#!/bin/sh

power_prefix="/sys/class/power_supply/"
[ -d "${power_prefix}sbs-20-000b" ] && bat="sbs-20-000b"

[ "$(ps aux | grep pulseaudio | wc -l)" -eq 2 ] && ss="pulse" || ss="alsa"

mod_bspwm () {
	used_desk=$(bspc query -D -d .occupied --names | tr '\n' ' ')
	current_desk=$(bspc query -D -d .focused --names)
	final_string=""
	current_printed=0
	
	for i in $used_desk; do
		[ "$i" = "$current_desk" ] && \
			final_string=${final_string}"*$i " && \
			current_printed=1 || \
			final_string=${final_string}"$i "
	done
	
	[ $current_printed -eq 0 ] &&
		final_string=${final_string}"*$current_desk "
	
	printf "%s" "$final_string"
}

mod_power () {
	tr -d '\n' < /sys/class/power_supply/$bat/capacity
}

mod_vol () {
	[ "$ss" = "pulse" ] && pactl list sinks | awk -F' ' '$1 == "Volume:" {print "pv" $5}'
	[ "$ss" = "alsa" ] && amixer | grep '^  Front' | awk -F'[' '{ORS = ""; print "av" substr($2, 1, 3); exit}'
}

mod_hello () {
	printf "HJi there"
}

update_mod () {
	output="$(eval "mod_$1")"
	eval "output_$1=\"$output\""
}

get_mod () {
	eval "printf '%s' \${output_$1}"
}

echo_bar () {
	left="$(get_mod "power") $(get_mod "vol") $(get_mod "bspwm")"
	right="$(get_mod "hello")"

	width="$(tput cols)"
	rightwidth="${#right}"

	# print left side
	printf "\033[2J\033[H%s" "$left"

	# print right side
	printf "\033[1;%if%s" "$(($width - $rightwidth + 1))" "$right"
}

register_sigs () {
	trap "update_mod vol" USR2
	trap "update_mod bspwm" USR1
}

update_all () {
	update_mod power
	update_mod vol
	update_mod bspwm
}

tput civis

register_sigs

update_mod power
update_mod vol
update_mod hello
update_mod bspwm

i=0
while true; do
	sleep 1
	[ "$i" -eq 29 ] && update_all && i=0
	echo_bar
done