Add fultons (#18958)

Content.Server/Salvage/FultonSystem.cs

@@ -0,0 +1,70 @@
+using System.Numerics;
+using Content.Shared.Salvage.Fulton;
+using Robust.Shared.Map;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Random;
+
+namespace Content.Server.Salvage;
+
+public sealed class FultonSystem : SharedFultonSystem
+{
+    [Dependency] private readonly IRobustRandom _random = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+        SubscribeLocalEvent<FultonedComponent, ComponentStartup>(OnFultonedStartup);
+        SubscribeLocalEvent<FultonedComponent, ComponentShutdown>(OnFultonedShutdown);
+    }
+
+    private void OnFultonedShutdown(EntityUid uid, FultonedComponent component, ComponentShutdown args)
+    {
+        Del(component.Effect);
+        component.Effect = EntityUid.Invalid;
+    }
+
+    private void OnFultonedStartup(EntityUid uid, FultonedComponent component, ComponentStartup args)
+    {
+        if (Exists(component.Effect))
+            return;
+
+        component.Effect = Spawn(EffectProto, new EntityCoordinates(uid, EffectOffset));
+        Dirty(uid, component);
+    }
+
+    public override void Update(float frameTime)
+    {
+        base.Update(frameTime);
+
+        var query = EntityQueryEnumerator<FultonedComponent>();
+        var curTime = Timing.CurTime;
+
+        while (query.MoveNext(out var uid, out var comp))
+        {
+            if (comp.NextFulton > curTime)
+                continue;
+
+            Fulton(uid, comp);
+        }
+    }
+
+    private void Fulton(EntityUid uid, FultonedComponent component)
+    {
+        if (!Deleted(component.Beacon))
+        {
+            var xform = Transform(uid);
+            var oldCoords = xform.Coordinates;
+            var offset = _random.NextVector2(1.5f);
+            TransformSystem.SetCoordinates(uid, new EntityCoordinates(component.Beacon.Value, offset));
+
+            RaiseNetworkEvent(new FultonAnimationMessage()
+            {
+                Entity = uid,
+                Coordinates = oldCoords,
+            });
+        }
+
+        Audio.PlayPvs(component.Sound, uid);
+        RemCompDeferred<FultonedComponent>(uid);
+    }
+}