Add FlatStatModifier and PercentStatModifier classes; introduce Stat enum for character attributes

Assets/Scripts/Modifiers/FlatStatModifier.cs

@@ -0,0 +1,69 @@
+using System;
+using Data;
+using Interfaces;
+
+namespace Modifiers
+{
+    [Serializable]
+    public class FlatStatModifier : IStatModifier
+    {
+        public Stat stat;
+        public float value;
+        public string Description => $"{stat} +{value}";
+        
+        public void Apply(CharacterAttributes attributes)
+        {
+            ModifyAttributes(attributes, value);
+        }
+
+        public void Remove(CharacterAttributes attributes)
+        {
+            Apply(attributes, -value);
+        }
+
+        private void Apply(CharacterAttributes attributes, float value)
+        {
+            ModifyAttributes(attributes, value);
+        }
+        
+        private void ModifyAttributes(CharacterAttributes attributes, float value)
+        {
+            switch (stat)
+            {
+                case Stat.Health:
+                    attributes.ModifyHealth(value);
+                    break;
+                case Stat.MaxHealth:
+                    attributes.ModifyMaxHealth(value);
+                    break;
+                case Stat.MoveSpeed:
+                    attributes.ModifyMoveSpeed(value);
+                    break;
+                case Stat.Luck:
+                    attributes.ModifyLuck(value);
+                    break;
+                case Stat.Armor:
+                    attributes.ModifyArmor(value);
+                    break;
+                case Stat.Damage:
+                    attributes.ModifyDamage(value);
+                    break;
+                case Stat.RangedDamage:
+                    attributes.ModifyRangedDamage(value);
+                    break;
+                case Stat.MeleeDamage:
+                    attributes.ModifyMeleeDamage(value);
+                    break;
+                case Stat.AttackRange:
+                    attributes.ModifyAttackRange(value);
+                    break;
+                case Stat.AttackSpeed:
+                    attributes.ModifyAttackSpeed(value);
+                    break;
+                default:
+                    throw new ArgumentOutOfRangeException();
+            }
+        }
+
+    }
+}