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

let
  # Module name
  moduleName = "flatpaks";

  # Top-level toggle for this module
  enableProgram = config.enableFlatpaks or false;

  # Path to your Flatpak list
  assetPath = ../../../assets/system/apps/flatpaks.conf;

  # Resolve user safely
  username = config.defaultUser or "henrov";
in
{
  # --- Top-level toggle option ---
  options.enableFlatpaks = lib.mkEnableOption "Enable automatic Flatpak installation";

  # --- Config only applied if enabled ---
  config = lib.mkIf enableProgram {

    # Deploy the Flatpak conf file
    environment.etc."flatpak/flatpaks.conf".source = assetPath;

    # Enable system Flatpak service
    services.flatpak.enable = true;
    xdg.portal.enable = true;

    # Systemd service to install Flatpaks from the list
    systemd.services."${moduleName}-sync" = {
      description = "Install Flatpak apps listed in flatpaks.conf";
      wantedBy    = [ "multi-user.target" ];
      wants       = [ "network-online.target" ];
      after       = [ "network-online.target" ];

      serviceConfig = {
        Type = "oneshot";
        ExecStart = ''
          set -euo pipefail
          CONF="${assetPath}"

          # Add Flathub if not present
          if ! flatpak remotes --system --columns=name | grep -qx flathub; then
            flatpak remote-add --system --if-not-exists flathub https://dl.flathub.org/repo/flathub.flatpakrepo
          fi

          # Install every Flatpak listed in the conf file
          while IFS= read -r app || [ -n "$app" ]; do
            app=$(echo "$app" | sed 's/#.*//;s/^[[:space:]]*//;s/[[:space:]]*$//')
            if [ -n "$app" ]; then
              if ! flatpak info --system "$app" >/dev/null 2>&1; then
                flatpak install --system -y --noninteractive flathub "$app"
              fi
            fi
          done < "$CONF"
        '';
      };

      restartTriggers = [ assetPath ];

      # Include only the packages needed for this service
      path = [ pkgs.flatpak pkgs.coreutils pkgs.gnugrep pkgs.gnused ];
    };
  };
}