6.9th Work Anniversary

[cooper:~/random_repo]$ cat experimental/cooper/fv_6_9_th/fv_six_point_nine.py
#!/usr/bin/env python3

import asyncio
import logging
import sys
from datetime import datetime, timedelta
from typing import Union

import click


LOG = logging.getLogger(__name__)


def _handle_debug(
    ctx: click.core.Context,
    param: Union[click.core.Option, click.core.Parameter],
    debug: Union[bool, int, str],
) -> Union[bool, int, str]:
    """Turn on debugging if asked otherwise INFO default"""
    log_level = logging.DEBUG if debug else logging.INFO
    logging.basicConfig(
        format="[%(asctime)s] %(levelname)s: %(message)s (%(filename)s:%(lineno)d)",
        level=log_level,
    )
    return debug


async def async_main(debug: bool, start_date: str) -> int:
    year = int(start_date[0:4])
    month = int(start_date[4:6])
    day = int(start_date[6:8])
    if debug:
        print(f"Start Date - Year: {year} Month: {month} Day: {day}")

    start_datetime = datetime(year, month, day)
    ninty_pct_days = int(0.9 * 365.0)
    # Not caring about leaps seconds etc. - We plus 1 as there should be 1 leap lear
    six_point_nine_years = timedelta(days=(6 * 365 + ninty_pct_days + 1))

    print(
        f"With a start date of {start_date} the 6.9 FV is around:\n"
        + f"{start_datetime + six_point_nine_years}"
    )
    return 0


@click.command(context_settings={"help_option_names": ["-h", "--help"]})
@click.option(
    "--debug",
    is_flag=True,
    callback=_handle_debug,
    show_default=True,
    help="Turn on debug logging",
)
@click.argument("start_date")
@click.pass_context
def main(ctx: click.core.Context, **kwargs) -> None:
    """ START_DATE needs to be YYYYMMdd """
    LOG.debug(f"Starting {sys.argv[0]}")
    ctx.exit(asyncio.run(async_main(**kwargs)))


if __name__ == "__main__":
    main()