Office Chair Overlapping Tweak + Slightly better layer logic for chairs (1 line lol) (#27844)

* Add Office Chair to the Armrest system, tiny refactor of armrest system.

* Implicit armrest null from DrSmail

Co-authored-by: Drsmail <60036448+Drsmail@users.noreply.github.com>
Signed-off-by: Tojo <32783144+Alecksohs@users.noreply.github.com>

* Update code/game/objects/structures/stool_bed_chair_nest/chairs.dm

Co-authored-by: Luc <89928798+lewcc@users.noreply.github.com>
Signed-off-by: Tojo <32783144+Alecksohs@users.noreply.github.com>

* Update code/game/objects/structures/stool_bed_chair_nest/chairs.dm

Co-authored-by: Luc <89928798+lewcc@users.noreply.github.com>
Signed-off-by: Tojo <32783144+Alecksohs@users.noreply.github.com>

* Update code/game/objects/structures/stool_bed_chair_nest/chairs.dm

Co-authored-by: Luc <89928798+lewcc@users.noreply.github.com>
Signed-off-by: Tojo <32783144+Alecksohs@users.noreply.github.com>

* Yeah so I impulsively ported the entirety of this system without knowing what it did

* Revert "Yeah so I impulsively ported the entirety of this system without knowing what it did"

This reverts commit d4edb72a3b.

---------

Signed-off-by: Tojo <32783144+Alecksohs@users.noreply.github.com>
Co-authored-by: Drsmail <60036448+Drsmail@users.noreply.github.com>
Co-authored-by: Luc <89928798+lewcc@users.noreply.github.com>

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

@@ -21,6 +21,8 @@
 	var/comfort = 0
 	/// Used to handle rotation properly, should only be 1, 4, or 8
 	var/possible_dirs = 4
+	/// Will it set to the layer above the player or not? Use with Armrests.
+	var/uses_armrest = FALSE 
 
 /obj/structure/chair/examine(mob/user)
 	. = ..()
@@ -111,7 +113,7 @@
 	if(possible_dirs == 8) // We don't want chairs with corner dirs to sit over mobs, it is handled by armrests
 		layer = OBJ_LAYER
 		return
-	if(has_buckled_mobs() && dir == NORTH)
+	if(has_buckled_mobs() && dir == NORTH && !uses_armrest)
 		layer = ABOVE_MOB_LAYER
 	else
 		layer = OBJ_LAYER
@@ -247,6 +249,8 @@
 	movable = TRUE
 	item_chair = null
 	buildstackamount = 5
+	var/image/armrest
+	uses_armrest = TRUE
 
 /obj/structure/chair/comfy/shuttle
 	name = "shuttle seat"
@@ -278,6 +282,34 @@
 /obj/structure/chair/office/dark
 	icon_state = "officechair_dark"
 
+/obj/structure/chair/office/proc/get_armrest()
+	return mutable_appearance('icons/obj/chairs.dmi', "[icon_state]_armrest")
+
+/obj/structure/chair/office/Initialize(mapload)
+	armrest = get_armrest()
+	armrest.layer = ABOVE_MOB_LAYER
+	return ..()
+
+/obj/structure/chair/office/Destroy()
+	QDEL_NULL(armrest)
+	return ..()
+
+/obj/structure/chair/office/post_buckle_mob(mob/living/M)
+	. = ..()
+	update_armrest()
+
+/obj/structure/chair/office/post_unbuckle_mob(mob/living/M)
+	. = ..()
+	update_armrest()
+
+/obj/structure/chair/office/proc/update_armrest()
+	if(has_buckled_mobs())
+		add_overlay(armrest)
+	else
+		cut_overlay(armrest)
+
+
+
 /obj/structure/chair/barber
 	icon_state = "barber_chair"
 	buildstackamount = 1