#!/usr/bin/env python3
"""
+---------------------------------+
| CRC32 sum generator CLI utility |
+---------------------------------+
"""

import argparse
from multiprocessing import Pool
from fck import checker, fileutils


def main() -> None:
    """
    Main function, should only run when programm gets directly invoked.
    """
    parser = argparse.ArgumentParser(description="Calculate CRC32 of files")
    parser.add_argument("-b", "--bigfiles",
                        help="parse files that exceed your memory limit",
                        action="store_true")
    parser.add_argument("-p", "--processes",
                        help="",
                        default=2,
                        type=int)
    parser.add_argument("-c", "--checksfv",
                        help="",
                        default="",
                        type=str)
    parser.add_argument("files",
                        help="files and folders to process",
                        nargs='*',
                        default=[])
    args = parser.parse_args()

    file_list = fileutils.search(args.files)
    ppool = Pool(processes=args.processes)
    file_list_checked = ppool.starmap(checker.check, [(x, args.bigfiles)
                                                      for x in list(file_list)])
    ppool.close()
    print(f"[{len([x for x in file_list_checked if x])}/{len(file_list_checked)}] Files passed")


if __name__ == '__main__':
    try:
        main()
    except KeyboardInterrupt:
        print("Exception: KeyboardInterrupt")