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

# Find battery + AC device (works on most laptops)
BAT="$(ls -1 /sys/class/power_supply 2>/dev/null | grep -E '^BAT|^CMB|^BATT' | head -n1 || true)"
AC="$(ls -1 /sys/class/power_supply 2>/dev/null | grep -E '^AC|^ADP|^ACAD' | head -n1 || true)"

if [[ -z "${BAT}" ]]; then
  echo "  --%" # unknown
  exit 0
fi

BAT_PATH="/sys/class/power_supply/${BAT}"
STATUS="$(<"${BAT_PATH}/status")"     # Charging|Discharging|Full|Not charging|Unknown
CAPACITY="$(<"${BAT_PATH}/capacity")" # 0-100

#  0-10,  11-35,  36-60,  61-85,  86-100
if ((CAPACITY <= 10)); then
  if [[ "${STATUS}" == "Charging" ]]; then
    ICON="󰢜 "
  else
    ICON="󰁺 "
  fi
elif ((CAPACITY <= 30)); then
  if [[ "${STATUS}" == "Charging" ]]; then
    ICON="󰂇 "
  else
    ICON="󰁼 "
  fi
elif ((CAPACITY <= 60)); then
  if [[ "${STATUS}" == "Charging" ]]; then
    ICON="󰂉 "
  else
    ICON="󰁿 "
  fi
elif ((CAPACITY <= 80)); then
  if [[ "${STATUS}" == "Charging" ]]; then
    ICON="󰂊 "
  else
    ICON="󰂁 "
  fi
else
  if [[ "${STATUS}" == "Charging" ]]; then
    ICON="󰂅 "
  else
    ICON="󰁹 "
  fi
fi

# If full, show a nicer indicator
if [[ "${STATUS}" == "Full" ]]; then
  CHG_IND=" " # nf-fa-check
fi

echo "${ICON} ${CAPACITY}%"