#!/usr/bin/env python3
"""Add double-load guard to SatsSpin auth shim (prevents fetch recursion)."""
import io

P = "/opt/casino/dist/shim.js"
src = io.open(P, encoding="utf-8").read()
guard = "  if (window.__satsspinShimLoaded) { return; }\n  window.__satsspinShimLoaded = true;\n"
old = "(function () {\n  'use strict';\n"
assert old in src, "IIFE start not found"
if "__satsspinShimLoaded" not in src:
    src = src.replace(old, old + guard, 1)
    io.open(P, "w", encoding="utf-8").write(src)
    print("SHIM GUARDED")
else:
    print("ALREADY GUARDED")