const fs=require("fs");
const path=require("path");

const root=path.resolve(__dirname,"..");
const appJs=fs.readFileSync(path.join(root,"static/js/app.js"),"utf8");
const html=fs.readFileSync(path.join(root,"app.html"),"utf8");

// Catch the exact class of bug that caused the v3.7.5 black screen:
// a standalone `async` token before a normal function declaration.
const strayAsync=/(^|\n)\s*async\s*\n\s*function\s+[A-Za-z_$]/m;
if(strayAsync.test(appJs)){
  throw new Error("runtime guard: stray standalone async token found");
}

if(!/async function boot\s*\(\s*\)/.test(appJs)){
  throw new Error("runtime guard: async boot() missing");
}
if(!/\bboot\s*\(\s*\)\s*;/.test(appJs)){
  throw new Error("runtime guard: boot() is not invoked");
}
if(!/classList\.remove\(\s*["']auth-pending["']\s*\)/.test(appJs)){
  throw new Error("runtime guard: auth-pending removal missing");
}
if(!html.includes('id="sidebarToolsToggle"')){
  throw new Error("runtime guard: sidebar collapse control missing");
}
if(!appJs.includes("bindSidebarToolsToggle")){
  throw new Error("runtime guard: sidebar collapse binding missing");
}

// Parse the script as real JavaScript as an additional runtime-oriented gate.
// Using Function catches parse errors in the same JS engine that runs this test.
new Function(appJs);

console.log("[frontend-smoke] OK: boot guard, auth escape, sidebar binding, no stray async");