Timestop spell (#370)

* - tweak: Tweak mindswap.

* - fix: Mindswap and cult fixes.

* - add: Timestop v1.

* - add: Timestop spell.

* - remove: What?

* - fix: Fixes.

Content.Shared/_White/Wizard/Timestop/FreezeContactsSystem.cs

@@ -0,0 +1,183 @@
+using System.Linq;
+using System.Numerics;
+using Content.Shared.ActionBlocker;
+using Content.Shared.Emoting;
+using Content.Shared.Hands;
+using Content.Shared.Interaction.Events;
+using Content.Shared.Inventory.Events;
+using Content.Shared.Item;
+using Content.Shared.Movement.Events;
+using Content.Shared.Speech;
+using Content.Shared.Throwing;
+using Robust.Shared.Containers;
+using Robust.Shared.Physics;
+using Robust.Shared.Physics.Components;
+using Robust.Shared.Physics.Events;
+using Robust.Shared.Physics.Systems;
+using Robust.Shared.Spawners;
+
+namespace Content.Shared._White.Wizard.Timestop;
+
+public sealed class FreezeContactsSystem : EntitySystem
+{
+    [Dependency] private readonly SharedPhysicsSystem _physics = default!;
+    [Dependency] private readonly SharedContainerSystem _container = default!;
+    [Dependency] private readonly ActionBlockerSystem _blocker = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<FreezeContactsComponent, StartCollideEvent>(OnEntityEnter);
+        SubscribeLocalEvent<FreezeContactsComponent, EndCollideEvent>(OnEntityExit);
+        SubscribeLocalEvent<FrozenComponent, ComponentInit>(OnInit);
+        SubscribeLocalEvent<FrozenComponent, ComponentRemove>(OnRemove);
+        SubscribeLocalEvent<FrozenComponent, PreventCollideEvent>(OnPreventCollide);
+        SubscribeLocalEvent<FrozenComponent, EntGotInsertedIntoContainerMessage>(OnGetInserted);
+
+        SubscribeLocalEvent<FrozenComponent, SpeakAttemptEvent>(OnAttempt);
+        SubscribeLocalEvent<FrozenComponent, EmoteAttemptEvent>(OnAttempt);
+        SubscribeLocalEvent<FrozenComponent, ChangeDirectionAttemptEvent>(OnAttempt);
+        SubscribeLocalEvent<FrozenComponent, UpdateCanMoveEvent>(OnMoveAttempt);
+        SubscribeLocalEvent<FrozenComponent, InteractionAttemptEvent>(OnAttempt);
+        SubscribeLocalEvent<FrozenComponent, UseAttemptEvent>(OnAttempt);
+        SubscribeLocalEvent<FrozenComponent, ThrowAttemptEvent>(OnAttempt);
+        SubscribeLocalEvent<FrozenComponent, DropAttemptEvent>(OnAttempt);
+        SubscribeLocalEvent<FrozenComponent, AttackAttemptEvent>(OnAttempt);
+        SubscribeLocalEvent<FrozenComponent, PickupAttemptEvent>(OnAttempt);
+        SubscribeLocalEvent<FrozenComponent, IsEquippingAttemptEvent>(OnEquipAttempt);
+        SubscribeLocalEvent<FrozenComponent, IsUnequippingAttemptEvent>(OnUnequipAttempt);
+    }
+
+    private void OnMoveAttempt(EntityUid uid, FrozenComponent component, UpdateCanMoveEvent args)
+    {
+        if (component.LifeStage > ComponentLifeStage.Running)
+            return;
+
+        args.Cancel();
+    }
+
+    private void OnAttempt(EntityUid uid, FrozenComponent component, CancellableEntityEventArgs args)
+    {
+        args.Cancel();
+    }
+
+    private void OnEquipAttempt(EntityUid uid, FrozenComponent component, IsEquippingAttemptEvent args)
+    {
+        // is this a self-equip, or are they being stripped?
+        if (args.Equipee == uid)
+            args.Cancel();
+    }
+
+    private void OnUnequipAttempt(EntityUid uid, FrozenComponent component, IsUnequippingAttemptEvent args)
+    {
+        // is this a self-equip, or are they being stripped?
+        if (args.Unequipee == uid)
+            args.Cancel();
+    }
+
+    private void OnGetInserted(Entity<FrozenComponent> ent, ref EntGotInsertedIntoContainerMessage args)
+    {
+        RemCompDeferred<FrozenComponent>(ent);
+    }
+
+    private void OnPreventCollide(Entity<FrozenComponent> ent, ref PreventCollideEvent args)
+    {
+        if (args.OurBody.BodyType == BodyType.Dynamic && !HasComp<FreezeContactsComponent>(args.OtherEntity))
+            args.Cancelled = true;
+    }
+
+    private void OnRemove(Entity<FrozenComponent> ent, ref ComponentRemove args)
+    {
+        var (uid, comp) = ent;
+
+        _blocker.UpdateCanMove(uid);
+
+        if (_container.IsEntityOrParentInContainer(uid))
+            return;
+
+        if (!TryComp(uid, out PhysicsComponent? physics))
+            return;
+
+        _physics.SetLinearVelocity(uid, comp.OldLinearVelocity, false, body: physics);
+        _physics.SetAngularVelocity(uid, comp.OldAngularVelocity, body: physics);
+    }
+
+    private void OnInit(Entity<FrozenComponent> ent, ref ComponentInit args)
+    {
+        var (uid, comp) = ent;
+
+        _blocker.UpdateCanMove(uid);
+
+        if (!TryComp(uid, out PhysicsComponent? physics))
+            return;
+
+        comp.OldLinearVelocity = physics.LinearVelocity;
+        comp.OldAngularVelocity = physics.AngularVelocity;
+
+        _physics.SetLinearVelocity(uid, Vector2.Zero, false, body: physics);
+        _physics.SetAngularVelocity(uid, 0f, body: physics);
+    }
+
+    public override void Update(float frameTime)
+    {
+        base.Update(frameTime);
+
+        var query = AllEntityQuery<FrozenComponent, FixturesComponent, PhysicsComponent>();
+
+        while (query.MoveNext(out var uid, out var frozen, out var fixtures, out var physics))
+        {
+            frozen.Lifetime -= frameTime;
+
+            if (physics.LinearVelocity != Vector2.Zero)
+                _physics.SetLinearVelocity(uid, Vector2.Zero, manager: fixtures, body: physics);
+
+            if (physics.AngularVelocity != 0f)
+                _physics.SetAngularVelocity(uid, 0f, manager: fixtures, body: physics);
+
+            if (frozen.Lifetime > 0)
+                continue;
+
+            RemCompDeferred<FrozenComponent>(uid);
+        }
+    }
+
+    private void OnEntityExit(Entity<FreezeContactsComponent> ent, ref EndCollideEvent args)
+    {
+        if (IsTouchingFrozenContacts(args.OtherEntity, args.OtherBody))
+            return;
+
+        RemCompDeferred<FrozenComponent>(args.OtherEntity);
+    }
+
+    private void OnEntityEnter(Entity<FreezeContactsComponent> ent, ref StartCollideEvent args)
+    {
+        var hadFrozen = HasComp<FrozenComponent>(args.OtherEntity);
+        var frozen = EnsureComp<FrozenComponent>(args.OtherEntity);
+
+        if (!TryComp(ent, out TimedDespawnComponent? timedDespawn))
+            return;
+
+        frozen.Lifetime = timedDespawn.Lifetime;
+
+        if (TryComp(args.OtherEntity, out TimedDespawnComponent? otherTimedDespawn))
+            otherTimedDespawn.Lifetime += timedDespawn.Lifetime;
+
+        if (hadFrozen)
+            return;
+
+        if (!TryComp(args.OtherEntity, out ThrownItemComponent? thrownItem))
+            return;
+
+        if (thrownItem.LandTime != null)
+            thrownItem.LandTime = thrownItem.LandTime.Value + TimeSpan.FromSeconds(timedDespawn.Lifetime);
+
+        if (thrownItem.ThrownTime != null)
+            thrownItem.ThrownTime = thrownItem.ThrownTime.Value + TimeSpan.FromSeconds(timedDespawn.Lifetime);
+    }
+
+    private bool IsTouchingFrozenContacts(EntityUid uid, PhysicsComponent body)
+    {
+        return _physics.GetContactingEntities(uid, body).Any(HasComp<FreezeContactsComponent>);
+    }
+}