import logging
from functools import reduce


class RollbotPlugin:
    def __init__(self, command, bot, logger=logging.getLogger(__name__)):
        self.command = command
        self.bot = bot
        self.logger = logger
        self.logger.info(f"Intializing {type(self).__name__} matching {command}")

    def on_start(self, db):
        self.logger.info(f"No on_start initialization of {type(self).__name__}")

    def on_shutdown(self, db):
        self.logger.info(f"No on_shutdown de-initialization of {type(self).__name__}")

    def on_command(self, db, message):
        raise NotImplementedError

    def help_msg(self):
        return f"No help message provided for {self.command} command!"

    @staticmethod
    def find_all_plugins():
        def get_subclasses(clazz):
            s = set(clazz.__subclasses__())
            return s | reduce(set.union, (get_subclasses(sc) for sc in s), set())
        return get_subclasses(RollbotPlugin)