{ pkgs, inputs, ... }:

# Workarounds specific to running home-manager on top of Guix System (as
# opposed to NixOS, or some other foreign distro). Keep this narrow -
# anything that would also apply to e.g. WSL belongs in ./foreign.nix
# instead.
{
  # Guix doesn't run a systemd user session the way home-manager expects,
  # so activation shouldn't try to start/restart systemd user units.
  systemd.user.startServices = false;

  # Guix Home's login shell (bash, via /etc/passwd) sources ~/.bash_profile
  # -> ~/.profile, which runs ~/.guix-home/setup-environment and
  # ~/.guix-home/on-first-login. The latter is what actually starts this
  # user's shepherd instance (which manages pipewire/pulseaudio and other
  # home services) if it isn't running yet. zsh has no equivalent of
  # ~/.profile, so with zsh as the login shell that chain never runs and
  # shepherd (and anything it starts, e.g. audio) never comes up. Replicate
  # it in .zprofile, which - like .bash_profile - only runs for login shells.
  programs.zsh.profileExtra = ''
    if [ -f "$HOME/.guix-home/setup-environment" ]; then
      HOME_ENVIRONMENT="$HOME/.guix-home"
      . "$HOME_ENVIRONMENT/setup-environment"
      "$HOME_ENVIRONMENT/on-first-login"
      unset HOME_ENVIRONMENT
    fi
  '';

  # gtk3.nix (see ../linux.nix's gtk.* config) mirrors GTK settings into
  # dconf, which needs a session D-Bus during activation. This host has no
  # /etc/dbus-1/session.conf and no session bus running at switch time, so
  # dconf's dbus-run-session activation step fails. GTK is still themed via
  # gtk-3.0/gtk-4.0 settings.ini; dconf mainly matters for GNOME/libadwaita
  # apps, which aren't in play here.
  dconf.enable = false;

  # Guix Home used to run gpg-agent as a shepherd service and export
  # SSH_AUTH_SOCK into the whole session before Hyprland started. That
  # service is disabled now, and zsh's SSH_AUTH_SOCK export (see
  # programs.zsh in common.nix) only reaches shells, not apps Hyprland
  # spawns directly - so launch the agent and push the socket path into
  # Hyprland's own env here instead. A NixOS host would have a real
  # systemd --user session doing this via gpg-agent.socket activation,
  # so this only belongs on Guix.
  wayland.windowManager.hyprland.extraConfig = ''
    exec-once = sh -c 'gpgconf --launch gpg-agent; hyprctl setenv SSH_AUTH_SOCK "$(gpgconf --list-dirs agent-ssh-socket)"'
  '';

  # base-system.scm enables pcscd-service-type, so pcscd already owns the
  # Yubikey's USB CCID interface. scdaemon's internal libusb CCID driver
  # then fails to open the device (`ccid open error: skip`) and doesn't
  # fall back to PC/SC on its own, so `gpg --card-status`/`--edit-card`
  # report "No such device". Force scdaemon through pcscd instead. A NixOS
  # host would only need this if it also runs services.pcscd itself.
  programs.gpg.scdaemonSettings.disable-ccid = true;

  home.packages = [
    # hyprlock built by nix needs Guix's PAM libs preloaded to authenticate
    # against Guix's PAM stack. Don't also preload Guix's libfontconfig.so
    # here: it's a "fontconfig-minimal" build that lacks symbols (e.g.
    # FcConfigSetDefaultSubstitute) which nix's pango expects, causing a
    # symbol lookup error at startup. Let hyprlock use nix's own fontconfig
    # from its normal closure instead.
    (pkgs.writeScriptBin "hyprlock" ''
      #! ${pkgs.bash}/bin/bash
      export LD_PRELOAD="/run/current-system/profile/lib/libpam.so.0:$LD_PRELOAD"
      exec ${pkgs.hyprlock}/bin/hyprlock "$@"
    '')

    # Guix's mesa doesn't match nixpkgs', so GL apps built by nix need nixGL.
    inputs.nixgl.packages.${pkgs.stdenv.hostPlatform.system}.nixGLIntel
  ];
}