from datetime import datetime, date


def get_relative_date(past_date, reference_date=None):
    """
    Return how long before reference_date past_date is as string.

    Params:
        @past_date: datetime
        @reference_date: datetime, defaults to current date and time

        @return: string
    """

    if not past_date:
        return "Never"
    if not reference_date:
        reference_date = datetime.now()

    # Check parameters
    if past_date > reference_date:
        return "get_relative_date() past_date is after relative_date"

    weeks, days = divmod((reference_date - past_date).days, 7)
    if weeks == days == 0:
        # Played today, so return time instead
        return past_date.strftime("%H:%M")
    if weeks == 1:
        weeks_str = "week"
    else:
        weeks_str = "weeks"
    if days == 1:
        days_str = "day"
    else:
        days_str = "days"
    return f"{weeks} {weeks_str}, {days} {days_str} ago"


def ms_to_mmss(ms, decimals=0, negative=False):
    if not ms:
        return "-"
    sign = ""
    if ms < 0:
        if negative:
            sign = "-"
        else:
            ms = 0

    minutes, remainder = divmod(ms, 60 * 1000)
    seconds = remainder / 1000

    # if seconds >= 59.5, it will be represented as 60, which looks odd.
    # So, fake it under those circumstances
    if seconds >= 59.5:
        seconds = 59.0

    return f"{sign}{minutes:.0f}:{seconds:02.{decimals}f}"