app/static/index.html

<!doctype html>
<html lang="it">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>PLM Lottery</title>
<link rel="icon" type="image/svg+xml" href="/logo.svg">
<link rel="stylesheet" href="/style.css">
</head>
<body>

<nav class="hidden" id="app-navbar" aria-label="Sezioni">
  <div class="app-navbar-top">
    <div class="app-navbar-top-inner">
      <span class="brand">
        <img class="brand-mark" src="/logo.svg" alt="">
        PLM Lottery
      </span>
      <div class="app-navbar-account">
        <span class="navbar-username" id="dash-username"></span>
        <span class="navbar-balance mono">
          <svg class="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="2" y="7" width="20" height="14" rx="2"/><path d="M16 21V5a2 2 0 0 0-2-2H6a2 2 0 0 0-2 2v16"/></svg>
          <span id="navbar-balance">— PLM</span>
        </span>
        <a class="link icon-link" href="/guida" target="_blank" rel="noopener" title="Guida" aria-label="Apri la guida utente">
          <svg class="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"/><path d="M9.09 9a3 3 0 0 1 5.83 1c0 2-3 2-3 4"/><path d="M12 17h.01"/></svg>
        </a>
        <a class="link icon-link" href="https://github.com/REPLACE_ME/plm-lottery/issues/new" target="_blank" rel="noopener" title="Segnala un bug" aria-label="Segnala un bug su GitHub">
          <svg class="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M8 2v3M16 2v3M12 12v-2a2 2 0 1 1 2 2h-2Z"/><rect x="6" y="10" width="12" height="10" rx="4"/><path d="M6 15H3M21 15h-3M9 20v-3M15 20v-3"/></svg>
        </a>
        <button class="link icon-link" onclick="logout()" title="Esci" aria-label="Esci dall'account">
          <svg class="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M9 21H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h4"/><path d="M16 17l5-5-5-5M21 12H9"/></svg>
        </button>
      </div>
    </div>
  </div>
  <div class="app-navbar-tabs">
    <button class="navbar-tab active" id="nav-deposit" onclick="switchPanel('deposit')">
      <svg class="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="2" y="7" width="20" height="14" rx="2"/><path d="M16 21V5a2 2 0 0 0-2-2H6a2 2 0 0 0-2 2v16"/></svg>
      Deposito
    </button>
    <button class="navbar-tab" id="nav-bet" onclick="switchPanel('bet')">
      <svg class="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="2" y="6" width="20" height="12" rx="2"/><path d="M6 12h.01M12 12h.01M18 12h.01"/></svg>
      Bet
    </button>
    <button class="navbar-tab" id="nav-withdraw" onclick="switchPanel('withdraw')">
      <svg class="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M12 19V5M5 12l7-7 7 7"/></svg>
      Prelievo
    </button>
    <button class="navbar-tab" id="nav-profile" onclick="switchPanel('profile')">
      <svg class="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M20 21v-2a4 4 0 0 0-4-4H8a4 4 0 0 0-4 4v2"/><circle cx="12" cy="7" r="4"/></svg>
      Profilo
    </button>
  </div>
</nav>

<div class="app-shell">

<div class="chain-bar" id="chain-bar">
  <span class="chain-status-pill">
    <span class="status-dot" id="chain-status-dot"></span>
    <span id="chain-status-label">Connessione…</span>
  </span>
  <span class="chain-block mono" id="chain-block">Blocco —</span>
</div>

<div class="maintenance-banner hidden" id="maintenance-banner">
  <span>⚠️</span>
  <span>Manutenzione in programma: il round in corso viene completato regolarmente (vincitore incluso), ma il round successivo non si aprirà finché la manutenzione non sarà terminata.</span>
</div>

<section id="landing-hero" class="hero">
  <h1>PLM Lottery</h1>
  <p class="lead">Deposita PLM, entra nel round con una quota fissa, e se viene estratto il tuo numero vinci il montepremi.</p>

  <div class="hero-steps">
    <div class="hero-step">
      <div class="step-icon"><svg class="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="2" y="7" width="20" height="14" rx="2"/><path d="M16 21V5a2 2 0 0 0-2-2H6a2 2 0 0 0-2 2v16"/></svg></div>
      <div class="step-title">1. Deposita</div>
      <div class="step-hint">Ricevi un indirizzo PLM personale, tuo per sempre</div>
    </div>
    <div class="hero-step">
      <div class="step-icon"><svg class="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="2" y="6" width="20" height="12" rx="2"/><path d="M6 12h.01M12 12h.01M18 12h.01"/></svg></div>
      <div class="step-title">2. Gioca</div>
      <div class="step-hint">Una bet a quota fissa per entrare nel round corrente</div>
    </div>
    <div class="hero-step">
      <div class="step-icon"><svg class="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M8 21h8M12 17v4M7 4h10v4a5 5 0 0 1-10 0V4Z"/><path d="M7 5H4a1 1 0 0 0-1 1v1a4 4 0 0 0 4 4M17 5h3a1 1 0 0 1 1 1v1a4 4 0 0 1-4 4"/></svg></div>
      <div class="step-title">3. Vinci</div>
      <div class="step-hint">Estrazione dal blocco, montepremi accreditato subito</div>
    </div>
  </div>

  <div class="trust-row">
    <span class="trust-pill"><svg class="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M20 6 9 17l-5-5"/></svg>Quota fissa dichiarata</span>
    <span class="trust-pill"><svg class="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M20 6 9 17l-5-5"/></svg>Estrazione da hash di blocco</span>
    <span class="trust-pill"><svg class="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M20 6 9 17l-5-5"/></svg>Prelievo libero in ogni momento</span>
  </div>
</section>

<section id="auth-section" class="card">
  <div class="tabs">
    <div class="tab active" id="tab-login" onclick="switchTab('login')">Login</div>
    <div class="tab" id="tab-register" onclick="switchTab('register')">Registrati</div>
  </div>

  <div class="tab-panel active" id="panel-login">
    <label for="login-username">Username</label>
    <input id="login-username" autocomplete="username">
    <label for="login-password">Password</label>
    <input id="login-password" type="password" autocomplete="current-password">
    <button onclick="login()" id="login-btn">Accedi</button>
  </div>

  <div class="tab-panel" id="panel-register">
    <label for="reg-username">Username</label>
    <input id="reg-username" autocomplete="username">
    <label for="reg-password">Password</label>
    <input id="reg-password" type="password" autocomplete="new-password">
    <label for="reg-password-confirm">Conferma password</label>
    <input id="reg-password-confirm" type="password" autocomplete="new-password">
    <button onclick="register()" id="register-btn">Crea account</button>
  </div>
</section>

<section id="dashboard-section" class="hidden">

  <div class="card round-card" id="round-card">
    <div class="row-between" id="round-normal-row">
      <h2 id="round-title">Round —</h2>
      <span class="mono" id="round-timer" style="font-size:1.1rem;font-weight:700">--:--</span>
    </div>
    <div class="row-between" style="margin-top:10px" id="round-stats-row">
      <div>
        <div class="hint" style="margin-bottom:2px">Giocatori</div>
        <span class="mono" id="round-players">—</span>
      </div>
      <div style="text-align:right">
        <div class="hint" style="margin-bottom:2px">Jackpot</div>
        <span class="mono" id="round-jackpot">—</span> <span class="balance-unit">PLM</span>
      </div>
    </div>

    <div class="draw-state" id="draw-state">
      <div class="draw-spinner"></div>
      <div class="draw-label" id="draw-label">Estrazione del vincitore in corso…</div>
    </div>

    <div class="hidden" id="draw-result"></div>
  </div>

  <div class="dash-panel active" id="panel-deposit">
    <div class="card">
      <h2>Saldo interno</h2>
      <p class="hint">Aggiornato dopo 1 conferma sulla rete</p>
      <div class="row-between">
        <div><span class="balance-value mono" id="dash-balance">—</span> <span class="balance-unit">PLM</span></div>
        <button class="secondary" onclick="refreshMe()" id="refresh-btn" aria-label="Aggiorna saldo">
          <svg class="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21 12a9 9 0 1 1-2.64-6.36M21 3v6h-6"/></svg>
          Aggiorna
        </button>
      </div>
    </div>

    <div class="card">
      <h2>Indirizzo di deposito</h2>
      <p class="hint">È anche l'indirizzo su cui ricevi eventuali vincite</p>
      <div class="address-box">
        <span class="mono" id="dash-address"></span>
        <button class="secondary" onclick="copyAddress()" aria-label="Copia indirizzo">
          <svg class="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="9" y="9" width="13" height="13" rx="2"/><path d="M5 15H4a2 2 0 0 1-2-2V4a2 2 0 0 1 2-2h9a2 2 0 0 1 2 2v1"/></svg>
        </button>
      </div>
      <div class="qr-box">
        <img id="dash-qr" alt="QR code dell'indirizzo di deposito">
      </div>
    </div>
  </div>

  <div class="dash-panel" id="panel-bet">
    <div class="card">
      <h2>Bet</h2>
      <p class="hint">Ingresso fisso al round corrente</p>
      <button onclick="placeBet()" id="bet-btn">Piazza bet (10 PLM)</button>
    </div>
  </div>

  <div class="dash-panel" id="panel-withdraw">
    <div class="card">
      <h2>Withdrawal</h2>
      <p class="hint">Invia fondi a un indirizzo PLM esterno</p>
      <label for="wd-address">Indirizzo esterno</label>
      <input id="wd-address" class="mono" placeholder="plm1q...">
      <p class="hint">Solo indirizzi P2WPKH bech32 (quelli che iniziano con <code>plm1q...</code>). Indirizzi legacy (<code>P...</code>) o P2SH non sono supportati.</p>
      <label for="wd-amount">Importo (PLM)</label>
      <input id="wd-amount" inputmode="decimal" placeholder="es. 2">
      <label class="checkbox-row">
        <input type="checkbox" id="wd-full-amount" onchange="toggleWithdrawFullAmount()">
        Preleva l'intero importo (<span class="mono" id="wd-full-amount-value">—</span> PLM)
      </label>
      <button onclick="withdraw()" id="withdraw-btn">Preleva</button>
    </div>
  </div>

  <div class="dash-panel" id="panel-profile">
    <div class="card">
      <h2>Profilo</h2>
      <p class="hint">Le tue informazioni account</p>
      <label>Username</label>
      <div class="address-box"><span id="profile-username">—</span></div>
      <label>Indirizzo di deposito</label>
      <div class="address-box"><span class="mono" id="profile-address">—</span></div>
      <label>Saldo interno</label>
      <div class="address-box"><span class="mono" id="profile-balance">—</span> <span class="balance-unit">PLM</span></div>
      <label>Utente dal</label>
      <div class="address-box"><span id="profile-created-at">—</span></div>
    </div>

    <div class="card">
      <h2>Impostazioni</h2>
      <p class="hint">Cambia la password del tuo account</p>
      <label for="settings-current-password">Password attuale</label>
      <input id="settings-current-password" type="password" autocomplete="current-password">
      <label for="settings-new-password">Nuova password</label>
      <input id="settings-new-password" type="password" autocomplete="new-password">
      <label for="settings-new-password-confirm">Conferma nuova password</label>
      <input id="settings-new-password-confirm" type="password" autocomplete="new-password">
      <button onclick="changePassword()" id="change-password-btn">Aggiorna password</button>
    </div>
  </div>

</section>

</div>

<div id="toast-container" aria-live="polite"></div>

<script>
const SATS_PER_PLM = 100000000;

let token = localStorage.getItem('plm_token');
let username = localStorage.getItem('plm_username');
let address = localStorage.getItem('plm_address');

function toast(message, type) {
  const container = document.getElementById('toast-container');
  const el = document.createElement('div');
  el.className = 'toast ' + type;
  el.textContent = message;
  container.appendChild(el);
  setTimeout(() => el.remove(), 4000);
}

async function withLoading(button, label, fn) {
  const original = button.textContent;
  button.disabled = true;
  button.textContent = label;
  try {
    await fn();
  } finally {
    button.disabled = false;
    button.textContent = original;
  }
}

const REQUEST_TIMEOUT_MS = 15000;

// Without a timeout, a single request that never resolves (server-side hang —
// stuck DB session, unresponsive Electrum connection...) would stall the whole
// sequential polling chain forever: the UI just freezes on whatever was last
// rendered, with no error and no "connessione persa" (that only fires on a
// rejected fetch, never on one that's merely stuck).
async function call(method, path, body) {
  const headers = { 'Content-Type': 'application/json' };
  if (token) headers['Authorization'] = 'Bearer ' + token;
  const controller = new AbortController();
  const timeoutId = setTimeout(() => controller.abort(), REQUEST_TIMEOUT_MS);
  let res;
  try {
    res = await fetch(path, { method, headers, body: body ? JSON.stringify(body) : undefined, signal: controller.signal });
  } catch (e) {
    throw new Error(e.name === 'AbortError' ? 'Richiesta al server scaduta.' : e.message);
  } finally {
    clearTimeout(timeoutId);
  }
  const data = await res.json().catch(() => ({}));
  if (!res.ok) throw new Error(data.detail || res.statusText);
  return data;
}

function switchTab(name) {
  document.getElementById('tab-login').classList.toggle('active', name === 'login');
  document.getElementById('tab-register').classList.toggle('active', name === 'register');
  document.getElementById('panel-login').classList.toggle('active', name === 'login');
  document.getElementById('panel-register').classList.toggle('active', name === 'register');
}

function switchPanel(name) {
  for (const key of ['deposit', 'bet', 'withdraw', 'profile']) {
    document.getElementById('nav-' + key).classList.toggle('active', key === name);
    document.getElementById('panel-' + key).classList.toggle('active', key === name);
  }
}

// Bumped on every logout/login so an in-flight refreshRound() started under a
// previous session can detect it's now stale — a fetch can still be awaiting
// its response after logout() clears the timeout-based poll chain, and without
// this guard it would re-arm scheduleNextRoundPoll() and resurrect a "zombie"
// dashboard poll running in parallel with the logged-out chain-only poll.
let sessionEpoch = 0;
let roundCloseAt = null;
let serverTimeOffsetMs = 0; // serverNow - clientNow, so every client's countdown agrees regardless of local clock skew
function serverNow() { return new Date(Date.now() + serverTimeOffsetMs); }
// refreshRound() is triggered from several independent sources (poll timer, timer-hits-zero,
// visibilitychange, placeBet, showDashboard) whose requests can resolve out of order over the
// network. Track the latest applied response so a slow, stale one can never revert the UI to an
// older round's state after a newer response has already moved it forward.
let roundRequestSeq = 0;
let roundAppliedSeq = 0;
let roundTimerInterval = null;
let roundPollTimeout = null;
let lastResultInterval = null;

const ROUND_STATUS_LABELS = {
  open: 'aperto',
  closing: 'in chiusura',
  drawing: 'estrazione in corso',
  paying_out: 'pagamento al vincitore in corso',
};

const DRAWING_STATUSES = ['closing', 'drawing', 'paying_out'];

// One distinct message per DRAW sub-phase (see CLAUDE.md's "three separate
// on-chain confirmations" note) instead of a single generic spinner label —
// takes the round data so the drawing phase can surface the draw block once known.
function drawingLabelFor(data) {
  if (data.status === 'closing') {
    return 'Round chiuso — in attesa di conferma dell\'ultima giocata prima di estrarre il vincitore…';
  }
  if (data.status === 'drawing') {
    return 'In attesa del prossimo blocco per estrarre il vincitore…';
  }
  // paying_out
  if (data.draw_block_height != null) {
    return 'Vincitore estratto dal blocco #' + data.draw_block_height + ' — pagamento al vincitore in corso…';
  }
  return 'Vincitore estratto — pagamento al vincitore in corso…';
}

// One label per real round status, not just the coarse open/drawing/waiting
// grouping — the status bar should show the same phase distinction as the
// draw-state panel (drawingLabelFor above), just condensed to a short phrase.
const CHAIN_STATUS_LABELS = {
  waiting: 'In attesa del prossimo round',
  open: 'Round aperto',
  closing: 'Round chiuso — attesa conferma puntate',
  drawing: 'Estrazione in corso',
  paying_out: 'Pagamento al vincitore in corso',
};

function updateChainStatusBar(data) {
  const dot = document.getElementById('chain-status-dot');
  const label = document.getElementById('chain-status-label');
  const block = document.getElementById('chain-block');

  // The dot's color/pulse only distinguishes waiting/open/drawing (that's all
  // the CSS defines) — closing and paying_out both pulse like drawing, they
  // just get their own text label below.
  let dotKey;
  if (!data.round_id) dotKey = 'waiting';
  else if (DRAWING_STATUSES.includes(data.status)) dotKey = 'drawing';
  else dotKey = 'open';

  const labelKey = data.round_id && data.status in CHAIN_STATUS_LABELS ? data.status : 'waiting';

  dot.className = 'status-dot status-' + dotKey;
  label.textContent = CHAIN_STATUS_LABELS[labelKey];
  block.textContent = 'Blocco ' + (data.chain_tip_height != null ? '#' + data.chain_tip_height : '—');

  document.getElementById('maintenance-banner').classList.toggle('hidden', !data.lottery_paused);
}

// After a couple of consecutive failed polls (network blip, server restart,
// tab suspended too long...), say so explicitly instead of silently leaving
// whatever status happened to be on screen — a frozen "Round aperto" that's
// actually minutes stale is worse than an honest "connessione persa".
const STALE_AFTER_FAILURES = 2;
let consecutiveFetchFailures = 0;

function showConnectionLost() {
  document.getElementById('chain-status-dot').className = 'status-dot status-offline';
  document.getElementById('chain-status-label').textContent = 'Connessione al server persa — riprovo…';
}

function noteFetchOutcome(ok) {
  if (ok) {
    consecutiveFetchFailures = 0;
    return;
  }
  consecutiveFetchFailures++;
  if (consecutiveFetchFailures >= STALE_AFTER_FAILURES) showConnectionLost();
}

let chainOnlyInterval = null;

async function refreshChainStatusOnly() {
  try {
    const data = await call('GET', '/rounds/current');
    updateChainStatusBar(data);
    noteFetchOutcome(true);
  } catch (e) {
    noteFetchOutcome(false);
  }
}

function startChainOnlyPolling() {
  refreshChainStatusOnly();
  clearInterval(chainOnlyInterval);
  chainOnlyInterval = setInterval(refreshChainStatusOnly, 15000);
}

function stopChainOnlyPolling() {
  clearInterval(chainOnlyInterval);
  chainOnlyInterval = null;
}

// Background tabs get their timers throttled hard by the browser (sometimes to
// once a minute or less) — waiting for the next lazy tick after the user comes
// back could show a stale round state for a while. Refresh immediately instead
// as soon as the tab becomes visible again.
document.addEventListener('visibilitychange', () => {
  if (document.visibilityState !== 'visible') return;
  if (chainOnlyInterval !== null) {
    refreshChainStatusOnly();
  } else if (token) {
    refreshRound();
    checkLastRoundResult();
  }
});

// The win/lose box's content lives in localStorage, not just in-memory state —
// a page reload (or a completely fresh tab) must be able to redraw it exactly
// as it was, without waiting for a new poll or re-running the reveal
// animation. This is the single source of truth for "what result box (if any)
// is currently shown"; refreshRound() and checkLastRoundResult() below both
// read/write it instead of keeping their own separate notion of "revealed".
const PERSISTED_RESULT_KEY = 'plm_persisted_result';

function getPersistedResult() {
  try {
    return JSON.parse(localStorage.getItem(PERSISTED_RESULT_KEY));
  } catch (e) {
    return null;
  }
}

function persistResult(roundId, won, amountSats) {
  localStorage.setItem(PERSISTED_RESULT_KEY, JSON.stringify({ round_id: roundId, won, amount_sats: amountSats }));
}

function clearPersistedResult() {
  localStorage.removeItem(PERSISTED_RESULT_KEY);
}

function renderPersistedResult(result) {
  setRoundInfoVisible(false);
  setResultBoxVisible(
    true,
    result.won ? '🎉 Hai vinto! +' + (result.amount_sats / SATS_PER_PLM) + ' PLM' : 'Non hai vinto questa volta.',
    result.won ? 'win' : 'lose'
  );
}

// The most recent round_id refreshRound() actually saw from the server (null
// meaning "confirmed no active round"; undefined meaning "haven't polled yet").
// Lets checkLastRoundResult() below avoid clobbering a round that's already
// known to be open/in-progress by the time its own (slower, DB-backed) request
// resolves.
let currentRoundIdSeen;

// Backstop for the live reveal in refreshRound(): that one only works if a poll
// happens to land while the round is still "paying_out" (winner_user_id is
// dropped from /rounds/current the instant the round flips to "closed" — see
// rounds/service.get_active_round). A backgrounded tab, a missed poll, or a
// late page load can miss that window entirely, in which case the live path
// never fires and the player would otherwise never learn the outcome. This
// reads GET /users/me/last-round-result, which reports the durable DB record
// instead of an ephemeral snapshot, so it always catches up eventually.
async function checkLastRoundResult() {
  if (!token) return;
  let data;
  try {
    data = await call('GET', '/users/me/last-round-result');
  } catch (e) {
    return; // silent — this is a backstop, refreshRound()'s own error handling already covers the primary path
  }
  if (data.round_id == null) return;
  const persisted = getPersistedResult();
  if (persisted && persisted.round_id === data.round_id) return; // already showing/known
  if (currentRoundIdSeen != null && currentRoundIdSeen !== data.round_id) return; // a newer round is already in progress on screen

  persistResult(data.round_id, data.won, data.amount_sats);
  renderPersistedResult({ won: data.won, amount_sats: data.amount_sats });
  if (data.won) {
    const won = data.amount_sats / SATS_PER_PLM;
    toast('Hai vinto il round #' + data.round_id + '! +' + won + ' PLM', 'success');
    refreshMe();
  }
}

let lastJackpotValue = null;

let timerHitZero = false;

function updateRoundTimer() {
  const el = document.getElementById('round-timer');
  if (!roundCloseAt) { el.textContent = '--:--'; timerHitZero = false; return; }
  const rawSec = Math.floor((roundCloseAt - serverNow()) / 1000);
  const totalSec = Math.max(0, rawSec);
  const mm = String(Math.floor(totalSec / 60)).padStart(2, '0');
  const ss = String(totalSec % 60).padStart(2, '0');
  el.textContent = mm + ':' + ss;

  // The countdown alone can't know the round actually closed server-side — poll
  // right away instead of waiting up to 15s for the next scheduled tick, so the
  // card doesn't sit on "00:00 · aperto" longer than necessary.
  if (rawSec <= 0 && !timerHitZero) {
    timerHitZero = true;
    refreshRound();
  } else if (rawSec > 0) {
    timerHitZero = false;
  }
}

// The round's normal info (title/timer/players/jackpot) vs. the drawing-phase
// spinner box vs. the personalized win/lose box are three independently
// toggled pieces, not three mutually-exclusive "screens" — during closing/
// drawing/paying_out, EVERY viewer sees the drawing box (generic phase
// progress), and a player who bet in that round ALSO sees the win/lose box at
// the same time once revealed, instead of the two fighting over one slot.
function setRoundInfoVisible(show) {
  document.getElementById('round-normal-row').classList.toggle('hidden', !show);
  document.getElementById('round-stats-row').classList.toggle('hidden', !show);
}

function setDrawingBoxVisible(show, label) {
  document.getElementById('draw-state').classList.toggle('active', show);
  if (show && label) document.getElementById('draw-label').textContent = label;
}

function setResultBoxVisible(show, html, cls) {
  const el = document.getElementById('draw-result');
  if (show) {
    el.className = 'draw-result ' + cls;
    el.innerHTML = html;
  }
  el.classList.toggle('hidden', !show);
}

function showNormalState() {
  setRoundInfoVisible(true);
  setDrawingBoxVisible(false);
  setResultBoxVisible(false);
}

async function refreshRound() {
  const seq = ++roundRequestSeq;
  const epoch = sessionEpoch;
  try {
    const data = await call('GET', '/rounds/current');
    if (epoch !== sessionEpoch) return; // session ended (or a new one started) while this was in flight
    if (seq < roundAppliedSeq) return; // a newer refreshRound() call already applied its result
    roundAppliedSeq = seq;
    noteFetchOutcome(true);
    updateChainStatusBar(data);
    document.getElementById('round-title').textContent = data.round_id
      ? 'Round #' + data.round_id + ' — ' + (ROUND_STATUS_LABELS[data.status] || data.status)
      : 'Nessun round attivo';
    document.getElementById('round-players').textContent = data.participant_count;
    const jackpotEl = document.getElementById('round-jackpot');
    const jackpotValue = data.jackpot_sats / SATS_PER_PLM;
    jackpotEl.textContent = jackpotValue;
    if (lastJackpotValue !== null && jackpotValue !== lastJackpotValue) {
      jackpotEl.classList.remove('jackpot-bump');
      void jackpotEl.offsetWidth; // restart the animation
      jackpotEl.classList.add('jackpot-bump');
    }
    lastJackpotValue = jackpotValue;
    if (data.server_time) serverTimeOffsetMs = new Date(data.server_time) - new Date();
    roundCloseAt = data.closes_at ? new Date(data.closes_at) : null;
    updateRoundTimer();

    currentRoundIdSeen = data.round_id || null;

    const isDrawing = data.round_id && DRAWING_STATUSES.includes(data.status);
    document.getElementById('round-card').classList.toggle('drawing-glow', !!isDrawing);
    const persisted = getPersistedResult();

    if (isDrawing) {
      setRoundInfoVisible(false);
      // The drawing-phase box (spinner + phase label) is generic status info —
      // every viewer sees it for the whole closing/drawing/paying_out phase,
      // regardless of whether they played in this round.
      setDrawingBoxVisible(true, drawingLabelFor(data));

      // The cosmetic reveal delay is anchored to the server's closes_at, not to
      // any client-side "when did I first see this" timestamp — a page reload
      // (or repeated reloads) can never reset it, since it's derived purely
      // from server-provided values that don't change for this round.
      const elapsedMs = serverNow() - new Date(data.closes_at);
      const minMs = data.draw_animation_seconds * 1000;
      const alreadyKnown = persisted && persisted.round_id === data.round_id;
      // myUserId may not be loaded yet on the very first tick after a reload
      // (refreshMe() and refreshRound() run concurrently) — fall back to the
      // persisted result rather than risk showing nothing or the wrong side.
      const canReveal =
        data.user_played && data.winner_user_id != null && (alreadyKnown || elapsedMs >= minMs) && myUserId != null;

      if (canReveal) {
        const won = data.winner_user_id === myUserId;
        if (!alreadyKnown) {
          persistResult(data.round_id, won, data.winner_amount_sats);
          if (won) {
            const wonAmount = (data.winner_amount_sats / SATS_PER_PLM);
            toast('Hai vinto il round #' + data.round_id + '! +' + wonAmount + ' PLM', 'success');
            refreshMe(); // the win toast is useless if the balance card still shows the pre-payout amount
          }
        }
        renderPersistedResult({ won, amount_sats: data.winner_amount_sats });
      } else if (alreadyKnown) {
        renderPersistedResult(persisted);
      } else {
        setResultBoxVisible(false);
      }
    } else {
      setDrawingBoxVisible(false);
      if (data.round_id && (!persisted || data.round_id !== persisted.round_id)) {
        // a genuinely new round is open — clear any previous result and go back to normal
        clearPersistedResult();
        showNormalState();
      } else if (!data.round_id && !persisted) {
        // nothing has ever been revealed and there's no active round — plain empty state
        showNormalState();
      } else if (persisted) {
        // no active round right now (cooldown, or a page reload after the round
        // fully closed) — keep the persisted result on screen regardless, until
        // a genuinely new round replaces it above.
        renderPersistedResult(persisted);
      }
    }

    scheduleNextRoundPoll(isDrawing);
  } catch (e) {
    if (epoch !== sessionEpoch) return; // session ended (or a new one started) while this was in flight
    noteFetchOutcome(false);
    scheduleNextRoundPoll(false);
  }
}

function scheduleNextRoundPoll(fast) {
  clearTimeout(roundPollTimeout);
  roundPollTimeout = setTimeout(refreshRound, fast ? 3000 : 15000);
}

async function showDashboard() {
  sessionEpoch++; // invalidate any dashboard poll chain left over from a previous login
  stopChainOnlyPolling();
  document.getElementById('landing-hero').classList.add('hidden');
  document.getElementById('auth-section').classList.add('hidden');
  document.getElementById('app-navbar').classList.remove('hidden');
  document.getElementById('dashboard-section').classList.remove('hidden');
  document.getElementById('dash-username').textContent = username;
  document.getElementById('dash-address').textContent = address;
  document.getElementById('dash-qr').src = '/qr/' + encodeURIComponent(address);
  // Render instantly from localStorage, before the network round-trip below —
  // otherwise a reload right after a win/lose flashes an empty round card for
  // a moment. refreshRound()'s own response reconciles this shortly after
  // (e.g. hides it again if a new round has since opened).
  const persisted = getPersistedResult();
  if (persisted) renderPersistedResult(persisted);
  // Awaited so myUserId is populated before refreshRound() decides whether
  // data.winner_user_id === myUserId — otherwise that comparison could race
  // against an unset myUserId right after a reload.
  await refreshMe();
  // Awaited too, and before refreshRound(): on a brand-new browser/device that
  // never saw this round live (nothing in localStorage), this is the only
  // thing that knows the outcome once the round has fully closed. Resolving
  // it first means refreshRound() finds the answer already in place instead
  // of momentarily rendering "no result" and then flipping to the win/lose
  // box a moment later once this backstop catches up.
  await checkLastRoundResult();
  refreshRound();
  clearInterval(lastResultInterval);
  lastResultInterval = setInterval(checkLastRoundResult, 20000);
  clearInterval(roundTimerInterval);
  roundTimerInterval = setInterval(updateRoundTimer, 1000);
}

function persistSession(data, u) {
  token = data.access_token; username = u; address = data.address;
  localStorage.setItem('plm_token', token);
  localStorage.setItem('plm_username', username);
  localStorage.setItem('plm_address', address);
}

async function register() {
  const btn = document.getElementById('register-btn');
  const u = document.getElementById('reg-username').value;
  const p = document.getElementById('reg-password').value;
  const pConfirm = document.getElementById('reg-password-confirm').value;
  if (p !== pConfirm) {
    toast('Le password non coincidono.', 'error');
    return;
  }
  await withLoading(btn, 'Creazione…', async () => {
    try {
      const data = await call('POST', '/auth/register', { username: u, password: p });
      persistSession(data, u);
      toast('Account creato.', 'success');
      showDashboard();
    } catch (e) {
      toast(e.message, 'error');
    }
  });
}

async function login() {
  const btn = document.getElementById('login-btn');
  const u = document.getElementById('login-username').value;
  const p = document.getElementById('login-password').value;
  await withLoading(btn, 'Accesso…', async () => {
    try {
      const data = await call('POST', '/auth/login', { username: u, password: p });
      persistSession(data, u);
      toast('Accesso riuscito.', 'success');
      showDashboard();
    } catch (e) {
      toast(e.message, 'error');
    }
  });
}

function resetToLoggedOutUI() {
  sessionEpoch++; // invalidate any refreshRound() still in flight from the dashboard we're leaving
  token = username = address = null;
  myUserId = null;
  currentRoundIdSeen = undefined;
  clearInterval(roundTimerInterval);
  clearTimeout(roundPollTimeout);
  clearInterval(lastResultInterval);
  lastResultInterval = null;
  document.getElementById('app-navbar').classList.add('hidden');
  document.getElementById('dashboard-section').classList.add('hidden');
  document.getElementById('auth-section').classList.remove('hidden');
  document.getElementById('landing-hero').classList.remove('hidden');
  startChainOnlyPolling();
}

function logout() {
  localStorage.clear();
  resetToLoggedOutUI();
}

// Fires in every OTHER tab of this origin when one tab clears/changes plm_token
// (e.g. via logout()) — keeps all open tabs in sync instead of leaving stale
// ones showing a dashboard for a session that no longer exists anywhere else.
window.addEventListener('storage', (event) => {
  if (event.key === 'plm_token' && !event.newValue) {
    resetToLoggedOutUI();
  }
});

// Bfcache restores a frozen snapshot of the DOM/JS state from before the user
// navigated away, without re-running this script — so a stale "logged in" (or
// stale "logged out") view could persist across back/forward navigation. Cache-
// Control: no-store on this response should already prevent that, but re-derive
// the UI from storage here too as a safety net for browsers that ignore it.
window.addEventListener('pageshow', (event) => {
  if (event.persisted) initAuthState();
});

function initAuthState() {
  token = localStorage.getItem('plm_token');
  username = localStorage.getItem('plm_username');
  address = localStorage.getItem('plm_address');
  if (token) {
    showDashboard();
  } else {
    resetToLoggedOutUI();
  }
}

async function copyAddress() {
  try {
    await navigator.clipboard.writeText(address);
    toast('Indirizzo copiato.', 'success');
  } catch (e) {
    toast('Impossibile copiare automaticamente.', 'error');
  }
}

let myUserId = null;
let myBalanceSats = 0; // confirmed, spendable balance — what withdrawals/bets can actually draw from

// Shows the pending-inclusive balance (confirmed + own change still unconfirmed
// in a broadcast bet/withdrawal — see compute_pending_balance in
// app/wallet/balance.py) so the number doesn't drop by more than the amount
// actually spent while a tx is in flight. Green once settled, amber while
// has_pending is true so it's clear the figure isn't final yet.
function setBalanceDisplay(elementId, pendingBalanceSats, hasPending) {
  const el = document.getElementById(elementId);
  el.textContent = pendingBalanceSats / SATS_PER_PLM;
  el.classList.toggle('balance-pending', hasPending);
  el.classList.toggle('balance-confirmed', !hasPending);
}

async function refreshMe() {
  const btn = document.getElementById('refresh-btn');
  await withLoading(btn, '…', async () => {
    try {
      const data = await call('GET', '/users/me');
      myUserId = data.id;
      myBalanceSats = data.balance_sats;
      setBalanceDisplay('dash-balance', data.pending_balance_sats, data.has_pending);
      document.getElementById('navbar-balance').textContent = (data.pending_balance_sats / SATS_PER_PLM) + ' PLM';
      document.getElementById('navbar-balance').classList.toggle('balance-pending', data.has_pending);
      document.getElementById('navbar-balance').classList.toggle('balance-confirmed', !data.has_pending);
      document.getElementById('profile-username').textContent = data.username;
      document.getElementById('profile-address').textContent = data.address;
      setBalanceDisplay('profile-balance', data.pending_balance_sats, data.has_pending);
      document.getElementById('profile-created-at').textContent = new Date(data.created_at).toLocaleDateString('it-IT');
      document.getElementById('wd-full-amount-value').textContent = data.balance_sats / SATS_PER_PLM;
      if (document.getElementById('wd-full-amount').checked) {
        document.getElementById('wd-amount').value = data.balance_sats / SATS_PER_PLM;
      }
    } catch (e) {
      toast(e.message, 'error');
    }
  });
}

function toggleWithdrawFullAmount() {
  const checked = document.getElementById('wd-full-amount').checked;
  const amountInput = document.getElementById('wd-amount');
  amountInput.disabled = checked;
  if (checked) amountInput.value = myBalanceSats / SATS_PER_PLM;
}

async function changePassword() {
  const btn = document.getElementById('change-password-btn');
  const currentPassword = document.getElementById('settings-current-password').value;
  const newPassword = document.getElementById('settings-new-password').value;
  const newPasswordConfirm = document.getElementById('settings-new-password-confirm').value;

  if (newPassword !== newPasswordConfirm) {
    toast('Le nuove password non coincidono.', 'error');
    return;
  }
  if (newPassword.length < 8) {
    toast('La nuova password deve avere almeno 8 caratteri.', 'error');
    return;
  }

  await withLoading(btn, 'Aggiornamento…', async () => {
    try {
      await call('POST', '/users/me/change-password', {
        current_password: currentPassword,
        new_password: newPassword,
      });
      document.getElementById('settings-current-password').value = '';
      document.getElementById('settings-new-password').value = '';
      document.getElementById('settings-new-password-confirm').value = '';
      toast('Password aggiornata.', 'success');
    } catch (e) {
      toast(e.message, 'error');
    }
  });
}

async function placeBet() {
  const btn = document.getElementById('bet-btn');
  await withLoading(btn, 'Invio bet…', async () => {
    try {
      const data = await call('POST', '/bets', {});
      toast('Bet piazzata sul round #' + data.round_id + '.', 'success');
    } catch (e) {
      toast(e.message, 'error');
    }
  });
  refreshMe();
  refreshRound();
}

async function withdraw() {
  const btn = document.getElementById('withdraw-btn');
  const ext = document.getElementById('wd-address').value;
  const isFullAmount = document.getElementById('wd-full-amount').checked;
  const amtSats = isFullAmount
    ? myBalanceSats
    : Math.round(parseFloat(document.getElementById('wd-amount').value) * SATS_PER_PLM);
  await withLoading(btn, 'Invio…', async () => {
    try {
      await call('POST', '/withdrawals', { external_address: ext, amount_sats: amtSats });
      toast('Withdrawal inviato.', 'success');
      document.getElementById('wd-full-amount').checked = false;
      toggleWithdrawFullAmount();
      document.getElementById('wd-amount').value = '';
    } catch (e) {
      toast(e.message, 'error');
    }
  });
  refreshMe();
}

// Server push: an SSE channel that notifies the instant round/bet/balance
// state changes anywhere (see app/rounds/events.py), instead of everyone
// waiting for their next poll tick. The message carries no payload — it just
// means "something changed", so we react by immediately re-running the same
// refreshes the polling loop would eventually do on its own. Polling is left
// completely in place as a fallback: if this connection is blocked/dropped
// (proxy, browser setting, flaky network), the page keeps working exactly as
// before, just without the instant nudge.
let roundEventSource = null;

function onRoundServerEvent() {
  if (token) {
    refreshRound();
    refreshMe();
    checkLastRoundResult();
  } else {
    refreshChainStatusOnly();
  }
}

function connectRoundEvents() {
  if (roundEventSource) return;
  roundEventSource = new EventSource('/rounds/stream');
  roundEventSource.addEventListener('update', onRoundServerEvent);
  // Fires on the initial connection AND every successful auto-reconnect (the
  // browser retries this on its own after a drop) — re-syncs immediately
  // instead of leaving the page on whatever it last knew until the next event
  // or poll tick, which would otherwise widen the "missed while disconnected"
  // window to the full reconnect gap.
  roundEventSource.addEventListener('open', onRoundServerEvent);
}

connectRoundEvents();
initAuthState();
</script>

</body>
</html>