8
 	throwpass = 1
+	surgery_odds = 66
 	var/flipped = 0
 	var/maxhealth = 10
 	var/health = 10