from dataclasses import dataclass, field
from typing import List, Dict
from datetime import datetime

@dataclass
class Room:
    code: str
    created_at: datetime = field(default_factory=datetime.utcnow)
    messages: List[Dict] = field(default_factory=list)  # Could include sender, timestamp, etc.
    password: str = None  # Optional

    def add_message(self, sender: str, text: str):
        self.messages.append({
            "sender": sender,
            "text": text,
            "timestamp": datetime.now().isoformat()
        })

    def check_password(self, attempt: str) -> bool:
        return self.password is None or self.password == attempt