NPC refactor (#10122)

Co-authored-by: metalgearsloth <metalgearsloth@gmail.com>

Content.Server/NPC/HTN/PrimitiveTasks/Operators/Test/PickPathfindPointOperator.cs

@@ -0,0 +1,44 @@
+using System.Linq;
+using System.Threading.Tasks;
+using Content.Server.NPC.Components;
+using Robust.Shared.Random;
+
+namespace Content.Server.NPC.HTN.PrimitiveTasks.Operators.Test;
+
+public sealed class PickPathfindPointOperator : HTNOperator
+{
+    [Dependency] private readonly IEntityManager _entManager = default!;
+    [Dependency] private readonly IRobustRandom _random = default!;
+
+    public override async Task<(bool Valid, Dictionary<string, object>? Effects)> Plan(NPCBlackboard blackboard)
+    {
+        var owner = blackboard.GetValue<EntityUid>(NPCBlackboard.Owner);
+
+        // Find all pathfind points on the same grid and choose to move to it.
+        var xform = _entManager.GetComponent<TransformComponent>(owner);
+        var gridUid = xform.GridUid;
+
+        if (gridUid == null)
+            return (false, null);
+
+        var points = new List<TransformComponent>();
+
+        foreach (var (point, pointXform) in _entManager.EntityQuery<NPCPathfindPointComponent, TransformComponent>(true))
+        {
+            if (gridUid != pointXform.GridUid)
+                continue;
+
+            points.Add(pointXform);
+        }
+
+        if (points.Count == 0)
+            return (false, null);
+
+        var selected = _random.Pick(points);
+
+        return (true, new Dictionary<string, object>()
+        {
+            { NPCBlackboard.MovementTarget, selected.Coordinates }
+        });
+    }
+}