#!/bin/bash
backupcfg="/etc/backup.cfg"

if [ $UID -ne 0 ]; then
	echo "Keine Rootrechte."
	exit 1
fi

input() {
        output=""
        echo "${1}"
        read -r -p "[${2}]: " output
        test -z "${output}" && output="${2}"
        return 0
}

multiplechoice() {
        output=""
        local done=""
        local input=("${@}")
        #for i in $(seq 1 "$(( ${#input[@]} - 1 ))"); do
        for i in $(seq 0 "$(( ${#input[@]} - 1 ))"); do
                if [[ "${i}" == "0" ]]; then
                        choices="${input[$i]}"
                        use="${input[$i]}"
                else
                        choices="${choices}|${input[$i]}"
                        use+=" ${input[$i]}"
                fi
        done
        while input "[${choices}]: " "${input[0]}"; do
                for i in $(seq 0 "${#input[@]}"); do
                        if [[ "${output}" == "${input[$i]}" ]] || [[ "${output}" == "${input[$i]:0:2}" ]]; then
                                output="${input[$i]}"
                                done=1
                        fi
                done
                if [[ -z "${done}" ]]; then
                        echo wronginput "${output}"
                        echo use these: "${use}"
                else
                        break
                fi

        done
}

clear
echo "Bitte Backupgerät noch nicht anschliessen oder wieder entfernen!"
echo "Dücke Enter"
read
DISKS_DETAILS=$(lsblk -l -o KNAME,TYPE,SIZE,MODEL|grep disk)
echo "${DISKS_DETAILS}"
echo ""
echo "Nun das Gerät anschliessen"
echo "Vergleiche diese Ausgabe mit der folgenden"
echo "Drücke Enter"
read
DISKS_DETAILS=$(lsblk -l -o KNAME,TYPE,SIZE,MODEL|grep disk)
echo "${DISKS_DETAILS}"
echo ""
echo "Welches kam neu hinzu?"
DIFF=$(diff <(echo "$a") <(echo "$b")|tail -n-1|awk '{print $2}')
echo "Vermutlich '${DIFF}'"
multiplechoice $(echo "${DISKS_DETAILS}"|awk '{print $1}')
TARGET_PHY_DISK="${output}"


parted "${TARGET_PHY_ID}" -s -- mklabel gpt
parted "${TARGET_PHY_ID}" unit mib -s -- mkpart root btrfs 1 100%

UUID=$(blkid -o value -s UUID "/dev/${TARGET_PHY_ID}1")

if ! cryptsetup luksFormat UUID="${UUID}"; then
	echo "Konnte /dev/disk/by-uuid/${UUID} nicht verschluesseln."
	exit 1
else
	if ! cryptsetup open UUID="${UUID}" "luks-${UUID}"; then
		echo "Konnte /dev/disk/by-uuid/${UUID} nicht verschluesseln."
		exit 1
	fi
fi

if ! mkfs.btrfs -f "/dev/mapper/luks-${UUID}"; then
	echo "Konnte /dev/mapper/luks-${UUID} nicht formatieren"
	exit 1
fi

cryptsetup close "luks-${UUID}"

echo "UUID=\"${UUID}\"" > "${backupcfg}"

echo "Erstellen des Containers fertig."