from datetime import datetime, timedelta, timezone
from message_parse import Message
import re


def filter_message_list(message_list: list[Message], window: timedelta):
    now = datetime.now(timezone.utc)
    return [m for m in message_list if now - m.date <= window]


def parse_window(s: str) -> int:
    pattern = r"(?:(\d+)h)?(?:(\d+)m)?(?:(\d+)s)?$"
    match = re.fullmatch(pattern, s.strip())

    if not match:
        raise ValueError(f"Invalid duration: {s}")

    h, m, sec = match.groups()

    return (
        (int(h) * 3600 if h else 0)
        + (int(m) * 60 if m else 0)
        + (int(sec) if sec else 0)
    )