#!/usr/bin/env bash
set -Eeuo pipefail

state_file="${XDG_RUNTIME_DIR:-/tmp}/waybar-network-state-${UID}"
current_ip_file="${XDG_RUNTIME_DIR:-/tmp}/waybar-network-current-ip-${UID}"

if [[ "${1:-}" == copy ]]; then
  if [[ -s "$current_ip_file" ]]; then
    current_ip=$(<"$current_ip_file")
    printf '%s' "$current_ip" | wl-copy
    notify-send -a Waybar -u low -r 9101 "IP address copied" "$current_ip"
  fi
  exit 0
fi

if [[ "${1:-}" == next ]]; then
  state=0
  [[ -r "$state_file" ]] && read -r state <"$state_file"
  printf '%s\n' "$((state + 1))" >"$state_file"
  pkill -RTMIN+8 waybar 2>/dev/null || true
  exit 0
fi

entries=()
while read -r interface addresses; do
  [[ -n "$interface" && -n "$addresses" ]] || continue
  entries+=("$interface $addresses")
done < <(
  ip -o -4 addr show scope global \
    | awk '{sub(/\/.*/, "", $4); addresses[$2] = addresses[$2] (addresses[$2] ? "," : "") $4} END {for (interface in addresses) print interface, addresses[interface]}' \
    | sort
)

public_ipv4=$(curl -4 -fsS --max-time 3 https://ifconfig.me/ip 2>/dev/null || true)
[[ -n "$public_ipv4" ]] && entries+=("public $public_ipv4")

if ((${#entries[@]} == 0)); then
  entries+=("network unavailable")
fi

state=0
[[ -r "$state_file" ]] && read -r state <"$state_file"
index=$((state % ${#entries[@]}))
tooltip=$(printf '%s\n' "${entries[@]}")
current_ip="${entries[$index]#* }"
if [[ "$current_ip" == unavailable ]]; then
  : >"$current_ip_file"
else
  printf '%s' "$current_ip" >"$current_ip_file"
fi

jq -cn --arg text "󰈀  ${entries[$index]}" --arg tooltip "$tooltip" \
  '{text: $text, tooltip: $tooltip}'