#!/bin/sh

set -e

readonly TS_FILE="$XDG_DATA_HOME/battery-notification.timestamp"
[ -f "$TS_FILE" ] || touch "$TS_FILE"

cd /sys/class/power_supply/BAT1

read cap <capacity
read status <status

if [ $cap -le 20 -a $status != Charging ]
then
	now=`date +%s`
	read was <"$TS_FILE"

	if (set +e; [ $(($now - ${was:-0} > 60)) -eq 1 ])
	then
		notify-send -a 'battery' -u critical 'Battery Low' \
			'The current battery level is below 20%.  Plug the device into a charger ASAP.'
		echo $now >"$TS_FILE"
	fi
fi

{
	printf 'percentage=%s%%\nicon=' $cap
	if [ $status = Charging ]; then
		echo "󰂄"
	elif [ $cap -ge 90 ]; then
		echo "󰁹"
	elif [ $cap -ge 80 ]; then
		echo "󰂂"
	elif [ $cap -ge 70 ]; then
		echo "󰂁"
	elif [ $cap -ge 60 ]; then
		echo "󰁿"
	elif [ $cap -ge 50 ]; then
		echo "󰁾"
	elif [ $cap -ge 40 ]; then
		echo "󰁽"
	elif [ $cap -ge 30 ]; then
		echo "󰁼"
	elif [ $cap -ge 20 ]; then
		echo "󰁻"
	elif [ $cap -ge 10 ]; then
		echo "󰁺"
	else
		echo "󰂎"
	fi
} | jo