tbd-station-14/Content.Server/Anomaly/Effects/AnomalyCoreSystem.cs

using Content.Server.Anomaly.Components;
using Content.Server.Cargo.Systems;
using Content.Shared.Anomaly;
using Robust.Shared.Timing;

namespace Content.Server.Anomaly.Effects;

/// <summary>
/// This component reduces the value of the entity during decay
/// </summary>
public sealed class AnomalyCoreSystem : EntitySystem
{
    [Dependency] private readonly SharedAppearanceSystem _appearance = default!;
    [Dependency] private readonly IGameTiming _gameTiming = default!;

    public override void Initialize()
    {
        SubscribeLocalEvent<AnomalyCoreComponent, MapInitEvent>(OnMapInit);
        SubscribeLocalEvent<AnomalyCoreComponent, PriceCalculationEvent>(OnGetPrice);
    }

    private void OnMapInit(Entity<AnomalyCoreComponent> core, ref MapInitEvent args)
    {
        core.Comp.DecayMoment = _gameTiming.CurTime + TimeSpan.FromSeconds(core.Comp.TimeToDecay);
    }

    public override void Update(float frameTime)
    {
        base.Update(frameTime);

        var query = EntityQueryEnumerator<AnomalyCoreComponent>();
        while (query.MoveNext(out var uid, out var component))
        {
            if (component.IsDecayed)
                continue;

            //When time runs out, we completely decompose
            if (component.DecayMoment < _gameTiming.CurTime)
                Decay(uid, component);
        }
    }
    private void OnGetPrice(Entity<AnomalyCoreComponent> core, ref PriceCalculationEvent args)
    {
        var timeLeft = core.Comp.DecayMoment - _gameTiming.CurTime;
        var lerp = (double) (timeLeft.TotalSeconds / core.Comp.TimeToDecay);
        lerp = Math.Clamp(lerp, 0, 1);

        args.Price = MathHelper.Lerp(core.Comp.EndPrice, core.Comp.StartPrice, lerp);
    }

    private void Decay(EntityUid uid, AnomalyCoreComponent component)
    {
        _appearance.SetData(uid, AnomalyCoreVisuals.Decaying, false);
        component.IsDecayed = true;
    }
}