Add power sinks (#8020)

Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Server/PowerSink/PowerSinkSystem.cs

@@ -0,0 +1,56 @@
+using Content.Server.Explosion.EntitySystems;
+using Content.Server.Power.Components;
+using Content.Shared.Body.Events;
+using Content.Shared.Examine;
+using Robust.Shared.Utility;
+
+namespace Content.Server.PowerSink
+{
+    public sealed class PowerSinkSystem : EntitySystem
+    {
+        [Dependency] private readonly ExplosionSystem _explosionSystem = default!;
+
+        public override void Initialize()
+        {
+            base.Initialize();
+
+            SubscribeLocalEvent<PowerSinkComponent, ExaminedEvent>(OnExamine);
+        }
+
+        private void OnExamine(EntityUid uid, PowerSinkComponent component, ExaminedEvent args)
+        {
+            if (!args.IsInDetailsRange || !TryComp<PowerConsumerComponent>(uid, out var consumer))
+                return;
+
+            var drainAmount = (int) consumer.NetworkLoad.ReceivingPower / 1000;
+            args.PushMarkup(
+                Loc.GetString(
+                    "powersink-examine-drain-amount",
+                    ("amount", drainAmount),
+                    ("markupDrainColor", "orange"))
+            );
+        }
+
+        public override void Update(float frameTime)
+        {
+            var toRemove = new RemQueue<(PowerSinkComponent Sink, BatteryComponent Battery)>();
+
+            // Realistically it's gonna be like <5 per station.
+            foreach (var (comp, networkLoad, battery, xform) in EntityManager.EntityQuery<PowerSinkComponent, PowerConsumerComponent, BatteryComponent, TransformComponent>())
+            {
+                if (!xform.Anchored) continue;
+
+                battery.CurrentCharge += networkLoad.NetworkLoad.ReceivingPower / 1000;
+                if (battery.CurrentCharge < battery.MaxCharge) continue;
+
+                toRemove.Add((comp, battery));
+            }
+
+            foreach (var (comp, battery) in toRemove)
+            {
+                _explosionSystem.QueueExplosion(comp.Owner, "Default", 5 * (battery.MaxCharge / 2500000), 0.5f, 10, canCreateVacuum: false);
+                EntityManager.RemoveComponent(comp.Owner, comp);
+            }
+        }
+    }
+}