'''
reserve_disk_space
==================

Exits with status of 0 if the disk has the requested amount of space, 1 if not.

> reserve_disk_space reserve [drive]

reserve:
    A string like "50g" or "100 gb"

drive:
    Filepath to the drive you want to check. Defaults to cwd drive.
'''
import argparse
import sys

from voussoirkit import betterhelp
from voussoirkit import bytestring
from voussoirkit import pathclass
from voussoirkit import vlogging

log = vlogging.getLogger(__name__, 'reserve_disk_space')

def reserve_disk_space_argparse(args):
    reserve = bytestring.parsebytes(args.reserve)
    drive = pathclass.Path(args.drive)
    try:
        free = drive.assert_disk_space(reserve)
        free = bytestring.bytestring(free)
        reserve = bytestring.bytestring(reserve)
        log.info('There is %s available out of %s.', free, reserve)
        return 0
    except pathclass.NotEnoughSpace as exc:
        free = bytestring.bytestring(exc.free)
        reserve = bytestring.bytestring(exc.reserve)
        log.fatal('Only %s available out of %s.', free, reserve)
        return 1

@vlogging.main_decorator
def main(argv):
    parser = argparse.ArgumentParser(description=__doc__)

    parser.add_argument('reserve')
    parser.add_argument('drive', nargs='?', default='.')
    parser.set_defaults(func=reserve_disk_space_argparse)

    return betterhelp.single_main(argv, parser, __doc__)

if __name__ == '__main__':
    raise SystemExit(main(sys.argv[1:]))