#!/bin/env sh

# INIT
printf "$$" > ~/.cache/pidofbar
sec=0

# MODULES
update_cpu () { 
	cpu="  $(grep -o "^[^ ]*" /proc/loadavg )" 
}

update_memory () { 
	memory=" $(free -h --si | sed -n "2s/\([^ ]* *\)\{2\}\([^ ]*\).*/\2/p")"
}

update_time () { 
	time="$(date "+[   %a %d %b ] [   %I:%M %P ]")" 
}

update_music () {
    # music="[ $(sb-music) ] "
    if [ -z "$(sb-music)" ]; then
        music=""
    else
        music="[ $(sb-music) ]"
    fi
}

# update_bat () { 
# 	# you might need to change the path depending on your device
# 	read -r bat_status </sys/class/power_supply/BAT1/status
# 	read -r bat_capacity </sys/class/power_supply/BAT1/capacity
# 	bat="$bat_status $bat_capacity%"
# }

update_vol () { 
	vol="$([ "$(pamixer --get-mute)" = "false" ] && printf ' ' || printf ' ')$(pamixer --get-volume)%"
}

# For calcurse users, refer https://github.com/pystardust/automeet
#update_event () { 
#	event="$(calcurse -n | sed 1d | \
#		sed -E "s_^ *\[(.*):(.*)\] ([^\t]*)\t?.*_[\1h \2m->\3]_")" 
#	[ "[]" = "$event" ] && event=""
#}


# modules that don't update on their own need to be run at the start for getting their initial value
# update_vol

display () { 
	#printf "%s\n" " $event [$memory $cpu] [$bat] [$backlight] [$vol] $time "
	xsetroot -name "$music[ $vol ] [ $memory  $cpu ] $time "
}

# SIGNALLING
# trap	"<function>;display"		"RTMIN+n"
trap	"update_vol;display"		"RTMIN"
trap	"update_music;display"		"RTMIN+10"
# trap	"update_bat;display" 		"RTMIN+2"
# to update it from external commands
## kill -m "$(cat ~/.cache/pidofbar)"
# where m = 34 + n

while true
do
	sleep 1 & wait && { 
		# to update item ever n seconds with a offset of m
		## [ $((sec % n)) -eq m ] && udpate_item
		[ $((sec % 5 )) -eq 0 ] && update_time 	# update time every 5 seconds
		[ $((sec % 5 )) -eq 0 ] && update_vol # update vol every 5 seconds
		[ $((sec % 5 )) -eq 0 ] && update_music # update music every 5 seconds
		[ $((sec % 5)) -eq 0 ] && update_cpu 	# update cpu every 15 seconds
		[ $((sec % 5)) -eq 0 ] && update_memory
		# [ $((sec % 60)) -eq 0 ] && update_bat
		#[ $((sec % 300)) -eq 1 ] && update_event

		# how often the display updates ( 5 seconds )
		[ $((sec % 5 )) -eq 0 ] && display
		sec=$((sec + 1))
	}
done