Revert "Physics (#3452)"

This reverts commit 3e64fd56a1.

Content.Server/GameObjects/Components/Projectiles/ThrownItemComponent.cs

@@ -0,0 +1,118 @@
+using Content.Server.GameObjects.EntitySystems.Click;
+using Content.Shared.GameObjects;
+using Content.Shared.Physics;
+using Robust.Server.GameObjects;
+using Robust.Shared.GameObjects;
+using Robust.Shared.IoC;
+using Robust.Shared.Maths;
+using Robust.Shared.Physics;
+
+namespace Content.Server.GameObjects.Components.Projectiles
+{
+    [RegisterComponent]
+    internal class ThrownItemComponent : ProjectileComponent, ICollideBehavior
+    {
+        public const float DefaultThrowTime = 0.25f;
+
+        private bool _shouldCollide = true;
+        private bool _shouldStop = false;
+
+        public override string Name => "ThrownItem";
+        public override uint? NetID => ContentNetIDs.THROWN_ITEM;
+
+        /// <summary>
+        ///     User who threw the item.
+        /// </summary>
+        public IEntity User { get; set; }
+
+        void ICollideBehavior.CollideWith(IEntity entity)
+        {
+            if (!_shouldCollide || entity.Deleted) return;
+            if (entity.TryGetComponent(out PhysicsComponent collid))
+            {
+                if (!collid.Hard) // ignore non hard
+                    return;
+
+                _shouldStop = true; // hit something hard => stop after this collision
+
+                // Raise an event.
+                EntitySystem.Get<InteractionSystem>().ThrowCollideInteraction(User, Owner, entity, Owner.Transform.Coordinates);
+            }
+
+            // Stop colliding with mobs, this mimics not having enough velocity to do damage
+            // after impacting the first object.
+            // For realism this should actually be changed when the velocity of the object is less than a threshold.
+            // This would allow ricochets off walls, and weird gravity effects from slowing the object.
+            if (!Owner.Deleted && Owner.TryGetComponent(out IPhysicsComponent body) && body.PhysicsShapes.Count >= 1)
+            {
+                _shouldCollide = false;
+            }
+        }
+
+        private void StopThrow()
+        {
+            if (Deleted)
+            {
+                return;
+            }
+
+            if (Owner.TryGetComponent(out IPhysicsComponent body) && body.PhysicsShapes.Count >= 1)
+            {
+                body.PhysicsShapes[0].CollisionMask &= (int) ~CollisionGroup.ThrownItem;
+
+                if (body.TryGetController(out ThrownController controller))
+                {
+                    controller.LinearVelocity = Vector2.Zero;
+                }
+
+                body.Status = BodyStatus.OnGround;
+
+                Owner.RemoveComponent<ThrownItemComponent>();
+                EntitySystem.Get<InteractionSystem>().LandInteraction(User, Owner, Owner.Transform.Coordinates);
+            }
+        }
+
+        void ICollideBehavior.PostCollide(int collideCount)
+        {
+            if (_shouldStop && collideCount > 0)
+            {
+                StopThrow();
+            }
+        }
+
+        public void StartThrow(Vector2 direction, float speed)
+        {
+            var comp = Owner.GetComponent<IPhysicsComponent>();
+            comp.Status = BodyStatus.InAir;
+
+            var controller = comp.EnsureController<ThrownController>();
+            controller.Push(direction, speed);
+
+            EntitySystem.Get<AudioSystem>()
+                .PlayFromEntity("/Audio/Effects/toss.ogg", Owner);
+
+            StartStopTimer();
+        }
+
+        private void StartStopTimer()
+        {
+            Owner.SpawnTimer((int) (DefaultThrowTime * 1000), MaybeStopThrow);
+        }
+
+        private void MaybeStopThrow()
+        {
+            if (Deleted)
+            {
+                return;
+            }
+
+            if (IoCManager.Resolve<IPhysicsManager>().IsWeightless(Owner.Transform.Coordinates))
+            {
+                StartStopTimer();
+                return;
+            }
+
+            StopThrow();
+        }
+    }
+}