everyone-mention-telegram-bot/src/handlers/mentionHandler.py

from ..config.contents import mention_failed
from ..entities.group import Group
from ..entities.user import User
from ..firebaseProxy import FirebaseProxy
from ..repositories.groupRepository import GroupRepository
from .handlerInterface import HandlerInterface
from telegram.ext.callbackcontext import CallbackContext
from telegram.ext.commandhandler import CommandHandler
from telegram.update import Update


class MentionHandler(HandlerInterface):
    botHandler: CommandHandler
    commandName: str = 'everyone'

    def __init__(self) -> None:
        self.botHandler = CommandHandler(
            self.getCommandName(), 
            self.handle
        )

    def handle(self, update: Update, context: CallbackContext) -> None:
        groupId = update.effective_chat.id
        groupRepository = GroupRepository()
        mentionMessage = self.buildMentionMessage(groupRepository.get(id=groupId))

        update.message.reply_markdown_v2(text=mentionMessage)

    def getBotHandler(self) -> CommandHandler:
        return self.botHandler

    def getCommandName(self) -> str:
        return self.commandName

    def buildMentionMessage(self, group: Group) -> str:
        result = ''

        for user in group.getUsers():
            username = user.getUsername() or user.getId()
            result +=  f'*[{username}](tg://user?id={user.getId()})* '

        return result or mention_failed