# Atomic responsibility:
# - System-wide XDG basics
# - System-wide xdg-desktop-portal + chosen backends
# - A sane portals.conf selection (prevents “wrong backend” surprises)
#
# Notes:
# - Keep ALL portal-related config here (do not also configure xdg.portal in wm-hyprland.nix).
# - xdg.portal.config.common sets defaults via portals.conf(5) and is supported by NixOS. :contentReference[oaicite:0]{index=0}
# - If you enable xdg.portal.wlr.enable elsewhere, it auto-adds xdg-desktop-portal-wlr to extraPortals. :contentReference[oaicite:1]{index=1}
#   (We do NOT do that here because Hyprland typically uses xdg-desktop-portal-hyprland instead.)
# - xdg-desktop-portal-gtk is commonly needed for OpenURI/FileChooser support. :contentReference[oaicite:2]{index=2}

{ config, lib, pkgs, ... }:
{
  ##########################################################################
  # XDG basics (system)
  ##########################################################################
  xdg = {
    menus.enable = true;
    mime.enable  = true;
  };

  ##########################################################################
  # Portals (system)
  ##########################################################################
  xdg.portal = {
    enable = true;

    # Prefer Hyprland portal for compositor-integrated features (screensharing, etc),
    # and GTK for things like OpenURI/FileChooser compatibility.
    extraPortals = with pkgs; [
      xdg-desktop-portal-hyprland
      xdg-desktop-portal-gtk
    ];

    # Explicit portal routing via portals.conf (prevents “random backend chosen” issues).
    # This writes /etc/xdg/xdg-desktop-portal/portals.conf. :contentReference[oaicite:3]{index=3}
    config.common = {
      # Default backend order for interfaces where multiple backends exist.
      default = [ "hyprland" "gtk" ];

      # (Optional, but often helpful) Ensure GTK handles common UX portals reliably.
      "org.freedesktop.impl.portal.FileChooser" = [ "gtk" ];
      "org.freedesktop.impl.portal.OpenURI"     = [ "gtk" ];
    };
  };

  ##########################################################################
  # Environment defaults (system)
  ##########################################################################
  environment.sessionVariables = {
    # Encourage GTK apps to use portals for file picker / open-uri on Wayland.
    GTK_USE_PORTAL = "1";

    # Desktop identity hints used by some apps / portal logic.
    # (Set once here; don’t duplicate in HM and NixOS.)
    XDG_CURRENT_DESKTOP = "Hyprland";
    XDG_SESSION_DESKTOP = "Hyprland";
  };

  ##########################################################################
  # Optional: small, non-invasive tooling for troubleshooting
  ##########################################################################
  environment.systemPackages = with pkgs; lib.mkAfter [
    xdg-utils
  ];
}