Always call update_use_power() instead of directly setting the use_power var.

- This will let us react to the change appropriately.
- While we're here, lets define some constants so we can stop using bare numbers.
- Always use those constants when calling update_use_power()

code/modules/admin/verbs/debug.dm

@@ -539,7 +539,7 @@
 					Pump.air2.gas["nitrogen"] = 3750	//The contents of 2 canisters.
 					Pump.air2.temperature = 50
 					Pump.air2.update_values()
-				Pump.use_power=1
+				Pump.update_use_power(USE_POWER_IDLE)
 				Pump.target_pressure = 4500
 				Pump.update_icon()
 

code/modules/holodeck/HolodeckControl.dm

@@ -224,7 +224,7 @@
 			damaged = 1
 			loadProgram(powerdown_program, 0)
 			active = 0
-			use_power = 1
+			update_use_power(USE_POWER_IDLE)
 			for(var/mob/M in range(10,src))
 				M.show_message("The holodeck overloads!")
 
@@ -271,7 +271,7 @@
 			linkedholodeck.gravitychange(1)
 
 		active = 0
-		use_power = 1
+		update_use_power(USE_POWER_IDLE)
 
 
 /obj/machinery/computer/HolodeckControl/proc/loadProgram(var/prog, var/check_delay = 1)

code/modules/holomap/station_holomap.dm

@@ -126,7 +126,7 @@
 			GLOB.moved_event.register(watching_mob, src, /obj/machinery/station_map/proc/checkPosition)
 			GLOB.dir_set_event.register(watching_mob, src, /obj/machinery/station_map/proc/checkPosition)
 			GLOB.destroyed_event.register(watching_mob, src, /obj/machinery/station_map/proc/stopWatching)
-			update_use_power(2)
+			update_use_power(USE_POWER_ACTIVE)
 
 			if(bogus)
 				to_chat(user, "<span class='warning'>The holomap failed to initialize. This area of space cannot be mapped.</span>")
@@ -156,7 +156,7 @@
 		GLOB.dir_set_event.unregister(watching_mob, src)
 		GLOB.destroyed_event.unregister(watching_mob, src)
 	watching_mob = null
-	update_use_power(1)
+	update_use_power(USE_POWER_IDLE)
 
 /obj/machinery/station_map/power_change()
 	. = ..()

code/modules/mob/living/silicon/ai/ai.dm

@@ -319,14 +319,14 @@ var/list/ai_verbs_default = list(
 		qdel(src)
 		return
 	if(powered_ai.APU_power)
-		use_power = 0
+		update_use_power(USE_POWER_OFF)
 		return
 	if(!powered_ai.anchored)
 		loc = powered_ai.loc
-		use_power = 0
+		update_use_power(USE_POWER_OFF)
 		use_power(50000) // Less optimalised but only called if AI is unwrenched. This prevents usage of wrenching as method to keep AI operational without power. Intellicard is for that.
 	if(powered_ai.anchored)
-		use_power = 2
+		update_use_power(USE_POWER_ACTIVE)
 
 /mob/living/silicon/ai/proc/pick_icon()
 	set category = "AI Settings"

code/modules/modular_computers/NTNet/NTNet_relay.dm

@@ -38,9 +38,9 @@
 
 /obj/machinery/ntnet_relay/process()
 	if(operable())
-		use_power = 2
+		update_use_power(USE_POWER_ACTIVE)
 	else
-		use_power = 1
+		update_use_power(USE_POWER_IDLE)
 
 	if(dos_overload)
 		dos_overload = max(0, dos_overload - dos_dissipate)

code/modules/power/antimatter/control.dm

@@ -211,10 +211,10 @@
 /obj/machinery/power/am_control_unit/proc/toggle_power()
 	active = !active
 	if(active)
-		use_power = 2
+		update_use_power(USE_POWER_ACTIVE)
 		visible_message("The [src.name] starts up.")
 	else
-		use_power = 1
+		update_use_power(USE_POWER_IDLE)
 		visible_message("The [src.name] shuts down.")
 	update_icon()
 	return

code/modules/power/fusion/core/_core.dm

@@ -70,7 +70,7 @@ var/list/fusion_cores = list()
 	owned_field = new(loc, src)
 	owned_field.ChangeFieldStrength(field_strength)
 	icon_state = "core1"
-	use_power = 2
+	update_use_power(USE_POWER_ACTIVE)
 	. = 1
 
 /obj/machinery/power/fusion_core/proc/Shutdown(var/force_rupture)
@@ -82,7 +82,7 @@ var/list/fusion_cores = list()
 			owned_field.RadiateAll()
 		qdel(owned_field)
 		owned_field = null
-	use_power = 1
+	update_use_power(USE_POWER_IDLE)
 
 /obj/machinery/power/fusion_core/proc/AddParticles(var/name, var/quantity = 1)
 	if(owned_field)

code/modules/power/fusion/fuel_assembly/fuel_injector.dm

@@ -103,13 +103,13 @@ var/list/fuel_injectors = list()
 	if(!injecting && cur_assembly)
 		icon_state = "injector1"
 		injecting = 1
-		use_power = 1
+		update_use_power(USE_POWER_IDLE)
 
 /obj/machinery/fusion_fuel_injector/proc/StopInjecting()
 	if(injecting)
 		injecting = 0
 		icon_state = "injector0"
-		use_power = 0
+		update_use_power(USE_POWER_OFF)
 
 /obj/machinery/fusion_fuel_injector/proc/Inject()
 	if(!injecting)

code/modules/power/generator.dm

@@ -156,7 +156,7 @@
 		user.visible_message("[user.name] [anchored ? "secures" : "unsecures"] the bolts holding [src.name] to the floor.", \
 					"You [anchored ? "secure" : "unsecure"] the bolts holding [src] to the floor.", \
 					"You hear a ratchet.")
-		use_power = anchored
+		update_use_power(anchored ? USE_POWER_IDLE : USE_POWER_ACTIVE)
 		if(anchored) // Powernet connection stuff.
 			connect_to_network()
 		else

code/modules/power/lighting.dm

@@ -320,10 +320,10 @@ var/global/list/light_type_cache = list()
 					on = 0
 					set_light(0)
 			else
-				use_power = 2
+				update_use_power(USE_POWER_ACTIVE)
 				set_light(brightness_range, brightness_power, brightness_color)
 	else
-		use_power = 1
+		update_use_power(USE_POWER_IDLE)
 		set_light(0)
 
 	active_power_usage = ((light_range * light_power) * LIGHTING_POWER_FACTOR)

code/modules/power/singularity/particle_accelerator/particle_accelerator.dm

@@ -383,10 +383,10 @@ So, hopefully this is helpful if any more icons are to be added/changed/wonderin
 		if(src.construction_state < 3)//Was taken apart, update state
 			update_state()
 			if(use_power)
-				use_power = 0
+				update_use_power(USE_POWER_OFF)
 		src.construction_state = temp_state
 		if(src.construction_state >= 3)
-			use_power = 1
+			update_use_power(USE_POWER_IDLE)
 		update_icon()
 		return 1
 	return 0

code/modules/power/singularity/particle_accelerator/particle_control.dm

@@ -42,7 +42,7 @@
 
 /obj/machinery/particle_accelerator/control_box/update_state()
 	if(construction_state < 3)
-		update_use_power(0)
+		update_use_power(USE_POWER_OFF)
 		assembled = 0
 		active = 0
 		for(var/obj/structure/particle_accelerator/part in connected_parts)
@@ -52,7 +52,7 @@
 		connected_parts = list()
 		return
 	if(!part_scan())
-		update_use_power(1)
+		update_use_power(USE_POWER_IDLE)
 		active = 0
 		connected_parts = list()
 
@@ -138,9 +138,9 @@
 	..()
 	if(stat & NOPOWER)
 		active = 0
-		update_use_power(0)
+		update_use_power(USE_POWER_OFF)
 	else if(!stat && construction_state == 3)
-		update_use_power(1)
+		update_use_power(USE_POWER_IDLE)
 
 
 /obj/machinery/particle_accelerator/control_box/process()
@@ -212,13 +212,13 @@
 	message_admins("PA Control Computer turned [active ?"ON":"OFF"] by [key_name(usr, usr.client)](<A HREF='?_src_=holder;adminmoreinfo=\ref[usr]'>?</A>) in ([x],[y],[z] - <A HREF='?_src_=holder;adminplayerobservecoodjump=1;X=[x];Y=[y];Z=[z]'>JMP</a>)",0,1)
 	log_game("PACCEL([x],[y],[z]) [key_name(usr)] turned [active?"ON":"OFF"].")
 	if(active)
-		update_use_power(2)
+		update_use_power(USE_POWER_ACTIVE)
 		for(var/obj/structure/particle_accelerator/part in connected_parts)
 			part.strength = src.strength
 			part.powered = 1
 			part.update_icon()
 	else
-		update_use_power(1)
+		update_use_power(USE_POWER_IDLE)
 		for(var/obj/structure/particle_accelerator/part in connected_parts)
 			part.strength = null
 			part.powered = 0

code/modules/power/supermatter/setup_supermatter.dm

@@ -126,7 +126,7 @@ GLOBAL_LIST_BOILERPLATE(all_engine_setup_markers, /obj/effect/engine_setup)
 		log_and_message_admins("## WARNING: Unable to locate pump at [x] [y] [z]!")
 		return SETUP_WARNING
 	P.target_pressure = P.max_pressure_setting
-	P.use_power = 1
+	P.update_use_power(USE_POWER_IDLE)
 	P.update_icon()
 	return SETUP_OK
 
@@ -259,7 +259,7 @@ GLOBAL_LIST_BOILERPLATE(all_engine_setup_markers, /obj/effect/engine_setup)
 				return SETUP_WARNING
 		F.rebuild_filtering_list()
 
-	F.use_power = 1
+	F.update_use_power(USE_POWER_IDLE)
 	F.update_icon()
 	return SETUP_OK
 

code/modules/recycling/disposal.dm

@@ -359,7 +359,7 @@
 // charge the gas reservoir and perform flush if ready
 /obj/machinery/disposal/process()
 	if(!air_contents || (stat & BROKEN))			// nothing can happen if broken
-		update_use_power(0)
+		update_use_power(USE_POWER_OFF)
 		return
 
 	flush_count++
@@ -377,7 +377,7 @@
 		flush()
 
 	if(mode != 1) //if off or ready, no need to charge
-		update_use_power(1)
+		update_use_power(USE_POWER_IDLE)
 	else if(air_contents.return_pressure() >= SEND_PRESSURE)
 		mode = 2 //if full enough, switch to ready mode
 		update()
@@ -386,7 +386,7 @@
 
 /obj/machinery/disposal/proc/pressurize()
 	if(stat & NOPOWER)			// won't charge if no power
-		update_use_power(0)
+		update_use_power(USE_POWER_OFF)
 		return
 
 	var/atom/L = loc						// recharging from loc turf

code/modules/shieldgen/emergency_shield.dm

@@ -156,7 +156,7 @@
 	idle_power_usage = 0
 	for(var/obj/machinery/shield/shield_tile in deployed_shields)
 		idle_power_usage += shield_tile.shield_idle_power
-	update_use_power(1)
+	update_use_power(USE_POWER_IDLE)
 
 /obj/machinery/shieldgen/proc/shields_down()
 	if(!active) return 0 //If it's already off, how did this get called?
@@ -166,7 +166,7 @@
 
 	collapse_shields()
 
-	update_use_power(0)
+	update_use_power(USE_POWER_OFF)
 
 /obj/machinery/shieldgen/proc/create_shields()
 	for(var/turf/target_tile in range(2, src))

code/modules/shieldgen/shield_diffuser.dm

@@ -57,7 +57,7 @@
 		update_icon()
 		return
 	enabled = !enabled
-	use_power = enabled + 1
+	update_use_power(enabled ? USE_POWER_ACTIVE : USE_POWER_IDLE)
 	update_icon()
 	to_chat(usr, "You turn \the [src] [enabled ? "on" : "off"].")
 

code/modules/xenoarcheaology/artifacts/autocloner.dm

@@ -54,7 +54,7 @@
 		//if we've finished growing...
 		if(time_spent_spawning >= time_per_spawn)
 			time_spent_spawning = 0
-			use_power = 1
+			update_use_power(USE_POWER_IDLE)
 			src.visible_message("<span class='notice'>\icon[src] [src] pings!</span>")
 			icon_state = "cellold1"
 			desc = "It's full of a bubbling viscous liquid, and is lit by a mysterious glow."
@@ -63,11 +63,11 @@
 
 		//if we're getting close to finished, kick into overdrive power usage
 		if(time_spent_spawning / time_per_spawn > 0.75)
-			use_power = 2
+			update_use_power(USE_POWER_ACTIVE)
 			icon_state = "cellold2"
 			desc = "It's full of a bubbling viscous liquid, and is lit by a mysterious glow. A dark shape appears to be forming inside..."
 		else
-			use_power = 1
+			update_use_power(USE_POWER_IDLE)
 			icon_state = "cellold1"
 			desc = "It's full of a bubbling viscous liquid, and is lit by a mysterious glow."
 

code/modules/xenoarcheaology/artifacts/replicator.dm

@@ -104,7 +104,7 @@
 			max_spawn_time = rand(30,100)
 
 			if(!spawning_types.len || !stored_materials.len)
-				use_power = 1
+				update_use_power(USE_POWER_IDLE)
 				icon_state = "borgcharger0(old)"
 
 		else if(prob(5))
@@ -145,7 +145,7 @@
 
 				spawning_types.Add(construction[construction[index]])
 				spawn_progress_time = 0
-				use_power = 2
+				update_use_power(USE_POWER_ACTIVE)
 				icon_state = "borgcharger1(old)"
 			else
 				src.visible_message(fail_message)

code/modules/xenoarcheaology/tools/artifact_harvester.dm

@@ -80,7 +80,7 @@
 
 		//check if we've finished
 		if(inserted_battery.stored_charge >= inserted_battery.capacity)
-			use_power = 1
+			update_use_power(USE_POWER_IDLE)
 			harvesting = 0
 			cur_artifact.anchored = 0
 			cur_artifact.being_used = 0
@@ -105,7 +105,7 @@
 
 		//if there's no charge left, finish
 		if(inserted_battery.stored_charge <= 0)
-			use_power = 1
+			update_use_power(USE_POWER_IDLE)
 			inserted_battery.stored_charge = 0
 			harvesting = 0
 			if(inserted_battery.battery_effect && inserted_battery.battery_effect.activated)
@@ -191,7 +191,7 @@
 
 						if(source_effect)
 							harvesting = 1
-							use_power = 2
+							update_use_power(USE_POWER_ACTIVE)
 							cur_artifact.anchored = 1
 							cur_artifact.being_used = 1
 							icon_state = "incubator_on"
@@ -235,7 +235,7 @@
 						inserted_battery.battery_effect.ToggleActivate(1)
 					last_process = world.time
 					harvesting = -1
-					use_power = 2
+					update_use_power(USE_POWER_ACTIVE)
 					icon_state = "incubator_on"
 					var/message = "<b>[src]</b> states, \"Warning, battery charge dump commencing.\""
 					src.visible_message(message)