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

let
  username     = config.defaultUser or "henrov";
  homeDir      = "/home/${username}";
  wallpaperSrc = "${flakeRoot}/assets/traveldroid/Wallpapers";
  wallpaperDst = "${homeDir}/Wallpapers";
  scriptFile   = "${homeDir}/Wallpapers/scripts/set-wallpapers-at-logon.sh";
in
{
  # Make bash available
  environment.systemPackages = [ pkgs.bash pkgs.rsync pkgs.jq pkgs.swww pkgs.waypaper ];

  # Create the copy script using Home Manager, following Waybar style
  home-manager.users = {
    ${username} = {
      home.file = {
        "copy-wallpapers.sh" = {
          text = ''
            #!/usr/bin/env bash
            set -e
            echo "Copying wallpapers from ${wallpaperSrc} to ${wallpaperDst} ..."

            if [ ! -d "${wallpaperSrc}" ]; then
              echo "ERROR: ${wallpaperSrc} does not exist"
              exit 1
            fi

            mkdir -p "${wallpaperDst}"

            # Simple copy, overwrite everything
            cp -r "${wallpaperSrc}/." "${wallpaperDst}/"

            # Fix permissions
            chmod -R u+rwx "${wallpaperDst}"

            echo "Done copying wallpapers."
          '';
          executable = true;
          force = true;
        };
      };
    };
  };

  # User service to run the script
  systemd.user.services.copyWallpapers = {
    description = "Copy wallpapers from repo to ~/Wallpapers";
    after       = [ "graphical-session.target" ];
    wants       = [ "graphical-session.target" ];

    serviceConfig = {
      Type      = "oneshot";
      ExecStart = "${homeDir}/copy-wallpapers.sh";
      Restart   = "no";
    };

    wantedBy = [ "default.target" ];
  };

  ############################
  # User service to run wallpaper script
  ############################
  systemd.user.services.wallpaperAtLogon = {
    description = "Run wallpaper logon script";
    after       = [ "graphical-session.target" ];
    wants       = [ "graphical-session.target" ];

    serviceConfig = {
      Type      = "oneshot";
      ExecStart = scriptFile;
      Restart   = "no";
    };

    wantedBy = [ "default.target" ];
  };

  ############################
  # Timer to run the script at login and every 15 minutes
  ############################
  systemd.user.timers.wallpaperAtLogonTimer = {
    description = "Run wallpaper script at login and every 15 minutes";
    wantedBy   = [ "timers.target" ];

    timerConfig = {
      OnBootSec         = "1min";   # run 1 minute after login
      OnUnitActiveSec   = "15min";  # repeat every 15 minutes
      Persistent        = true;     # catch up missed runs
    };
  };

  ############################
  # Random background per workspace at boot
  ############################

  systemd.user.services.workspaceWallpapers = {
    description = "Dynamic wallpapers per workspace for Hyprland";
    after = [ "graphical-session.target" ];
    wants = [ "graphical-session.target" ];

    serviceConfig = {
      ExecStart = "${HOME}/Wallpapers/scripts/workspace-wallpapers.sh";
      Restart = "always";
    };

    wantedBy = [ "default.target" ];
  };
}