Pulling rework (#20906)

* Pulling rework

Fixing up the FOUR systems managing pulling, all the shitcode, and also making it nicer ingame.

* More pulling cleanup

* stats

* More cleanup

* First draft

* More pulling

* weh

* Fix puller

* Pulling working

* Fix merge

* Dunked

* Self-merge time

Content.Shared/Movement/Pulling/Events/AttemptPullEvent.cs

@@ -0,0 +1,13 @@
+using Robust.Shared.Physics.Components;
+
+namespace Content.Shared.Movement.Pulling.Events;
+
+/// <summary>
+/// Raised directed on puller and pullable to determine if it can be pulled.
+/// </summary>
+public sealed class PullAttemptEvent : PullMessage
+{
+    public PullAttemptEvent(EntityUid pullerUid, EntityUid pullableUid) : base(pullerUid, pullableUid) { }
+
+    public bool Cancelled { get; set; }
+}

Content.Shared/Movement/Pulling/Events/AttemptStopPullingEvent.cs

@@ -0,0 +1,10 @@
+namespace Content.Shared.Pulling.Events;
+
+/// <summary>
+/// Raised when a request is made to stop pulling an entity.
+/// </summary>
+public record struct AttemptStopPullingEvent(EntityUid? User = null)
+{
+    public readonly EntityUid? User = User;
+    public bool Cancelled;
+}

Content.Shared/Movement/Pulling/Events/BeingPulledAttemptEvent.cs

@@ -0,0 +1,17 @@
+namespace Content.Shared.Pulling.Events
+{
+    /// <summary>
+    ///     Directed event raised on the pulled to see if it can be pulled.
+    /// </summary>
+    public sealed class BeingPulledAttemptEvent : CancellableEntityEventArgs
+    {
+        public BeingPulledAttemptEvent(EntityUid puller, EntityUid pulled)
+        {
+            Puller = puller;
+            Pulled = pulled;
+        }
+
+        public EntityUid Puller { get; }
+        public EntityUid Pulled { get; }
+    }
+}

Content.Shared/Movement/Pulling/Events/PullMessage.cs

@@ -0,0 +1,13 @@
+namespace Content.Shared.Movement.Pulling.Events;
+
+public abstract class PullMessage : EntityEventArgs
+{
+    public readonly EntityUid PullerUid;
+    public readonly EntityUid PulledUid;
+
+    protected PullMessage(EntityUid pullerUid, EntityUid pulledUid)
+    {
+        PullerUid = pullerUid;
+        PulledUid = pulledUid;
+    }
+}

Content.Shared/Movement/Pulling/Events/PullStartedMessage.cs

@@ -0,0 +1,9 @@
+namespace Content.Shared.Movement.Pulling.Events;
+
+public sealed class PullStartedMessage : PullMessage
+{
+    public PullStartedMessage(EntityUid pullerUid, EntityUid pullableUid) :
+        base(pullerUid, pullableUid)
+    {
+    }
+}

Content.Shared/Movement/Pulling/Events/PullStoppedMessage.cs

@@ -0,0 +1,13 @@
+using Robust.Shared.Physics.Components;
+
+namespace Content.Shared.Movement.Pulling.Events;
+
+/// <summary>
+/// Raised directed on both puller and pullable.
+/// </summary>
+public sealed class PullStoppedMessage : PullMessage
+{
+    public PullStoppedMessage(EntityUid pullerUid, EntityUid pulledUid) : base(pullerUid, pulledUid)
+    {
+    }
+}

Content.Shared/Movement/Pulling/Events/StartPullAttemptEvent.cs

@@ -0,0 +1,17 @@
+namespace Content.Shared.Pulling.Events
+{
+    /// <summary>
+    ///     Directed event raised on the puller to see if it can start pulling something.
+    /// </summary>
+    public sealed class StartPullAttemptEvent : CancellableEntityEventArgs
+    {
+        public StartPullAttemptEvent(EntityUid puller, EntityUid pulled)
+        {
+            Puller = puller;
+            Pulled = pulled;
+        }
+
+        public EntityUid Puller { get; }
+        public EntityUid Pulled { get; }
+    }
+}