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

let
  username     = config.defaultUser or "henrov";
  homeDir      = "/home/${username}";
  wallpaperDst = "${homeDir}/Wallpapers";
  wallpaperSrc = "${flakeRoot}/assets/traveldroid/Wallpapers";
in
{
  ############################
  # Packages
  ############################
  environment.systemPackages = with pkgs; [
    swww
    waypaper
    jq
    rsync
  ];

  ############################
  # Service (does the work)
  ############################
  systemd.user.services.wallpaperUpdater = {
    description = "Sync wallpapers and apply them";
    after = [ "default.target" ];

    serviceConfig = {
      Type = "oneshot";
      ExecStart = ''
        # Create destination folder
        mkdir -p ${wallpaperDst}

        # Copy FULL folder contents (mirror)
        rsync -a --delete ${wallpaperSrc}/ ${wallpaperDst}/

        # Ensure script is executable
        chmod +x ${wallpaperDst}/set-wallpapers-per-workspace.sh

        # Run script
        ${wallpaperDst}/set-wallpapers-per-workspace.sh
      '';
    };
  };

  ############################
  # Timer (runs every 15 min)
  ############################
  systemd.user.timers.wallpaperUpdater = {
    description = "Run wallpaper updater every 15 minutes";

    wantedBy = [ "timers.target" ];

    timerConfig = {
      OnBootSec = "2min";          # run shortly after login
      OnUnitActiveSec = "15min";   # repeat every 15 min
      Persistent = true;
    };
  };
}