#!/usr/bin/env bash

dedicateduser=nixos

if [ "$(whoami)" != "${dedicateduser}" ]
then
    echo "Please execute this script as user nixos"
    exit 1
fi



cat > "/tmp/$(whoami)_sudo" << EOF
$(whoami) ALL = NOPASSWD: /usr/bin/mkdir * /nix
$(whoami) ALL = NOPASSWD: /usr/bin/chown $(whoami) /nix
$(whoami) ALL = NOPASSWD: /usr/sbin/groupadd -g 30000 nixbld
$(whoami) ALL = NOPASSWD: /usr/sbin/groupdel nixbld
$(whoami) ALL = NOPASSWD: /usr/bin/useadd -u 30000 -g nixbld -G nixbld nixbld
$(whoami) ALL = NOPASSWD: /usr/bin/userdel nixbld
$(whoami) ALL = NOPASSWD: /home/$(whoami)/.nix-profile/bin/nixos-generate-config --root /mnt/$(whoami)
$(whoami) ALL = NOPASSWD: /usr/sbin/chroot /mnt/$(whoami)*
$(whoami) ALL = NOPASSWD: /usr/sbin/debootstrap * /mnt/$(whoami)*
EOF

add_nixos_user()
{
    echo "# adduser $(whoami)"
    echo "And add sudo rights"
    echo "# cp /tmp/$(whoami)_sudo /etc/sudoers.d/$(whoami)"
}

if [ "$(whoami)" != "${dedicateduser}" ]
then
    echo "Please execute this script as user nixos"
    grep -q ${dedicateduser} /etc/passwd || add_sid_user
    exit 1
fi

if [ ! -d /nix ]
then
    sudo mkdir -m 0755 /nix
    sudo chown nixos /nix  
fi

if [ ! -d "${HOME}"/.nix-profile ]
then
    if ! curl -L https://nixos.org/nix/install | sh
    then
        echo "curl error"
        exit 1
    fi
fi

# shellcheck source=/dev/null
source "${HOME}"/.nix-profile/etc/profile.d/nix.sh

# nixpkgs https://channels.nixos.org/nixpkgs-unstable
if nix-channel --list | grep -q unstable
then
    if ! nix-channel --add https://channels.nixos.org/nixos-26.05 nixpkgs
    then
        echo "Channel add error"
        exit 1
    fi
    if ! nix-channel --update
    then
        echo "channel update error"
        exit 1
    fi
fi

if [ ! -x /home/nixos/.nix-profile/bin/nixos-generate-config ]
then
    if ! nix-env -f '<nixpkgs>' -iA nixos-install-tools
    then
        echo "tools installation error"
        exit 1
    fi
fi

if [ ! -d /mnt/"$(whoami)"/etc/nixos/configuration.nix ]
then
    if ! sudo /home/"$(whoami)"/.nix-profile/bin/nixos-generate-config --root /mnt/"$(whoami)"
    then
        echo "generate config error"
        exit 1
    fi
fi

if ! grep -q nixbld /etc/group
then
    if ! sudo groupadd -g 30000 nixbld
    then
        echo "groupadd error"
        exit 1
    fi
    if ! sudo useradd -u 30000 -g nixbld -G nixbld nixbld
    then
        echo "useradd error"
        exit 1
    fi
fi

# if ! grep "${target} ext" /etc/mtab
# then
#     echo "Error : mount partition under ${target}"
#     exit 1
# fi
# 
# if ! dpkg -l | grep "^ii  debootstrap"
# then
#     echo "Error: install debootstrap"
# fi
# 
# if [ ! -d "${target}/debootstrap" ]
# then
#     if ! sudo /usr/sbin/debootstrap sid "${target}" http://deb.debian.org/debian/
#     then
#         echo "Error: please check"
#     fi
# fi
# 
# if [ ! -e mount_chroot.sh ]
# then
#     echo "mount_chroot.sh absent"
#     echo "link it here"
#     exit 1
# fi
# 
# # shellcheck source=/dev/null
# source mount_chroot.sh "${target}"
# 
# echo "--- Creating the ${target}/etc/ Files"
# if ! grep " / " "${target}"/etc/fstab
# then
#     echo "--- Creating /etc/fstab"
#     FSTAB=${target}/tmp/fstab
#     if [ -e "${FSTAB}" ]
#     then
#         rm "${FSTAB}"
#     fi
#     blockdevice="$(mount |grep "${target} type ext4" |cut --delimiter=' ' --fields=1 |cut --delimiter='/' --fields=3)"
#     for link in /dev/disk/by-uuid/*
#     do
#         case $(readlink "${link}") in
#             *${blockdevice})
#                 blockuuid=$(basename "${link}")
#                 if [[ ! "${blockuuid}" =~ ^[a-zA-Z0-9-]+$ ]]
#                 then
#                     echo "Can't init /etc/fstab"
#                     echo "Fix it by ourself"
#                     exit 1
#                 else
#                     cat > "${FSTAB}" << EOSF
# UUID=${blockuuid}   /   ext4    defaults    0   0
# EOSF
#                 fi
#             ;;
#             *)
#                 continue
#             ;;
#         esac
#     done
#     if [ ! -e "${FSTAB}" ]
#     then
#         echo "Can't init /etc/fstab"
#         echo "Fix it by ourself"
#         exit 1
#     fi
#     swapuuid=$(lsblk --output UUID,MOUNTPOINTS |grep SWAP |head -1 |cut --delimiter=' ' --fields=1)
#     if [[ "${blockuuid}" =~ ^[a-zA-Z0-9-]+$ ]]
#     then
#         cat >> "${FSTAB}" << EOSF
# UUID=${swapuuid}   none     swap    sw  0   0
# EOSF
#         echo "The first swap partition found of the host was written in /etc/fstab"
#         echo "Fix it of you have/want another swap"
#     else
#         echo "Can't init swap /etc/fstab"
#         echo "Fix it by ourself"
#         exit 1
#     fi
#     echo "--- Creating /etc/adjtime"
#     cp --verbose /etc/adjtime "${target}"/tmp/adjtime
#     echo "--- Creating /etc/network/interfaces.d/lo.conf"
#     cat > "${target}"/tmp/lo.conf <<"EOSF"
# # The loopback network interface
# auto lo
# iface lo inet loopback
# EOSF
#     echo "--- Creating /etc/network/interfaces.d/eno1.conf"
#     cat > "${target}"/tmp/eno1.conf <<"EOSF"
# auto eno1
# iface eno1 inet dhcp
# EOSF
#     echo "--- Creating /etc/resolv.conf"
#     cp --verbose /etc/resolv.conf "${target}"/tmp/resolv.conf
#     echo "--- Creating /etc/hostname"
#     cp --verbose /etc/hostname "${target}"/tmp/hostname
#     echo "--- Creating /etc/hosts"
#     cp --verbose /etc/hosts "${target}"/tmp/hosts
#     echo "--- Creating /etc/locale.conf"
#     cp --verbose /etc/locale.conf "${target}"/tmp/locale.conf
#     echo "--- Creating /etc/default/keyboard"
#     cp --verbose /etc/default/keyboard "${target}"/tmp/keyboard
#     echo "--- Creating sudofile executable"
#     sudofile=/tmp/mnt_$(whoami)_etc_files.sh
#     cat > "${sudofile}" << "EOSF"
# cp --verbose /tmp/fstab /etc/fstab
# cp --verbose /tmp/adjtime /etc/adjtime
# cp --verbose /tmp/lo.conf /etc/network/interfaces.d/lo.conf
# cp --verbose /tmp/eno1.conf /etc/network/interfaces.d/eno1.conf
# cp --verbose /tmp/resolv.conf /etc/resolv.conf
# cp --verbose /tmp/hostname /etc/hostname
# cp --verbose /tmp/hosts /etc/hosts
# cp --verbose /tmp/locale.conf /etc/locate.conf
# cp --verbose /tmp/keyboard /etc/default/keyboard
# apt update
# echo "root:$(basename $(ls -1 /etc/s*w))" | chpasswd
# apt --yes install linux-image-amd64 ssh
# apt --yes install locales console-setup
# EOSF
#     echo "bash mount_chroot.sh ${target} ${sudofile}"
#     if ! bash mount_chroot.sh "${target}" "${sudofile}"
#     then
#         echo "Configuration error"
#         exit 1
#     fi
# 
# 
# fi