Updated ItemService to use reflection.

- Now creates a new instance of the item instead of returning the same one.
- Grabs all implementations of the item class dynamically at start.

MrBigsock/Assets/Code/Services/ItemService.cs

@@ -2,6 +2,8 @@ using System.Collections;
 using System;
 using System.Linq;
 using System.Collections.Generic;
+using System.Reflection;
+
 using UnityEngine;
 using UnityEngine.InputSystem;
 
@@ -13,20 +15,36 @@ namespace BigSock.Service {
 	/*
 		Service for handling items.
 	*/
-	public class ItemService {	
+	public partial class ItemService {	
 		/*
 			The instance to use.
 		*/
 		public static readonly ItemService SINGLETON = new ItemService();
 
+		/*
+			Get an instance of the item of the given id.
+		*/
+		public IItem Get(ulong id) {
+			if(_items.TryGetValue(id, out var res)) return _new(res);
+			return null;
+		}
 
+		/*
+			Get a random item from the item pool.
+		*/
+		public IItem GetRandom() {
+			var num = _rnd.Next(_itemList.Count);
+			return _new(_itemList[num]);
+		}
+
+	}
+
+	public partial class ItemService {	
 		private Dictionary<ulong, IItem> _items = new Dictionary<ulong, IItem>();
 		private List<IItem> _itemList = new List<IItem>();
 
-
 		private System.Random _rnd = new System.Random();
 
-
 		private ItemService() {
 			_loadItems();
 		}
@@ -34,39 +52,32 @@ namespace BigSock.Service {
 		/*
 			Load the items into the dictionary.
 				(Hard-coded for now, use reflection later)
+			Reflection code: https://stackoverflow.com/a/6944605
 		*/
 		private void _loadItems() {
-			_items = new Dictionary<ulong, IItem>{
-				{ 101, new ItemRunningShoes() },
-				{ 201, new ItemFourEyes() },
-				{ 102, new ItemLunch() },
-				{ 103, new ItemCoffee() },
-			};
-
-			_itemList = _items.Values.ToList();
-		}
+			// Get the classs that inherit the item base class.
+			var types = Assembly
+				.GetAssembly(typeof(ItemBase))
+				.GetTypes()
+				.Where(myType => myType.IsClass 
+					&& !myType.IsAbstract 
+					&& myType.IsSubclassOf(typeof(ItemBase)));
 
-		/*
-			Creates a new instance of the object.
-		*/
-		//private T _new<T>(T obj) where T : IItem, new() { return new T(); }
-		private T _new<T>(T obj) where T : IItem { return obj; }
+			// Create list of instances.
+			_itemList = types
+				.Select(t => (IItem) Activator.CreateInstance(t, new object[0]))
+				.ToList();
 
-		/*
-			Get an instance of the item of the given id.
-		*/
-		public IItem Get(ulong id) {
-			if(_items.TryGetValue(id, out var res)) return _new(res);
-			return null;
+			// Map to a dictionary by their ids.
+			_items = _itemList
+				.ToDictionary(t => t.Id);
 		}
 
 		/*
-			Get a random item from the item pool.
+			Creates a new instance of the object.
 		*/
-		public IItem GetRandom() {
-			var num = _rnd.Next(_itemList.Count);
-			return _new(_itemList[num]);
-		}
-
+		private IItem _new(IItem obj) 
+			=> (IItem) Activator.CreateInstance(obj.GetType(), new object[0]);
+		
 	}
 }
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