OldThink/Content.Server/Sprite/RandomSpriteSystem.cs

using System.Linq;
using Content.Shared.Decals;
using Content.Shared.Sprite;
using Robust.Shared.GameStates;
using Robust.Shared.Prototypes;
using Robust.Shared.Random;

namespace Content.Server.Sprite;

public sealed class RandomSpriteSystem: SharedRandomSpriteSystem
{
    [Dependency] private readonly IPrototypeManager _prototype = default!;
    [Dependency] private readonly IRobustRandom _random = default!;

    public override void Initialize()
    {
        base.Initialize();
        SubscribeLocalEvent<RandomSpriteComponent, ComponentGetState>(OnGetState);
        SubscribeLocalEvent<RandomSpriteComponent, MapInitEvent>(OnMapInit);
    }

    private void OnMapInit(EntityUid uid, RandomSpriteComponent component, MapInitEvent args)
    {
        if (component.Selected.Count > 0)
            return;

        if (component.Available.Count == 0)
            return;

        var group = _random.Pick(component.Available);
        component.Selected.EnsureCapacity(group.Count);

        foreach (var layer in group)
        {
            Color? color = null;

            if (!string.IsNullOrEmpty(layer.Value.Color))
                color = _random.Pick(_prototype.Index<ColorPalettePrototype>(layer.Value.Color).Colors.Values);

            component.Selected.Add(layer.Key, (layer.Value.State, color));
        }

        Dirty(component);
    }

    private void OnGetState(EntityUid uid, RandomSpriteComponent component, ref ComponentGetState args)
    {
        args.State = new RandomSpriteColorComponentState()
        {
            Selected = component.Selected,
        };
    }
}