// Generated, do not edit. sha256:867f87b26d0b27fe51f4a0cb77d5196bad8cd8b58a6856168c9cad25f5776d99
import { t, localeTag } from '../i18n/index.js';
import { CONFIG } from '../../shared/config.js';
import { esc } from '../ui/escape.js';
import { licenseSnapshot, loadLicense, markLicenseSeen } from '../license.js';
import { installLicense } from '../data/license-install.js';
import { refreshAttention } from '../ui/attention.js';
import { npubFromHex, shortKey, secretFromText, publicKeyOf, nsecFromSecret, newSecret } from '../nostr/keys.js';
import { keySigner, extensionSigner, nip98Header } from '../nostr/nip98.js';
import { qrSvg, invoiceQrText } from '../ui/qr.js';
import { CHECK, CHEVRON, IMAGE } from '../ui/icons.js';
import { setPageHint } from '../ui/page-hint.js';
import { splashMarkHtml } from '../ui/splash.js';
import { expanders } from '../ui/expand.js';
import { supportInfo, supportMessages, sendSupport, supportAttachment } from '../data/support.js';
import { licenseShop, buyerLicenses, saleInfo, placeOrder, orderStatus } from '../data/license-buyer.js';

const BROKEN = new Set(['invalid', 'unreadable']);

function buyerOf(s) {
  const npub = npubFromHex(s.buyer);
  return { text: shortKey(npub ?? s.buyer, 10), title: npub ?? s.buyer ?? '' };
}

function standHtml(s) {
  const out = [];
  if (s.installed) {
    const buyer = buyerOf(s);
    const range = t('license.cardFacts', {
      issued: s.issued ?? '', from: s.installed.majorFrom,
      to: s.installed.majorTo === 'unlimited' ? t('license.unlimited') : s.installed.majorTo,
    });
    const [before, after] = t('license.cardFor', { npub: '§' }).split('§');
    out.push(`<p class="t-body-sm">${esc(before)}<span class="badge badge-accent" title="${esc(`${buyer.title}\n${range}`)}">${esc(buyer.text)}</span>${esc(after)}</p>`);
  } else {
    out.push(`<p class="t-body-sm">${esc(t(s.level === 'full' ? 'license.cardFull' : 'license.cardFree'))}</p>`);
  }
  if (BROKEN.has(s.why)) out.push(`<p class="t-body-sm">${esc(`${t('license.cardProblem')} ${t(`license.why_${s.why}`)}.`)}</p>`);
  return out.join('');
}

async function installAndReload(text, message) {
  message.className = 't-body-sm';
  message.textContent = '';
  try {
    const result = await installLicense(text);
    message.classList.add('t-pos');
    message.textContent = result.covers ? t('license.installOk') : t('license.installOkFuture');
    setTimeout(() => location.reload(), 1200);
  } catch (err) {
    message.classList.add('t-neg');
    message.textContent = err.message;
  }
}

const INFO = ['Nostr', 'Why', 'SignIn', 'Zap', 'Privacy'];
const link = (url, html) => `<a href="${esc(url)}" target="_blank" rel="noopener noreferrer">${html}</a>`;
const legendRows = () => [
  say('license.payIntro'),
  ...['easy', 'other'].flatMap(group => [{ heading: say(`license.payGroup_${group}`) },
    ...CONFIG.LICENSE.PAY_APPS.filter(a => a.group === group)
      .map(a => `${link(a.url, `<strong>${esc(a.name)}</strong>`)} ${say(`license.payApp_${a.id}`)}`)]),
  say('license.payNote'),
  { heading: say('license.nostrMore') },
  ...INFO.map(k => `<strong>${say(`license.info${k}Head`)}</strong> ${say(`license.info${k}`)}`),
  ...CONFIG.LICENSE.INFO_LINKS.map(l => link(l.url, say(`license.link_${l.id}`))),
];

let signer = null;
let newKey = null;

const npubText = (hex) => {
  const npub = npubFromHex(hex) ?? hex;
  return `<span title="${esc(npub)}">${esc(shortKey(npub, 10))}</span>`;
};
const say = (key, params) => esc(t(key, params));

async function drawSignIn(box, s) {
  let shop = { serviceUrl: null, buyer: null };
  try { shop = await licenseShop(); } catch { }
  serviceUrl = shop.serviceUrl;
  drawBuy();
  drawSupport();

  const head = `<div class="lic-head"><div class="t-label">${say('license.signInTitle')}</div></div>`;

  if (signer) {
    const who = t(signer.kind === 'extension' ? 'license.signedInExtension' : 'license.signedIn', { npub: '§' });
    const [before, after] = who.split('§');
    const other = s.installed && s.buyer && s.buyer !== signer.pubkey;
    box.innerHTML = `
      <div class="flex-between gap-sm"><span class="t-body-sm">${esc(before)}${npubText(signer.pubkey)}${esc(after)}</span>
        <button class="btn btn-ghost btn-sm" type="button" data-signout>${say('license.signOut')}</button></div>
      ${other ? `<p class="t-body-sm">${say('license.otherBuyer')}</p>` : ''}
      <div data-licenses class="mt-sm"></div>
      <p class="t-body-sm" data-signin-msg></p>`;
    box.querySelector('[data-signout]').onclick = () => { signer = null; drawSignIn(box, s); };
    await drawLicenses(box.querySelector('[data-licenses]'), box.querySelector('[data-signin-msg]'), shop);
    return;
  }

  if (newKey) {
    const nsec = nsecFromSecret(newKey.secret);
    box.innerHTML = `${head}
      <p class="t-body-sm">${say('license.newKeyIntro')}</p>
      <input class="input t-mono" type="text" readonly value="${esc(nsec)}" data-nsec aria-label="${esc(t('license.newKeyTitle'))}">
      <p class="t-caption mt-sm">${say('license.newKeyPublic', { npub: npubFromHex(publicKeyOf(newKey.secret)) })}</p>
      <div class="flex gap-sm mt-sm">
        <button class="btn btn-secondary btn-sm" type="button" data-key-copy>${say(newKey.copied ? 'license.newKeyCopied' : 'license.newKeyCopy')}</button>
        <button class="btn btn-secondary btn-sm" type="button" data-download>${say('license.newKeyDownload')}</button>
      </div>
      <label class="flex gap-sm mt-md t-body-sm"><input type="checkbox" data-saved> ${say('license.newKeySaved')}</label>
      <div class="flex gap-sm mt-md">
        <button class="btn btn-primary btn-sm" type="button" data-go disabled>${say('license.newKeyGo')}</button>
        <button class="btn btn-ghost btn-sm" type="button" data-cancel>${say('license.newKeyCancel')}</button>
      </div>`;
    const go = box.querySelector('[data-go]');
    const saved = box.querySelector('[data-saved]');
    const allow = () => { go.disabled = !(saved.checked && newKey.copied); };
    saved.onchange = allow;
    box.querySelector('[data-key-copy]').onclick = (e) => {
      newKey.copied = true;
      allow();
      copyText(nsec, box.querySelector('[data-nsec]')).then((ok) => { if (ok) e.target.textContent = t('license.newKeyCopied'); });
    };
    box.querySelector('[data-download]').onclick = () => {
      download(t('license.newKeyFileName'), `${nsec}\n`);
      newKey.copied = true;
      allow();
    };
    go.onclick = () => { signer = keySigner(newKey.secret); newKey = null; drawSignIn(box, s); };
    box.querySelector('[data-cancel]').onclick = () => { newKey = null; drawSignIn(box, s); };
    return;
  }

  const hasExtension = !!globalThis.nostr;
  const known = s.installed && s.buyer ? { key: 'license.signInKnown', hex: s.buyer }
    : shop.buyer ? { key: 'license.signInLast', hex: shop.buyer } : null;
  box.innerHTML = `${head}
    <p class="t-body-sm">${say('license.signInIntro')}</p>
    ${known ? `<p class="t-body-sm">${esc(t(known.key, { npub: '§' })).replace('§', npubText(known.hex))}</p>` : ''}
    <div class="flex gap-sm">
      <button class="btn btn-primary btn-sm" type="button" data-ext${hasExtension ? '' : ' disabled'}>${say('license.signInExtension')}</button>
      <button class="btn btn-secondary btn-sm" type="button" data-key>${say('license.signInKey')}</button>
      <button class="btn btn-ghost btn-sm" type="button" data-new>${say('license.signInNew')}</button>
    </div>
    ${hasExtension ? '' : `<p class="t-caption t-muted lic-status">${say('license.signInExtensionNone')}</p>`}
    <form class="mt-md" data-key-form hidden autocomplete="off">
      <label class="form-label" for="lic-nsec">${say('license.signInKeyLabel')}</label>
      <input class="input t-mono mt-sm" id="lic-nsec" type="password" autocomplete="off" spellcheck="false">
      <p class="t-caption mt-sm">${say('license.signInKeyHint')}</p>
      <div class="flex gap-sm mt-sm"><button class="btn btn-primary btn-sm" type="submit">${say('license.signInGo')}</button></div>
    </form>
    <p class="t-body-sm mt-sm" data-signin-msg></p>`;

  const msg = box.querySelector('[data-signin-msg]');
  const fault = (text) => { msg.className = 't-body-sm mt-sm t-neg'; msg.textContent = text; };
  box.querySelector('[data-ext]').onclick = async () => {
    try { signer = await extensionSigner(); drawSignIn(box, s); } catch (err) { fault(err.message); }
  };
  const form = box.querySelector('[data-key-form]');
  box.querySelector('[data-key]').onclick = () => { form.hidden = false; form.querySelector('input').focus(); };
  form.onsubmit = (e) => {
    e.preventDefault();
    const input = form.querySelector('input');
    const { secret, error } = secretFromText(input.value);
    input.value = '';
    if (error) { fault(t(error === 'npub' ? 'license.signInNpub' : 'license.signInBadKey')); return; }
    signer = keySigner(secret);
    drawSignIn(box, s);
  };
  box.querySelector('[data-new]').onclick = () => { newKey = { secret: newSecret(), copied: false }; drawSignIn(box, s); };
}

const BUY_POLL_MS = 3000;
let buyBox = null;
let serviceUrl = null;
let purchase = null;
let pollTimer = null;

const sats = (n) => Number(n).toLocaleString(localeTag());
const clock = (ms) => new Date(ms).toLocaleTimeString(localeTag(), { hour: '2-digit', minute: '2-digit' });
const FINAL = { expired: 'license.buyExpired', canceled: 'license.buyCanceled', underpaid: 'license.buyUnderpaid' };
const AWAY = new Set(['marketService.unreachable', 'marketService.timeout', 'marketService.unavailable']);

async function drawBuy() {
  const box = buyBox;
  if (!box) return;
  box.hidden = !signer && !purchase;
  if (box.hidden) return;
  const head = `<div class="lic-head"><div class="t-label">${say('license.buyTitle')}</div></div>`;

  if (purchase) {
    const o = purchase.order;
    const final = FINAL[o.status];
    const state = final ? say(final)
      : o.status === 'paid' ? say(o.waived ? 'license.buyWaived' : 'license.buyPaid')
        : say('license.buyWaiting');
    box.innerHTML = `${head}
      ${o.status === 'open' && o.paymentRequest ? `
        <p class="t-body-sm">${say('license.buyInvoice', { time: clock(o.expiresAt) })}</p>
        <div class="mt-sm">${qrSvg(invoiceQrText(o.paymentRequest), { label: t('license.buyQr') })}</div>
        <input class="input t-mono mt-sm" type="text" readonly value="${esc(o.paymentRequest)}" data-invoice aria-label="${esc(t('license.buyTitle'))}">
        <div class="flex gap-sm mt-sm">
          <a class="btn btn-primary btn-sm" href="${esc(`lightning:${o.paymentRequest}`)}">${say('license.buyOpenWallet')}</a>
          <button class="btn btn-secondary btn-sm" type="button" data-invoice-copy>${say('license.buyCopy')}</button>
        </div>` : ''}
      <p class="t-body-sm mt-md${final ? ' t-neg' : ''}">${state}</p>
      <p class="t-body-sm" data-buy-msg>${purchase.note ? esc(purchase.note) : ''}</p>
      ${final ? `<div class="flex gap-sm"><button class="btn btn-secondary btn-sm" type="button" data-buy-again>${say('license.buyAgain')}</button></div>` : ''}`;
    const copy = box.querySelector('[data-invoice-copy]');
    if (copy) copy.onclick = (e) => copyText(o.paymentRequest, box.querySelector('[data-invoice]')).then((ok) => { if (ok) e.target.textContent = t('license.buyCopied'); });
    const again = box.querySelector('[data-buy-again]');
    if (again) again.onclick = () => { purchase = null; drawBuy(); };
    return;
  }

  let sale = null;
  let problem = null;
  try { sale = await saleInfo(); } catch (err) { problem = AWAY.has(err.key) ? t('license.buyAway') : err.message; }
  const price = sale?.open ? say('license.buyPrice', { major: sale.major, sats: sats(sale.priceSat) })
    : sale ? say('license.buyClosed') : esc(problem ?? '');
  box.innerHTML = `${head}
    <p class="t-body-sm${problem ? ' t-neg' : ''}">${price}</p>
    <div class="flex gap-sm"><button class="btn btn-primary btn-sm" type="button" data-buy-go${sale?.open && signer ? '' : ' disabled'}>${say('license.buyButton')}</button></div>
    <p class="t-body-sm mt-sm" data-buy-msg></p>`;
  box.querySelector('[data-buy-go]').onclick = async (e) => {
    const msg = box.querySelector('[data-buy-msg]');
    e.target.disabled = true;
    try {
      const body = '{}';
      const header = await nip98Header(signer, { url: `${serviceUrl}/v1/orders`, method: 'POST', body });
      const { order, readKey } = await placeOrder(header, body);
      purchase = { order, readKey, note: '' };
      drawBuy();
      schedulePoll();
    } catch (err) {
      e.target.disabled = false;
      msg.className = 't-body-sm mt-sm t-neg';
      msg.textContent = err.message;
    }
  };
}

function schedulePoll() {
  clearTimeout(pollTimer);
  pollTimer = setTimeout(pollOnce, BUY_POLL_MS);
}

async function pollOnce() {
  if (!purchase?.readKey) return;
  try {
    const { order, license } = await orderStatus(purchase.order.id, purchase.readKey);
    purchase.order = order;
    purchase.note = '';
    if (license) {
      drawBuy();
      const msg = buyBox?.querySelector('[data-buy-msg]');
      if (!license.valid) { purchase.note = t('license.buyNotValid'); drawBuy(); return; }
      if (msg && buyBox.isConnected) await installAndReload(license.file, msg);
      else await installLicense(license.file).then(() => location.reload());
      return;
    }
    drawBuy();
    if (FINAL[order.status]) return;
  } catch (err) {
    purchase.note = err.message;
    drawBuy();
  }
  schedulePoll();
}

const SUPPORT_POLL_MS = 30_000;
let supportBox = null;
let supportDraft = '';
let supportFile = null;
let supportTimer = null;
const shots = new Map();

const supportUrl = (info, path) => `${info.serviceUrl}/v1/support/${path}`;

async function drawSupport() {
  const box = supportBox;
  if (!box) return;
  clearInterval(supportTimer);
  box.hidden = !signer;
  if (!signer) return;
  let info = null;
  try { info = await supportInfo(); } catch { info = null; }
  const head = `<div class="lic-head"><div class="t-label">${say('license.supportTitle')}</div>
    ${info ? `<button class="btn btn-ghost btn-sm" type="button" data-support-refresh>${say('license.supportRefresh')}</button>` : ''}</div>`;
  const nostr = info?.nostr?.pubkey
    ? `<p class="t-caption">${esc(t('license.supportNostr', { name: '§' })).replace('§', `<strong>${esc(info.nostr.name)}</strong> (${npubText(info.nostr.pubkey)})`)}</p>` : '';
  if (!info?.serviceUrl) {
    box.innerHTML = `${head}<p class="t-body-sm">${say('license.supportIntro')}</p>${nostr}`;
    return;
  }
  const mb = info.maxAttachmentBytes / 1024 / 1024;
  box.innerHTML = `${head}
    <p class="t-body-sm">${say('license.supportIntro')}</p>
    <div class="lic-chat" data-support-thread></div>
    <label class="form-label" for="lic-support">${say('license.supportLabel')}</label>
    <textarea class="input mt-sm" id="lic-support" rows="3" maxlength="${info.maxText}" placeholder="${esc(t('license.supportPlaceholder'))}">${esc(supportDraft)}</textarea>
    <div data-support-file></div>
    <div class="flex gap-sm mt-sm">
      <button class="btn btn-primary btn-sm" type="button" data-support-send>${say('license.supportSend')}</button>
      <input type="file" accept="${esc(info.attachmentTypes.join(','))}" data-support-input hidden>
      <button class="btn btn-ghost btn-sm lic-attach" type="button" data-support-pick
        title="${esc(`${t('license.supportAttach')}: ${t('license.supportAttachHint', { mb })}`)}" aria-label="${esc(t('license.supportAttach'))}">${IMAGE}</button>
    </div>
    <p class="t-body-sm mt-sm" data-support-msg></p>
    ${nostr}`;

  const field = box.querySelector('#lic-support');
  const msg = box.querySelector('[data-support-msg]');
  const thread = box.querySelector('[data-support-thread]');
  const picker = box.querySelector('[data-support-input]');
  const show = (cls, line) => { msg.className = `t-body-sm mt-sm ${cls}`; msg.textContent = line; };
  field.oninput = () => { supportDraft = field.value; };

  const showFile = () => {
    const area = box.querySelector('[data-support-file]');
    area.innerHTML = supportFile ? `<div class="lic-pending"><img class="lic-shot" src="${esc(supportFile.url)}" alt="${esc(t('license.supportScreenshot'))}">
      <button class="btn btn-ghost btn-sm" type="button" data-support-unpick>${say('license.supportRemoveAttachment')}</button></div>` : '';
    area.querySelector('[data-support-unpick]')?.addEventListener('click', () => { supportFile = null; showFile(); });
  };
  const take = (file) => {
    if (!file) return;
    if (!info.attachmentTypes.includes(file.type)) { show('t-neg', t('license.supportAttachType')); return; }
    if (file.size > info.maxAttachmentBytes) { show('t-neg', t('license.supportAttachTooLarge', { mb })); return; }
    const reader = new FileReader();
    reader.onload = () => {
      const url = String(reader.result);
      supportFile = { type: file.type, data: url.slice(url.indexOf(',') + 1), url };
      show('', '');
      showFile();
    };
    reader.readAsDataURL(file);
  };
  showFile();
  box.querySelector('[data-support-pick]').onclick = () => picker.click();
  picker.onchange = () => { take(picker.files?.[0]); picker.value = ''; };
  field.addEventListener('paste', (e) => {
    const item = [...(e.clipboardData?.items ?? [])].find(i => i.kind === 'file' && i.type.startsWith('image/'));
    if (item) { e.preventDefault(); take(item.getAsFile()); }
  });

  box.querySelector('[data-support-refresh]').onclick = () => drawThread(thread, info);
  drawThread(thread, info);
  if (signer.kind === 'key') {
    supportTimer = setInterval(() => {
      if (!thread.isConnected) { clearInterval(supportTimer); return; }
      drawThread(thread, info, { quiet: true });
    }, SUPPORT_POLL_MS);
  }

  box.querySelector('[data-support-send]').onclick = async (e) => {
    const text = field.value.trim();
    if (!text && !supportFile) { show('t-neg', t('license.supportEmpty')); return; }
    if (text.length > info.maxText) { show('t-neg', t('license.supportTooLong', { max: info.maxText })); return; }
    e.target.disabled = true;
    e.target.textContent = t('license.supportSending');
    try {
      const body = JSON.stringify({ text, attachment: supportFile ? { type: supportFile.type, data: supportFile.data } : null });
      const header = await nip98Header(signer, { url: supportUrl(info, 'messages'), method: 'POST', body });
      const sent = await sendSupport(header, body);
      if (supportFile && sent.attachments?.[0]) shots.set(sent.attachments[0].id, supportFile.url);
      supportDraft = '';
      supportFile = null;
      field.value = '';
      showFile();
      show('', '');
      await drawThread(thread, info);
    } catch (err) {
      show('t-neg', AWAY.has(err.key) ? t('license.supportAway') : err.message);
    } finally {
      e.target.disabled = false;
      e.target.textContent = t('license.supportSend');
    }
  };
}

async function drawThread(area, info, { quiet = false } = {}) {
  if (!quiet) area.innerHTML = `<p class="t-body-sm">${say('license.supportThreadLoading')}</p>`;
  let list;
  try {
    const header = await nip98Header(signer, { url: supportUrl(info, 'messages'), method: 'GET' });
    list = await supportMessages(header);
  } catch (err) {
    if (quiet) return;
    area.innerHTML = `<p class="t-body-sm t-neg">${esc(AWAY.has(err.key) ? t('license.supportAway') : err.message)}</p>`;
    return;
  }
  if (!list.length) { area.innerHTML = `<p class="t-body-sm">${say('license.supportThreadEmpty')}</p>`; return; }
  const when = (ms) => new Date(ms).toLocaleString(localeTag(), { dateStyle: 'short', timeStyle: 'short' });
  const who = (m) => t(m.from === 'buyer' ? 'license.supportYou' : m.ai ? 'license.supportAi' : 'license.supportSeller');
  const shot = (a) => (shots.has(a.id)
    ? `<img class="lic-shot" src="${esc(shots.get(a.id))}" alt="${esc(t('license.supportScreenshot'))}">`
    : `<button class="btn btn-ghost btn-sm" type="button" data-shot="${esc(a.id)}">${say('license.supportShowScreenshot')}</button>`);
  area.innerHTML = list.map(m => `<div class="lic-msg ${m.from === 'buyer' ? 'is-mine' : 'is-theirs'}">
      <div class="lic-bubble">${m.text ? `<p class="t-body-sm">${esc(m.text)}</p>` : ''}${m.attachments.map(shot).join('')}</div>
      <span class="t-caption">${esc(who(m))} · ${esc(when(m.at))}</span>
    </div>`).join('');
  const toEnd = () => { area.scrollTop = area.scrollHeight; };
  toEnd();
  area.querySelectorAll('img').forEach(img => img.addEventListener('load', toEnd, { once: true }));

  const load = async (button) => {
    const id = button.dataset.shot;
    try {
      const header = await nip98Header(signer, { url: supportUrl(info, `attachments/${id}`), method: 'GET' });
      const { mime, data } = await supportAttachment(header, id);
      if (!info.attachmentTypes.includes(mime) || !/^[A-Za-z0-9+/=]+$/.test(data)) return;
      shots.set(id, `data:${mime};base64,${data}`);
      const img = document.createElement('img');
      img.className = 'lic-shot';
      img.alt = t('license.supportScreenshot');
      img.addEventListener('load', toEnd, { once: true });
      img.src = shots.get(id);
      button.replaceWith(img);
    } catch (err) {
      button.textContent = err.message;
    }
  };
  area.querySelectorAll('[data-shot]').forEach(button => {
    if (signer.kind === 'key') load(button);
    else button.onclick = () => load(button);
  });
}

async function drawLicenses(area, msg, shop) {
  area.innerHTML = `<p class="t-body-sm">${say('license.licensesLoading')}</p>`;
  let list;
  try {
    const header = await nip98Header(signer, { url: `${shop.serviceUrl}/v1/license`, method: 'GET' });
    list = await buyerLicenses(header);
  } catch (err) {
    area.innerHTML = '';
    msg.className = 't-body-sm t-neg';
    msg.textContent = err.message;
    return;
  }
  if (!list.length) { area.innerHTML = `<p class="t-body-sm">${say('license.licensesNone')}</p>`; return; }
  area.innerHTML = list.map((l, i) => {
    if (l.unreadable) return `<p class="t-body-sm">${say('license.licenseNotValid')}</p>`;
    const text = say('license.licenseLine', {
      level: t(`license.level_${l.level}`), from: l.majorFrom,
      to: l.majorTo === 'unlimited' ? t('license.unlimited') : l.majorTo, issued: l.issued,
    });
    const state = !l.valid ? say('license.licenseNotValid')
      : l.installed ? `<span class="badge badge-neutral">${say('license.licenseInstalled')}</span>`
        : `<button class="btn btn-secondary btn-sm" type="button" data-install="${i}">${say('license.licenseInstall')}</button>`
          + (l.covers ? '' : ` <span class="t-caption">${say('license.licenseNotCovered')}</span>`);
    return `<div class="flex-between gap-sm mt-sm"><span class="t-body-sm">${text}</span><span>${state}</span></div>`;
  }).join('');
  area.querySelectorAll('[data-install]').forEach(b => { b.onclick = () => installAndReload(list[Number(b.dataset.install)].file, msg); });
}

async function copyText(text, field) {
  try { field.select(); if (document.execCommand('copy')) return true; } catch { }
  try { await navigator.clipboard.writeText(text); return true; } catch { return false; }
}

function download(name, text) {
  const a = document.createElement('a');
  a.href = URL.createObjectURL(new Blob([text], { type: 'text/plain' }));
  a.download = name;
  a.click();
  setTimeout(() => URL.revokeObjectURL(a.href), 1000);
}

const mark = (v) => {
  if (v === true) return `<span class="lic-feat-yes" title="${esc(t('license.featIncluded'))}">${CHECK}</span>`;
  if (v === false) return `<span class="lic-feat-no" title="${esc(t('license.featExcluded'))}">-</span>`;
  if (v === 'partial') return `<span class="lic-feat-part" title="${esc(t('license.featPartialTitle'))}">${CHECK}</span>`;
  return `<span class="lic-feat-open" title="${esc(t('license.featUndecided'))}">?</span>`;
};

const MARKS = '.lic-feat-yes, .lic-feat-no, .lic-feat-part, .lic-feat-open';

const inFree = f => (f.has ? CONFIG.LICENSE.FREE.HAS[f.has] : f.free);

function groupFree(items) {
  const v = items.map(inFree);
  if (v.every(x => x === true)) return true;
  if (v.every(x => x === false)) return false;
  return v.some(x => x === true) ? 'partial' : null;
}

const groupKey = g => `feat_${g}`;

function featuresHtml(expand) {
  const groups = CONFIG.LICENSE.FEATURE_GROUPS.map((g) => {
    const items = CONFIG.LICENSE.FEATURES.filter(f => f.group === g);
    const sub = items.map(f => `
        <li class="lic-feat-row" tabindex="0" data-feature="${esc(f.id)}"><span>${esc(t(`license.feat_${f.id}`))}</span>${mark(true)}${mark(inFree(f))}</li>`).join('');
    return `
      <details class="lic-group" ${expand.attr(groupKey(g))}>
        <summary class="lic-feat-row lic-group-row" data-feature="${esc(items[0].id)}">
          <span class="lic-group-name"><span class="chev-btn">${CHEVRON}</span>${esc(t(`license.featGroup_${g}`))}</span>${mark(true)}${mark(groupFree(items))}
        </summary>
        <ul class="lic-feat-sub">${sub}</ul>
      </details>`;
  }).join('');
  return `
    <div class="lic-hero">${splashMarkHtml()}<div class="t-label">${esc(t('license.featTitle'))}</div></div>
    <div class="lic-feat">
      <div class="lic-feat-row lic-feat-cols"><span></span><span>${esc(t('license.featFull'))}</span><span>${esc(t('license.featFree'))}</span></div>
      ${groups}
    </div>`;
}

function placeShot(shot, anchor) {
  const gap = 8, pad = 8;
  const r = anchor.getBoundingClientRect();
  const w = shot.offsetWidth, h = shot.offsetHeight;
  let top = r.top - gap - h;
  if (top < pad) top = r.bottom + gap;
  const left = Math.min(Math.max(pad, r.left + r.width / 2 - w / 2), window.innerWidth - pad - w);
  shot.style.left = `${left}px`;
  shot.style.top = `${Math.min(Math.max(pad, top), window.innerHeight - pad - h)}px`;
}

function bindFeatures(root) {
  document.querySelector('body > .lic-feat-shot')?.remove();
  const shot = document.createElement('div');
  shot.className = 'lic-feat-shot';
  shot.hidden = true;
  document.body.appendChild(shot);
  let current = null;
  let on = null;
  const show = (row, anchor = row) => {
    if (anchor === on && !shot.hidden) return;
    on = anchor;
    root.querySelectorAll('[data-feature]').forEach(r => r.classList.toggle('is-on', r === row));
    shot.hidden = false;
    placeShot(shot, anchor);
    const id = row.dataset.feature;
    if (id === current) return;
    current = id;
    shot.innerHTML = '';
    const img = new Image();
    img.className = 'lic-feat-img';
    img.alt = t(`license.feat_${id}`);
    img.onload = () => { if (current === id) shot.replaceChildren(img); };
    img.onerror = () => { if (current === id) shot.innerHTML = `<p class="t-caption">${esc(t('license.featNoShot'))}</p>`; };
    img.src = `${CONFIG.LICENSE.FEATURE_IMAGES}/${id}.webp`;
  };
  const hide = () => {
    on = null;
    shot.hidden = true;
    root.querySelectorAll('.is-on').forEach(r => r.classList.remove('is-on'));
  };
  const over = (e) => {
    if (!root.isConnected) { stop(); return; }
    const mark = e.target.closest?.(MARKS);
    const row = mark?.closest('[data-feature]');
    if (row && root.contains(row)) show(row, mark); else hide();
  };
  const stop = () => {
    shot.remove();
    document.removeEventListener('pointerover', over);
    window.removeEventListener('scroll', hide, true);
    window.removeEventListener('hashchange', stop);
  };
  document.addEventListener('pointerover', over);
  window.addEventListener('scroll', hide, { capture: true, passive: true });
  window.addEventListener('hashchange', stop);
  root.addEventListener('focusin', (e) => { const row = e.target.closest('[data-feature]'); if (row) show(row); });
  root.addEventListener('focusout', hide);
  root.querySelectorAll('.lic-group').forEach(d => d.addEventListener('toggle', hide));
}

export async function render(el) {
  const s = licenseSnapshot() ?? await loadLicense();
  const expand = await expanders('license', Object.fromEntries(CONFIG.LICENSE.FEATURE_GROUPS.map(g => [groupKey(g), false])));

  el.innerHTML = `
    <div class="lic-layout">
    <div class="lic-main">
    <div class="card lic-card" data-features>${featuresHtml(expand)}</div>
    </div>
    <div class="lic-side">
    <div class="card lic-card">
      <div class="lic-head">
        <div class="t-label">${esc(t('license.cardTitle'))}</div>
        <span class="badge badge-accent">${esc(t('license.cardVersion', { version: s.version }))}</span>
      </div>
      ${standHtml(s)}
      <section class="lic-section" data-signin></section>
      <section class="lic-section" data-buy hidden></section>
    </div>
    <div class="card lic-card lic-chat-card" data-support hidden></div>
    </div>
    </div>`;
  setPageHint(el, { title: t('license.payTitle'), rows: legendRows() });
  expand.bind(el);
  bindFeatures(el.querySelector('[data-features]'));
  buyBox = el.querySelector('[data-buy]');
  supportBox = el.querySelector('[data-support]');
  drawSignIn(el.querySelector('[data-signin]'), s);

  markLicenseSeen().then(() => refreshAttention()).catch(() => { });
}