Added AbilityService.

- Handles Abilities and controlling them.

MrBigsock/Assets/Code/Services/AbilityService.cs

+using System.Collections;
+using System;
+using System.Linq;
+using System.Collections.Generic;
+using System.Reflection;
+
+using UnityEngine;
+using UnityEngine.InputSystem;
+
+using BigSock.Item;
+
+
+namespace BigSock.Service {
+	
+	/*
+		Service for handling abilities.
+	*/
+	public partial class AbilityService {	
+		/*
+			The instance to use.
+		*/
+		public static readonly AbilityService SINGLETON = new AbilityService();
+
+		/*
+			Get an instance of the ability of the given id.
+		*/
+		public IAbility Get(ulong id) {
+			if(_abilities.TryGetValue(id, out var res)) return _new(res);
+			return null;
+		}
+
+		/*
+			Get a random ability from the ability pool.
+		*/
+		public IAbility GetRandom() {
+			var num = _rnd.Next(_abilityList.Count);
+			return _new(_abilityList[num]);
+		}
+	}
+
+	public partial class AbilityService {	
+		private Dictionary<ulong, IAbility> _abilities = new Dictionary<ulong, IAbility>();
+		private List<IAbility> _abilityList = new List<IAbility>();
+
+		private System.Random _rnd = new System.Random();
+
+		private AbilityService() {
+			_loadItems();
+		}
+
+		/*
+			Load the abilities into the dictionary.
+			Reflection code: https://stackoverflow.com/a/6944605
+		*/
+		private void _loadItems() {
+			// Get the classs that inherit the item base class.
+			var types = Assembly
+				.GetAssembly(typeof(BaseAbility))
+				.GetTypes()
+				.Where(myType => myType.IsClass 
+					&& !myType.IsAbstract 
+					&& myType.IsSubclassOf(typeof(BaseAbility)));
+
+			// Create list of instances.
+			_abilityList = types
+				.Select(t => (IAbility) Activator.CreateInstance(t, new object[0]))
+				.ToList();
+
+			// Map to a dictionary by their ids.
+			_abilities = _abilityList
+				.ToDictionary(t => t.Id);
+
+			foreach(var a in _abilityList) {
+				Debug.Log($"[AbilityService._loadItems()] {a.Id}");
+			}
+		}
+
+		/*
+			Creates a new instance of the object.
+		*/
+		private IAbility _new(IAbility obj) 
+			=> (IAbility) Activator.CreateInstance(obj.GetType(), new object[0]);
+		
+	}
+}
\ No newline at end of file

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