New items system.

- Items class hierarchy.
- Inventory class.
- CharacterStats class.
- Applies modifiers to character's stats.

MrBigsock/Assets/Code/Character.cs

@@ -3,6 +3,7 @@ using System;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.InputSystem;
+using BigSock.Item;
 
 namespace BigSock {
 	// Common class for all characters.
@@ -11,7 +12,7 @@ namespace BigSock {
 		/*
 			Attack speed of the character.
 		*/
-		public float AttackSpeed => baseAttackSpeed;
+		public float AttackSpeed => Stats.AttackSpeed;
 		public float baseAttackSpeed = 1;
 
 		/*
@@ -22,20 +23,20 @@ namespace BigSock {
 		/*
 			Movement speed of the character.
 		*/
-		public float MovementSpeed => baseMovementSpeed;
+		public float MovementSpeed => Stats.MoveSpeed;
 		public float baseMovementSpeed = 1;
 
 		
 		/*
 			Damage of the character.
 		*/
-		public float Damage => baseDamage;
+		public float Damage => Stats.Damage;
 		public float baseDamage = 1;
 
 		/*
 			Knockback force
 		*/
-		public float KnockbackForce => knockbackForce;
+		public float KnockbackForce => Stats.Knockback;
 		public float knockbackForce = 150;
 
 		
@@ -52,7 +53,7 @@ namespace BigSock {
 		/*
 			Maximum hit points of the character.
 		*/
-		public float MaxHP => baseMaxHP;
+		public float MaxHP => Stats.MaxHP;
 		public float baseMaxHP = 10;
 
 
@@ -81,8 +82,58 @@ namespace BigSock {
 		protected Rigidbody2D rb;
 
 
-		void Start() {
-				rb = GetComponent<Rigidbody2D>();
+		/*
+			The inventory of the character.
+		*/
+		public Inventory Inventory { get; protected set; } = new Inventory();
+
+		/*
+			The base stats of the character.
+		*/
+		public ICharacterStats BaseStats { get; protected set; } = new CharacterStats();
+
+		/*
+			The final stats of the character after applying modifiers.
+		*/
+		public ICharacterStats Stats { get; protected set; } = new CharacterStats();
+
+
+
+		protected virtual void Start() {
+			rb = GetComponent<Rigidbody2D>();
+
+			// Set the base stats.
+			BaseStats = new CharacterStats {
+				MaxHP = baseMaxHP,
+				Damage = baseDamage,
+				MoveSpeed = baseMovementSpeed,
+				Knockback = knockbackForce,
+				Range = 1,
+				AttackSpeed = baseAttackSpeed,
+			};
+			UpdateModifiers();
+
+		}
+
+		/*
+			Updates the modifiers to the character's stats.
+		*/
+		public void UpdateModifiers(ICharacterStats modifiers = null) {
+			modifiers ??= Inventory.Modifier;
+			Stats = BaseStats.Modify(modifiers);
+		}
+
+		/*
+			Try to pick up an item.
+		*/
+		public bool TryPickUpItem(IItem item) {
+			if(Inventory.AddItem(item)) {
+				UpdateModifiers();
+				print($"[Character.TryPickUpItem()] {item.Name} picked up. ({Inventory.Items.Count}/{Inventory.Cap})");
+				return true;
+			}
+			print($"[Character.TryPickUpItem()] {item.Name} NOT picked up. ({Inventory.Items.Count}/{Inventory.Cap})");
+			return false;
 		}
 
 		/*

MrBigsock/Assets/Code/Core/CharacterStats.cs

+using System.Collections;
+using System;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.InputSystem;
+
+
+namespace BigSock {
+
+	/*
+		class represents the stats of a character.
+	*/
+	public class CharacterStats : ICharacterStats {
+		/*
+			The hp of the character.
+		*/
+		public float MaxHP { get; set; }
+
+		/*
+			The damage of the character.
+		*/
+		public float Damage { get; set; }
+
+		/*
+			The movement speed of the character.
+		*/
+		public float MoveSpeed { get; set; }
+
+		/*
+			The knockback of the character.
+		*/
+		public float Knockback { get; set; }
+
+		/*
+			The range of the character.
+		*/
+		public float Range { get; set; }
+
+		/*
+			The attack speed of the character.
+		*/
+		public float AttackSpeed { get; set; }
+
+	}
+}
\ No newline at end of file

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MrBigsock/Assets/Code/Core/ICharacterStats.cs

+using System.Collections;
+using System;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.InputSystem;
+
+
+namespace BigSock {
+
+	/*
+		Interface represents the stats of a character.
+	*/
+	public interface ICharacterStats {
+		/*
+			The hp of the character.
+		*/
+		float MaxHP { get; }
+
+		/*
+			The damage of the character.
+		*/
+		float Damage { get; }
+
+		/*
+			The movement speed of the character.
+		*/
+		float MoveSpeed { get; }
+
+		/*
+			The knockback of the character.
+		*/
+		float Knockback { get; }
+
+		/*
+			The range of the character.
+		*/
+		float Range { get; }
+
+		/*
+			The attack speed of the character.
+		*/
+		float AttackSpeed { get; }
+
+	}
+
+	/*
+		Holds extension methods for character stat objects.
+	*/
+	public static class CharacterStatsExtension {
+		/*
+			Identity object for character stats.
+		*/
+		public static readonly ICharacterStats IDENTITY = new CharacterStats{
+			MaxHP = 1,
+			Damage = 1,
+			MoveSpeed = 1,
+			Knockback = 1,
+			Range = 1,
+			AttackSpeed = 1,
+		};
+
+		/*
+			Adds the values of 2 character stats together.
+		*/
+		public static ICharacterStats Add(this ICharacterStats a, ICharacterStats b) {
+			return new CharacterStats{
+				MaxHP = a.MaxHP + b.MaxHP,
+				Damage = a.Damage + b.Damage,
+				MoveSpeed = a.MoveSpeed + b.MoveSpeed,
+				Knockback = a.Knockback + b.Knockback,
+				Range = a.Range + b.Range,
+				AttackSpeed = a.AttackSpeed + b.AttackSpeed,
+			};
+		}
+
+		/*
+			Multiplies the values of 2 character stats together.
+		*/
+		public static ICharacterStats Multiply(this ICharacterStats a, ICharacterStats b) {
+			return new CharacterStats{
+				MaxHP = a.MaxHP * b.MaxHP,
+				Damage = a.Damage * b.Damage,
+				MoveSpeed = a.MoveSpeed * b.MoveSpeed,
+				Knockback = a.Knockback * b.Knockback,
+				Range = a.Range * b.Range,
+				AttackSpeed = a.AttackSpeed * b.AttackSpeed,
+			};
+		}
+
+		
+		/*
+			Modifies the first stat object by the second one.
+			Ex.: if the second is 20% hp, the result will be the first one, but with 20% more hp.
+		*/
+		public static ICharacterStats Modify(this ICharacterStats a, ICharacterStats b) {
+			return a.Multiply(b.Add(IDENTITY));
+		}
+
+	}
+}
\ No newline at end of file

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MrBigsock/Assets/Code/Item/Base/ConditionalItemBase.cs

+using System.Collections;
+using System;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.InputSystem;
+
+
+namespace BigSock.Item {
+
+	/*
+		A class that represents an item that an effect when a condition is meet.
+	*/
+	public abstract class ConditionalItemBase : ItemBase {
+		/*
+			The type of trigger this item uses.
+		*/
+		public TriggerType Trigger { get; set; }
+
+		/*
+			The handler to activate when the condition is triggered.
+		*/
+		public Action<ICharEventParams> Handler { get; set; }
+
+	}
+} 
\ No newline at end of file

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MrBigsock/Assets/Code/Item/Base/IItem.cs

+using System.Collections;
+using System;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.InputSystem;
+
+
+namespace BigSock.Item {
+
+	/*
+		An interface representing a generic item.
+	*/
+	public interface IItem {
+		/*
+			The name of the item.
+		*/
+		string Name { get; }
+
+		/*
+			The description of the item.
+		*/
+		string Description { get; }
+
+		/*
+			The id of the item.
+		*/
+		ulong Id { get; }
+
+	}
+}
\ No newline at end of file

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MrBigsock/Assets/Code/Item/Base/ItemBase.cs

+using System.Collections;
+using System;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.InputSystem;
+
+
+namespace BigSock.Item {
+
+	/*
+		A class that represents the root of all items.
+	*/
+	public abstract class ItemBase : IItem {
+		/*
+			The name of the item.
+		*/
+		public string Name { get; protected set; }
+
+		/*
+			The description of the item.
+		*/
+		public string Description { get; protected set; }
+
+		/*
+			The id of the item.
+		*/
+		public ulong Id { get; protected set; }
+
+	}
+}
\ No newline at end of file

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MrBigsock/Assets/Code/Item/Base/PassiveItemBase.cs

+using System.Collections;
+using System;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.InputSystem;
+
+
+namespace BigSock.Item {
+
+	/*
+		A class that represents an item that provides passive stat boosts.
+	*/
+	public abstract class PassiveItemBase : ItemBase {
+		/*
+			The modifier of the item.
+		*/
+		public ICharacterStats Modifier { get; set; }
+
+
+	}
+}
\ No newline at end of file

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MrBigsock/Assets/Code/Item/Base/TriggerType.cs

+using System.Collections;
+using System;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.InputSystem;
+
+
+namespace BigSock.Item {
+
+	/*
+		The type of trigger that activates the item's effect.
+	*/
+	public enum TriggerType {
+		None,
+		OnKill,
+		OnAttack,
+		OnHit,
+		OnDamage,
+	}
+}
\ No newline at end of file

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MrBigsock/Assets/Code/Item/EventParams.meta

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MrBigsock/Assets/Code/Item/EventParams/CharEventParams.cs

+using System.Collections;
+using System;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.InputSystem;
+
+
+namespace BigSock {
+
+	/*
+		Class that represents the parameters of a generic character event.
+	*/
+	public class CharEventParams : ICharEventParams {
+		/*
+			The character that own's the event.
+		*/
+		public Character Source { get; set; }
+
+		/*
+			The character that triggered the event. (If any)
+			ex.: OnKill -> the killed enemy. OnDamage -> Enemy that dealt the damage.
+		*/
+		public Character Target { get; set; }
+
+
+	}
+}
\ No newline at end of file

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