{ pkgs, lib, modulesPath, ... }:

let
  nixfiles-auto-install = pkgs.writeScriptBin "nixfiles-auto-install" ''
    #!${pkgs.bash}/bin/bash
    set -euo pipefail

    hostname=host''${RANDOM}

    echo "[I] Deploying with hostname ''${hostname}"

    device=""
    for dev in ("/dev/vda" "/dev/sda"); do
      if [[ -b $dev ]]; then
        device=$dev
        break
      fi
    done

    while [[ $# -gt 0 ]]; do
      case $1 in
        --hostname)
          hostname=$2
          shift
          shift
          ;;
        *)
          echo "unknown option: $1"
          exit 1
          ;;
      esac
    done

    echo "[I] Formatting disk"

    if [[ -z $device ]]; then
      echo "[E] No device to install to"
      exit 1
    fi

    echo "[I] Using ''${device}"

    parted --script $device mklabel gpt
    parted --script $device disk_set pmbr_boot on

    parted --script $device mkpart boot 0% 512M
    parted --script $device set 1 bios_grub on

    parted --script $device mkpart root 512M 100%

    echo "[I] Creating file system"

    mkfs.ext4 -F ''${device}2

    echo "[I] Mount file system"

    mount ''${device}2 /mnt

    echo "[I] Generate NixOS configuration"

    nixfiles-generate-config --root /mnt --hostname ''${hostname}

    sed -i "s/\# boot\.loader\.grub\.device = \"/dev/sda\";/boot\.loader\.grub\.device = \"''${device}\";/g" /mnt/etc/nixos/hosts/''${hostname}/configuration.nix

    echo "[I] Install NixOS"

    nixos-install --flake /mnt/etc/nixos#''${hostname} --root /mnt --no-root-password
  '';
in {
  imports = [
    (modulesPath + "/installer/cd-dvd/installation-cd-base.nix")
  ];

  networking.hostName = "isowo";
  isoImage.isoBaseName = "nixos-isowo";

  environment.systemPackages = [
    nixfiles-auto-install
  ];
}