#!/bin/sh

BAT_PATH="/sys/class/power_supply/BAT0"
CAPACITY=$(cat "$BAT_PATH/capacity")
STATUS=$(cat "$BAT_PATH/status")

notify() {
    dunstify -u critical -r 999 "⚡ Battery low: $1%" "Plug in your charger NOW!"
}

if [ "$STATUS" != "Charging" ]; then
    if [ "$CAPACITY" -le 5 ]; then
        notify 5
    elif [ "$CAPACITY" -le 10 ]; then
        notify 10
    elif [ "$CAPACITY" -le 20 ]; then
        notify 20
    elif [ "$CAPACITY" -le 30 ]; then
        notify 30
    fi
fi