// Shared page runtime: site config, nav, formatting. Zero dependencies.
window.IAP = (function () {
  let config = null;
  const $ = id => document.getElementById(id);

  async function getConfig() {
    if (!config) config = await (await fetch('/api/config')).json();
    return config;
  }
  function fmtPol(wei) {
    const s = BigInt(wei).toString().padStart(19, '0');
    const whole = s.slice(0, -18) || '0';
    const frac = s.slice(-18, -12).replace(/0+$/, '');
    return whole + (frac ? '.' + frac : '');
  }
  const fmtUsd = cents => '$' + (cents / 100).toFixed(2);

  function status(msg, cls) {
    let el = $('status');
    if (!el) { el = document.createElement('div'); el.id = 'status'; document.body.appendChild(el); }
    el.textContent = msg; el.className = cls || ''; el.hidden = false;
    clearTimeout(status._t);
    if (cls === 'ok') status._t = setTimeout(() => { el.hidden = true; }, 6000);
  }

  async function renderNav(active) {
    const c = await getConfig();
    const nav = document.createElement('nav');
    nav.innerHTML = '<div class="wrap">'
      + '<a class="logo" href="/">Instant<b>AdPay</b></a>'
      + '<span class="links">'
      + '<a href="/" data-p="home">How it works</a>'
      + '<a href="/ledger" data-p="ledger">Live ledger</a>'
      + '<a href="/my" data-p="my">My account</a>'
      + '</span><span id="navWallet" class="muted">…</span></div>';
    document.body.prepend(nav);
    if (c.rehearsal) {
      const b = document.createElement('div');
      b.className = 'rehearsal';
      b.innerHTML = '<b>Testnet rehearsal</b> — running on ' + c.chainName + '. Purchases use valueless test POL while we prove every payout in public.';
      document.body.prepend(b);
    }
    const a = nav.querySelector('[data-p="' + active + '"]');
    if (a) a.style.color = 'var(--ink)';
    refreshNavWallet();
  }
  async function refreshNavWallet() {
    try {
      const me = await (await fetch('/api/me')).json();
      const el = $('navWallet');
      if (!el) return;
      if (me.signedIn) {
        el.innerHTML = (me.memberId ? '<span class="badge">member #' + me.memberId + '</span> ' : '')
          + '<span class="mono">' + me.address.slice(0, 6) + '…' + me.address.slice(-4) + '</span>';
      } else {
        el.innerHTML = '<a href="/my">Sign in</a>';
      }
      return me;
    } catch (e) { return null; }
  }
  function describeEvent(ev, c) {
    const pol = w => fmtPol(w) + ' POL';
    switch (ev.type) {
      case 'Purchase': return '🧾 member #' + ev.buyerId + ' bought package #' + ev.productId
        + ' (' + fmtUsd(ev.priceCents) + ') for ' + pol(ev.paidWei) + ' → +' + ev.creditAmount.toLocaleString() + ' credits';
      case 'TierPaid': return '💸 level ' + ev.tier + ' payout → member #' + ev.recipientId + ': ' + pol(ev.amountWei)
        + (ev.hops ? ' (passed up ' + ev.hops + ')' : '');
      case 'PassedUp': return '↷ level ' + ev.tier + ' passed over #' + ev.skippedId + ' (' + ev.reason + ')';
      case 'AdminPaid': return '🏛 platform fee settled: ' + pol(ev.amountWei);
      case 'BuyerCounted': return '⭐ member #' + ev.sponsorId + ' now has ' + ev.newCount + ' qualifying buyer(s)';
      case 'MemberActivated': return '👤 member #' + ev.id + ' activated a payout wallet';
      case 'AwardPaid': return '🎁 award: ' + pol(ev.amountWei) + ' → member #' + ev.toId;
      case 'CreditsConsumed': return '📣 member #' + ev.memberId + ' ran ads: −' + ev.amount.toLocaleString() + ' credits';
      case 'PriceCached': return '🔮 oracle price refreshed';
      case 'FallbackPriceUsed': return '🔮 cached price bridged an oracle gap';
      default: return '· ' + ev.type;
    }
  }
  function feedRow(ev, c) {
    const div = document.createElement('div');
    div.className = 'row t-' + ev.type;
    div.innerHTML = '<span>' + describeEvent(ev, c) + '</span>'
      + '<span class="tx"><a target="_blank" rel="noopener" href="' + c.explorer + '/tx/' + ev.tx + '">verify ↗</a></span>';
    return div;
  }
  return { getConfig, fmtPol, fmtUsd, status, renderNav, refreshNavWallet, describeEvent, feedRow, $ };
})();