civ14/Content.Server/Tiles/RequiresTileSystem.cs

using Content.Shared.Tiles;
using Robust.Shared.Map.Components;
using Robust.Shared.Map.Enumerators;

namespace Content.Server.Tiles;

public sealed class RequiresTileSystem : EntitySystem
{
    /*
     * Needs to be on server as client can't predict QueueDel.
     */

    [Dependency] private readonly SharedMapSystem _maps = default!;

    private EntityQuery<RequiresTileComponent> _tilesQuery;

    public override void Initialize()
    {
        base.Initialize();
        _tilesQuery = GetEntityQuery<RequiresTileComponent>();
        SubscribeLocalEvent<TileChangedEvent>(OnTileChange);
    }

    private void OnTileChange(ref TileChangedEvent ev)
    {
        if (!TryComp<MapGridComponent>(ev.Entity, out var grid))
            return;

        var anchored = _maps.GetAnchoredEntitiesEnumerator(ev.Entity, grid, ev.NewTile.GridIndices);
        if (anchored.Equals(AnchoredEntitiesEnumerator.Empty))
            return;

        while (anchored.MoveNext(out var ent))
        {
            if (!_tilesQuery.HasComponent(ent.Value))
                continue;

            QueueDel(ent.Value);
        }
    }
}