#!/usr/bin/env python3
import sys
from pathlib import Path

import toml

from rfc2317 import gen_reverse_pointers

RESOLVE_FILE = Path("dns", "db.10.127")
RFC2317_FILE = Path("dns", "rfc2317.toml")


def iter_rfc2317_entry():
    entries = toml.loads(RFC2317_FILE.read_text())
    for (route, attributes) in entries.items():
        ns = attributes.get("NS")
        ds = attributes.get("DS", list())
        ttl = attributes.get("TTL", -1)
        yield (route, ns, ds, ttl)


def main():
    orignal = RESOLVE_FILE.read_text()
    records = [orignal, "; AUTOGENERATED"]
    records.extend(("", "; rfc2317"))
    for route, ns, ds, ttl in iter_rfc2317_entry():
        records.extend(gen_reverse_pointers(route, ns, ds, ttl))
        records.append("")

    RESOLVE_FILE.write_text("\n".join(records))


if __name__ == "__main__":
    main()