{ config, pkgs, inputs, lib, ... }:

{
  # Live-ISO defaults. The install.sh keymap step calls `hyprctl keyword
  # input:kb_layout` at runtime so the user's pick takes effect during the
  # install, and writes the chosen value into the *installed* system.
  console.keyMap = lib.mkDefault "us";
  i18n.defaultLocale = lib.mkDefault "en_US.UTF-8";
  services.xserver.xkb.layout = lib.mkDefault "us";

  # ISO Branding
  isoImage.volumeID = lib.mkForce "NOMARCHY_LIVE";
  isoImage.edition = lib.mkForce "graphical";

  # Home Manager activation for the nixos live user is provided by the
  # home-manager.nixosModules.home-manager module wired up in flake.nix.

  environment.systemPackages = with pkgs; [
    git
    gum
    alacritty
    parted
    btrfs-progs
    cryptsetup
    mkpasswd
    inputs.disko.packages.${pkgs.stdenv.hostPlatform.system}.disko
    (pkgs.makeDesktopItem {
      name = "install-nomarchy";
      desktopName = "Install Nomarchy";
      exec = "alacritty -e sudo /etc/install.sh";
      terminal = false;
      categories = [ "System" ];
    })
  ];

  # Ensure the live environment user has the necessary groups for graphical acceleration and audio
  users.users.nixos.extraGroups = [ "wheel" "video" "render" "audio" "networkmanager" ];

  # Graphics support for live environment.
  #
  # Force-loading every GPU driver in the initrd (amdgpu+radeon+nouveau+i915)
  # panics most machines — only one of them can claim the GPU and the others
  # explode. List them under `availableKernelModules` instead so udev only
  # loads the one that matches the present hardware. We still force the AMD
  # pair when Plymouth needs KMS early; `virtio_gpu` is auto-loaded when
  # we're booted in QEMU via nomarchy-test-live-iso.
  boot.initrd.availableKernelModules = [
    "amdgpu" "radeon" "nouveau" "i915" "virtio_gpu"
  ];
  services.xserver.videoDrivers = [ "amdgpu" "radeon" "nouveau" "modesetting" "fbdev" "virtio" ];

  environment.etc."install.sh" = {
    source = ../installer/install.sh;
    mode = "0755";
  };

  environment.etc."hardware-db.sh" = {
    source = ../installer/hardware-db.sh;
    mode = "0644";
  };

  environment.etc."disko-config.nix" = {
    source = ../installer/disko-config.nix;
  };

  environment.etc."nomarchy".source = inputs.self;

  # Embed the git revision the ISO was built from so install.sh can pin the
  # generated flake to the exact same commit. `inputs.self.rev` exists only
  # when the flake is built from a clean git tree; from a dirty worktree we
  # fall back to dirtyRev (which won't be resolvable by `git+https`, so the
  # installer treats it as "unpinned"). Empty file = unpinned.
  environment.etc."nomarchy-rev".text =
    if inputs.self ? rev then inputs.self.rev
    else "";

  # Auto-login to the graphical session
  services.displayManager.autoLogin.enable = true;
  services.displayManager.autoLogin.user = "nixos";

  # Allow passwordless sudo for the live user
  security.sudo.wheelNeedsPassword = false;

  # Override the upstream installer helpLine (says "NixOS", points nowhere
  # useful for us). Shown on every TTY before login and again as the MOTD.
  services.getty.helpLine = lib.mkForce ''

    Welcome to the Nomarchy live environment.

    To install Nomarchy:        sudo /etc/install.sh
    To preview the install:     sudo /etc/install.sh --dry-run
    To resume an interrupted run: sudo /etc/install.sh --resume

    The graphical session autologins as 'nixos' (no password).
    The 'nixos' and 'root' accounts have empty passwords.
  '';
}