Power Rework (#863)

Co-authored-by: py01 <pyronetics01@gmail.com>

Content.Server/GameObjects/Components/Power/PowerNetComponents/BatteryStorageComponent.cs

@@ -0,0 +1,72 @@
+using Robust.Shared.GameObjects;
+using Robust.Shared.Serialization;
+using Robust.Shared.ViewVariables;
+
+namespace Content.Server.GameObjects.Components.Power.PowerNetComponents
+{
+    /// <summary>
+    ///     Takes power via a <see cref="PowerConsumerComponent"/> to charge a <see cref="BatteryComponent"/>.
+    /// </summary>
+    [RegisterComponent]
+    public class BatteryStorageComponent : Component
+    {
+        public override string Name => "BatteryStorage";
+
+        [ViewVariables(VVAccess.ReadWrite)]
+        public int ActiveDrawRate { get => _activeDrawRate; set => SetActiveDrawRate(value); }
+        private int _activeDrawRate;
+
+        [ViewVariables]
+        private BatteryComponent _battery;
+
+        [ViewVariables]
+        public PowerConsumerComponent Consumer { get; private set; }
+
+        public override void ExposeData(ObjectSerializer serializer)
+        {
+            base.ExposeData(serializer);
+            serializer.DataField(ref _activeDrawRate, "activeDrawRate", 100);
+        }
+
+        public override void Initialize()
+        {
+            base.Initialize();
+            _battery = Owner.GetComponent<BatteryComponent>();
+            Consumer = Owner.GetComponent<PowerConsumerComponent>();
+            UpdateDrawRate();
+        }
+
+        public void Update(float frameTime)
+        {
+            //Simplified implementation - If a frame adds more power to a partially full battery than it can hold, the power is lost.
+            _battery.CurrentCharge += Consumer.ReceivedPower * frameTime;
+            UpdateDrawRate();
+        }
+
+        private void UpdateDrawRate()
+        {
+            if (_battery.BatteryState == BatteryState.Full)
+            {
+                SetConsumerDraw(0);
+            }
+            else
+            {
+                SetConsumerDraw(ActiveDrawRate);
+            }
+        }
+
+        private void SetConsumerDraw(int newConsumerDrawRate)
+        {
+            if (Consumer.DrawRate != newConsumerDrawRate)
+            {
+                Consumer.DrawRate = newConsumerDrawRate;
+            }
+        }
+
+        private void SetActiveDrawRate(int newEnabledDrawRate)
+        {
+            _activeDrawRate = newEnabledDrawRate;
+            UpdateDrawRate();
+        }
+    }
+}