import {validateChannels,validatePreview} from '/airtap/channels.mjs';

// Share the canonical validator with official Android pages. Never manufacture
// a public APK URL from a private candidate or a source/package version.
const root = document.querySelector('[data-android-release]');
const link = root?.querySelector('[data-android-download]');
const status = root?.querySelector('[data-android-status]');
let release = null;
let pending = null;
const qrEntry=new URL(location.href),qrPlatform=qrEntry.searchParams.get('airtap');
let autoDownload=qrPlatform==='android'&&qrEntry.searchParams.get('download')==='1';
if(['android','ios'].includes(qrPlatform)){
  qrEntry.searchParams.delete('airtap');qrEntry.searchParams.delete('download');
  try{history.replaceState(null,'',qrEntry.pathname+qrEntry.search+qrEntry.hash);}catch{/* Browser history is optional. */}
}
const text = (fr,en)=>document.documentElement.lang==='en'?en:fr;
function render(){
  if(!link || !status)return;
  if(qrPlatform==='ios'){
    const title=root.querySelector('h3'),platform=root.querySelector('.app-platform');
    if(title)title.textContent=text('AirTap pour iPhone / iPad','AirTap for iPhone / iPad');
    if(platform)platform.textContent=text('iOS / iPadOS 15+ · Version en attente','iOS / iPadOS 15+ · Version on hold');
    link.href=release?.ios.available?release.ios.url:'/airtap/ios/';link.removeAttribute('download');
    link.textContent=release?.ios.available?text('Télécharger sur l’App Store','Download on the App Store'):text('Voir la disponibilité iPhone / iPad','Check iPhone / iPad availability');
    status.textContent=release?.ios.available?text('Version ','Version ')+release.ios.version:text('Version iPhone / iPad en attente. Aucun téléchargement Apple disponible actuellement.','iPhone / iPad version on hold. No Apple download is available yet.');
    return;
  }
  link.href='/airtap/android/';
  link.removeAttribute('download');
  if(release?.android.available){
    const item=release.android;
    link.href=item.url;
    link.setAttribute('download',`AirTap-${item.version}-arm64.apk`);
    link.textContent=text('Télécharger l’APK Android','Download Android APK');
    status.textContent=text('Version ','Version ')+item.version+' · '+(item.bytes/1048576).toFixed(1)+text(' Mo · Android 10+, ARM64',' MB · Android 10+, ARM64');
    if(item.channel==='preview')status.textContent+=text(' · Version d’essai — tests de connexion en cours',' · Preview — connection testing in progress');
  }else{
    link.textContent=text('Téléchargement Android','Android download');
    status.textContent=release?text('La livraison Android est en cours de validation. Retrouvez sa disponibilité sur la page officielle.','The Android release is being validated. Check availability on the official page.'):text('Disponibilité à vérifier sur la page officielle Android.','Check availability on the official Android page.');
  }
}
function handleInstallationQr(){
  if(!root||!status)return;
  if(qrPlatform==='ios'){
    status.textContent=text('iPhone / iPad : version en attente. Aucun téléchargement Apple disponible actuellement.','iPhone / iPad: version on hold. No Apple download is available yet.');
    return;
  }
  if(!autoDownload)return;autoDownload=false;
  // Only the exact public, qualified first-party APK may be reached. A QR
  // navigation starts a download on Android; it never starts an installation.
  if(!/Android/i.test(navigator.userAgent)){
    status.textContent=text('Ouvrez ce QR sur votre téléphone Android pour télécharger AirTap.','Open this QR on your Android phone to download AirTap.');return;
  }
  if(!release?.android.available)return;
  const guide=root.querySelector('[data-android-install]');if(guide)guide.hidden=false;
  location.assign(release.android.url);
}
async function refresh(){
  if(pending)return pending;
  pending=(async()=>{
    const abort=new AbortController();
    const timer=setTimeout(()=>abort.abort(),5000);
    try{
      const response=await fetch('/airtap/release.json',{cache:'no-store',credentials:'omit',referrerPolicy:'no-referrer',signal:abort.signal});
      if(!response.ok)throw Error('unavailable');
      const raw=await response.text();
      if(raw.length>4096)throw Error('oversized');
      release=validateChannels(JSON.parse(raw));
      if(release && !release.android.available){
        const previewResponse=await fetch('/airtap/preview.json',{cache:'no-store',credentials:'omit',referrerPolicy:'no-referrer',signal:abort.signal});
        if(previewResponse.ok){const previewRaw=await previewResponse.text();if(previewRaw.length<=4096){const preview=validatePreview(JSON.parse(previewRaw));if(preview)release.android=preview;}}
      }
    }catch(_){release=null;}finally{clearTimeout(timer);render();pending=null;}
  })();
  return pending;
}
if(link && status){
  link.addEventListener('click',async event=>{
    event.preventDefault();
    if(link.getAttribute('aria-busy')==='true')return;
    link.setAttribute('aria-busy','true');
    try{
      await refresh();
      if(qrPlatform==='ios'){location.assign(release?.ios.available?release.ios.url:'/airtap/ios/');return;}
      const ready=release?.android.available;
      const guide=root.querySelector('[data-android-install]');
      if(guide)guide.hidden=!ready;
      // Explicit user gesture only. The browser cannot start the package
      // installer or observe completion; Android keeps its confirmation step.
      location.assign(ready?release.android.url:'/airtap/android/');
    }finally{link.removeAttribute('aria-busy');}
  });
  render();void refresh().then(handleInstallationQr);
  new MutationObserver(render).observe(document.documentElement,{attributes:true,attributeFilter:['lang']});
  window.addEventListener('online',refresh);
}