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

let
  username     = config.defaultUser or "henrov";
  homeDir      = "/home/${username}";
  wallpaperDst = "${homeDir}/Wallpapers";
  scriptSrc    = "${flakeRoot}/assets/traveldroid/Wallpapers/set-wallpapers-per-workspace.sh";
in
{
  ############################
  # Packages
  ############################
  environment.systemPackages = with pkgs; [
    swww
    waypaper
    jq
  ];

  ############################
  # Copy Wallpapers and Script
  ############################
  systemd.user.services.copyWallpapers = {
    description = "Copy Wallpapers and script to home";
    after = [ "network.target" ];
    serviceConfig.Type = "oneshot";
    serviceConfig.ExecStart = ''
      mkdir -p ${wallpaperDst}
      cp -r ${flakeRoot}/assets/traveldroid/Wallpapers/* ${wallpaperDst}/
      chown -R ${username}:${username} ${wallpaperDst}
      chmod +x ${wallpaperDst}/set-wallpapers-per-workspace.sh
    '';
    enable = true;
  };

  ############################
  # Periodic wallpaper updater
  ############################
  systemd.user.services.wallpaperPerWorkspace = {
    description = "Set wallpapers per workspace every 15 minutes";
    after = [ "copyWallpapers.service" ];
    wants = [ "copyWallpapers.service" ];
    serviceConfig.Type = "simple";
    serviceConfig.ExecStart = "${wallpaperDst}/set-wallpapers-per-workspace.sh";
    install.WantedBy = [ "default.target" ];
  };

  systemd.user.timers.wallpaperPerWorkspace = {
    description = "Run wallpaper updater every 15 minutes";
    wantedBy = [ "timers.target" ];
    timerConfig = {
      OnBootSec    = "1min";
      OnUnitActiveSec = "15min";
      Persistent   = true;  # ensures catch-up if missed
    };
    unit = "wallpaperPerWorkspace.service";
    enable = true;
  };
}