[ ! -L "$CONFIG"/wallpaper ] && ln -sf "$DEFAULT_WALLPAPER" "$CONFIG"/wallpaper
[ ! -f "$CONFIG"/mode ] && echo "$DEFAULT_MODE" > "$CONFIG"/mode

WALLPAPER=""
MODE=""

set_wallpaper() {
  if [ -f "$1" ]; then
    WALLPAPER="$1"
  else
    echo "Invalid wallpaper path: $1"
    exit 1
  fi
}

set_mode() {
  if [ "$1" = "light" ] || [ "$1" = "dark" ]; then
    MODE="$1"
  else
    echo "Invalid mode: $1. Use 'light' or 'dark'."
    exit 1
  fi
}

toggle_mode() {
  if [ "$(cat "$CONFIG"/mode)" = "light" ]; then
    MODE="dark"
  else
    MODE="light"
  fi
}

show_usage() {
  echo "Usage: theme {toggle|light|dark|mode <mode>|wallpaper <file> [mode]}"
}

finish() {
  [ -n "$WALLPAPER" ] && ln -sf "$WALLPAPER" "$CONFIG"/wallpaper
  [ -n "$MODE" ] && echo "$MODE" > "$CONFIG"/mode

  "$ACTIVATION" > /dev/null
}

if [ $# -eq 0 ]; then
  finish
else
  case "$1" in
    toggle)
      if [ $# -eq 1 ]; then
        toggle_mode
      else
        show_usage
        exit 1
      fi
      ;;
    light)
      if [ $# -eq 1 ]; then
        set_mode "light"
      else
        show_usage
        exit 1
      fi
      ;;
    dark)
      if [ $# -eq 1 ]; then
        set_mode "dark"
      else
        show_usage
        exit 1
      fi
      ;;
    mode)
      if [ $# -eq 2 ]; then
        set_mode "$2"
      else
        show_usage
        exit 1
      fi
      ;;
    wallpaper)
      if [ $# -ge 2 ] && [ $# -le 3 ]; then
        set_wallpaper "$2"
        [ $# -eq 3 ] && set_mode "$3"
      else
        show_usage
        exit 1
      fi
      ;;
    *)
      show_usage
      exit 1
      ;;
  esac

  finish
fi