#!/usr/bin/env python3
import argparse
import json
import re
import sys
import time
import traceback

import paramiko

from checker import nagios
from checker.result import quit_check
from checker.types import try_int, try_float

WIFI_2 = list(range(1, 12))
WIFI_5 = list(range(32, 178))


def main(args):
    ssh = paramiko.SSHClient()
    ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())

    try:
        ssh.connect(args.host, username='root')
    except paramiko.ssh_exception.AuthenticationException:
        quit_check(
            f'SSH authentication to root@{args.host} failed! Make sure your key exists on the remote system or copy it over with ssh-copy-id',
            nagios.STATE_UNKNOWN)
        sys.exit(nagios.STATE_UNKNOWN)
    except paramiko.ssh_exception.NoValidConnectionsError:
        quit_check(f'SSH connection failed to {args.host}', nagios.STATE_UNKNOWN)

    stdin, stdout, stderr = ssh.exec_command(f'iwinfo {args.interface} assoclist')
    if stdout.channel.recv_exit_status() != 0:
        quit_check(f'command failed:\nSTDOUT: {"".join(stdout.readlines())}\nSTDERR: {"".join(stderr.readlines())}',
                   nagios.STATE_UNKNOWN)
    output = [str(x).strip('\n').strip(' ') for x in stdout.readlines()]

    connected_clients = 0
    for line in output:
        is_header_line = bool(
            re.search(r'^[\t\s\n]', line) is None and len(line) and 'No station connected' not in line
        )
        if is_header_line:
            connected_clients += 1

    perfdata = {
        'connected_clients': {'value': connected_clients, 'min': 0},
    }

    quit_check(
        f"{connected_clients} connected clients on {args.interface}",
        nagios.STATE_OK,
        perfdata=perfdata)


if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument('--host', required=True, help='The host to SSH into.')
    parser.add_argument('--interface', required=True, help='The wireless interface to use (example: `wlan0`).')
    args = parser.parse_args()

    try:
        main(args)
    except Exception as e:
        print(f'UNKNOWN - exception "{e}"')
        traceback.print_exc()
        sys.exit(nagios.STATE_UNKNOWN)