parse_arguments()
{
	FORCE=0
	while getopts ":fh" o; do
		case $o in
		f) FORCE=1;;
		h) help && exit 0;;
		\?) usage && exit;;
		esac
	done
	shift $(( $OPTIND - 1 ))
	
	if [ $# -eq 1 ]; then
		MODE=default
	elif [ $# -eq 5 ] && [ $FORCE -ne 1 ]; then
		MODE=manual
	else
		usage && exit
	fi
	DEVICE="$1"
	check_device
	DEVICE_SIZE=$(blockdev --getsize64 "${DEVICE}")
	RAM_SIZE=$(kibibytes_to_bytes $(grep MemTotal: /proc/meminfo | awk '{print $2}'))
	$MODE $@
}

default()
{
	MIN_SIZE=$(( $(gibibytes_to_bytes 100) + $RAM_SIZE + 2 ))
	echo "min size: $MIN_SIZE"
	BEST_SIZE=$(( $(gibibytes_to_bytes 200) + 2 * $RAM_SIZE ))
	echo "best size: $BEST_SIZE"

	if [ $DEVICE_SIZE -lt $MIN_SIZE ]; then
		fatal ${MINSIZE_E} "to use default mode, the disk must have at least $(bytes_to_gibibytes ${MIN_SIZE})GB".
	elif [ $DEVICE_SIZE -lt $BEST_SIZE ] && [ $FORCE -ne 1 ]; then
		fatal ${BESTSIZE_E} "to use default mode, it is reccomended that the disk have at least $(bytes_to_gibibytes ${BEST_SIZE})GB. If you know what you are doing, you can force default mode with -f".
	fi
	VM_SIZE=$(gibibytes_to_bytes 100)
	SWAP_SIZE=$(( $RAM_SIZE + $(gibibytes_to_bytes 1) ))
	FREE_SIZE=$(( ( $DEVICE_SIZE - $VM_SIZE - $SWAP_SIZE ) / 10 ))
	CONDOR_SIZE=$(( ( $DEVICE_SIZE - $FREE_SIZE ) / 10 * 4 ))
	TEMP_SIZE=$(( ( $DEVICE_SIZE - $FREE_SIZE ) / 10 * 6 ))
}

manual()
{
	TEMP_SIZE=$(gibibytes_to_bytes $2)
	CONDOR_SIZE=$(gibibytes_to_bytes $3)
	SWAP_SIZE=$(gibibytes_to_bytes $4)
	VM_SIZE=$(gibibytes_to_bytes $5)
	if [ $(( $TEMP_SIZE + $CONDOR_SIZE + $SWAP_SIZE + $VM_SIZE )) -gt $DEVICE_SIZE ]; then
		fatal ${MANUALSIZE_E} "can't use this sizes: ${DEVICE} has only $(bytes_to_gibibytes ${DEVICE_SIZE})G"
	fi
}