Power Rework (#863)

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

Content.Server/GameObjects/Components/NodeContainer/NodeGroups/NodeGroupFactory.cs

@@ -0,0 +1,65 @@
+using Robust.Shared.Interfaces.Reflection;
+using Robust.Shared.IoC;
+using System;
+using System.Collections.Generic;
+using System.Reflection;
+
+namespace Content.Server.GameObjects.Components.NodeContainer.NodeGroups
+{
+    public interface INodeGroupFactory
+    {
+        /// <summary>
+        ///     Performs reflection to associate <see cref="INodeGroup"/> implementations with the
+        ///     string specified in their <see cref="NodeGroupAttribute"/>.
+        /// </summary>
+        void Initialize();
+
+        /// <summary>
+        ///     Returns a new <see cref="INodeGroup"/> instance.
+        /// </summary>
+        INodeGroup MakeNodeGroup(NodeGroupID nodeGroupType);
+    }
+
+    public class NodeGroupFactory : INodeGroupFactory
+    {
+        private readonly Dictionary<NodeGroupID, Type> _groupTypes = new Dictionary<NodeGroupID, Type>();
+
+#pragma warning disable 649
+        [Dependency] private readonly IReflectionManager _reflectionManager;
+        [Dependency] private readonly IDynamicTypeFactory _typeFactory;
+#pragma warning restore 649
+
+        public void Initialize()
+        {
+            var nodeGroupTypes = _reflectionManager.GetAllChildren<BaseNodeGroup>();
+            foreach (var nodeGroupType in nodeGroupTypes)
+            {
+                var att = nodeGroupType.GetCustomAttribute<NodeGroupAttribute>();
+                if (att != null)
+                {
+                    foreach (var groupID in att.NodeGroupIDs)
+                    {
+                        _groupTypes.Add(groupID, nodeGroupType);
+                    }
+                }
+            }
+        }
+
+        public INodeGroup MakeNodeGroup(NodeGroupID nodeGroupType)
+        {
+            if (_groupTypes.TryGetValue(nodeGroupType, out var type))
+            {
+                return _typeFactory.CreateInstance<INodeGroup>(type);
+            }
+            throw new ArgumentException($"{nodeGroupType} did not have an associated {nameof(INodeGroup)}.");
+        }
+    }
+
+    public enum NodeGroupID
+    {
+        Default,
+        HVPower,
+        MVPower,
+        Apc,
+    }
+}