{ pkgs, ... }:

{
  (pkgs.writeShellScriptBin "lock-screen" ''
    #!/usr/bin/env sh
    set -eu

    WALL="${1:-$HOME/Pictures/wallpaper.jpg}"
    TMP="/tmp/lockscreen.png"

    # Get current resolution (single-monitor friendly)
    RES=$(xrandr | awk '/\*/ {print $1; exit}')

    # Scale like feh --bg-fill
    convert "$WALL" \
      -resize "${RES}^" \
      -gravity center \
      -extent "$RES" \
      "$TMP"

    i3lock -i "$TMP"

  '')
}