import logging
from pathlib import Path


logging.basicConfig(level=logging.INFO)


def escape(string):
    """Return an escaped version of `string`."""
    string = string.replace('"', '""')
    if "," in string:
        string = '"' + string + '"'
    return string


def normalise(input, output):
    """Normalise `input` CSV file into `output` file."""
    Path(output).touch(exist_ok=True)
    with Path(input).open("r") as in_file, Path(output).open("w") as out_file:
        for in_line in in_file.readlines():
            out_elements = [
                escape(in_element) for in_element in in_line.strip().split("|")
            ]
            out_file.write(f"{','.join(out_elements)}\n")


if __name__ == "__main__":
    import argparse

    parser = argparse.ArgumentParser(description="Smol prog to normalise CSV files.")

    parser.add_argument("input")
    parser.add_argument("output")

    args = parser.parse_args()

    normalise(args.input, args.output)