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

let
  flatpakConfPath  = ../../../assets/system/apps/flatpaks.conf;
  enableProgram    = config.enableFlatpaks or false;
in
{
  options.enableFlatpaks = lib.mkEnableOption "Enable automatic Flatpak installation";

  config = lib.mkIf enableProgram {

    myApps.flatpaks = {
      enable    = true;
      user      = config.defaultUser or "henrov";
      assetsDir = flatpakConfPath;
      files     = [];
    };

    environment.etc."flatpak/flatpaks.conf".source = flatpakConfPath;

    services.flatpak.enable = true;
    xdg.portal.enable = true;

    systemd.services.flatpak-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="${flatpakConfPath}"
          if ! flatpak remotes --system --columns=name | grep -qx flathub; then
            flatpak remote-add --system --if-not-exists flathub https://dl.flathub.org/repo/flathub.flatpakrepo
          fi
          while IFS= read -r app || [ -n "$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 = [ flatpakConfPath ];
      path = [ pkgs.flatpak pkgs.coreutils pkgs.gnugrep pkgs.gnused ];
    };
  };
}