#!/usr/bin/env python3
"""
  fritzbox_wifi_devices - A munin plugin for Linux to monitor AVM Fritzbox
  Copyright (C) 2015 Christian Stade-Schuldt
  Author: Christian Stade-Schuldt
  Like Munin, this plugin is licensed under the GNU GPL v2 license
  http://www.opensource.org/licenses/GPL-2.0
  Add the following section to your munin-node's plugin configuration:

  [fritzbox_*]
  env.fritzbox_ip [ip address of the fritzbox]
  env.fritzbox_username [fritzbox username]
  env.fritzbox_password [fritzbox password]
  
  This plugin supports the following munin configuration parameters:
  #%# family=auto contrib
  #%# capabilities=autoconf
"""
import json
import os
import re
import sys

import fritzbox_helper as fh

locale = os.environ.get("locale", "de")
patternLoc = {"de": r"(\d+) WLAN", "en": r"(\d+) wireless LAN"}

PAGE = "energy"
pattern = re.compile(patternLoc[locale])


def get_connected_wifi_devices():
    """gets the numbrer of currently connected wifi devices"""

    server = os.environ["fritzbox_ip"]
    username = os.environ["fritzbox_username"]
    password = os.environ["fritzbox_password"]

    session_id = fh.get_session_id(server, username, password)
    xhr_data = fh.get_xhr_content(server, session_id, PAGE)
    data = json.loads(xhr_data)
    m = re.search(pattern, data["data"]["drain"][2]["statuses"][-1])
    if m:
        connected_devices = int(m.group(1))
        print("wifi.value %d" % connected_devices)


def print_config():
    print("graph_title AVM Fritz!Box Connected Wifi Devices")
    print("graph_vlabel Number of devices")
    print("graph_args --base 1000")
    print("graph_category network")
    print("graph_order wifi")
    print("wifi.label Wifi Connections on 2.4 & 5 Ghz")
    print("wifi.type GAUGE")
    print("wifi.graph LINE1")
    print("wifi.info Wifi Connections on 2.4 & 5 Ghz")
    if os.environ.get("host_name"):
        print("host_name " + os.environ["host_name"])


if __name__ == "__main__":
    if len(sys.argv) == 2 and sys.argv[1] == "config":
        print_config()
    elif len(sys.argv) == 2 and sys.argv[1] == "autoconf":
        print("yes")
    elif len(sys.argv) == 1 or len(sys.argv) == 2 and sys.argv[1] == "fetch":
        # Some docs say it'll be called with fetch, some say no arg at all
        try:
            get_connected_wifi_devices()
        except:
            sys.exit("Couldn't retrieve connected fritzbox wifi devices")