#!/usr/bin/env fish
# listen to battery state and warn on low battery

# read low battery state level from environment and fallback to a value of 8
set LOW 8
test -n "$BAT_CRITICAL_LEVEL" -a "$BAT_CRITICAL_LEVEL" -gt 0; and set LOW "$BAT_CRITICAL_LEVEL"

# read config from environment
set ALARM_TEMP 1000
test -z "$BAT_ALARM_TEMP" -a "$BAT_ALARM_TEMP" -gt 1000; and set ALARM_TEMP "$BAT_ALARM_TEMP"

# if we are currently below or above our LOW threshold
set isLow "false"

# print config
echo "Set up with LOW=$LOW and ALARM_TEMP=$ALARM_TEMP"
#echo "redshift="(which redshift)

function check_btry
	set state (upower -i /org/freedesktop/UPower/devices/battery_BAT0 | rg "(percent|state)" | awk -F " " '{print $2}')
	
	set charge (echo "$state[2]" | string replace "%" "")
	set state "$state[1]"

	set c_low (test "$charge" -lt "$LOW"; and echo true; or echo false)

	if test $c_low = true; and test $state = discharging; and test $isLow != true
		echo "transitioning to low battery state"
		low_btry_action
		set isLow true
	else if test ! $state = discharging; and test $isLow != false
		echo "transtioning to high bat state (charger)"
		set isLow false
		high_btry_action
	else if test $c_low = false; and test $isLow != false
		echo "transitioning to high bat state (magic)"
		set isLow false
		high_btry_action
	end
end


function low_btry_action
	# kill redshift job and set fixed alarm temp
	if jobs -q
		echo killing redshift with pid (jobs -p)
		kill (jobs -p)
	end
	redshift -P -O "$ALARM_TEMP"
end

function high_btry_action
	# start redshift again
	
	redshift -P -l 50.11552:8.68417 -t 5500:2500 &
end


if test "$argv[1]" = once
	check_btry

	set state (upower -i /org/freedesktop/UPower/devices/battery_BAT0 | rg "(percent|state)" | awk -F " " '{print $2}')

        set charge (echo "$state[2]" | string replace "%" "")
        set state "$state[1]"

	echo "$charge : $state"
else
	#set percent (upower -i /org/freedesktop/UPower/devices/battery_BAT0 | rg "(percent)" | awk -F " " '{print $2}' | string replace "%" "")

	# set initial isLow variable to the opposite of what it's supposed to be to trigger a 
	#test "$percent" -lt "$LOW"; and set isLow "false"
	set isLow unknown

	sleep 5

	while true
		check_btry
		sleep (test $isLow = true; and echo 1; or echo 60)
	end
end