Lets lockers/crates protect food from ants (#23286)

* Let lockers prevent ants

* Refactor ants check; exclude closed lockers and cardboard boxes from turf structure check

* Make the structure check more lenient, convert to typecache

* gnarg

* gnarg 2: Electric Boogaloo

* Minor simplification/optimization

code/modules/food_and_drinks/food_base.dm

@@ -4,17 +4,22 @@
 /obj/item/reagent_containers/food
 	possible_transfer_amounts = null
 	visible_transfer_rate = FALSE
-	volume = 50 //Sets the default container amount for all food items.
-	var/filling_color = "#FFFFFF" //Used by sandwiches.
-	var/junkiness = 0  //for junk food. used to lower human satiety.
+	volume = 50
+	/// Used by sandwiches
+	var/filling_color = "#FFFFFF"
+	/// Used by junk food to lower satiety
+	var/junkiness = 0
 	var/bitesize = 2
 	var/consume_sound = 'sound/items/eatfood.ogg'
-	var/antable = TRUE // Will ants come near it?
-	/// location checked every 5 minutes. If its the same place, the food has a chance to spawn ants
+	/// Will ants infest it?
+	var/antable = TRUE
+	/// Location checked every 5 minutes. If its the same place, the food has a chance to spawn ants
 	var/ant_location
+	/// Things that suppress food from being infested by ants when on the same turf
+	var/static/list/ant_suppressors
 	/// Time we last checked for ants
 	var/last_ant_time = 0
-	///Name of the food to show up in kitchen machines (microwaves, ovens, etc)
+	/// Name of the food to show up in kitchen machines (microwaves, ovens, etc)
 	var/ingredient_name
 	var/ingredient_name_plural
 	resistance_flags = FLAMMABLE
@@ -22,10 +27,18 @@
 
 /obj/item/reagent_containers/food/Initialize(mapload)
 	. = ..()
-	if(antable)
-		START_PROCESSING(SSobj, src)
-		ant_location = get_turf(src)
-		last_ant_time = world.time
+	if(!antable)
+		return
+
+	if(!ant_suppressors)
+		ant_suppressors = typecacheof(list(
+			/obj/structure/table,
+			/obj/structure/rack,
+			/obj/structure/closet
+		))
+	START_PROCESSING(SSobj, src)
+	ant_location = get_turf(src)
+	last_ant_time = world.time
 
 /obj/item/reagent_containers/food/Destroy()
 	ant_location = null
@@ -41,18 +54,26 @@
 
 /obj/item/reagent_containers/food/proc/check_for_ants()
 	last_ant_time = world.time
-	var/turf/T = get_turf(src)
-	if(!isturf(loc))
+
+	// Are we unshielded from the fury of space ants?
+	if(!prob(15)) // Ants are often not the smartest
 		return
-	if((locate(/obj/structure/table) in T) || (locate(/obj/structure/rack) in T))
+	if(!isturf(loc)) // Being inside something protects the food
 		return
 
-	if(ant_location == T) //It must have been on the same floor since at least the last check_for_ants()
-		if(prob(15))
-			if(!locate(/obj/effect/decal/cleanable/ants) in T)
-				new /obj/effect/decal/cleanable/ants(T)
-				antable = FALSE
-				desc += " It appears to be infested with ants. Yuck!"
-				reagents.add_reagent("ants", 1) // Don't eat things with ants in it you weirdo.
-	else
+	var/turf/T = get_turf(src)
+
+	if(T != ant_location) // Moving the food before a full ant swarm can arrive to the location also helps
 		ant_location = T
+		return
+
+	for(var/obj/structure/S in T) // Check if some object on our turf protects the food from ants
+		if(is_type_in_typecache(S, ant_suppressors))
+			return
+
+	// Dinner time!
+	if(!locate(/obj/effect/decal/cleanable/ants) in T)
+		new /obj/effect/decal/cleanable/ants(T)
+	antable = FALSE
+	desc += " It appears to be infested with ants. Yuck!"
+	reagents.add_reagent("ants", 1) // Don't eat things with ants in it you weirdo.