#!/usr/bin/env python3

import database
import argparse
import requests
import typing
import ipaddress
import logging
import time

IPNetwork = typing.Union[ipaddress.IPv4Network, ipaddress.IPv6Network]


def get_ranges(asn: str) -> typing.Iterable[str]:
    req = requests.get(
        'https://stat.ripe.net/data/as-routing-consistency/data.json',
        params={'resource': asn}
    )
    data = req.json()
    for pref in data['data']['prefixes']:
        yield pref['prefix']


def get_name(asn: str) -> str:
    req = requests.get(
        'https://stat.ripe.net/data/as-overview/data.json',
        params={'resource': asn}
    )
    data = req.json()
    return data['data']['holder']


if __name__ == '__main__':

    log = logging.getLogger('feed_asn')

    # Parsing arguments
    parser = argparse.ArgumentParser(
        description="Add the IP ranges associated to the AS in the database")
    args = parser.parse_args()

    DB = database.Database()

    def add_ranges(path: database.Path,
                   match: database.Match,
                   ) -> None:
        assert isinstance(path, database.AsnPath)
        assert isinstance(match, database.AsnNode)
        asn_str = database.Database.unpack_asn(path)
        DB.enter_step('asn_get_name')
        name = get_name(asn_str)
        match.name = name
        DB.enter_step('asn_get_ranges')
        for prefix in get_ranges(asn_str):
            parsed_prefix: IPNetwork = ipaddress.ip_network(prefix)
            if parsed_prefix.version == 4:
                DB.set_ip4network(
                    prefix,
                    source=path,
                    updated=int(time.time())
                )
                log.info('Added %s from %s (%s)', prefix, path, name)
            elif parsed_prefix.version == 6:
                log.warning('Unimplemented prefix version: %s', prefix)
            else:
                log.error('Unknown prefix version: %s', prefix)

    for _ in DB.exec_each_asn(add_ranges):
        pass

    DB.save()