#!/usr/bin/env bash
# Recommended to store this file in the $HOME/.config/polybar/polybar-scripts/ folder
# you can use... mkdir $HOME/.config/polybar && mkdir $HOME/.config/polybar/polybar-scripts/
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# Temp File to save a state, Polybar makes a variable loop impossible
# unless we pull the value from outside of our script in another file.
F=/tmp/polybar_mask_ip_toggle
# Our print values!
IP="$(hostname -I | awk '{print $1}')"
MASK="████████████"
# detect real interface name
INTERFACENAME=$(ip route get 1.1.1.1 2>/dev/null \
     | awk '/dev/ { for(i=1;i<NF;i++) if($i=="dev") print $(i+1)}' \
     | head -n1)
[[ -z "$IF" ]] && IF="eth0"

# Initialize state if missing
if [[ ! -f $F ]]; then
  echo 1 > "$F"
fi

# If called to toggle, flip 1↔ 2, write and exit
if [[ $1 == "toggle" ]]; then
  state=$(<"$F")
  # compute next: 1→ 2, 2→ 1
  next=$(( state % 2 + 1 ))
  echo $next > "$F"
  exit 0
fi

# Otherwise, just read the state and print
state=$(<"$F")
if (( state == 1 )); then
  echo "%{F#F0C674}$INTERFACENAME%{F-} $MASK"
else
  echo "%{F#F0C674}$INTERFACENAME%{F-} $IP"
fi