(function (global) {
  function fmtQuotePx(n) {
    const v = Number(n);
    if (!Number.isFinite(v)) return "—";
    const abs = Math.abs(v);
    let digits = 2;
    if (abs >= 10000) digits = 1;
    else if (abs >= 1) digits = 2;
    else digits = 4;
    try {
      return v.toLocaleString("en-US", {
        minimumFractionDigits: digits,
        maximumFractionDigits: digits,
      });
    } catch (e) {
      return v.toFixed(digits);
    }
  }

  function fmtQuoteSigned(n, isPct) {
    const v = Number(n);
    if (!Number.isFinite(v)) return "—";
    const abs = Math.abs(v);
    const digits = isPct ? 2 : abs >= 100 ? 1 : 2;
    let body;
    try {
      body = abs.toLocaleString("en-US", {
        minimumFractionDigits: digits,
        maximumFractionDigits: digits,
      });
    } catch (e) {
      body = abs.toFixed(digits);
    }
    const sign = v > 0 ? "" : v < 0 ? "-" : "";
    return sign + body + (isPct ? "%" : "");
  }

  function quoteDirClass(n) {
    const v = Number(n);
    if (!Number.isFinite(v) || v === 0) return "nav-spot--flat";
    return v > 0 ? "nav-spot--up" : "nav-spot--down";
  }

  function snapshotTickers(row) {
    const snap = (row && row.snapshot) || {};
    const quotes = snap.quotes && typeof snap.quotes === "object" ? snap.quotes : {};
    const list = quotes.tickers;
    return Array.isArray(list) ? list : [];
  }

  function tickersHaveLast(tickers) {
    return (tickers || []).some(function (t) {
      return t && t.last != null && t.last !== "" && Number.isFinite(Number(t.last));
    });
  }

  function pickQuoteSource(list) {
    let best = null;
    (list || []).forEach(function (row) {
      if (!row || !row.online) return;
      const tickers = snapshotTickers(row);
      if (!tickersHaveLast(tickers)) return;
      const mode = String((((row.snapshot || {}).instance || {}).mode) || "").toLowerCase();
      const live = mode === "live" ? 1 : 0;
      const pulled = String(row.pulled_at || ((row.snapshot || {}).quotes || {}).updated_at || "");
      const cand = { tickers: tickers, name: row.name || "", live: live, pulled: pulled };
      if (!best) {
        best = cand;
        return;
      }
      if (cand.live !== best.live) {
        if (cand.live > best.live) best = cand;
        return;
      }
      if (cand.pulled > best.pulled) best = cand;
    });
    return best;
  }

  function paintRoot(root, tickers, src) {
    ["ETH", "BTC"].forEach(function (base) {
      const row = root.querySelector('.nav-spot-row[data-base="' + base + '"]');
      if (!row) return;
      let t = null;
      for (let i = 0; i < tickers.length; i++) {
        if (String((tickers[i] && tickers[i].base) || "").toUpperCase() === base) {
          t = tickers[i];
          break;
        }
      }
      row.classList.remove("nav-spot--up", "nav-spot--down", "nav-spot--flat");
      const lastEl = row.querySelector('[data-field="last"]');
      const chgEl = row.querySelector('[data-field="change"]');
      const pctEl = row.querySelector('[data-field="change_pct"]');
      if (!t || t.last == null) {
        row.classList.add("nav-spot--flat");
        if (lastEl) lastEl.textContent = "—";
        if (chgEl) chgEl.textContent = "—";
        if (pctEl) pctEl.textContent = "—";
        return;
      }
      row.classList.add(quoteDirClass(t.change));
      if (lastEl) lastEl.textContent = fmtQuotePx(t.last);
      if (chgEl) chgEl.textContent = fmtQuoteSigned(t.change, false);
      if (pctEl) pctEl.textContent = fmtQuoteSigned(t.change_pct, true);
    });
    if (src && src.name) {
      root.title =
        "来自 " +
        src.name +
        (src.live ? " · live" : " · sim") +
        " · 相对北京 08:00";
    } else {
      root.title = "暂无在线客户端报价 · 相对北京 08:00";
    }
  }

  function paint(list) {
    const src = pickQuoteSource(list);
    const tickers = src ? src.tickers : [];
    document.querySelectorAll("[data-hub-quotes]").forEach(function (root) {
      paintRoot(root, tickers, src);
    });
  }

  let timer = null;
  let inflight = false;

  async function refresh() {
    if (inflight) return;
    inflight = true;
    try {
      const r = await fetch("/api/overview");
      const d = await r.json();
      paint((d && d.instances) || []);
    } catch (e) {
      paint([]);
    } finally {
      inflight = false;
    }
  }

  function boot() {
    if (!document.querySelector("[data-hub-quotes]")) return;
    if (global.HubOverview) return;
    refresh();
    if (timer) clearInterval(timer);
    timer = setInterval(refresh, 10000);
  }

  global.HubQuotes = { boot: boot, paint: paint, refresh: refresh };
})(window);