OH GOD YOU CAN BUILD PODS NOW OH GOD

code/datums/helper_datums/construction_datum.dm

@@ -45,6 +45,36 @@
 		return 0
 
 	proc/custom_action(step, used_atom, user)
+		if(istype(used_atom, /obj/item/weapon/weldingtool))
+			var/obj/item/weapon/weldingtool/W = used_atom
+			if (W.remove_fuel(0, user))
+				playsound(holder, 'sound/items/Welder2.ogg', 50, 1)
+			else
+				return 0
+		else if(istype(used_atom, /obj/item/weapon/wrench))
+			playsound(holder, 'sound/items/Ratchet.ogg', 50, 1)
+
+		else if(istype(used_atom, /obj/item/weapon/screwdriver))
+			playsound(holder, 'sound/items/Screwdriver.ogg', 50, 1)
+
+		else if(istype(used_atom, /obj/item/weapon/wirecutters))
+			playsound(holder, 'sound/items/Wirecutter.ogg', 50, 1)
+
+		else if(istype(used_atom, /obj/item/weapon/cable_coil))
+			var/obj/item/weapon/cable_coil/C = used_atom
+			if(C.amount<4)
+				user << ("There's not enough cable to finish the task.")
+				return 0
+			else
+				C.use(4)
+				playsound(holder, 'sound/items/Deconstruct.ogg', 50, 1)
+		else if(istype(used_atom, /obj/item/stack))
+			var/obj/item/stack/S = used_atom
+			if(S.amount < 5)
+				user << ("There's not enough material in this stack.")
+				return 0
+			else
+				S.use(5)
 		return 1
 
 	proc/check_all_steps(atom/used_atom,mob/user as mob) //check all steps, remove matching one.
@@ -106,7 +136,6 @@
 					return 0
 		return 1
 
-
 /datum/construction/reversible
 	var/index
 
@@ -144,4 +173,84 @@
 		return 0
 
 	custom_action(index, diff, used_atom, user)
-		return 1
+		if(!..(index,used_atom,user))
+			return 0
+		return 1
+
+#define state_next "next"
+#define state_prev "prev"
+
+/datum/construction/reversible2
+	var/index
+	var/base_icon = "durand"
+
+	New(atom)
+		..()
+		index = 1
+		return
+
+	proc/update_index(diff as num, mob/user as mob)
+		index-=diff
+		if(index==steps.len+1)
+			spawn_result(user)
+		else
+			set_desc(index)
+		return
+
+	proc/update_icon()
+		holder.icon_state="[base_icon]_[index]"
+
+	is_right_key(mob/user as mob,atom/used_atom) // returns index step
+		var/list/state = steps[index]
+		if(state_next in state)
+			var/list/step = state[state_next]
+			if(istype(used_atom, step["key"]))
+				//if(L["consume"] && !try_consume(used_atom,L["consume"]))
+				//	return 0
+				return FORWARD //to the first step -> forward
+		else if(state_prev in state)
+			var/list/step = state[state_prev]
+			if(istype(used_atom, step["key"]))
+				//if(L["consume"] && !try_consume(used_atom,L["consume"]))
+				//	return 0
+				return BACKWARD //to the first step -> forward
+		return 0
+
+	check_step(atom/used_atom,mob/user as mob)
+		var/diff = is_right_key(user,used_atom)
+		if(diff)
+			if(custom_action(index, diff, used_atom, user))
+				update_index(diff,user)
+				update_icon()
+				return 1
+		return 0
+
+	proc/fixText(text,user)
+		text = replacetext(text,"{USER}","[user]")
+		text = replacetext(text,"{HOLDER}","[holder]")
+		return text
+
+	custom_action(index, diff, used_atom, var/mob/user)
+		if(!..(index,used_atom,user))
+			return 0
+
+		var/list/step = steps[index]
+		var/list/state = step[diff==FORWARD ? state_next : state_prev]
+		user.visible_message(fixText(state["vis_msg"],user),fixText(state["self_msg"],user))
+
+		if("delete" in state)
+			del(used_atom)
+		else if("spawn" in state)
+			var/spawntype=state["spawn"]
+			var/atom/A = new spawntype(holder.loc)
+			if("amount" in state)
+				if(istype(A,/obj/item/weapon/cable_coil))
+					var/obj/item/weapon/cable_coil/C=A
+					C.amount=state["amount"]
+				if(istype(A,/obj/item/stack))
+					var/obj/item/stack/S=A
+					S.amount=state["amount"]
+
+		return 1
+	action(used_atom,user)
+		return check_step(used_atom,user)