#! @bash@/bin/sh

set -e

# e.g /dev/nvme0n1
DRIVE_PATH=$1
KEY_FILE=$2
TEMP_MOUNTPOINT=$3

if echo "$DRIVE_PATH" | grep -q "[0-9]$"; then
    PARTITION_SEPARATOR="p"
else
    PARTITION_SEPARATOR=""
fi

if [ -z "$DRIVE_PATH" ]; then
  echo "Please specify a path to device as first argument"
  exit 1
fi

if [ -z "$KEY_FILE" ]; then
  echo "Please specify a key file to use"
  exit 1
fi

if [ -z "$TEMP_MOUNTPOINT" ]; then
  echo "Please specify a temp mountpoint to use"
  exit 1
fi

if [ "$EUID" -ne 0 ]; then
  echo "Please run as root"
  exit
fi

# encrypted partition label
ENCRYPTED_LABEL=@ENCRYPTED_LABEL@
# unencrypted filesystem label
UNENCRYPTED_LABEL=@UNENCRYPTED_LABEL@

echo "Wiping Partitions..."
@util-linux@/bin/wipefs --all ${DRIVE_PATH}

echo "Creating Encrypted Partition"
@cryptsetup@/bin/cryptsetup luksFormat "${DRIVE_PATH}" --key-file "${KEY_FILE}" --label "${ENCRYPTED_LABEL}"

echo "Opening Encrypted Partition"
@cryptsetup@/bin/cryptsetup open "${DRIVE_PATH}" "mk-raspberry-ext-drive" --key-file "${KEY_FILE}"

echo "Formatting Encrypted Filesystem"
@btrfs-progs@/bin/mkfs.btrfs -L "${UNENCRYPTED_LABEL}" /dev/mapper/mk-raspberry-ext-drive

echo "Mounting Partition"
mount -t btrfs /dev/mapper/mk-raspberry-ext-drive "$TEMP_MOUNTPOINT"

echo "Creating Folders"
mkdir "$TEMP_MOUNTPOINT/backups"
mkdir "$TEMP_MOUNTPOINT/storage"
mkdir "$TEMP_MOUNTPOINT/extras"

echo "Unmounting"
umount "$TEMP_MOUNTPOINT"

echo "Closing mapper device"
@cryptsetup@/bin/cryptsetup close "mk-raspberry-ext-drive"