crystall-punk-14/Content.Server/StationEvents/Events/VentCrittersRule.cs

using Content.Server.GameTicking.Components;
using Content.Server.StationEvents.Components;
using Content.Server.GameTicking.Rules.Components;
using Content.Server.Station.Components;
using Content.Shared.Storage;
using Robust.Shared.Map;
using Robust.Shared.Random;

namespace Content.Server.StationEvents.Events;

public sealed class VentCrittersRule : StationEventSystem<VentCrittersRuleComponent>
{
    /*
     * DO NOT COPY PASTE THIS TO MAKE YOUR MOB EVENT.
     * USE THE PROTOTYPE.
     */

    protected override void Started(EntityUid uid, VentCrittersRuleComponent component, GameRuleComponent gameRule, GameRuleStartedEvent args)
    {
        base.Started(uid, component, gameRule, args);

        if (!TryGetRandomStation(out var station))
        {
            return;
        }

        var locations = EntityQueryEnumerator<VentCritterSpawnLocationComponent, TransformComponent>();
        var validLocations = new List<EntityCoordinates>();
        while (locations.MoveNext(out _, out _, out var transform))
        {
            if (CompOrNull<StationMemberComponent>(transform.GridUid)?.Station == station)
            {
                validLocations.Add(transform.Coordinates);
                foreach (var spawn in EntitySpawnCollection.GetSpawns(component.Entries, RobustRandom))
                {
                    Spawn(spawn, transform.Coordinates);
                }
            }
        }

        if (component.SpecialEntries.Count == 0 || validLocations.Count == 0)
        {
            return;
        }

        // guaranteed spawn
        var specialEntry = RobustRandom.Pick(component.SpecialEntries);
        var specialSpawn = RobustRandom.Pick(validLocations);
        Spawn(specialEntry.PrototypeId, specialSpawn);

        foreach (var location in validLocations)
        {
            foreach (var spawn in EntitySpawnCollection.GetSpawns(component.SpecialEntries, RobustRandom))
            {
                Spawn(spawn, location);
            }
        }
    }
}