from ics import Calendar

td_titles = ["TD"]
td_groups = ["1.1", "1.2"]
sh_titles = ["ANGLAIS", "ETHIQUE"]
sh_groups = ["1.1", "1.2", "1.3"]

def _filter_group(name: str, titles: list[str], group: str, groups: list[str]) -> bool | None:
    has_group = False
    for title_group in groups:
        if title_group in name:
            has_group = True
            break

    if not has_group:
        return None

    for title in titles:
        if title.upper() in name.upper():
            return group == "all" or group in name

    return None

def _filter_event(name: str, td_group: str, sh_group: str) -> bool:
    res = _filter_group(name, td_titles, td_group, td_groups)
    if res is not None:
        return res

    if _filter_group(name, sh_titles, sh_group, sh_groups) == False:
        return False

    return True

def filter_calendar(calendar: Calendar, td_group: str, sh_group: str) -> Calendar:
    filtered_calendar = Calendar()

    for event in calendar.events:
        if _filter_event(event.name, td_group, sh_group):
            filtered_calendar.events.add(event)

    return filtered_calendar