import datetime
import functools
import time


def timer(func):
    """Print the runtime of the decorated function"""

    @functools.wraps(func)
    def wrapper_timer(*args, **kwargs):
        start_time = time.perf_counter()  # 1
        value = func(*args, **kwargs)
        end_time = time.perf_counter()  # 2
        run_time = end_time - start_time  # 3
        print(f"Finished {func.__name__!r} in {run_time:.4f} secs")
        return value

    return wrapper_timer


def humanize_date_difference(
    older: datetime, newer: datetime = None, offset: int = None, debug=False
):
    if newer:
        dt = newer - older
        milliseconds = dt.microseconds / 1e3
        offset = milliseconds + (dt.seconds * 1000) + (dt.days * 1000 * 60 * 60 * 24)
    if offset:
        if debug:
            print(f"{offset} s offset")

        delta_ms = int(offset % 1000)
        offset /= 1e3
        delta_s = int(offset % 60)
        offset /= 60
        delta_m = int(offset % 60)
        offset /= 60
        delta_h = int(offset % 24)
        offset /= 24
        delta_d = int(offset)

        if debug:
            print("{:d} ms".format(delta_ms))
            print("{:d} s".format(delta_s))
            print("{:d} m".format(delta_m))
            print("{:d} h".format(delta_h))
            print("{:d} d".format(delta_d))
    else:
        raise ValueError("Must supply otherdate or offset (from now)")

    if delta_d > 1:
        if delta_d > 6:
            date = older + datetime.timedelta(
                days=-delta_d, hours=-delta_h, minutes=-delta_m
            )
            return date.strftime("%A, %Y %B %m, %H:%I")
        else:
            wday = older + datetime.timedelta(days=-delta_d)
            return wday.strftime("%A")
    if delta_d == 1:
        return "Yesterday"
    if delta_h > 0:
        return "{:.0f}h {:.0f}m ago".format(delta_h, delta_m)
    if delta_m > 0:
        return "{:.0f}m {:.0f}s ago".format(delta_m, delta_s)
    if delta_s > 0:
        return "{:.0f}s ago".format(delta_s)
    else:
        return "{:.0f} ms ago".format(delta_ms)


if __name__ == "__main__":
    date1 = datetime.datetime.now()
    date2 = datetime.datetime.now() - datetime.timedelta(milliseconds=20)
    print(humanize_date_difference(date2, date1, debug=True))