crystall-punk-14/Content.Server/GameObjects/Components/Projectiles/ThrownItemComponent.cs

using System.Collections.Generic;
using Content.Server.GameObjects.Components.Projectiles;
using Content.Server.GameObjects.EntitySystems;
using Content.Shared.GameObjects;
using Content.Shared.Physics;
using Robust.Server.GameObjects;
using Robust.Shared.GameObjects;
using Robust.Shared.GameObjects.Components;
using Robust.Shared.Interfaces.GameObjects;
using Robust.Shared.IoC;

namespace Content.Server.GameObjects.Components
{
    [RegisterComponent]
    internal class ThrownItemComponent : ProjectileComponent, ICollideBehavior
    {
#pragma warning disable 649
        [Dependency] private readonly IEntitySystemManager _entitySystemManager;
#pragma warning restore 649

        private bool _shouldCollide = true;

        public override string Name => "ThrownItem";

        /// <summary>
        ///     User who threw the item.
        /// </summary>
        public IEntity User;

        void ICollideBehavior.CollideWith(IEntity entity)
        {
            if (!_shouldCollide) return;
            if (entity.TryGetComponent(out DamageableComponent damage))
            {
                damage.TakeDamage(DamageType.Brute, 10, Owner, User);
            }
            // 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.TryGetComponent(out CollidableComponent body) && body.PhysicsShapes.Count >= 1)
            {
                _shouldCollide = false;
            }
        }

        public void PostCollide(int collideCount)
        {

            if (collideCount > 0 && Owner.TryGetComponent(out CollidableComponent body) && body.PhysicsShapes.Count >= 1)
            {
                body.PhysicsShapes[0].CollisionMask &= (int)~CollisionGroup.MobImpassable;

                // KYS, your job is finished. Trigger ILand as well.
                var physics = Owner.GetComponent<PhysicsComponent>();
                (physics.Controller as ThrowController).StopThrow();
                physics.RemoveController();
                Owner.RemoveComponent<ThrownItemComponent>();
                _entitySystemManager.GetEntitySystem<InteractionSystem>().LandInteraction(User, Owner, Owner.Transform.GridPosition);
            }
        }
    }
}