Add simple RCD Circuits

Port : https://github.com/tgstation/tgstation/pull/45357

code/game/machinery/doors/firedoor.dm

@@ -450,6 +450,21 @@
 				return
 	return ..()
 
+/obj/structure/firelock_frame/rcd_vals(mob/user, obj/item/construction/rcd/the_rcd)
+	if((constructionStep == CONSTRUCTION_NOCIRCUIT) && (the_rcd.upgrade & RCD_UPGRADE_SIMPLE_CIRCUITS))
+		return list("mode" = RCD_UPGRADE_SIMPLE_CIRCUITS, "delay" = 20, "cost" = 1)
+	return FALSE
+
+/obj/structure/firelock_frame/rcd_act(mob/user, obj/item/construction/rcd/the_rcd, passed_mode)
+	switch(passed_mode)
+		if(RCD_UPGRADE_SIMPLE_CIRCUITS)
+			user.visible_message("<span class='notice'>[user] fabricates a circuit and places it into [src].</span>", \
+			"<span class='notice'>You adapt a firelock circuit and slot it into the assembly.</span>")
+			constructionStep = CONSTRUCTION_GUTTED
+			update_icon()
+			return TRUE
+	return FALSE
+
 /obj/structure/firelock_frame/heavy
 	name = "heavy firelock frame"
 	reinforced = TRUE

code/game/machinery/firealarm.dm

@@ -256,6 +256,20 @@
 					return
 	return ..()
 
+/obj/machinery/firealarm/rcd_vals(mob/user, obj/item/construction/rcd/the_rcd)
+	if((buildstage == 0) && (the_rcd.upgrade & RCD_UPGRADE_SIMPLE_CIRCUITS))
+		return list("mode" = RCD_UPGRADE_SIMPLE_CIRCUITS, "delay" = 20, "cost" = 1)
+	return FALSE
+
+/obj/machinery/firealarm/rcd_act(mob/user, obj/item/construction/rcd/the_rcd, passed_mode)
+	switch(passed_mode)
+		if(RCD_UPGRADE_SIMPLE_CIRCUITS)
+			user.visible_message("<span class='notice'>[user] fabricates a circuit and places it into [src].</span>", \
+			"<span class='notice'>You adapt a fire alarm circuit and slot it into the assembly.</span>")
+			buildstage = 1
+			update_icon()
+			return TRUE
+	return FALSE
 
 /obj/machinery/firealarm/take_damage(damage_amount, damage_type = BRUTE, damage_flag = 0, sound_effect = 1, attack_dir)
 	. = ..()

code/game/objects/items/RCD.dm

@@ -85,9 +85,11 @@ RLD
 		to_chat(user, "<span class='notice'>[src] now holds [matter]/[max_matter] matter-units.</span>")
 	else if(istype(W, /obj/item/rcd_upgrade))
 		to_chat(user, "<span class='notice'>You upgrade the RCD with the [W]!</span>")
-		upgrade = TRUE
-		playsound(src.loc, 'sound/machines/click.ogg', 50, 1)
-		qdel(W)
+		var/obj/item/rcd_upgrade/rcd_up = W
+		if(!(upgrade & rcd_up.upgrade))
+			upgrade |= rcd_up.upgrade
+			playsound(src.loc, 'sound/machines/click.ogg', 50, 1)
+			qdel(W)
 	else
 		return ..()
 	update_icon()	//ensures that ammo counters (if present) get updated
@@ -116,10 +118,10 @@ RLD
 	if(matter < amount)
 		if(user)
 			to_chat(user, no_ammo_message)
-		return 0
+		return FALSE
 	matter -= amount
 	update_icon()
-	return 1
+	return TRUE
 
 /obj/item/construction/proc/checkResource(amount, mob/user)
 	. = matter >= amount
@@ -471,7 +473,7 @@ RLD
 		"Grilles & Windows" = image(icon = 'icons/mob/radial.dmi', icon_state = "grillewindow"),
 		"Floors & Walls" = image(icon = 'icons/mob/radial.dmi', icon_state = "wallfloor")
 	)
-	if(upgrade)
+	if(upgrade & RCD_UPGRADE_FRAMES)
 		choices += list(
 		"Deconstruct" = image(icon= 'icons/mob/radial.dmi', icon_state = "delete"),
 		"Machine Frames" = image(icon = 'icons/mob/radial.dmi', icon_state = "machine"),
@@ -829,9 +831,18 @@ RLD
 
 /obj/item/rcd_upgrade
 	name = "RCD advanced design disk"
-	desc = "It contains the design for machine frames, computer frames, and deconstruction."
+	desc = "It seems to be empty."
 	icon = 'icons/obj/module.dmi'
 	icon_state = "datadisk3"
+	var/upgrade
+
+/obj/item/rcd_upgrade/frames
+	desc = "It contains the design for machine frames, computer frames and deconstruction."
+	upgrade = RCD_UPGRADE_FRAMES
+
+/obj/item/rcd_upgrade/simple_circuits
+	desc = "It contains the design for firelock, air alarm, fire alarm, apc circuits and crap power cells."
+	upgrade = RCD_UPGRADE_SIMPLE_CIRCUITS
 
 #undef GLOW_MODE
 #undef LIGHT_MODE