#!/bin/sh

[ -z "$XDG_CACHE_HOME" ] && XDG_CACHE_HOME="$HOME/.cache"

check_batteries() {
	for battery in /sys/class/power_supply/BAT?; do
		battery_capacity="$(cat "$battery"/capacity)"
		batteries_total="$((batteries_total+battery_capacity))"

		if [ "$battery_capacity" -gt 70 ]; then icon=""
		elif [ "$battery_capacity" -gt 50 ]; then icon=""
		elif [ "$battery_capacity" -gt 30 ]; then icon=""
		else icon=""
		fi

		output="$output $icon $battery_capacity%"
	done

	if [ "$(cat /sys/class/power_supply/AC/online)" = 1 ]; then
		printf " %s\n" "${output## }"
		[ "$(cat "$XDG_CACHE_HOME"/battery)" = "charging" ] && return
		echo "charging" > "$XDG_CACHE_HOME"/battery
	elif [ "$batteries_total" -lt 20 ]; then
		printf " %s\n" "${output## }"
		[ "$(cat "$XDG_CACHE_HOME"/battery)" = "critical" ] && return
		echo "critical" > "$XDG_CACHE_HOME"/battery
		notify-send -u critical "Battery $batteries_total%" "Plug your computer"
	else
		printf "%s\n" "${output## }"
		[ "$(cat "$XDG_CACHE_HOME"/battery)" = "normal" ] && return
		echo "normal" > "$XDG_CACHE_HOME"/battery
	fi
}


find /sys/class/power_supply/BAT? >/dev/null 2>&1 && check_batteries || exit