tbd-station-14/Content.Client/Overlays/ShowHungerIconsSystem.cs

using Content.Shared.Nutrition.Components;
using Content.Shared.Overlays;
using Content.Shared.StatusIcon;
using Content.Shared.StatusIcon.Components;
using Robust.Shared.Prototypes;

namespace Content.Client.Overlays;

public sealed class ShowHungerIconsSystem : EquipmentHudSystem<ShowHungerIconsComponent>
{
    [Dependency] private readonly IPrototypeManager _prototypeMan = default!;

    public override void Initialize()
    {
        base.Initialize();

        SubscribeLocalEvent<HungerComponent, GetStatusIconsEvent>(OnGetStatusIconsEvent);
    }

    private void OnGetStatusIconsEvent(EntityUid uid, HungerComponent hungerComponent, ref GetStatusIconsEvent args)
    {
        if (!IsActive || args.InContainer)
            return;

        var healthIcons = DecideHungerIcon(uid, hungerComponent);

        args.StatusIcons.AddRange(healthIcons);
    }

    private IReadOnlyList<StatusIconPrototype> DecideHungerIcon(EntityUid uid, HungerComponent hungerComponent)
    {
        var result = new List<StatusIconPrototype>();

        switch (hungerComponent.CurrentThreshold)
        {
            case HungerThreshold.Overfed:
                if (_prototypeMan.TryIndex<StatusIconPrototype>("HungerIconOverfed", out var overfed))
                {
                    result.Add(overfed);
                }
                break;
            case HungerThreshold.Peckish:
                if (_prototypeMan.TryIndex<StatusIconPrototype>("HungerIconPeckish", out var peckish))
                {
                    result.Add(peckish);
                }
                break;
            case HungerThreshold.Starving:
                if (_prototypeMan.TryIndex<StatusIconPrototype>("HungerIconStarving", out var starving))
                {
                    result.Add(starving);
                }
                break;
        }

        return result;
    }
}