from datetime import datetime
from typing import List, Set, Optional
from .message import MailIntakeMessage

class MailIntakeThread:
    thread_id: str
    normalized_subject: str
    participants: Set[str]
    messages: List[MailIntakeMessage]
    last_activity_at: Optional[datetime]
    def __init__(self, thread_id: str, normalized_subject: str, participants: Set[str] = ..., messages: List[MailIntakeMessage] = ..., last_activity_at: Optional[datetime] = ...) -> None: ...
    def add_message(self, message: MailIntakeMessage) -> None: ...