import json


class Creatures:
    creatures = None

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

    def __init__(self):
        if not Creatures.creatures:
            self.load_creature_data()

    def get_creature(self, creature_name):
        """Returns the dictionary of the specified creature."""
        return self.creatures.get(creature_name)

    def get_creature_list(self):
        """Returns a list of all creatures."""
        return sorted(list(self.creatures.keys()))