#!/usr/bin/env Rscript
library(readr)
library(dplyr)
library(magrittr)

args = commandArgs(trailingOnly=TRUE)

if (length(args) != 2) {
  stop("usage: nab2ynab.R nab.csv ynab.csv", call.=FALSE)
}

infile <- args[1]
outfile <- args[2]

data = read_csv(infile,skip = 6)
data %<>% tbl_df
ynab <-
  data %>%
  filter(grepl("^[0-9][0-9]\\.[0-9][0-9]\\.[0-9]{4}$",`Booking Date`)) %>%
  transmute(Date=sub("^([0-9][0-9])\\.([0-9][0-9])\\.([0-9]{4})$","\\1/\\2/\\3",`Booking Date`),
        Payee=sub("^([^,]*),.*$","\\1",Text),
        Category="",
        Memo=sub("^[^,]*,(.*)$","\\1",Text),
        Outflow=Debit,
        Inflow=Credit) %>%
  tbl_df
write_csv(ynab, outfile, na="")