import random

class Character:
    def __init__(self, name, health, attack, defense):
        self.name = name
        self.health = health
        self.attack = attack
        self.defense = defense

    def is_alive(self):
        return self.health > 0

    def take_damage(self, damage):
        self.health -= max(0, damage - self.defense)

    def attack_target(self, target):
        damage = random.randint(1, self.attack)
        target.take_damage(damage)
        print(f"{self.name} attacks {target.name} for {damage} damage!")

class Player(Character):
    def __init__(self, name):
        super().__init__(name, health=100, attack=20, defense=10)
        self.inventory = {"Health Potion": 5}

    def use_health_potion(self):
        if self.inventory["Health Potion"] > 0:
            self.health += 30
            self.inventory["Health Potion"] -= 1
            print(f"{self.name} uses a Health Potion and restores 30 health!")
        else:
            print("No Health Potions left!")

class Enemy(Character):
    def __init__(self, name):
        super().__init__(name, health=50, attack=15, defense=5)

def main():
    player_name = input("Enter your character's name: ")
    player = Player(player_name)

    enemy = Enemy("Evil Goblin")

    print(f"A wild {enemy.name} appears!")

    while player.is_alive() and enemy.is_alive():
        print("\nPlayer Stats:")
        print(f"Health: {player.health}")
        print(f"Enemy Stats:")
        print(f"Health: {enemy.health}")

        action = input("\nWhat do you want to do? (attack/use potion/quit): ").lower()

        if action == "attack":
            player.attack_target(enemy)
            if not enemy.is_alive():
                print(f"You defeated the {enemy.name}!")
                break
            enemy.attack_target(player)
            if not player.is_alive():
                print("You were defeated. Game over!")
                break

        elif action == "use potion":
            player.use_health_potion()
            enemy.attack_target(player)
            if not player.is_alive():
                print("You were defeated. Game over!")
                break

        elif action == "quit":
            print("Thanks for playing! Goodbye.")
            break

        else:
            print("Invalid action. Try again.")

if __name__ == "__main__":
    main()