Cleanup flashbangs. Fixes #1305

Content.Server/GameObjects/Components/Weapon/FlashableComponent.cs

@@ -0,0 +1,53 @@
+using System;
+using System.Linq;
+using Content.Server.Utility;
+using Content.Shared.GameObjects.Components.Weapons;
+using Content.Shared.GameObjects.EntitySystems;
+using Content.Shared.Physics;
+using Robust.Server.GameObjects.EntitySystems;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Interfaces.GameObjects;
+using Robust.Shared.Interfaces.Physics;
+using Robust.Shared.Interfaces.Timing;
+using Robust.Shared.IoC;
+using Robust.Shared.Maths;
+
+namespace Content.Server.GameObjects.Components.Weapon
+{
+    [RegisterComponent]
+    public sealed class FlashableComponent : SharedFlashableComponent
+    {
+        private double _duration;
+        private TimeSpan _lastFlash;
+
+        public void Flash(double duration)
+        {
+            var timing = IoCManager.Resolve<IGameTiming>();
+            _lastFlash = timing.CurTime;
+            _duration = duration;
+            Dirty();
+        }
+
+        public override ComponentState GetComponentState()
+        {
+            return new FlashComponentState(_duration, _lastFlash);
+        }
+
+        public static void FlashAreaHelper(IEntity source, float range, float duration, string sound = null)
+        {
+            foreach (var entity in IoCManager.Resolve<IEntityManager>().GetEntitiesInRange(source.Transform.GridPosition, range))
+            {
+                if (!InteractionChecks.InRangeUnobstructed(source, entity.Transform.MapPosition, range, ignoredEnt:entity))
+                    continue;
+
+                if(entity.TryGetComponent(out FlashableComponent flashable))
+                    flashable.Flash(duration);
+            }
+
+            if (!string.IsNullOrEmpty(sound))
+            {
+                IoCManager.Resolve<IEntitySystemManager>().GetEntitySystem<AudioSystem>().PlayAtCoords(sound, source.Transform.GridPosition);
+            }
+        }
+    }
+}