import {chromium, firefox} from 'playwright';
import {createServer} from 'node:http';
import {once} from 'node:events';
import {readFile, writeFile} from 'node:fs/promises';
import {createHash} from 'node:crypto';
import assert from 'node:assert/strict';
const dir=new URL('.',import.meta.url);
const htmx=await readFile(new URL('node_modules/htmx.org/dist/htmx.js',dir));
let requests=[];
const observer=`window.probe=[];for(const name of ['htmx:afterSettle','htmx:historyRestore','htmx:responseError'])document.addEventListener(name,e=>window.probe.push({name,url:location.href,cacheMiss:e.detail.cacheMiss}));`;
const server=createServer((req,res)=>{
 const url=new URL(req.url,'http://localhost');
 const hx=req.headers['hx-request']==='true', restore=req.headers['hx-history-restore-request']==='true';
 let status=200,body='',representation='asset';
 res.setHeader('Cache-Control','no-store');
 if(url.pathname==='/htmx.js'){
  status=url.searchParams.has('fail')?503:200;body=status===200?htmx:'blocked enhancement';res.setHeader('Content-Type','application/javascript');
 }else if(url.pathname==='/observe.js'){body=observer;res.setHeader('Content-Type','application/javascript');}
 else if(['/articles','/cache-good','/cache-bad'].includes(url.pathname)){
  const topic=url.searchParams.get('topic')==='beta'?'beta':'alpha';
  const fail=url.searchParams.has('scriptfail')?'&scriptfail=1':'';
  const main=`<main id="content" hx-history-elt><h1>${topic}</h1><p id="article">Public article ${topic}</p><a id="next" href="${url.pathname}?topic=${topic==='alpha'?'beta':'alpha'}${fail}" hx-boost="true" hx-target="#content" hx-select="#content" hx-swap="outerHTML">Other topic</a><form action="${url.pathname}" method="get"><label>Topic <select name="topic"><option>alpha</option><option>beta</option></select></label><button>Filter</button></form><a id="broken" href="/articles?topic=beta&enhancedfail=1" hx-boost="true" hx-target="#content" hx-select="#content" hx-swap="outerHTML">Injected enhanced failure</a><a id="recover" href="/articles?topic=beta&enhancedfail=1">Native recovery</a></main>`;
  representation=hx&&!restore?'fragment':'full';
  const full=`<!doctype html><html lang="en"><head><meta charset="utf-8"><title>Public catalog</title><meta name="htmx-config" content='{"historyRestoreAsHxRequest":false}'><script src="/observe.js"></script><script src="/htmx.js${fail?'?fail=1':''}" defer></script></head><body><header id="shell">Catalog shell</header>${main}</body></html>`;
  body=representation==='full'?full:main;
  if(hx&&url.searchParams.has('enhancedfail')){status=503;body='Injected enhancement outage';}
  res.setHeader('Content-Type','text/html; charset=utf-8');
  if(url.pathname.startsWith('/cache-')){
   res.setHeader('Cache-Control','public, max-age=3600');
   const etag='"'+createHash('sha256').update(body).digest('hex')+'"';res.setHeader('ETag',etag);
   if(url.pathname==='/cache-good')res.setHeader('Vary','HX-Request, HX-History-Restore-Request');
   if(req.headers['if-none-match']===etag){status=304;body='';}
  }
 }
 else{status=404;body='Not found';}
 requests.push({path:req.url,hx,restore,ifNoneMatch:req.headers['if-none-match']||null,status,representation,vary:res.getHeader('Vary')||null,etag:res.getHeader('ETag')||null});
 res.writeHead(status);res.end(body);
});
server.listen(0,'127.0.0.1');await once(server,'listening');
const base=`http://127.0.0.1:${server.address().port}`;
const results=[], browsers={};
const output=process.env.FEP_RESULT_PATH||'/tmp/fep-navigation-result.json';
try{
 for(const [engine,launcher] of [['chromium',chromium],['firefox',firefox]]){
  const executablePath=engine==='chromium'?process.env.FEP_CHROMIUM_PATH:undefined;
  const browser=await launcher.launch({headless:true,...(executablePath?{executablePath}:{})});
  const binary=executablePath||launcher.executablePath();
  browsers[engine]={version:browser.version(),executable:binary,sha256:createHash('sha256').update(await readFile(binary)).digest('hex')};
  try{
   async function scenario(id,run,javaScriptEnabled=true){
    requests=[];const context=await browser.newContext({javaScriptEnabled});const page=await context.newPage();page.setDefaultTimeout(4000);
    const result={id,engine,status:'pass'};
    try{result.observation=await run(page,context);}catch(e){result.status='fail';result.error=e.message;}
    result.requests=[...requests];result.url=page.url();result.body=await page.locator('body').innerText().catch(()=>null);
    result.events=javaScriptEnabled?await page.evaluate(()=>window.probe||[]).catch(()=>[]):[];
    results.push(result);await context.close();
    await writeFile(output,JSON.stringify({status:'incomplete',results},null,2)+'\n');
   }
   async function selected(p,topic){await p.locator('h1').filter({hasText:topic}).waitFor();assert.equal(new URL(p.url()).searchParams.get('topic'),topic);}
   async function enhanced(p){await p.waitForFunction(()=>window.htmx?.version==='2.0.11');}
   async function next(p,topic){await p.locator('#next').click();await selected(p,topic);await p.waitForFunction(()=>window.probe.some(e=>e.name==='htmx:afterSettle'));}
   await scenario('N01-no-script-native',async p=>{
    await p.goto(base+'/articles?topic=alpha');await selected(p,'alpha');assert.equal(await p.locator('#shell').count(),1);
    await p.locator('#next').click();await selected(p,'beta');await p.locator('select').selectOption('alpha');await p.getByRole('button',{name:'Filter'}).click();await selected(p,'alpha');
    assert(requests.filter(r=>r.path.startsWith('/articles')).every(r=>!r.hx&&r.representation==='full'));return {directLinkAndGetForm:true,fullShell:true};
   },false);
   await scenario('N02-enhance-reload-direct',async(p,c)=>{
    await p.goto(base+'/articles?topic=alpha');await enhanced(p);await next(p,'beta');assert(requests.some(r=>r.hx&&r.representation==='fragment'));
    await p.reload();await selected(p,'beta');assert.equal(await p.locator('#shell').count(),1);
    const fresh=await c.newPage();await fresh.goto(base+'/articles?topic=beta');assert.equal(await fresh.locator('#shell').count(),1);await fresh.close();return {pushReloadAndFreshEntry:true};
   });
   await scenario('N03-history-hit',async p=>{
    await p.goto(base+'/articles?topic=alpha');await enhanced(p);await next(p,'beta');const before=requests.length;
    await p.goBack();await selected(p,'alpha');await p.waitForFunction(()=>window.probe.some(e=>e.name==='htmx:historyRestore'));
    await p.goForward();await selected(p,'beta');
    assert(!requests.slice(before).some(r=>r.path.startsWith('/articles')));return {backForward:true,additionalArticleRequests:0};
   });
   await scenario('N04-history-miss',async p=>{
    await p.goto(base+'/articles?topic=alpha');await enhanced(p);await next(p,'beta');await p.evaluate(()=>sessionStorage.removeItem('htmx-history-cache'));
    await p.goBack();await selected(p,'alpha');assert(requests.some(r=>r.restore&&r.representation==='full'&&!r.hx));return {evictedSnapshotFetchedFull:true};
   });
   await scenario('N05-enhancement-failure',async p=>{
    await p.goto(base+'/articles?topic=alpha');await enhanced(p);await p.locator('#broken').click();await p.waitForFunction(()=>window.probe.some(e=>e.name==='htmx:responseError'));await selected(p,'alpha');
    assert(requests.some(r=>r.hx&&r.status===503));await p.locator('#recover').click();await selected(p,'beta');assert.equal(await p.locator('#shell').count(),1);return {oldViewAndUrlRetained:true,explicitNativeRecovery:true};
   });
   await scenario('N06-script-failure',async p=>{
    await p.goto(base+'/articles?topic=alpha&scriptfail=1');assert(requests.some(r=>r.path==='/htmx.js?fail=1'&&r.status===503));assert.equal(await p.evaluate(()=>typeof window.htmx),'undefined');
    await p.locator('#next').click();await selected(p,'beta');await p.locator('select').selectOption('alpha');await p.getByRole('button',{name:'Filter'}).click();await selected(p,'alpha');return {nativeLinkAndFormDespiteScript503:true};
   });
   async function cachedFetch(p,path,hx=false){return p.evaluate(async({path,hx})=>{const r=await fetch(path,{headers:hx?{'HX-Request':'true'}:{}});return {status:r.status,text:await r.text(),etag:r.headers.get('etag')};},{path,hx});}
   await scenario('N07-fragment-before-document',async p=>{
    await p.goto(base+'/articles?topic=alpha');const path='/cache-good?topic=beta';const frag=await cachedFetch(p,path,true);assert(!frag.text.includes('id="shell"'));
    await p.goto(base+path);assert.equal(await p.locator('#shell').count(),1);await selected(p,'beta');return {fragmentThenFull:true};
   });
   await scenario('N08-document-before-fragment',async p=>{
    const path='/cache-good?topic=alpha';await p.goto(base+path);const frag=await cachedFetch(p,path,true);assert(!frag.text.includes('id="shell"'));assert(frag.text.includes('<main'));
    const full=await cachedFetch(p,path);assert(full.text.includes('id="shell"'));return {fullThenFragmentThenFull:true};
   });
   await scenario('N09-missing-vary-negative',async p=>{
    await p.goto(base+'/articles?topic=alpha');const path='/cache-bad?topic=beta';await cachedFetch(p,path,true);const before=requests.length;await p.goto(base+path);
    return {fragmentServedAsDocument:await p.locator('#shell').count()===0,additionalRequests:requests.slice(before),negativeControl:true};
   });
   await scenario('N10-conditional-representations',async()=>{
    const path=base+'/cache-good?topic=beta';const fragment=await fetch(path,{headers:{'HX-Request':'true'}});const etag=fragment.headers.get('etag');await fragment.text();
    const same=await fetch(path,{headers:{'HX-Request':'true','If-None-Match':etag}});assert.equal(same.status,304);
    const full=await fetch(path,{headers:{'If-None-Match':etag}});assert.equal(full.status,200);assert((await full.text()).includes('id="shell"'));assert.notEqual(full.headers.get('etag'),etag);
    const restore=await fetch(path,{headers:{'HX-Request':'true','HX-History-Restore-Request':'true'}});assert((await restore.text()).includes('id="shell"'));return {transport:'explicit Node HTTP requests; duplicated per browser group, not independent browser evidence',sameRepresentation:304,crossRepresentation:200,restoreFull:true};
   });
  }finally{await browser.close();}
 }
}finally{await new Promise(resolve=>server.close(resolve));}
const files={};for(const f of ['experiment.mjs','package.json','package-lock.json','node_modules/htmx.org/dist/htmx.js'])files[f]=createHash('sha256').update(await readFile(new URL(f,dir))).digest('hex');
const receipt={date:new Date().toISOString(),node:process.version,kind:'authored-http-fixture-with-pinned-htmx',browsers,files,results,passed:results.filter(r=>r.status==='pass').length,total:results.length};
await writeFile(output,JSON.stringify(receipt,null,2)+'\n');console.log(JSON.stringify({output,passed:receipt.passed,total:receipt.total,failures:results.filter(r=>r.status==='fail')},null,2));if(receipt.passed!==receipt.total)process.exitCode=1;