space-station-14/Content.Shared/Trigger/Systems/RandomTriggerOnTriggerSystem.cs

using Content.Shared.Random.Helpers;
using Content.Shared.Trigger.Components.Effects;
using Robust.Shared.Prototypes;
using Robust.Shared.Timing;

namespace Content.Shared.Trigger.Systems;

public sealed class RandomTriggerOnTriggerSystem : XOnTriggerSystem<RandomTriggerOnTriggerComponent>
{
    [Dependency] private readonly TriggerSystem _trigger = default!;
    [Dependency] private readonly IPrototypeManager _prototypeManager = default!;
    [Dependency] private readonly IGameTiming _timing = default!;

    protected override void OnTrigger(Entity<RandomTriggerOnTriggerComponent> ent, EntityUid target, ref TriggerEvent args)
    {
        var rand = SharedRandomExtensions.PredictedRandom(_timing, GetNetEntity(ent), GetNetEntity(args.User));
        var keyOut = _prototypeManager.Index(ent.Comp.RandomKeyOut).Pick(rand);

        // Prevent recursive triggers
        if (target == ent.Owner && ent.Comp.KeysIn.Contains(keyOut))
        {
            Log.Warning($"{ToPrettyString(ent)} attempted to recursively trigger itself using RandomTriggerOnTriggerComponent.");
            return;
        }

        _trigger.Trigger(target, args.User, keyOut);
        args.Handled = true;
    }
}