#!/usr/bin/env python3
# simplefinjson2csv 1.0 - (c) Simon Michael 2025

__version__ = "1.0"
__author__  = "Simon Michael"
versionmsg = f"%prog {__version__}, by {__author__} 2025; part of the hledger project."
usagemsg   = """%prog [options] [JSONFILE|-] [-]

Read SimpleFIN /accounts JSON from a JSONFILE or stdin;
write each account's transactions as date-ordered CSV,
to separate CSV files or to stdout.

Requirements:
 python 3
 a SimpleFIN account with financial institution(s) and app connection configured.

Examples: 
$ simplefinjson | simplefinjson2csv
$ simplefinjson >sf.json; simplefinjson2csv sf.json -
"""

from pprint import pprint as pp
import csv
import datetime
import decimal
import json
import optparse
import re
import sys

def parse_options():
    parser = optparse.OptionParser(usage=usagemsg, version=versionmsg)
    opts, args = parser.parse_args()
    if len(args) > 2:
        parser.print_help()
        sys.exit()
    return opts, args

def main():
    opts, args = parse_options()
    with open(args[0],'r') if len(args) > 0 and not args[0]=='-' else sys.stdin as inp:

        i = json.load(inp)
        for a in i['accounts']: #[0:1]:
            aid = a['id']
            aname = a['name']
            oname = a['org']['name']
            ts = a['transactions']
            if len(args) < 2:
                fname = f'sf-{aid}.csv'
                out = open(fname,'w')
                print(f"writing {len(ts)} transactions to {fname}")
            else:
                out = sys.stdout
            w = csv.writer(out, quoting=csv.QUOTE_ALL)
            w.writerow([
                "date",
                "id",
                "amount",
                "description",
                "payee",
                "memo"
                ])

            for t in reversed(a['transactions']):
              dt = datetime.datetime.fromtimestamp(t['posted'])
              # dtl = dt.astimezone()
              w.writerow([
                  dt.strftime('%Y-%m-%d'), # %H:%M:%S %Z'),
                  t['id'],
                  t['amount'],
                  t['description'],
                  t['payee'],
                  t['memo']
                  ])
  
if __name__ == "__main__": main()