apply the final debugging

.gitignore

@@ -0,0 +1 @@
+/Java-Knight/target/

Java-Knight/src/main/java/org/project/Interface/IAttachable.java

@@ -3,6 +3,6 @@ package org.project.Interface;
 import org.project.entity.Entity;
 
 public interface IAttachable {
-    public void AttachTo(Entity entity);
+    public void AttachTo(Entity entity, boolean fromInventory);
-    public void DeattachFrom(Entity entity);
+    public void DeattachFrom(Entity entity, boolean toInventory);
 }

Java-Knight/src/main/java/org/project/Main.java

@@ -1,15 +1,49 @@
 package org.project;
 
-import org.project.location.Location;
+import org.project.constants.appConstants.GameModes;
+import org.project.constants.appConstants.TextColor;
+import org.project.engine.MainEngine;
 
-import java.util.ArrayList;
+import java.util.Scanner;
-import java.util.List;
 
 public class Main {
-    public static void main(String[] args) {
+    static void main(String[] args) {
-        // TODO: ADD LOCATIONS TO YOUR GAME
+        Scanner scanner = new Scanner(System.in);
-        List<Location> locations = new ArrayList<>();
+        boolean endGame = false;
 
-        // TODO: IMPLEMENT GAMEPLAY
+        while (true) {
+
+            System.out.println(TextColor.Cyan + "JAVA KNIGHT" + TextColor.Reset);
+            System.out.println(
+                    """
+                    0 > Single Player
+                    1 > Local Multiplayer
+                    2 > Exit
+                    """
+            );
+
+            GameModes gameMode = null;
+            while (true){
+                int choice = scanner.nextInt();
+
+                if (choice == 0) {
+                    gameMode = GameModes.SINGLE_PLAYER;
+                    break;
+                } else if (choice == 1) {
+                    gameMode = GameModes.MULTI_PLAYER_LOCAL;
+                    break;
+                } else if (choice == 2) {
+                    endGame = true;
+                    break;
+                }
+            }
+
+            if (endGame) {
+                break;
+            }
+
+            MainEngine engine = MainEngine.CreateEngine(gameMode);
+            engine.run();
+        }
     }
 }

Java-Knight/src/main/java/org/project/common/models/EntityDiff.java

@@ -0,0 +1,5 @@
+package org.project.common.models;
+
+public record EntityDiff(int health, int stamina, boolean lostShield, boolean lostCostume, int shieldHealth, int costumeHealth) {
+
+}

Java-Knight/src/main/java/org/project/constants/appConstants/ConsoleColor.java

@@ -1,5 +1,5 @@
 package org.project.constants.appConstants;
 
 public class ConsoleColor {
-    public static final String Reset = "\\u001B[0m";
+    public static final String Reset = "\u001B[0m";
 }

Java-Knight/src/main/java/org/project/constants/appConstants/TextColor.java

@@ -1,12 +1,12 @@
 package org.project.constants.appConstants;
 
 public class TextColor extends ConsoleColor{
-    public static String Black = "\\u001B[30m";
+    public static String Black = "\u001B[30m";
-    public static String Red = "\\u001B[31m";
+    public static String Red = "\u001B[31m";
-    public static String Green = "\\u001B[32m";
+    public static String Green = "\u001B[32m";
-    public static String Yellow = "\\u001B[33m";
+    public static String Yellow = "\u001B[33m";
-    public static String Blue = "\\u001B[34m";
+    public static String Blue = "\u001B[34m";
-    public static String Magenta = "\\u001B[35m";
+    public static String Magenta = "\u001B[35m";
-    public static String Cyan = "\\u001B[36m";
+    public static String Cyan = "\u001B[36m";
-    public static String White = "\\u001B[37m";
+    public static String White = "\u001B[37m";
 }

Java-Knight/src/main/java/org/project/engine/BattleEngine.java

@@ -7,6 +7,10 @@ public abstract class BattleEngine {
     public Entity Player2;
 
     public BattleEngine(Entity player1, Entity player2) {
+        player1.ResetStamina();
+        player1.RestoreHealth();
+        player2.RestoreHealth();
+        player2.ResetStamina();
         Player1 = player1;
         Player2 = player2;
     }

Java-Knight/src/main/java/org/project/engine/MainEngine.java

@@ -26,6 +26,7 @@ public abstract class MainEngine {
         while (true) {
             for (PlayerRoles role : roles) {
                 System.out.println(index + " > " + role.name().toLowerCase());
+                index++;
             }
             int choice = scanner.nextInt();
 
@@ -42,6 +43,7 @@ public abstract class MainEngine {
         while (true) {
             for (PlayerRoles role : roles) {
                 System.out.println(index + " > " + role.name().toLowerCase());
+                index++;
             }
             int choice = scanner.nextInt();
 

Java-Knight/src/main/java/org/project/engine/MultiPlayerBattleEngine.java

@@ -1,15 +1,186 @@
 package org.project.engine;
 
-import org.project.entity.enemies.Enemy;
+import org.project.common.models.EntityDiff;
+import org.project.constants.appConstants.TextColor;
+import org.project.constants.gameConstant.EntityState;
+import org.project.constants.gameConstant.FightMoves;
+import org.project.entity.Entity;
 import org.project.entity.players.Player;
 
+import java.util.ArrayList;
+import java.util.Dictionary;
+import java.util.Hashtable;
+import java.util.Scanner;
+
 public class MultiPlayerBattleEngine extends BattleEngine {
+    private final Player player1;
+    private final Player player2;
+    private Player player1Past;
+    private Player player2Past;
+
     public MultiPlayerBattleEngine(Player player1, Player player2) {
         super(player1, player2);
+        this.player1 = (Player) Player1;
+        this.player2 = (Player) Player2;
+        player1Past = player1.copy();
+        player2Past = player2.copy();
     }
 
     @Override
     public void StartBattle() {
+        EntityDiff playerDiff;
+        EntityDiff enemyDiff;
 
+        while (true) {
+            if (player1.GetState() != EntityState.FROZEN) {
+                FightMoves player1Move = PlayerMovesMenu(player1, player2);
+                showMoveExplanation(player1Move, player1, player2Past);
+
+                playerDiff = getPlayerDiff(player1Past, player1);
+                enemyDiff = getPlayerDiff(player2Past, player2);
+
+                System.out.println();
+                showFighter(playerDiff, player1);
+                showFighter(enemyDiff, player2);
+                System.out.println();
+            }
+
+            if (player1.GetState() == EntityState.DEAD) {
+                System.out.println(TextColor.Green + player2.Name + " WON!" + TextColor.Reset);
+                return;
+            }
+
+            if (player1Past.GetState() == EntityState.FROZEN) {
+                player1.SetState(EntityState.ALIVE);
+            }
+
+            player1Past = player1.copy();
+            player2Past = player2.copy();
+
+
+            if (player2.GetState() != EntityState.FROZEN)
+            {
+                FightMoves player2Move = PlayerMovesMenu(player2, player1);
+                showMoveExplanation(player2Move, player2, player1Past);
+
+                playerDiff = getPlayerDiff(player1Past, player1);
+                enemyDiff = getPlayerDiff(player2Past, player2);
+
+                System.out.println();
+                showFighter(playerDiff, player1);
+                showFighter(enemyDiff, player2);
+                System.out.println();
+            }
+
+            if (player2.GetState() == EntityState.DEAD) {
+                System.out.println(TextColor.Green + player1.Name + " WON!" + TextColor.Reset);
+                return;
+            }
+
+            if (player2Past.GetState() == EntityState.FROZEN) {
+                player2.SetState(EntityState.ALIVE);
+            }
+
+            player1Past = player1.copy();
+            player2Past = player2.copy();
+        }
+    }
+
+    private EntityDiff getPlayerDiff(Entity oldVersion, Entity newVersion) {
+        return new EntityDiff(
+                newVersion.Health - oldVersion.Health,
+                newVersion.GetStamina() - oldVersion.GetStamina(),
+                (newVersion.Shield == null && oldVersion.Shield != null),
+                (newVersion.Weapon == null && oldVersion.Weapon != null),
+                (newVersion.Shield != null ? newVersion.Shield.GetHealth() : 0) - (oldVersion.Shield != null ? oldVersion.Shield.GetHealth() : 0),
+                (newVersion.Costume != null ? newVersion.Costume.GetHealth() : 0) - (oldVersion.Costume != null ? oldVersion.Costume.GetHealth() : 0)
+        );
+    }
+
+    private void showFighter(EntityDiff diff, Entity entity) {
+        System.out.println(entity.Name + ":");
+
+        String color = diff.health() > 0 ? TextColor.Green : TextColor.Red;
+        String sign = diff.health() > 0 ? "+" : "-";
+        System.out.println("    Health: " + entity.Health + " " + color + sign + Math.abs(diff.health()) + TextColor.Reset);
+
+        color = diff.stamina() > 0 ? TextColor.Green : TextColor.Red;
+        sign = diff.stamina() > 0 ? "+" : "-";
+        System.out.println("    Stamina: " + entity.GetStamina() + " " + color + sign + Math.abs(diff.stamina()) + TextColor.Reset);
+
+        if (diff.lostShield()) {
+            System.out.println("    Shield: " + entity.Shield.getName() + " " + TextColor.Red + "LOST" + TextColor.Reset);
+        }
+
+        if (diff.lostCostume()) {
+            System.out.println("    Costume: " + entity.Costume.getName() + " " + TextColor.Red + "LOST" + TextColor.Reset);
+        }
+
+        if (entity.Shield != null) {
+            color = diff.shieldHealth() > 0 ? TextColor.Green : TextColor.Red;
+            sign = diff.shieldHealth() > 0 ? "+" : "-";
+            System.out.println("    Shield: " + entity.Shield.getName() + " " + color + sign + Math.abs(diff.shieldHealth()) + TextColor.Reset);
+        }
+
+        if (entity.Costume != null) {
+            color = diff.costumeHealth() > 0 ? TextColor.Green : TextColor.Red;
+            sign = diff.costumeHealth() > 0 ? "+" : "-";
+            System.out.println("    Costume: " + entity.Costume.getName() + " " + color + sign + Math.abs(diff.shieldHealth()) + TextColor.Reset);
+        }
+    }
+
+    private FightMoves PlayerMovesMenu(Player performer, Player receiver) {
+        Scanner scanner = new Scanner(System.in);
+
+        System.out.println(performer.Name + " it's your turn");
+        ArrayList<FightMoves> moves = performer.GetAvailableMoves();
+
+        int index = 0;
+        Dictionary<Integer, FightMoves> dictionary = new Hashtable<>();
+
+        for (FightMoves move : moves) {
+            String result = index + " > " + move.toString();
+
+            if (move == FightMoves.SPECIAL) {
+                result += " (" + performer.GetSpecialAbilityDescription(receiver) + ")";
+            }
+
+            dictionary.put(index, move);
+            index++;
+
+            System.out.println(result);
+        }
+
+        boolean continueLoop;
+        while (true){
+            continueLoop = false;
+            int choice = scanner.nextInt();
+            FightMoves move = moves.get(choice);
+
+            switch (move) {
+                case FightMoves.LIGHT_ATTACK -> performer.LightAttack(receiver);
+                case FightMoves.HEAVY_ATTACK -> performer.HeavyAttack(receiver);
+                case FightMoves.SPECIAL -> performer.SpecialAbility(receiver);
+                case FightMoves.HEAL -> performer.HealMove();
+                case FightMoves.DEFEND -> performer.defend();
+                default -> continueLoop = true;
+            }
+
+            if (!continueLoop) {
+                return move;
+            }
+        }
+    }
+
+    private void showMoveExplanation(FightMoves move, Entity performer, Entity receiver) {
+        System.out.print(TextColor.Cyan);
+        switch (move) {
+            case FightMoves.LIGHT_ATTACK -> System.out.println(performer.Name + " performs a light attack");
+            case FightMoves.HEAVY_ATTACK -> System.out.println(performer.Name + " performs a heavy attack");
+            case FightMoves.SPECIAL -> System.out.println(performer.GetSpecialAbilityResultDescription(receiver));
+            case FightMoves.HEAL -> System.out.println(performer.Name + " heals");
+            case FightMoves.DEFEND -> System.out.println(performer.Name + " get their guard up!");
+        }
+        System.out.print(TextColor.Reset);
     }
 }

Java-Knight/src/main/java/org/project/engine/SinglePlayerBattleEngine.java

@@ -1,55 +1,185 @@
 package org.project.engine;
 
+import org.project.common.models.EntityDiff;
 import org.project.constants.appConstants.TextColor;
 import org.project.constants.gameConstant.EntityState;
 import org.project.constants.gameConstant.FightMoves;
+import org.project.entity.Entity;
 import org.project.entity.enemies.Enemy;
 import org.project.entity.players.Player;
 
+import java.util.ArrayList;
+import java.util.Dictionary;
+import java.util.Hashtable;
+import java.util.Scanner;
+
 public class SinglePlayerBattleEngine extends BattleEngine {
-    private Player player;
+    private final Player player;
-    private Enemy enemy;
+    private final Enemy enemy;
+    private Player playerPast;
+    private Enemy enemyPast;
     public SinglePlayerBattleEngine(Player player, Enemy enemy) {
         super(player, enemy);
-        player = (Player) Player1;
+        this.player = (Player) Player1;
-        enemy = (Enemy) Player2;
+        this.enemy = (Enemy) Player2;
+        playerPast = player.copy();
+        enemyPast = enemy.copy();
     }
 
     @Override
     public void StartBattle() {
-        Player playerPast = player;
+        EntityDiff playerDiff;
-        Enemy enemyPast = enemy;
+        EntityDiff enemyDiff;
 
         while (true) {
-            if (enemyPast.GetState() == EntityState.FROZEN) {
+            if (player.GetState() != EntityState.FROZEN) {
-                enemy.SetState(EntityState.ALIVE);
+                FightMoves playerMove = PlayerMovesMenu();
+                showMoveExplanation(playerMove, player, enemyPast);
+
+                playerDiff = getPlayerDiff(playerPast, player);
+                enemyDiff = getPlayerDiff(enemyPast, enemy);
+
+                System.out.println();
+                showFighter(playerDiff, player);
+                showFighter(enemyDiff, enemy);
+                System.out.println();
             }
+
             if (playerPast.GetState() == EntityState.FROZEN) {
                 player.SetState(EntityState.ALIVE);
             }
 
-            // TODO: get diffs
-
-            // TODO: player round
-
-            // TODO: show players stats
-
-            // TODO: bot move
-            FightMoves botMove = enemy.PlayRound(player);
-            switch (botMove)
-
             if (enemy.GetState() == EntityState.DEAD) {
                 enemy.DropLoot(player);
                 player.AddLevelProgress(enemy.LevelProgressAmount);
                 System.out.println(TextColor.Green + player.Name + " WON!" + TextColor.Reset);
                 return;
             }
-            else if (player.GetState() == EntityState.DEAD) {
+
+            playerPast = player.copy();
+            enemyPast = enemy.copy();
+
+            if (enemy.GetState() != EntityState.FROZEN) {
+                FightMoves botMove = enemy.PlayRound(player);
+                showMoveExplanation(botMove, enemy, playerPast);
+
+                playerDiff = getPlayerDiff(playerPast, player);
+                enemyDiff = getPlayerDiff(enemyPast, enemy);
+
+                System.out.println();
+                showFighter(playerDiff, player);
+                showFighter(enemyDiff, enemy);
+                System.out.println();
+            }
+
+            if (player.GetState() == EntityState.DEAD) {
                 return;
             }
 
-            playerPast = player;
+            if (enemyPast.GetState() == EntityState.FROZEN) {
-            enemyPast = enemy;
+                enemy.SetState(EntityState.ALIVE);
+            }
+
+            playerPast = player.copy();
+            enemyPast = enemy.copy();
         }
     }
+
+    private EntityDiff getPlayerDiff(Entity oldVersion, Entity newVersion) {
+        return new EntityDiff(
+                newVersion.Health - oldVersion.Health,
+                newVersion.GetStamina() - oldVersion.GetStamina(),
+                (newVersion.Shield == null && oldVersion.Shield != null),
+                (newVersion.Weapon == null && oldVersion.Weapon != null),
+                (newVersion.Shield != null ? newVersion.Shield.GetHealth() : 0) - (oldVersion.Shield != null ? oldVersion.Shield.GetHealth() : 0),
+                (newVersion.Costume != null ? newVersion.Costume.GetHealth() : 0) - (oldVersion.Costume != null ? oldVersion.Costume.GetHealth() : 0)
+        );
+    }
+
+    private void showFighter(EntityDiff diff, Entity entity) {
+        System.out.println(entity.Name + ":");
+
+        String color = diff.health() > 0 ? TextColor.Green : TextColor.Red;
+        String sign = diff.health() > 0 ? "+" : "-";
+        System.out.println("    Health: " + entity.Health + " " + color + sign + Math.abs(diff.health()) + TextColor.Reset);
+
+        color = diff.stamina() > 0 ? TextColor.Green : TextColor.Red;
+        sign = diff.stamina() > 0 ? "+" : "-";
+        System.out.println("    Stamina: " + entity.GetStamina() + " " + color + sign + Math.abs(diff.stamina()) + TextColor.Reset);
+
+        if (diff.lostShield()) {
+            System.out.println("    Shield: " + entity.Shield.getName() + " " + TextColor.Red + "LOST" + TextColor.Reset);
+        }
+
+        if (diff.lostCostume()) {
+            System.out.println("    Costume: " + entity.Costume.getName() + " " + TextColor.Red + "LOST" + TextColor.Reset);
+        }
+
+        if (entity.Shield != null) {
+            color = diff.shieldHealth() > 0 ? TextColor.Green : TextColor.Red;
+            sign = diff.shieldHealth() > 0 ? "+" : "-";
+            System.out.println("    Shield: " + entity.Shield.getName() + " " + color + sign + Math.abs(diff.shieldHealth()) + TextColor.Reset);
+        }
+
+        if (entity.Costume != null) {
+            color = diff.costumeHealth() > 0 ? TextColor.Green : TextColor.Red;
+            sign = diff.costumeHealth() > 0 ? "+" : "-";
+            System.out.println("    Costume: " + entity.Costume.getName() + " " + color + sign + Math.abs(diff.shieldHealth()) + TextColor.Reset);
+        }
+    }
+
+    private FightMoves PlayerMovesMenu() {
+        Scanner scanner = new Scanner(System.in);
+
+        System.out.println(player.Name + " it's your turn");
+        ArrayList<FightMoves> moves = player.GetAvailableMoves();
+
+        int index = 0;
+        Dictionary<Integer, FightMoves> dictionary = new Hashtable<>();
+
+        for (FightMoves move : moves) {
+            String result = index + " > " + move.toString();
+
+            if (move == FightMoves.SPECIAL) {
+                result += " (" + player.GetSpecialAbilityDescription(enemy) + ")";
+            }
+
+            dictionary.put(index, move);
+            index++;
+
+            System.out.println(result);
+        }
+
+        boolean continueLoop;
+        while (true){
+            continueLoop = false;
+            int choice = scanner.nextInt();
+            FightMoves move = moves.get(choice);
+
+            switch (move) {
+                case FightMoves.LIGHT_ATTACK -> player.LightAttack(enemy);
+                case FightMoves.HEAVY_ATTACK -> player.HeavyAttack(enemy);
+                case FightMoves.SPECIAL -> player.SpecialAbility(enemy);
+                case FightMoves.HEAL -> player.HealMove();
+                case FightMoves.DEFEND -> player.defend();
+                default -> continueLoop = true;
+            }
+
+            if (!continueLoop) {
+                return move;
+            }
+        }
+    }
+
+    private void showMoveExplanation(FightMoves move, Entity performer, Entity receiver) {
+        System.out.print(TextColor.Cyan);
+        switch (move) {
+            case FightMoves.LIGHT_ATTACK -> System.out.println(performer.Name + " performs a light attack");
+            case FightMoves.HEAVY_ATTACK -> System.out.println(performer.Name + " performs a heavy attack");
+            case FightMoves.SPECIAL -> System.out.println(performer.GetSpecialAbilityResultDescription(receiver));
+            case FightMoves.HEAL -> System.out.println(performer.Name + " heals");
+            case FightMoves.DEFEND -> System.out.println(performer.Name + " get their guard up!");
+        }
+        System.out.print(TextColor.Reset);
+    }
 }

Java-Knight/src/main/java/org/project/engine/SinglePlayerEngine.java

@@ -29,10 +29,10 @@ public class SinglePlayerEngine extends MainEngine {
         System.out.println(TextColor.Cyan + GetIntro() + ConsoleColor.Reset);
         System.out.println();
 
-        System.out.println("How should me call you, hero? ");
+        System.out.println("How should we call you, hero? ");
         String name = scanner.nextLine();
 
-        System.out.println("Greetings, " + name + ". May we know your role? \n");
+        System.out.println("Greetings, " + TextColor.Cyan + name + TextColor.Reset +". May we know your role? \n");
 
         player = RoleMenu(name);
 
@@ -46,7 +46,7 @@ public class SinglePlayerEngine extends MainEngine {
 
             boolean continueLoop = false;
             do {
-                System.out.println(GetLocationIntro(location));
+                System.out.println(TextColor.Cyan + GetLocationIntro(location) + TextColor.Reset);
                 System.out.println("What do you do, " + player.Name + "?");
                 System.out.println(
                         """
@@ -113,7 +113,7 @@ public class SinglePlayerEngine extends MainEngine {
             case Jungle jungle ->
                     player.Name + " enters the woods, after a few steps, they see a green goblin searching for food a few steps away";
             case GraveYard graveYard ->
-                    player.Name + " goes inside the grave ward, they cannot see a more than 10 steps ahead because of the fog in the air. After lurking through out the graves, the shadow appears... It's a skeleton!";
+                    player.Name + " goes inside the grave ward, they cannot see further than 10 steps ahead because of the fog in the air. After lurking through out the graves, the shadow appears... It's a skeleton!";
             case DarkCaves darkCaves ->
                     player.Name + " dives into the darkness. As our hero was going deeper, a black smoke appears, a vampire is nearby...";
             case Castle castle ->
@@ -125,7 +125,7 @@ public class SinglePlayerEngine extends MainEngine {
     public void MarketPlace() {
         Scanner scanner = new Scanner(System.in);
 
-        System.out.println("You've entered the marketplace, what would you like to do?");
+        System.out.println(TextColor.Cyan + "You've entered the marketplace, what would you like to do?" + TextColor.Reset);
         boolean wantsToStay = true;
         while (wantsToStay) {
             System.out.println("Money = " + player.GetMoney() + "\n");
@@ -137,15 +137,21 @@ public class SinglePlayerEngine extends MainEngine {
                     4 > Sell the costumes
                     5 > Sell the Weapons
                     6 > Buy shields
-                    7 > Buy shields
+                    7 > Buy weapon
-                    8 > Buy shields
+                    8 > Buy costume
                     9 > Exit
                     """);
 
             int choice = scanner.nextInt();
 
             switch (choice) {
-                case 0 -> DisplayItem.DisplayItems(player.GetInventory());
+                case 0 -> {
+                    if (player.GetInventory().isEmpty()) {
+                        System.out.println(TextColor.Red + "You do not have anything at the moment" + TextColor.Reset);
+                        break;
+                    }
+                    DisplayItem.DisplayItems(player.GetInventory());
+                }
                 case 1 -> {
                     player.SellByClass(ItemClass.UNNECESSARY);
                     System.out.println(TextColor.Green + "Unnecessary goods sold" + TextColor.Reset);
@@ -171,8 +177,13 @@ public class SinglePlayerEngine extends MainEngine {
 
                     System.out.println(TextColor.Blue + "Current shield: ");
                     ArrayList<Item> item = new ArrayList<>();
-                    item.add(player.Shield);
+                    if (player.Shield == null) {
-                    DisplayItem.DisplayItems(item);
+                        System.out.println(TextColor.Red + "You do not have a Shield" + TextColor.Reset);
+                    }
+                    else {
+                        item.add(player.Shield);
+                        DisplayItem.DisplayItems(item);
+                    }
                     System.out.println(TextColor.Reset);
 
                     ArrayList<Item> items = new ArrayList<>(Arrays.asList(Shields.getShields()));
@@ -185,7 +196,8 @@ public class SinglePlayerEngine extends MainEngine {
 
                     if (accessory != null) {
                         if (player.GetMoney() >= accessory.GetPrice()) {
-                            accessory.AttachTo(player);
+                            if (player.Shield != null) player.Shield.DeattachFrom(player, true);
+                            accessory.AttachTo(player, false);
                             player.ModifyMoney(accessory.GetPrice(), false);
                         }
                         else {
@@ -198,8 +210,13 @@ public class SinglePlayerEngine extends MainEngine {
 
                     System.out.println(TextColor.Blue + "Current weapon: ");
                     ArrayList<Item> item = new ArrayList<>();
-                    item.add(player.Weapon);
+                    if (player.Weapon == null) {
-                    DisplayItem.DisplayItems(item);
+                        System.out.println(TextColor.Red + "You do not have a Weapon" + TextColor.Reset);
+                    }
+                    else {
+                        item.add(player.Weapon);
+                        DisplayItem.DisplayItems(item);
+                    }
                     System.out.println(TextColor.Reset);
 
                     ArrayList<Item> items = new ArrayList<>(Arrays.asList(Weapons.getWeapons()));
@@ -212,7 +229,8 @@ public class SinglePlayerEngine extends MainEngine {
 
                     if (accessory != null) {
                         if (player.GetMoney() >= accessory.GetPrice()) {
-                            accessory.AttachTo(player);
+                            if (player.Weapon != null) player.Weapon.DeattachFrom(player, true);
+                            accessory.AttachTo(player, false);
                             player.ModifyMoney(accessory.GetPrice(), false);
                         }
                         else {
@@ -225,8 +243,13 @@ public class SinglePlayerEngine extends MainEngine {
 
                     System.out.println(TextColor.Blue + "Current costume: ");
                     ArrayList<Item> item = new ArrayList<>();
-                    item.add(player.Costume);
+                    if (player.Costume == null) {
-                    DisplayItem.DisplayItems(item);
+                        System.out.println(TextColor.Red + "You do not have a Costume" + TextColor.Reset);
+                    }
+                    else {
+                        item.add(player.Costume);
+                        DisplayItem.DisplayItems(item);
+                    }
                     System.out.println(TextColor.Reset);
 
                     ArrayList<Item> items = new ArrayList<>(Arrays.asList(Costumes.getCostumes()));
@@ -239,7 +262,8 @@ public class SinglePlayerEngine extends MainEngine {
 
                     if (accessory != null) {
                         if (player.GetMoney() >= accessory.GetPrice()) {
-                            accessory.AttachTo(player);
+                            if (player.Costume != null) player.Costume.DeattachFrom(player, true);
+                            accessory.AttachTo(player, false);
                             player.ModifyMoney(accessory.GetPrice(), false);
                         }
                         else {
@@ -255,7 +279,8 @@ public class SinglePlayerEngine extends MainEngine {
     public void InventoryView() {
         Scanner scanner = new Scanner(System.in);
 
-        System.out.println("You open your inventory, what would you like to do?");
+        System.out.println(TextColor.Cyan + "You open your inventory, what would you like to do?\n" + TextColor.Reset);
+
         boolean wantsToStay = true;
         while (wantsToStay) {
             System.out.println("Money = " + player.GetMoney() + "\n");
@@ -270,10 +295,20 @@ public class SinglePlayerEngine extends MainEngine {
             int choice = scanner.nextInt();
 
             switch (choice) {
-                case 0 -> DisplayItem.DisplayItems(player.GetInventory());
+                case 0 -> {
+                    if (player.GetInventory().isEmpty()) {
+                        System.out.println(TextColor.Red + "You do not have anything at the moment" + TextColor.Reset);
+                        break;
+                    }
+                    DisplayItem.DisplayItems(player.GetInventory());
+                }
                 case 1 -> {
                     System.out.println(TextColor.Blue + "Current shield: ");
                     ArrayList<Item> item = new ArrayList<>();
+                    if (player.Shield == null) {
+                        System.out.println(TextColor.Red + "You do not have a Shield" + TextColor.Reset);
+                        break;
+                    }
                     item.add(player.Shield);
                     DisplayItem.DisplayItems(item);
                     System.out.println(TextColor.Reset);
@@ -285,12 +320,17 @@ public class SinglePlayerEngine extends MainEngine {
                     Item shield = dictionary.get(index);
 
                     if (shield != null) {
-                        ((Accessory) shield).AttachTo(player);
+                        if (player.Shield != null) player.Shield.DeattachFrom(player, true);
+                        ((Accessory) shield).AttachTo(player, true);
                     }
                 }
                 case 2 -> {
                     System.out.println(TextColor.Blue + "Current weapon: ");
                     ArrayList<Item> item = new ArrayList<>();
+                    if (player.Weapon == null) {
+                        System.out.println(TextColor.Red + "You do not have a Weapon" + TextColor.Reset);
+                        break;
+                    }
                     item.add(player.Weapon);
                     DisplayItem.DisplayItems(item);
                     System.out.println(TextColor.Reset);
@@ -302,12 +342,17 @@ public class SinglePlayerEngine extends MainEngine {
                     Item weapon = dictionary.get(index);
 
                     if (weapon != null) {
-                        ((Accessory) weapon).AttachTo(player);
+                        if (player.Weapon != null) player.Weapon.DeattachFrom(player, true);
+                        ((Accessory) weapon).AttachTo(player, true);
                     }
                 }
                 case 3 -> {
                     System.out.println(TextColor.Blue + "Current costume: ");
                     ArrayList<Item> item = new ArrayList<>();
+                    if (player.Costume == null) {
+                        System.out.println(TextColor.Red + "You do not have a Costume" + TextColor.Reset);
+                        break;
+                    }
                     item.add(player.Costume);
                     DisplayItem.DisplayItems(item);
                     System.out.println(TextColor.Reset);
@@ -319,7 +364,8 @@ public class SinglePlayerEngine extends MainEngine {
                     Item costume = dictionary.get(index);
 
                     if (costume != null) {
-                        ((Accessory) costume).AttachTo(player);
+                        if (player.Costume != null) player.Costume.DeattachFrom(player, true);
+                        ((Accessory) costume).AttachTo(player, true);
                     }
                 }
                 case 4 -> wantsToStay = false;

Java-Knight/src/main/java/org/project/entity/Entity.java

@@ -56,6 +56,32 @@ public abstract class Entity implements IDamageable, IHealable, IDefendable, IFi
 
     protected Entity() {}
 
+    public Entity(Entity other) {
+        this.Name = other.Name;
+        this.MaxHealth = other.MaxHealth;
+        this.Health = other.Health;
+        this.Stamina = other.Stamina;
+        this.MaxStamina = other.MaxStamina;
+        this.Money = other.Money;
+        this.BaseDamage = other.BaseDamage;
+        this.State = other.State;
+
+        this.Weapon = other.Weapon == null ? null : new Weapon(other.Weapon.getName(), this, other.Weapon.GetPrice(), other.Weapon.GetHealth(), other.Weapon.GetMaxHealth(), other.Weapon.GetDamage());
+        this.Shield = other.Shield == null ? null : new Shield(other.Shield.getName(), this, other.Shield.GetPrice(), other.Shield.GetHealth(), other.Shield.GetMaxHealth(), other.Shield.GetDefense());
+        this.Costume = other.Costume == null ? null : new Costume(other.Costume.getName(), this, other.Costume.GetPrice(), other.Costume.GetHealth(), other.Costume.GetMaxHealth(), other.Costume.GetDefense());
+
+        this.Inventory = other.Inventory == null ? null : new ArrayList<>(other.Inventory);
+        this.defencePowerUps = other.defencePowerUps == null ? null : new ArrayList<>(other.defencePowerUps);
+
+        this.DefenseBonus = other.DefenseBonus;
+        this.IsDefending = other.IsDefending;
+        this.HealAmount = other.HealAmount;
+        this.HeavyAttackStamina = other.HeavyAttackStamina;
+        this.SpecialAbilityStamina = other.SpecialAbilityStamina;
+    }
+
+    public abstract Entity copy();
+
     public int GetStamina() { return Stamina; }
 
     public void ResetStamina() { Stamina = MaxStamina; }
@@ -68,10 +94,11 @@ public abstract class Entity implements IDamageable, IHealable, IDefendable, IFi
                 Stamina = MaxStamina;
             }
         }
-
+        else {
-        Stamina -= amount;
+            Stamina -= amount;
-        if (Stamina < 0) {
+            if (Stamina < 0) {
-            Stamina = 0;
+                Stamina = 0;
+            }
         }
     }
 
@@ -146,7 +173,7 @@ public abstract class Entity implements IDamageable, IHealable, IDefendable, IFi
 
     @Override
     public void TakeDamage(int amount, AttackPowerUp[] powerUps) {
-        if (!defencePowerUps.contains(DefencePowerUp.INVISIBLE)) return;
+        if (defencePowerUps != null && !defencePowerUps.contains(DefencePowerUp.INVISIBLE)) return;
 
         IDefender[] defenders = GetDefenders();
 

Java-Knight/src/main/java/org/project/entity/enemies/Dragon.java

@@ -26,6 +26,15 @@ public class Dragon extends Enemy {
         this("Dragon", 5000, 5000, 0, 100, EntityState.ALIVE, null, null, null, new ArrayList<>(){}, 50, false, 50, 500, 500, 1000);
     }
 
+    public Dragon (Dragon other) {
+        super(other);
+    }
+
+    @Override
+    public Dragon copy() {
+        return new Dragon(this);
+    }
+
     @Override
     public void DropLoot(Player player) {
         Key.Owner = player;

Java-Knight/src/main/java/org/project/entity/enemies/Enemy.java

@@ -36,6 +36,14 @@ public abstract class Enemy extends Entity {
         super();
     }
 
+    public Enemy(Enemy other) {
+        super(other);
+        this.Key = new KeyItem(other.Key.getName(), other.Key.Owner);
+    }
+
+    @Override
+    public abstract Enemy copy();
+
     public void DropLoot(Player player) {
         Random random = new Random();
 

Java-Knight/src/main/java/org/project/entity/enemies/Goblin.java

@@ -25,6 +25,15 @@ public class Goblin extends Enemy {
         this("Goblin", 75, 75, 100, 10, EntityState.ALIVE, null, null, null, new ArrayList<>(), 5, false, 15, 100, 100, 50);
     }
 
+    public Goblin (Goblin other) {
+        super(other);
+    }
+
+    @Override
+    public Goblin copy() {
+        return new Goblin(this);
+    }
+
     @Override
     public void SpecialAbility(Entity entity) {
         ModifyStamina(SpecialAbilityStamina, false);

Java-Knight/src/main/java/org/project/entity/enemies/Skeleton.java

@@ -29,6 +29,15 @@ public class Skeleton extends Enemy {
         this("Skeleton", 125, 125, 200, 15, EntityState.ALIVE, null, null, null, new ArrayList<>(), 5, false, 20, 100, 100, 100);
     }
 
+    public Skeleton (Skeleton other) {
+        super(other);
+    }
+
+    @Override
+    public Skeleton copy() {
+        return new Skeleton(this);
+    }
+
     @Override
     public ArrayList<FightMoves> GetAvailableMoves() {
         if (GetState() == EntityState.FROZEN || GetState() == EntityState.DEAD) return new ArrayList<>(){};

Java-Knight/src/main/java/org/project/entity/enemies/Vampire.java

@@ -25,6 +25,15 @@ public class Vampire extends Enemy {
         this("Vampire", 150, 150, 300, 20, EntityState.ALIVE, null, null, null, new ArrayList<>(), 8, false, 30, 100, 100, 150);
     }
 
+    public Vampire (Vampire other) {
+        super(other);
+    }
+
+    @Override
+    public Vampire copy() {
+        return new Vampire(this);
+    }
+
     @Override
     public void SpecialAbility(Entity entity) {
         int curHealth = entity.Health;

Java-Knight/src/main/java/org/project/entity/players/Assassin.java

@@ -27,12 +27,19 @@ public class Assassin extends Player {
         this(name, 125, 125, 100, 15, EntityState.ALIVE, null, null, null, new ArrayList<>(), 5, false, 35, 100, 100, 1, 0);
     }
 
+    public Assassin(Assassin other) {
+        super(other);
+    }
+
+    @Override
+    public Assassin copy() {
+        return new Assassin(this);
+    }
+
     @Override
     public void SpecialAbility(Entity entity) {
         ModifyStamina(SpecialAbilityStamina, false);
-        entity.SetState(EntityState.FROZEN);
         Damage(entity, GetDamage() * 3, new AttackPowerUp[]{AttackPowerUp.NO_DEFENSE});
-        Heal(MaxHealth/4);
     }
 
 

Java-Knight/src/main/java/org/project/entity/players/Knight.java

@@ -27,6 +27,15 @@ public class Knight extends Player {
         this(name, 150, 150, 100, 20, EntityState.ALIVE, null, null, null, new ArrayList<>(), 8, false, 30, 100, 100, 1, 0);
     }
 
+    public Knight(Knight other) {
+        super(other);
+    }
+
+    @Override
+    public Knight copy() {
+        return new Knight(this);
+    }
+
     @Override
     public void SpecialAbility(Entity entity) {
         ModifyStamina(SpecialAbilityStamina, false);
@@ -36,7 +45,7 @@ public class Knight extends Player {
 
     @Override
     public String GetSpecialAbilityDescription(Entity entity) {
-        return "Slam " + entity.Name + "with your unstoppable strength and stun them for the next turn";
+        return "Slam " + entity.Name + " with your unstoppable strength and stun them for the next turn";
     }
 
     @Override

Java-Knight/src/main/java/org/project/entity/players/Player.java

@@ -29,9 +29,18 @@ public abstract class Player extends Entity {
         super();
     }
 
+    public Player(Player other) {
+        super(other);
+        this.Level = other.Level;
+        this.LevelProgress = other.LevelProgress;
+    }
+
+    @Override
+    public abstract Player copy();
+
     public void LevelUpTo(int level) {
         while (Level < level) {
-            LevelUp();
+            UnconditionalLevelUp();
         }
     }
 
@@ -43,19 +52,23 @@ public abstract class Player extends Entity {
         }
     }
 
+    public void UnconditionalLevelUp() {
+        Level++;
+        double upgradeRatio = (1.1 + ((double) Level * 0.02));
+        int gift = Level * 10;
+
+        MaxStamina = (int) (MaxStamina * upgradeRatio);
+        MaxHealth = (int) (MaxHealth * upgradeRatio);
+        BaseDamage = (int) (BaseDamage * upgradeRatio);
+        DefenseBonus = (int) (DefenseBonus * upgradeRatio);
+        HealAmount = (int) (HealAmount * upgradeRatio);
+        ModifyMoney(gift, true);
+    }
+
     public void LevelUp() {
         while (LevelProgress >= 100) {
-            Level++;
+            UnconditionalLevelUp();
-            double upgradeRatio = (1.1 + ((double) Level * 0.02));
-            int gift = Level * 10;
-
             LevelProgress -= 100;
-            MaxStamina = (int) (MaxStamina * upgradeRatio);
-            MaxHealth = (int) (MaxHealth * upgradeRatio);
-            BaseDamage = (int) (BaseDamage * upgradeRatio);
-            DefenseBonus = (int) (DefenseBonus * upgradeRatio);
-            HealAmount = (int) (HealAmount * upgradeRatio);
-            ModifyMoney(gift, true);
         }
     }
 
@@ -64,15 +77,15 @@ public abstract class Player extends Entity {
         int damage = GetDamage();
 
         Damage(target, (int)(damage * 0.5), new AttackPowerUp[]{});
-        ModifyStamina(MaxStamina/8, true);
+        ModifyStamina(MaxStamina/8, false);
     }
 
     @Override
     public void HeavyAttack(IDamageable target) {
         int damage = GetDamage();
-        ModifyStamina(HeavyAttackStamina, false);
 
         Damage(target, damage, new AttackPowerUp[]{});
+        ModifyStamina(HeavyAttackStamina, false);
     }
 
     @Override

Java-Knight/src/main/java/org/project/entity/players/Wizard.java

@@ -27,6 +27,15 @@ public class Wizard extends Player {
         this(name, 100, 100, 100, 15, EntityState.ALIVE, null, null, null, new ArrayList<>(), 5, false, 40, 100, 100, 1, 0);
     }
 
+    public Wizard(Wizard other) {
+        super(other);
+    }
+
+    @Override
+    public Wizard copy() {
+        return new Wizard(this);
+    }
+
     @Override
     public void SpecialAbility(Entity entity) {
         ModifyStamina(SpecialAbilityStamina, false);

Java-Knight/src/main/java/org/project/item/Accessory/Accessory.java

@@ -45,13 +45,13 @@ public abstract class Accessory extends SellableItem implements IDamageable, IAt
 
     @Override
     public void HandleZeroHealth() {
-        this.DeattachFrom(this.Owner);
+        this.DeattachFrom(this.Owner, false);
         this.Owner.Inventory.remove(this);
     }
 
     @Override
-    public abstract void AttachTo(Entity entity);
+    public abstract void AttachTo(Entity entity, boolean fromInventory);
 
     @Override
-    public abstract void DeattachFrom(Entity entity);
+    public abstract void DeattachFrom(Entity entity, boolean toInventory);
 }

Java-Knight/src/main/java/org/project/item/Accessory/Costume.java

@@ -35,14 +35,14 @@ public class Costume extends Accessory implements IDefender {
     }
 
     @Override
-    public void AttachTo(Entity entity) {
+    public void AttachTo(Entity entity, boolean fromInventory) {
-        entity.RemoveFromInventory(this);
+        if (fromInventory) entity.RemoveFromInventory(this);
         entity.Costume = this;
     }
 
     @Override
-    public void DeattachFrom(Entity entity) {
+    public void DeattachFrom(Entity entity, boolean toInventory) {
         entity.Costume = null;
-        entity.AddToInventory(this);
+        if (toInventory) entity.AddToInventory(this);
     }
 }

Java-Knight/src/main/java/org/project/item/Accessory/Shield.java

@@ -35,14 +35,14 @@ public class Shield extends Accessory implements IDefender {
     }
 
     @Override
-    public void AttachTo(Entity entity) {
+    public void AttachTo(Entity entity, boolean fromInventory) {
-        entity.RemoveFromInventory(this);
+        if (fromInventory) entity.RemoveFromInventory(this);
         entity.Shield = this;
     }
 
     @Override
-    public void DeattachFrom(Entity entity) {
+    public void DeattachFrom(Entity entity, boolean toInventory) {
         entity.Shield = null;
-        entity.AddToInventory(this);
+        if (toInventory) entity.AddToInventory(this);
     }
 }

Java-Knight/src/main/java/org/project/item/Accessory/Weapon.java

@@ -17,14 +17,14 @@ public class Weapon extends Accessory implements IDamageUtil {
     }
 
     @Override
-    public void AttachTo(Entity entity) {
+    public void AttachTo(Entity entity, boolean fromInventory) {
-        entity.RemoveFromInventory(this);
+        if (fromInventory) entity.RemoveFromInventory(this);
         entity.Weapon = this;
     }
 
     @Override
-    public void DeattachFrom(Entity entity) {
+    public void DeattachFrom(Entity entity, boolean toInventory) {
         entity.Weapon = null;
-        entity.AddToInventory(this);
+        if (toInventory) entity.AddToInventory(this);
     }
 }

Java-Knight/src/main/java/org/project/util/DisplayItem.java

@@ -15,6 +15,8 @@ import java.util.Hashtable;
 public class DisplayItem {
     public static void DisplayItems(ArrayList<Item> items) {
         for (Item item : items) {
+            if (item == null) continue;
+
             String result = item.getName();
 
             if (item instanceof SellableItem) {
@@ -30,7 +32,7 @@ public class DisplayItem {
             }
 
             if (item instanceof IDefender) {
-                result += "\n    Damage = " + ((IDefender) item).GetDefense();
+                result += "\n    Defence = " + ((IDefender) item).GetDefense();
             }
 
             System.out.println(result);
@@ -42,6 +44,8 @@ public class DisplayItem {
         Dictionary<Integer, Item> dictionary = new Hashtable<>();
 
         for (Item item : items) {
+            if (item == null) continue;
+
             String result = index + " > " + item.getName();
 
             if (item instanceof KeyItem) {
@@ -61,7 +65,7 @@ public class DisplayItem {
             }
 
             if (item instanceof IDefender) {
-                result += "\n    Damage = " + ((IDefender) item).GetDefense();
+                result += "\n    Defence = " + ((IDefender) item).GetDefense();
             }
 
             dictionary.put(index, item);