/**
 * 顶栏右上角 ETH/BTC 实时报价(公共 ticker).
 */
(function (global) {
  const BASES = ["ETH", "BTC"];

  function $(id) {
    return document.getElementById(id);
  }

  function refreshMs() {
    const raw = document.body && document.body.getAttribute("data-price-refresh-ms");
    const n = Number(raw);
    return n > 2000 ? n : 5000;
  }

  function fmtLast(base, v) {
    if (v == null || Number.isNaN(Number(v))) return "—";
    const n = Number(v);
    if (base === "BTC") {
      return n.toLocaleString("en-US", { minimumFractionDigits: 1, maximumFractionDigits: 1 });
    }
    return n.toLocaleString("en-US", { minimumFractionDigits: 2, maximumFractionDigits: 2 });
  }

  function fmtChg(base, v) {
    if (v == null || Number.isNaN(Number(v))) return "—";
    const n = Number(v);
    const abs = Math.abs(n);
    const body =
      base === "BTC"
        ? abs.toLocaleString("en-US", { minimumFractionDigits: 1, maximumFractionDigits: 1 })
        : abs.toLocaleString("en-US", { minimumFractionDigits: 2, maximumFractionDigits: 2 });
    if (n > 0) return "+" + body;
    if (n < 0) return "-" + body;
    return body;
  }

  function fmtPct(v) {
    if (v == null || Number.isNaN(Number(v))) return "—";
    const n = Number(v);
    const body = Math.abs(n).toFixed(2) + "%";
    if (n > 0) return "+" + body;
    if (n < 0) return "-" + body;
    return body;
  }

  function paintRow(row, q) {
    if (!row || !q) return;
    const last = row.querySelector('[data-hlq="last"]');
    const chg = row.querySelector('[data-hlq="chg"]');
    const pct = row.querySelector('[data-hlq="pct"]');
    const base = row.getAttribute("data-base") || "";
    if (last) last.textContent = fmtLast(base, q.last);
    if (chg) chg.textContent = fmtChg(base, q.change);
    if (pct) pct.textContent = fmtPct(q.pct);
    const up = Number(q.change) > 0 || Number(q.pct) > 0;
    const down = Number(q.change) < 0 || Number(q.pct) < 0;
    row.classList.toggle("is-up", up);
    row.classList.toggle("is-down", down);
  }

  async function fetchQuotes() {
    const r = await fetch("/api/header-quotes", {
      credentials: "same-origin",
      cache: "no-store",
    });
    const d = await r.json();
    if (!d || !d.ok) throw new Error((d && d.msg) || "行情失败");
    return d.quotes || [];
  }

  async function tick() {
    const host = $("header-live-quotes");
    if (!host) return;
    try {
      const quotes = await fetchQuotes();
      BASES.forEach(function (base) {
        const row = host.querySelector('.hlq-row[data-base="' + base + '"]');
        const q = quotes.find(function (x) {
          return String((x && x.base) || "").toUpperCase() === base;
        });
        if (row && q && !q.error) paintRow(row, q);
      });
    } catch (_) {
      /* 静默:保持上次有效行情 */
    }
  }

  let timer = null;
  function boot() {
    if (!$("header-live-quotes")) return;
    void tick();
    if (timer) clearInterval(timer);
    timer = setInterval(function () {
      void tick();
    }, refreshMs());
  }

  if (document.readyState === "loading") {
    document.addEventListener("DOMContentLoaded", boot);
  } else {
    boot();
  }

  global.HeaderLiveQuotes = { refresh: tick, boot: boot };
})(window);