Uplink item buy limit mechanism (#14999)

code/datums/uplink/devices_and_tools.dm

@@ -70,8 +70,10 @@
 
 /datum/uplink_item/item/tools/personal_shield
 	name = "Personal Shield"
-	desc = "A personal shield that, when kept in your hand and activated, will protect its user from five projectile shots."
+	desc = "A personal shield that, when kept in your hand and activated, will protect its user from five projectile shots. \
+	        This can only be bought once."
 	item_cost = 1
+	item_limit = 1
 	path = /obj/item/device/personal_shield
 
 /datum/uplink_item/item/tools/hacking_tool

code/datums/uplink/implants.dm

@@ -29,7 +29,7 @@
 
 /datum/uplink_item/item/implants/imp_uplink
 	name = "Uplink Implant"
-	path = /obj/item/storage/box/syndie_kit/imp_uplink
+	path = /obj/item/implanter/uplink
 
 /datum/uplink_item/item/implants/imp_uplink/New()
 	..()

code/datums/uplink/medical.dm

@@ -61,6 +61,13 @@
 	item_cost = 1
 	path = /obj/item/storage/firstaid/regular
 
+/datum/uplink_item/item/medical/firstaid
+	name = "Standard First-Aid Kit (Free)"
+	item_cost = 0
+	item_limit = 1
+	path = /obj/item/storage/firstaid/regular
+	desc = "You can claim this first-aid kit only once."
+
 /datum/uplink_item/item/medical/advfirstaid
 	name = "Advanced First-Aid Kit"
 	item_cost = 1

code/datums/uplink/uplink_items.dm

@@ -29,6 +29,7 @@ var/datum/uplink/uplink
 	var/name
 	var/desc
 	var/item_cost = 0
+	var/item_limit = 999 // how many times can this item be bought from a uplink (high limit is not shown in the uplink gui)
 	var/datum/uplink_category/category		// Item category
 	var/list/datum/antagonist/antag_roles	// Antag roles this item is displayed to. If empty, display to all.
 	var/list/datum/antagonist/antag_job     // Antag job this item is displayed to, if empty, display to all.
@@ -53,6 +54,14 @@ var/datum/uplink/uplink
 	if(!goods)
 		return
 
+	var/obj/item/implanter/implanter = goods
+	if(istype(implanter))
+		var/obj/item/implant/uplink/uplink_implant = implanter.imp
+		if(istype(uplink_implant))
+			var/obj/item/device/uplink/hidden/hidden_uplink = uplink_implant.hidden_uplink
+			if(istype(hidden_uplink))
+				hidden_uplink.purchase_log = U.purchase_log
+	
 	purchase_log(U)
 	U.uses -= cost
 	U.used_TC += cost
@@ -66,8 +75,14 @@ var/datum/uplink/uplink
 	if(cost(U.uses) > U.uses)
 		return 0
 
+	if(items_left(U) <= 0)
+		return 0
+
 	return can_view(U)
 
+/datum/uplink_item/proc/items_left(obj/item/device/uplink/U)
+	return item_limit - U.purchase_log[src]
+		
 /datum/uplink_item/proc/can_view(obj/item/device/uplink/U)
 	// Making the assumption that if no uplink was supplied, then we don't care about antag roles
 	if(!U || (!length(antag_roles) && !antag_job))