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

Assets/Scripts/Data/CharacterAttributes.cs

@@ -4,6 +4,20 @@ using Sirenix.Serialization;
 
 namespace Data
 {
+    public enum Stat
+    {
+        Health,
+        MaxHealth,
+        MoveSpeed,
+        Luck,
+        Armor,
+        Damage,
+        RangedDamage,
+        MeleeDamage,
+        AttackRange,
+        AttackSpeed
+    }
+    
     [Serializable]
     public class CharacterAttributes
     {

Assets/Scripts/Modifiers.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 6c74671c1ef5489984cf2ed331bd4877
+timeCreated: 1752266781

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();
+            }
+        }
+
+    }
+}

Assets/Scripts/Modifiers/FlatStatModifier.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: a042ddb31fa24a1d9e50e1016922b2bc
+timeCreated: 1752266791

Assets/Scripts/Modifiers/PercentStatModifier.cs

@@ -0,0 +1,57 @@
+using Data;
+using Interfaces;
+
+namespace Modifiers
+{
+    public class PercentStatModifier : IStatModifier
+    {
+        private float lastAppliedAmount;
+
+        public Stat Stat { get; set; }
+        public float Percent { get; set; }
+        public string Description => $"{Stat} +{Percent * 100}%";
+
+        public void Apply(CharacterAttributes attributes)
+        {
+            var baseValue = GetBaseValue<float>(attributes);
+            lastAppliedAmount = baseValue * Percent;
+            
+            var flatModifier = new FlatStatModifier
+            {
+                value = lastAppliedAmount,
+                stat = Stat
+            };
+            
+            flatModifier.Apply(attributes);
+        }
+
+        public void Remove(CharacterAttributes attributes)
+        {
+            var flatModifier = new FlatStatModifier
+            {
+                value = -lastAppliedAmount,
+                stat = Stat
+            };
+            
+            flatModifier.Apply(attributes);
+        }
+
+        private T GetBaseValue<T>(CharacterAttributes attributes)
+        {
+            return Stat switch
+            {
+                Stat.Health => (T)(object)attributes.Health,
+                Stat.MaxHealth => (T)(object)attributes.MaxHealth,
+                Stat.MoveSpeed => (T)(object)attributes.MoveSpeed,
+                Stat.Luck => (T)(object)attributes.Luck,
+                Stat.Armor => (T)(object)attributes.Armor,
+                Stat.Damage => (T)(object)attributes.Damage,
+                Stat.RangedDamage => (T)(object)attributes.RangedDamage,
+                Stat.MeleeDamage => (T)(object)attributes.MeleeDamage,
+                Stat.AttackRange => (T)(object)attributes.AttackRange,
+                Stat.AttackSpeed => (T)(object)attributes.AttackSpeed,
+                _ => throw new System.ArgumentOutOfRangeException()
+            };
+        }
+    }
+}

Assets/Scripts/Modifiers/PercentStatModifier.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: d0a1bf6263e84c8cab3312fec117b3fa
+timeCreated: 1752267326

Assets/Scripts/Systems/CharacterModifierManager.cs

@@ -0,0 +1,29 @@
+using System.Collections.Generic;
+using Data;
+using Interfaces;
+using Sirenix.Serialization;
+using UnityEngine;
+
+namespace Systems
+{
+    public class CharacterModifierManager : MonoBehaviour
+    {
+        [OdinSerialize] private List<IStatModifier> activeModifiers = new();
+        
+        [SerializeField] private Character character;
+        
+        public void EquipItem(IStatModifier modifier)
+        {
+            activeModifiers.Add(modifier);
+            modifier.Apply(character.attributes);
+        }
+        
+        public void UnequipItem(IStatModifier modifier)
+        {
+            if (activeModifiers.Remove(modifier))
+            {
+                modifier.Remove(character.attributes);
+            }
+        }
+    }
+}

Assets/Scripts/Systems/CharacterModifierManager.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 1c860b1e8855495097022a829e769fcc
+timeCreated: 1752267836