import json


class Monsters:
    monsters = None

    @staticmethod
    def load_monsters_data():
        """Loads the monsters data from a JSON file"""
        with open('app/tables/monsters.json') as f:
            Monsters.monsters = json.load(f)

    def __init__(self):
        if not Monsters.monsters:
            self.load_monsters_data()

    def get_monster(self, monster_name):
        """Returns the dictionary of the specified monster."""
        return self.monsters.get(monster_name)

    def add_monster(self, monster_name, attributes):
        """Adds a new monster to the monsters dictionary."""
        self.monsters[monster_name] = attributes

    def remove_monster(self, monster_name):
        """Removes a monster from the monsters dictionary."""
        if monster_name in self.monsters:
            del self.monsters[monster_name]