#! /usr/bin/env dash
# shellcheck disable=SC2086
# shellcheck source=/dev/null
. %SHELL_LIBRARY_PATH
export LIB_TEMP_DIR_FOR_SCRIPT="$(mktemp -d)"
bsc() {
    msg2 "$(btrfs subvolume create "$1" || dien "Creating of subvol $1")";
}

mne() {
    mount --mkdir --options compress-force=zstd:15,subvol="$1" $DISK_ROOT "$2" || dien "Mounting of $1";
}


available_disks="$(mktmp)";
lsblk -J | jq '.[] | map(.name) | [foreach .[] as $item ({item: null, index: -1}; {$item, index: (.index + 1)})]' > $available_disks;


[ "$(jq '.[]' "$available_disks" | wc -l)" -eq 0 ] && die "No disks found"
msg "Select a disk to format:\n"

i=9999; # nobody will have so many disks attached

while ! jq -e --argjson i "$i" '.[$i]' "$available_disks" > /dev/null 2>&1; do
    for disk in $(jq -c '.[]' "$available_disks" ); do
        printf "%4s) %s \n" "$(echo "$disk" | jq '.index')" "$(echo "$disk" | jq '.item' | tr -d "\"")";
    done
    printf "%4s) Exit\n" "q"
    readp  "Enter a option: " disk

    if [ $disk = "q" ];then
        exit 1
    else
        i="$disk"
    fi
    if jq -e --argjson i "$i" 'nth($i)' "$available_disks"  > /dev/null 2>&1; then
        disk=$(mktmp);
        jq -e --argjson i "$i" 'nth($i)' "$available_disks" > "$disk";
    else
        warning "No disk selected. Select a disk to continue.\n"
    fi
done

readp "Do you really want to delete all data on disk $(jq '.item' "$disk")? [N/y]: " result
case $result in
    [Yy])
        msg "Great, deleting everything..."
        disk="$(jq '.item' "$disk" | tr -d "\"")"
        ;;
    *)
        msg "Sure, keep your data"
        exit 1
        ;;
esac

sgdisk -Z "/dev/${disk}" > /dev/null|| dien "Zapping"

sgdisk -n 1:0:+550M -n 2:0:"$ENDSECTOR" -t 1:ef00 -t 2:8300 "/dev/${disk}" > /dev/null|| dien "Partitioning"

case "$disk" in
    "nvme"*)
        export DISK_EFI="/dev/${disk}"p1
        export DISK_ROOT="/dev/${disk}"p2
        ;;
    "sd"* |"vd"*)
        export DISK_EFI="/dev/${disk}"1
        export DISK_ROOT="/dev/${disk}"2
        ;;
    *)
        die "The disk type: ${disk} is not yet supported!"
        ;;
esac

msg "Started Formatting..."
mkfs.fat -F32 "$DISK_EFI" > /dev/null || dien "Formatting(fat32)"
mkfs.btrfs -f "$DISK_ROOT" > /dev/null || dien "Formatting(btrfs)"


msg "Mounting..."
mount -t btrfs $DISK_ROOT /mnt
cd /mnt || die "(Bug): no /mnt"
bsc nix-store
bsc persistent-storage
bsc persistent-storage/nixos-config
bsc persistent-storage/.snapshots
cd /
umount -R /mnt
mount -t tmpfs none /mnt
mount --mkdir "$DISK_EFI" /mnt/boot

mne nix-store /mnt/nix
mne persistent-storage /mnt/srv

mount --mkdir --options bind /mnt/srv/nixos-config /mnt/etc/nixos

msg "Finished mounting and generating btrfs subvolumes"

readp "Do you want to continue with nixos-install? [N/y]: " result
case $result in
    [Yy])
        nix run "git+https://git.sils.li/ene/nixos-config#setup";
        ;;
    *)
        msg "Sure, do it yourself"
        exit 1
        ;;
esac
if [ -d "$LIB_TEMP_DIR_FOR_SCRIPT" ];then rm -r "$LIB_TEMP_DIR_FOR_SCRIPT"; fi