#!/usr/bin/env sh

######################################################################
# @author      : swytch (adapted from Luke Smith - lukesmith.xyz)
# @file        : sb-battery
# @license     : GPLv3
# @created     : Saturday Feb 13, 2021 17:19:04 CET
#
# @description : battery block dwmblocks
######################################################################


# Will show all batteries with approximate icon for remaining power.
# Or show that the computer is plugged to a power source
# In any case, show the remaining battery percentage
# Also sends a notification if battery running low

time="$XDG_STATE_HOME/batteryupdate"
notify() { \
	now=$(date +%s)
	if [ -e $time ]; then
		old=$(cat $time)
		delta=$(expr $now - $old)
	else
		delta=$now
	fi
	[ 300 -gt $delta ] && return;
	echo $now > $time
	case "$capacity" in
		2[0-9]) notify-send -u "normal" "Battery is running low ($capacity%)" "Please plug your computer to a power source" ;;
		*) notify-send -u "critical" "Battery is dangerously low ($capacity%)" "Please plug your computer to a power source - <b>NOW!</b>" ;;
	esac
	}

total=0
for bat in /sys/class/power_supply/BAT?/
do
	status="$(cat "$bat/status")"
	capacity="$(cat "$bat/capacity")"
        total="$(expr $total + $capacity)"
        slot="$(basename $bat)"
	if [ "Full" = "$status" ]; then
		status=" " && capacity="FULL"
                printf " %s:%s(%s) " "$slot" "$status" "$capacity"
        else
                if [ 100  -lt $(expr $capacity) ]; then
                        status=""
                else
                        if [ "$status" = "Charging" ]; then
                                status=""
                        else
                                case "$capacity" in
                                        100|[8-9][0-9])	status="" ;;
                                        [6-7][0-9])	status="" ;;
                                        [4-5][0-9])	status="" ;;
                                        [2-3][0-9])	status="" ;;
                                        *)	status="" ;;
                                esac
                                [ "BAT0" = $slot ] && [ 30 -gt $capacity ] && notify;
                        fi
                        printf " %s:%s (%0.2d%%) " "$slot" "$status" "$capacity";
                fi
        fi
done