#!/usr/bin/env xonsh

import sys
from pathlib import Path

if len(sys.argv) < 2:
    exit("error: no argument")

f_path = Path(sys.argv[1])
if not f_path.exists():
    exit("error: file doesn't exist")

if not $(file -b --mime-type @(f_path)).startswith("image/"):
    exit("error: file isn't an image")

f_size = int($(ls -l @(f_path) | awk '{print $5}'))
if f_size > 500_000:
    cp @(f_path) @(f_path.stem)_old@(f_path.suffix)
    convert @(f_path) -define jpeg:extent=300kb @(f_path.stem).jpg

    if f_size > 700_000:
        convert @(f_path.stem)_old@(f_path.suffix) -define jpeg:extent=700kb @(f_path.stem)_full.jpg
    else:
        convert @(f_path.stem)_old@(f_path.suffix) @(f_path.stem)_full.jpg