#!/bin/bash

interval=2

while :; do
  if_new=$(ip -j r list default | jq -r '.[0].dev')

  unset type ip4 ip6 rate signal up down

  if [[ "$if_new" != "null" ]]; then
    if [[ "$if_new" != "$if" ]]; then
      bytes_down=$(cat "/sys/class/net/$if_new/statistics/rx_bytes")
      bytes_up=$(cat "/sys/class/net/$if_new/statistics/tx_bytes")
    fi

    type="$(nmcli -t -g general.type device show "$if_new")"
    ip4="$(nmcli -t -g ip4.address device show "$if_new")"
    ip6="$(nmcli -t -g ip6.address device show "$if_new" | sed 's/\\//g')"
    name="${type^}"

    if [[ "$type" == "wifi" ]]; then
      icon="󰖩"
      name="$(nmcli -t -g general.connection device show "$if_new")"
      rate="$(nmcli -t -g 'AP' device show wlo1 | awk -F ':' '{if ($2 == "*") { print $12 } }')"
      signal="$(nmcli -t -g 'AP' device show wlo1 | awk -F ':' '{if ($2 == "*") { print $13 } }')%"
    elif [[ "$type" == "ethernet" ]]; then
      icon="󰛳"
    else
      icon="󰲛"
    fi

    bytes_down_new=$(cat "/sys/class/net/$if_new/statistics/rx_bytes")
    bitrate_down=$(( (bytes_down_new - bytes_down) / interval ))
    bytes_down=$bytes_down_new
    if [[ $bitrate_down -lt 1024 ]]; then
      down="${bitrate_down}B/s"
    else
      down="$(numfmt --to=iec $bitrate_down)/s"
    fi

    bytes_up_new=$(cat "/sys/class/net/$if_new/statistics/tx_bytes")
    bitrate_up=$(( (bytes_up_new - bytes_up) / interval ))
    bytes_up=$bytes_up_new
    if [[ $bitrate_up -lt 1024 ]]; then
      up="${bitrate_up}B/s"
    else
      up="$(numfmt --to=iec $bitrate_up)/s"
    fi
  else
    icon="󰲛"
    name="Not connected"
  fi

  if="$if_new"

  cat << EOF
{"if": "$if", "icon": "$icon", "type": "$type", "name": "$name", "ip4": "$ip4", "ip6": "$ip6", "rate": "$rate", "signal": "$signal", "down": "$down", "up": "$up"}
EOF

  sleep $interval
done