# Edit this configuration file to define what should be installed on
# your system.  Help is available in the configuration.nix(5) man page
# and in the NixOS manual (accessible by running ‘nixos-help’).

{ config, pkgs, modulesPath, ... }:


{

  # Import NixOS QEMU guest profile for optimal virtio support
  imports = [
    "${modulesPath}/profiles/qemu-guest.nix"
  ];

  # boot.loader.grub.device = "/dev/vda";
  # fileSystems."/" = {
  #   device = "/dev/vda1";
  #   fsType = "ext4";
  # };

  boot.kernelParams = [
    "console=ttyS0,115200"
    "console=tty1"
  ];

  # QEMU guest agent for VM management (memory stats, filesystem freeze, etc.)
  services.qemuGuest.enable = true;

  systemd.services."serial-getty@ttyS0" = {
    enable = true;
    wantedBy = [ "getty.target" ]; # to start at boot
    serviceConfig.Restart = "always"; # restart when session is closed
  };



  # network and proxy
  networking.hostName = "minimal";
  networking.networkmanager.enable = true;

  # Set your time zone.
  time.timeZone = "Europe/Stockholm";

  # Select internationalisation properties.
  i18n.defaultLocale = "sv_SE.UTF-8";
  console = {
    font = "Lat2-Terminus16";
    keyMap = "sv-latin1";
  };


  # Define a user account. Don't forget to set a password with ‘passwd’.
  security.sudo.wheelNeedsPassword = false;
  programs.zsh.enable = true;
  users.mutableUsers = true;
  users.users.kalle = {
    isNormalUser = true;
    initialHashedPassword = "$6$92TJx1rnVZ8ZBWGk$.0CUy9wLNbfNdmkwhnQCOomFiy.oJA2bSzLOixoQS3UyV/BITD55IhEVfr05VUVJtjcUoVIE1We99qEAWAbkE/";
    shell = pkgs.zsh;
    extraGroups = [ "wheel" "docker" "networkmanager" "video" "audio" ]; # Enable ‘sudo’ for the user.
    packages = with pkgs; [

      # common sense
      zsh
      tmux
      fzf
      fzf-zsh
      bat
      fd

    ];
  };

  # system packages
  environment.systemPackages = with pkgs; [

    # basic stuff
    vim
    btrfs-progs

    # net
    wireguard-tools
    inetutils
    wget
    mosh
    rsync
    git

  ];



  # List services that you want to enable:

  # Enable the OpenSSH daemon.
  services.openssh.enable = true;

  # Auto-grow root filesystem on boot (for live disk resize support)
  # Works with VIRTIO-SCSI (/dev/sda) - detects partition layout automatically
  systemd.services.auto-grow-root = {
    description = "Auto-grow root filesystem";
    wantedBy = [ "multi-user.target" ];
    after = [ "local-fs.target" ];
    serviceConfig = {
      Type = "oneshot";
      RemainAfterExit = true;
    };
    path = with pkgs; [ cloud-utils parted e2fsprogs btrfs-progs util-linux ];
    script = ''
      set -euo pipefail

      ROOT_DEV=$(findmnt -n -o SOURCE /)
      ROOT_DISK=$(lsblk -no PKNAME "$ROOT_DEV" | head -1)

      # If partitioned, grow partition first
      if [[ "$ROOT_DEV" =~ [0-9]$ ]]; then
        PART_NUM=$(echo "$ROOT_DEV" | grep -oE '[0-9]+$')
        growpart "/dev/$ROOT_DISK" "$PART_NUM" 2>/dev/null || true
      fi

      # Grow filesystem
      FSTYPE=$(findmnt -n -o FSTYPE /)
      case "$FSTYPE" in
        ext4) resize2fs "$ROOT_DEV" 2>/dev/null || true ;;
        btrfs) btrfs filesystem resize max / 2>/dev/null || true ;;
      esac
    '';
  };


  # This value determines the NixOS release from which the default
  # settings for stateful data, like file locations and database versions
  # on your system were taken. It‘s perfectly fine and recommended to leave
  # this value at the release version of the first install of this system.
  # Before changing this value read the documentation for this option
  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
  system.stateVersion = "25.05"; # Did you read the comment?

}