negative shuttle timers? not on my watch maybe. also fuck magic numbers

code/controllers/shuttle_controller.dm

@@ -18,7 +18,7 @@ var/global/datum/emergency_shuttle/emergency_shuttle
 /datum/emergency_shuttle
 	var/alert = 0 //0 = emergency, 1 = crew cycle
 
-	var/location = 0 //0 = in transit (or on standby), 1 = at the station, 2 = at centcom
+	var/location = 0 //0 = in transit (or on standby) [SHUTTLE_ON_STANDBY], 1 = at the station [SHUTTLE_ON_STATION], 2 = at centcom [SHUTTLE_ON_CENTCOM]
 	var/online = 0
 	var/direction = 0 //-1 = going back to centcom (recalled), 0 = on standby, 1 = going to the station, 2 = in transit to centcom (not recalled)
 
@@ -59,11 +59,11 @@ var/global/datum/emergency_shuttle/emergency_shuttle
 	if((!universe.OnShuttleCall(null) || deny_shuttle) && alert == 1) //crew transfer shuttle does not gets recalled by gamemode
 		return
 	if(endtime)
-		setdirection(1)
+		setdirection(EMERGENCY_SHUTTLE_GOING_TO_STATION)
 	else
 		settimeleft(SHUTTLEARRIVETIME*coeff)
 		online = 1
-		setdirection(1)
+		setdirection(EMERGENCY_SHUTTLE_GOING_TO_STATION)
 		if(always_fake_recall)
 			fake_recall = rand(300,500)
 	//turning on the red lights in hallways
@@ -83,14 +83,14 @@ var/global/datum/emergency_shuttle/emergency_shuttle
 		return
 	if(!can_recall)
 		return
-	if(direction == 1)
+	if(direction == EMERGENCY_SHUTTLE_GOING_TO_STATION)
 		var/timeleft = timeleft()
 		if(alert == 0)
 			if(timeleft >= 600)
 				return
 			command_alert(/datum/command_alert/emergency_shuttle_recalled)
 			world << sound('sound/AI/shuttlerecalled.ogg')
-			setdirection(-1)
+			setdirection(EMERGENCY_SHUTTLE_RECALLED)
 			online = 1
 			for(var/area/A in areas)
 				if(istype(A, /area/hallway))
@@ -98,7 +98,7 @@ var/global/datum/emergency_shuttle/emergency_shuttle
 			return
 		else //makes it possible to send shuttle back.
 			captain_announce("The shuttle has been recalled.")
-			setdirection(-1)
+			setdirection(EMERGENCY_SHUTTLE_RECALLED)
 			online = 1
 			return
 
@@ -176,8 +176,8 @@ var/global/datum/emergency_shuttle/emergency_shuttle
 	online=0
 	shutdown=1
 
-	if(direction == 2)
-		location = 1
+	if(direction == EMERGENCY_SHUTTLE_GOING_TO_CENTCOMM)
+		location = SHUTTLE_ON_STATION
 
 		//main shuttle
 		if(shuttle && istype(shuttle,/datum/shuttle/escape))
@@ -240,7 +240,7 @@ var/global/datum/emergency_shuttle/emergency_shuttle
 /datum/emergency_shuttle/proc/shuttle_phase(var/phase, var/casual = 1)
 	switch (phase)
 		if ("station")
-			location = 1
+			location = SHUTTLE_ON_STATION
 
 			if(shuttle && istype(shuttle,/datum/shuttle/escape))
 				var/datum/shuttle/escape/E = shuttle
@@ -266,7 +266,7 @@ var/global/datum/emergency_shuttle/emergency_shuttle
 					to_chat(world, "<span class='sinister' style='font-size:3'> A vile force of darkness is making its way toward the escape shuttle.</span>")
 				*/
 		if ("transit")
-			location = 0 // in deep space
+			location = SHUTTLE_ON_STANDBY // in deep space
 
 			for(var/obj/machinery/door/unpowered/shuttle/D in shuttle.linked_area)
 				spawn(0)
@@ -274,10 +274,10 @@ var/global/datum/emergency_shuttle/emergency_shuttle
 					D.locked = 1
 
 			if (casual)
-				direction = 1
+				direction = EMERGENCY_SHUTTLE_GOING_TO_STATION
 			else
 				departed = 1 // It's going!
-				direction = 2 // heading to centcom
+				direction = EMERGENCY_SHUTTLE_GOING_TO_CENTCOMM // heading to centcom
 				settimeleft(SHUTTLETRANSITTIME)
 
 				command_alert(/datum/command_alert/emergency_shuttle_left)
@@ -307,11 +307,11 @@ var/global/datum/emergency_shuttle/emergency_shuttle
 
 		if ("centcom")
 			if (casual)
-				location = 0
-				direction = 0
+				location = SHUTTLE_ON_STANDBY
+				direction = EMERGENCY_SHUTTLE_STANDBY
 			else
 				vote_preload()
-				location = 2
+				location = EMERGENCY_SHUTTLE_GOING_TO_CENTCOMM
 
 			//if the crew brought items ordered by centcom with them, they get paid for those as if it were the supply shuttle
 			for(var/atom/movable/MA in shuttle.linked_area)
@@ -361,10 +361,22 @@ var/global/datum/emergency_shuttle/emergency_shuttle
 		warmup_sound = 0
 
 	switch(location)
-		if(0)
+		if(SHUTTLE_ON_STANDBY)
 
 			/* --- Shuttle is in transit toward centcom --- */
-			if(direction == 2)
+			if(direction == EMERGENCY_SHUTTLE_GOING_TO_CENTCOMM)
+				if(timeleft <= 0)
+				/* --- Shuttle has arrived at centcom --- */
+
+					//main shuttle
+					shuttle_phase("centcom",0)
+
+					//pods
+					for (var/pod in escape_pods)
+						move_pod(pod, "centcom")
+
+					hyperspace_sounds("end")
+					return 1
 				for(var/obj/structure/shuttle/engine/propulsion/P in shuttle.linked_area)
 					spawn()
 						P.shoot_exhaust(backward = 3)
@@ -378,24 +390,10 @@ var/global/datum/emergency_shuttle/emergency_shuttle
 				if(collision_imminent)
 					playsound(shuttle.linked_port, 'sound/misc/weather_warning.ogg', 80, 0, 7, 0, 0)
 
-				if(timeleft>0)
-					return 0
-
-				/* --- Shuttle has arrived at centcom --- */
-				else
+				return 0
 
 
 
-					//main shuttle
-					shuttle_phase("centcom",0)
-
-					//pods
-					for (var/pod in escape_pods)
-						move_pod(pod, "centcom")
-
-					hyperspace_sounds("end")
-					return 1
-
 			/* --- Shuttle has docked centcom after being recalled --- */
 			if(timeleft>timelimit)
 				online = 0
@@ -415,25 +413,9 @@ var/global/datum/emergency_shuttle/emergency_shuttle
 				shuttle_phase("station",0)
 				return 1
 
-		if(1)
-			if(timeleft <= 6 && !warmup_sound)
-				warmup_sound = 1
-				hyperspace_sounds("begin")
-			// Just before it leaves, close the damn doors!
-			if(timeleft == 2 || timeleft == 1)
-				for(var/obj/machinery/door/unpowered/shuttle/D in shuttle.linked_area)
-					spawn(0)
-						D.close()
-						D.locked = 1
-				for(var/obj/structure/shuttle/engine/propulsion/P in shuttle.linked_area)
-					spawn()
-						P.shoot_exhaust(backward = 3)
-
-			if(timeleft>0)
-				return 0
-
+		if(SHUTTLE_ON_STATION)
+			if(timeleft <= 0)
 			/* --- Shuttle leaves the station, enters transit --- */
-			else
 
 				//main shuttle
 				shuttle_phase ("transit",0)
@@ -447,6 +429,23 @@ var/global/datum/emergency_shuttle/emergency_shuttle
 
 				return 1
 
+			else if(timeleft <= 2) // Just before it leaves, close the damn doors!
+				for(var/obj/machinery/door/unpowered/shuttle/D in shuttle.linked_area)
+					spawn(0)
+						D.close()
+						D.locked = 1
+				for(var/obj/structure/shuttle/engine/propulsion/P in shuttle.linked_area)
+					spawn()
+						P.shoot_exhaust(backward = 3)
+
+			else if(timeleft <= 6 && !warmup_sound)
+				warmup_sound = 1
+				hyperspace_sounds("begin")
+
+			else
+				return 0
+
+
 		else
 			return 1