You can no longer get the supermatter sliver objective if the station does not have a supermatter (#21337)

* You can no longer get the supermatter sliver objective if the station does not have a supermatter

* sirryans changes

code/_globalvars/misc_globals.dm

@@ -51,3 +51,5 @@ GLOBAL_DATUM_INIT(data_core, /datum/datacore, new) // Station datacore, manifest
 GLOBAL_LIST_EMPTY(ability_verbs) // Create-level abilities
 GLOBAL_LIST_INIT(pipe_colors, list("grey" = PIPE_COLOR_GREY, "red" = PIPE_COLOR_RED, "blue" = PIPE_COLOR_BLUE, "cyan" = PIPE_COLOR_CYAN, "green" = PIPE_COLOR_GREEN, "yellow" = PIPE_COLOR_YELLOW, "purple" = PIPE_COLOR_PURPLE))
 
+GLOBAL_DATUM(main_supermatter_engine, /obj/machinery/atmospherics/supermatter_crystal)
+

code/game/gamemodes/objective.dm

@@ -507,6 +507,8 @@ GLOBAL_LIST_INIT(potential_theft_objectives, (subtypesof(/datum/theft_objective)
 				break
 		if(has_invalid_owner)
 			continue
+		if(!O.check_objective_conditions())
+			continue
 		if(O.flags & 2) // THEFT_FLAG_UNIQUE
 			continue
 

code/game/gamemodes/steal_items.dm

@@ -28,6 +28,11 @@
 			return 1
 	return 0
 
+//This proc is to be used for not granting objectives if a special requirement other than job is not met.
+
+/datum/theft_objective/proc/check_objective_conditions()
+	return TRUE
+
 /datum/proc/check_special_completion() //for objectives with special checks (is that slime extract unused? does that intellicard have an ai in it? etcetc)
 	return 1
 
@@ -144,6 +149,9 @@
 	special_equipment = /obj/item/storage/box/syndie_kit/supermatter
 	job_possession = FALSE //The CE / engineers / atmos techs do not carry around supermater slivers.
 
+/datum/theft_objective/supermatter_sliver/check_objective_conditions() //If there is no supermatter, you don't get the objective. Yes, one could order it from cargo, but I don't think that is fair, especially if we get a map without a supermatter
+	return !isnull(GLOB.main_supermatter_engine)
+
 /datum/theft_objective/plutonium_core
 	name = "the plutonium core from the station's nuclear device"
 	typepath = /obj/item/nuke_core/plutonium

code/modules/power/engines/supermatter/supermatter.dm

@@ -85,6 +85,7 @@
 #define SUPERMATTER_SINGULARITY_RAYS_COLOUR "#750000"
 #define SUPERMATTER_SINGULARITY_LIGHT_COLOUR "#400060"
 
+
 /obj/machinery/atmospherics/supermatter_crystal
 	name = "supermatter crystal"
 	desc = "A strangely translucent and iridescent crystal."
@@ -213,7 +214,8 @@
 	radio.follow_target = src
 	radio.config(list("Engineering" = 0))
 	investigate_log("has been created.", "supermatter")
-
+	if(is_main_engine)
+		GLOB.main_supermatter_engine = src
 	soundloop = new(list(src), TRUE)
 
 /obj/machinery/atmospherics/supermatter_crystal/Destroy()
@@ -227,6 +229,8 @@
 	if(!processes)
 		GLOB.frozen_atom_list -= src
 	QDEL_NULL(countdown)
+	if(is_main_engine && GLOB.main_supermatter_engine == src)
+		GLOB.main_supermatter_engine = null
 	QDEL_NULL(soundloop)
 	return ..()