Trigger Refactor (#39034)

Content.Server/Trigger/Systems/SmokeOnTriggerSystem.cs

@@ -0,0 +1,68 @@
+using Content.Server.Fluids.EntitySystems;
+using Content.Server.Spreader;
+using Content.Shared.Chemistry.Components;
+using Content.Shared.Coordinates.Helpers;
+using Content.Shared.Maps;
+using Content.Shared.Trigger;
+using Content.Shared.Trigger.Components.Effects;
+using Robust.Server.GameObjects;
+using Robust.Shared.Map;
+
+namespace Content.Server.Trigger.Systems;
+
+/// <summary>
+/// Handles creating smoke when <see cref="SmokeOnTriggerComponent"/> is triggered.
+/// </summary>
+public sealed class SmokeOnTriggerSystem : EntitySystem
+{
+    [Dependency] private readonly IMapManager _mapMan = default!;
+    [Dependency] private readonly MapSystem _map = default!;
+    [Dependency] private readonly SmokeSystem _smoke = default!;
+    [Dependency] private readonly TransformSystem _transform = default!;
+    [Dependency] private readonly SpreaderSystem _spreader = default!;
+    [Dependency] private readonly TurfSystem _turf = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<SmokeOnTriggerComponent, TriggerEvent>(OnTrigger);
+    }
+
+    private void OnTrigger(Entity<SmokeOnTriggerComponent> ent, ref TriggerEvent args)
+    {
+        if (args.Key != null && !ent.Comp.KeysIn.Contains(args.Key))
+            return;
+
+        var target = ent.Comp.TargetUser ? args.User : ent.Owner;
+
+        if (target == null)
+            return;
+
+        // TODO: move all of this into an API function in SmokeSystem
+        var xform = Transform(target.Value);
+        var mapCoords = _transform.GetMapCoordinates(target.Value, xform);
+        if (!_mapMan.TryFindGridAt(mapCoords, out var gridUid, out var gridComp) ||
+            !_map.TryGetTileRef(gridUid, gridComp, xform.Coordinates, out var tileRef) ||
+            tileRef.Tile.IsEmpty)
+        {
+            return;
+        }
+
+        if (_spreader.RequiresFloorToSpread(ent.Comp.SmokePrototype.ToString()) && _turf.IsSpace(tileRef))
+            return;
+
+        var coords = _map.MapToGrid(gridUid, mapCoords);
+        var smoke = Spawn(ent.Comp.SmokePrototype, coords.SnapToGrid());
+        if (!TryComp<SmokeComponent>(smoke, out var smokeComp))
+        {
+            Log.Error($"Smoke prototype {ent.Comp.SmokePrototype} was missing SmokeComponent");
+            Del(smoke);
+            return;
+        }
+
+        _smoke.StartSmoke(smoke, ent.Comp.Solution, (float)ent.Comp.Duration.TotalSeconds, ent.Comp.SpreadAmount, smokeComp);
+
+        args.Handled = true;
+    }
+}