ECS random sprotes (#6355)

Content.Server/Sprite/RandomSpriteSystem.cs

@@ -0,0 +1,48 @@
+using Content.Server.Sprite.Components;
+using Content.Shared.Random.Helpers;
+using Robust.Server.GameObjects;
+using Robust.Shared.GameObjects;
+using Robust.Shared.IoC;
+using Robust.Shared.Random;
+
+namespace Content.Server.Sprite;
+
+public sealed class RandomSpriteSystem: EntitySystem
+{
+    [Dependency] private readonly IRobustRandom _random = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+        SubscribeLocalEvent<RandomSpriteColorComponent, ComponentStartup>(OnSpriteColorStartup);
+        SubscribeLocalEvent<RandomSpriteColorComponent, MapInitEvent>(OnSpriteColorMapInit);
+
+        SubscribeLocalEvent<RandomSpriteStateComponent, MapInitEvent>(OnSpriteStateMapInit);
+    }
+
+    private void OnSpriteColorStartup(EntityUid uid, RandomSpriteColorComponent component, ComponentStartup args)
+    {
+        UpdateColor(component);
+    }
+
+    private void OnSpriteColorMapInit(EntityUid uid, RandomSpriteColorComponent component, MapInitEvent args)
+    {
+        component.SelectedColor = _random.Pick(component.Colors.Keys);
+        UpdateColor(component);
+    }
+
+    private void OnSpriteStateMapInit(EntityUid uid, RandomSpriteStateComponent component, MapInitEvent args)
+    {
+        if (component.SpriteStates == null) return;
+        if (!TryComp<SpriteComponent>(uid, out var spriteComponent)) return;
+        spriteComponent.LayerSetState(component.SpriteLayer, _random.Pick(component.SpriteStates));
+    }
+
+    private void UpdateColor(RandomSpriteColorComponent component)
+    {
+        if (!TryComp<SpriteComponent>(component.Owner, out var spriteComponent) || component.SelectedColor == null) return;
+
+        spriteComponent.LayerSetState(0, component.BaseState);
+        spriteComponent.LayerSetColor(0, component.Colors[component.SelectedColor]);
+    }
+}