Shuttle drone improvements (#16931)

Content.Server/Shuttles/Systems/ShuttleSystem.GridFill.cs

@@ -1,5 +1,7 @@
 using Content.Server.Shuttles.Components;
 using Content.Server.Station.Components;
+using Content.Server.Station.Events;
+using Content.Shared.Cargo.Components;
 using Content.Shared.CCVar;
 
 namespace Content.Server.Shuttles.Systems;
@@ -8,11 +10,88 @@ public sealed partial class ShuttleSystem
 {
     private void InitializeGridFills()
     {
+        SubscribeLocalEvent<GridSpawnComponent, StationPostInitEvent>(OnGridSpawnPostInit);
         SubscribeLocalEvent<GridFillComponent, MapInitEvent>(OnGridFillMapInit);
+
+        _cfg.OnValueChanged(CCVars.GridFill, OnGridFillChange);
+    }
+
+    private void ShutdownGridFills()
+    {
+        _cfg.UnsubValueChanged(CCVars.GridFill, OnGridFillChange);
+    }
+
+    private void OnGridFillChange(bool obj)
+    {
+        // If you're doing this on live then god help you,
+        if (obj)
+        {
+            var query = AllEntityQuery<GridSpawnComponent>();
+
+            while (query.MoveNext(out var uid, out var comp))
+            {
+                GridSpawns(uid, comp);
+            }
+        }
+    }
+
+    private void OnGridSpawnPostInit(EntityUid uid, GridSpawnComponent component, ref StationPostInitEvent args)
+    {
+        GridSpawns(uid, component);
+    }
+
+    private void GridSpawns(EntityUid uid, GridSpawnComponent component)
+    {
+        if (!_cfg.GetCVar(CCVars.GridFill))
+            return;
+
+        if (!TryComp<StationDataComponent>(uid, out var data))
+        {
+            return;
+        }
+
+        var targetGrid = _station.GetLargestGrid(data);
+
+        if (targetGrid == null)
+            return;
+
+        // Spawn on a dummy map and try to FTL if possible, otherwise dump it.
+        var mapId = _mapManager.CreateMap();
+        var valid = true;
+
+        foreach (var path in component.Paths)
+        {
+            if (_loader.TryLoad(mapId, path.ToString(), out var ent) && ent.Count == 1)
+            {
+                if (TryComp<ShuttleComponent>(ent[0], out var shuttle))
+                {
+                    TryFTLProximity(ent[0], shuttle, targetGrid.Value);
+                    _station.AddGridToStation(uid, ent[0]);
+                }
+                else
+                {
+                    valid = false;
+                }
+            }
+            else
+            {
+                valid = false;
+            }
+
+            if (!valid)
+            {
+                _sawmill.Error($"Error loading gridspawn for {ToPrettyString(uid)} / {path}");
+            }
+        }
+
+        _mapManager.DeleteMap(mapId);
     }
 
     private void OnGridFillMapInit(EntityUid uid, GridFillComponent component, MapInitEvent args)
     {
+        if (!_cfg.GetCVar(CCVars.GridFill))
+            return;
+
         if (!TryComp<DockingComponent>(uid, out var dock) ||
             !TryComp<TransformComponent>(uid, out var xform) ||
             xform.GridUid == null)
@@ -20,9 +99,6 @@ public sealed partial class ShuttleSystem
             return;
         }
 
-        if (_cfg.GetCVar(CCVars.DisableGridFill))
-            return;
-
         // Spawn on a dummy map and try to dock if possible, otherwise dump it.
         var mapId = _mapManager.CreateMap();
         var valid = false;