#!/bin/dash

print_state() {
  case "$1" in
    eth*)
      echo ethernet
      ;;
    wlan*)
      echo wireless
      ;;
    usb*)
      echo tethering
      ;;
    *)
      echo disconnected
      ;;
  esac
}

wifi_strength() {
    if [ "$1" -le -80 ]; then echo terrible
  elif [ "$1" -le -70 ]; then echo bad
  elif [ "$1" -le -60 ]; then echo mediocre
  elif [ "$1" -le -40 ]; then echo good
  else                        echo excellent
  fi
}

print_infos() {
  if [ -n "$1" ]; then
    route_line=$(ip route show dev "$1" | awk '($1 == "default") { print }')

    printf ',"ip":{"local":"%s","gateway":"%s"}' \
      "$(echo "$route_line" | awk '{ print $7 }')" \
      "$(echo "$route_line" | awk '{ print $3 }')"

    if [ "$state" = wireless ]; then
      signal=$(iw dev "$1" link | awk '($1 == "signal:") { print $2}')
      printf ',"wifi":{"signal":"%s","ssid":"%s"}' \
        "$(wifi_strength "$signal")" \
        "$(iw dev wlan0 info | grep '^\s*ssid ' | xargs | cut -d \  -f 2-)"
    fi
  fi
}

print_network_status() {
  device=$(ip route | awk '($1 == "default") { print $5 }')
  state=$(print_state "$device")

  printf '{"state":"%s"%s}\n' \
    "$state" \
    "$(print_infos "$device")"
}

print_network_status
tail -f -n 0 /run/dhcpcd/log /var/log/iwd/current | \
while read -r _unused; do
  print_network_status
done