#!/bin/python3

import sys
import csv
import re
from pathlib import Path


def usage():
    print('Usage: ynab.py <filename>')


def is_final(row):
    return row[2] not in ['VISA', 'Varekjøp']


def convert(reader, writer):
    header = ['Date', 'Payee', 'Memo', 'Outflow', 'Inflow']

    writer.writerow(header)

    # Ignore header
    reader.__next__()

    for row in reader:
        if not is_final(row):
            continue

        money_out = 0
        money_in = 0

        money = float(row[3].replace(',', '.'))

        if money >= 0:
            money_in = money
        else:
            money_out = -money

        memo = re.match(r'="[ ]?(.+)"', row[2]).groups()[0]

        new_row = [*row[:2], memo, money_out, money_in]
        writer.writerow(new_row)


def main():
    if len(sys.argv) != 2:
        usage()
        exit(1)

    filepath = Path(sys.argv[1])

    new_basename = f'ynab-{filepath.name}'
    new_filepath = filepath.parent / new_basename

    with filepath.open(mode='r') as old_file:
        reader = csv.reader(old_file, delimiter=';')

        with new_filepath.open(mode='w') as new_file:
            writer = csv.writer(new_file)
            convert(reader, writer)


if __name__ == '__main__':
    main()