source: python-cinema-club-bot/predicates.py@ ac7b16a

# This file is part of python-cinema-club-bot
# contributed in 2024 by Mikhail Kirillov (~w96k) <w96k@runbox.com>

# To the extent possible under law, the author(s) have dedicated all copyright
# and related and neighboring rights to this software to the public domain
# worldwide. This software is distributed without any warranty.

# You should have received a copy of the CC0 Public Domain Dedication along
# with this software. If not, see:
# <http://creativecommons.org/publicdomain/zero/1.0/>

from telegram.ext import ContextTypes
from datetime import datetime
from typing import Optional


def is_past(dt: Optional[datetime]) -> bool:
    if dt is None:
        return False

    return dt < datetime.today()


def has_finished_movie(context: ContextTypes.DEFAULT_TYPE) -> bool:
    events = context.chat_data["events"]
    movies = context.chat_data["movies"]

    last_event = events[-1] if events != [] else None
    last_movie = movies[-1] if movies != [] else None

    return last_event is not None and last_movie is not None and \
        last_event["user"] == last_movie["user"] and \
        is_past(last_event["when"])


def has_event_without_movie(context: ContextTypes.DEFAULT_TYPE) -> bool:
    events = context.chat_data["events"]
    last_event = events[-1] if events != [] else None

    return last_event and last_event["movie"] is None


def has_unfinished_event(context: ContextTypes.DEFAULT_TYPE) -> bool:
    events = context.chat_data["events"]
    last_event = events[-1] if events != [] else None

    if last_event is None:
        return False

    if last_event["movie"] is None:
        return False

    return not is_past(last_event["when"])