Make Syringe Guns shoot Syringes in Inject mode (#23088)

* Automatically set launched syringes to inject

* Implement for normal syringe guns too

* Put mech syringe back to draw mode if emptied when shot

* Use syringe's defines

* Move defines

* update paradise.dme

* Add comment for defines

* do not set RSG syringes to inject

---------

Co-authored-by: Arthri <41360489+a@users.noreply.github.com>

code/__DEFINES/reagents_defines.dm

@@ -24,3 +24,8 @@
 #define UNHUSK_DAMAGE_THRESHOLD 50
 ///Amount of synthflesh required to unhusk someone
 #define SYNTHFLESH_UNHUSK_AMOUNT 100
+
+///Syringe mob interaction modes
+#define SYRINGE_DRAW 0
+#define SYRINGE_INJECT 1
+#define SYRINGE_BROKEN 2

code/game/mecha/equipment/tools/medical_tools.dm

@@ -299,6 +299,7 @@
 	var/turf/trg = get_turf(target)
 	var/obj/item/reagent_containers/syringe/mechsyringe = syringes[1]
 	mechsyringe.forceMove(get_turf(chassis))
+	mechsyringe.mode = SYRINGE_INJECT
 	reagents.trans_to(mechsyringe, min(mechsyringe.volume, reagents.total_volume))
 	syringes -= mechsyringe
 	mechsyringe.icon = 'icons/obj/chemical.dmi'
@@ -331,6 +332,8 @@
 					add_attack_logs(originaloccupant, M, "Shot with [src] containing [R], transferred [mechsyringe.reagents.total_volume] units")
 					mechsyringe.reagents.reaction(M, REAGENT_INGEST)
 					mechsyringe.reagents.trans_to(M, mechsyringe.reagents.total_volume)
+					if(!mechsyringe.reagents.total_volume)
+						mechsyringe.mode = SYRINGE_DRAW
 					M.take_organ_damage(2)
 				break
 			else if(mechsyringe.loc == trg)

code/modules/projectiles/guns/syringe_gun.dm

@@ -28,6 +28,7 @@
 
 	chambered.BB = new S.projectile_type(src)
 	S.reagents.trans_to(chambered.BB, S.reagents.total_volume)
+	S.mode = SYRINGE_INJECT
 	chambered.BB.name = S.name
 
 	syringes.Remove(S)
@@ -55,6 +56,7 @@
 		// Remove the chambered syringe only if there's no syringe left
 		S = new()
 		chambered.BB.reagents.trans_to(S, chambered.BB.reagents.total_volume)
+		S.mode = SYRINGE_INJECT
 		qdel(chambered.BB)
 		chambered.BB = null
 		process_chamber()

code/modules/reagents/reagent_containers/syringes.dm

@@ -1,7 +1,3 @@
-#define SYRINGE_DRAW 0
-#define SYRINGE_INJECT 1
-#define SYRINGE_BROKEN 2
-
 /obj/item/reagent_containers/syringe
 	name = "syringe"
 	desc = "A syringe."