/**
 * 中控行情区：单图 + 周期切换，数据来自 /api/chart/ohlcv（本地库优先）。
 */
(function () {
  const TF_ORDER = ["1m", "5m", "15m", "1h", "4h", "1d", "1w"];
  const chartHost = document.getElementById("market-chart");
  if (!chartHost) return;

  const elExchange = document.getElementById("market-exchange");
  const elSymbol = document.getElementById("market-symbol");
  const elTf = document.getElementById("market-timeframe");
  const elRefresh = document.getElementById("market-refresh");
  const elStatus = document.getElementById("market-status");
  const elUpdated = document.getElementById("market-updated");
  const elO = document.getElementById("mkt-o");
  const elH = document.getElementById("mkt-h");
  const elL = document.getElementById("mkt-l");
  const elC = document.getElementById("mkt-c");
  const elV = document.getElementById("mkt-v");
  const elSymLabel = document.getElementById("mkt-symbol-label");
  const elTfLabel = document.getElementById("mkt-tf-label");

  let chart = null;
  let candleSeries = null;
  let priceTick = null;
  let rangeMarkers = [];
  let lastCandles = [];
  let chartMeta = null;
  let loadToken = 0;
  let marketInited = false;

  function fmtVol(v) {
    if (v == null || Number.isNaN(Number(v))) return "-";
    const n = Number(v);
    if (n >= 1e9) return (n / 1e9).toFixed(2) + "B";
    if (n >= 1e6) return (n / 1e6).toFixed(2) + "M";
    if (n >= 1e3) return (n / 1e3).toFixed(2) + "K";
    return n.toFixed(2);
  }

  function paintOhlcv(bar) {
    if (!bar) {
      ["o", "h", "l", "c", "v"].forEach(function (k) {
        const el = { o: elO, h: elH, l: elL, c: elC, v: elV }[k];
        if (el) el.textContent = "-";
      });
      return;
    }
    if (elO) elO.textContent = bar.open != null ? String(bar.open) : "-";
    if (elH) elH.textContent = bar.high != null ? String(bar.high) : "-";
    if (elL) elL.textContent = bar.low != null ? String(bar.low) : "-";
    if (elC) elC.textContent = bar.close != null ? String(bar.close) : "-";
    if (elV) elV.textContent = fmtVol(bar.volume);
  }

  function ensureChart() {
    if (chart && candleSeries) return true;
    if (!window.LightweightCharts) {
      if (elStatus) {
        elStatus.className = "market-status err";
        elStatus.textContent = "图表库加载失败";
      }
      return false;
    }
    chart = LightweightCharts.createChart(chartHost, {
      layout: { background: { color: "#0a1018" }, textColor: "#b8d4e8" },
      grid: { vertLines: { color: "#1a2838" }, horzLines: { color: "#1a2838" } },
      rightPriceScale: { borderColor: "#2a4058" },
      timeScale: { borderColor: "#2a4058", timeVisible: true, secondsVisible: false },
      crosshair: { mode: LightweightCharts.CrosshairMode ? LightweightCharts.CrosshairMode.Normal : 0 },
    });
    const opts = {
      upColor: "#00ff9d",
      downColor: "#ff4d6d",
      borderVisible: false,
      wickUpColor: "#00ff9d",
      wickDownColor: "#ff4d6d",
    };
    if (typeof chart.addCandlestickSeries === "function") {
      candleSeries = chart.addCandlestickSeries(opts);
    } else if (
      typeof chart.addSeries === "function" &&
      window.LightweightCharts &&
      window.LightweightCharts.CandlestickSeries
    ) {
      candleSeries = chart.addSeries(window.LightweightCharts.CandlestickSeries, opts);
    }
    if (!candleSeries) return false;

    chart.subscribeCrosshairMove(function (param) {
      if (!param || !param.time || !param.seriesData) return;
      const d = param.seriesData.get(candleSeries);
      if (!d) return;
      paintOhlcv({
        open: d.open,
        high: d.high,
        low: d.low,
        close: d.close,
        volume: d.volume,
      });
    });

    window.addEventListener("resize", function () {
      if (!chart) return;
      chart.applyOptions({ width: chartHost.clientWidth, height: chartHost.clientHeight });
    });
    chart.applyOptions({ width: chartHost.clientWidth, height: chartHost.clientHeight });
    return true;
  }

  function clearMarkers() {
    rangeMarkers.forEach(function (m) {
      try {
        candleSeries.removePriceLine(m);
      } catch (e) {}
    });
    rangeMarkers = [];
  }

  function addRangeMarkers(data) {
    clearMarkers();
    if (!candleSeries || !data) return;
    const hi = data.range_high;
    const lo = data.range_low;
    if (hi && hi.price != null) {
      rangeMarkers.push(
        candleSeries.createPriceLine({
          price: Number(hi.price),
          color: "#ffb84d",
          lineWidth: 1,
          lineStyle: 2,
          axisLabelVisible: true,
          title: "区间高",
        })
      );
    }
    if (lo && lo.price != null) {
      rangeMarkers.push(
        candleSeries.createPriceLine({
          price: Number(lo.price),
          color: "#4cd97f",
          lineWidth: 1,
          lineStyle: 2,
          axisLabelVisible: true,
          title: "区间低",
        })
      );
    }
  }

  function readQuery() {
    const qs = new URLSearchParams(window.location.search);
    const ex = qs.get("exchange_key") || qs.get("exchange") || "";
    const sym = qs.get("symbol") || "";
    const tf = qs.get("timeframe") || "";
    if (ex && elExchange) elExchange.value = ex;
    if (sym && elSymbol) elSymbol.value = sym;
    if (tf && elTf) elTf.value = tf;
  }

  async function loadMeta() {
    const r = await fetch("/api/chart/meta", { credentials: "same-origin" });
    chartMeta = await r.json();
    if (!elExchange || !chartMeta.exchanges) return;
    elExchange.innerHTML = "";
    chartMeta.exchanges.forEach(function (ex) {
      const opt = document.createElement("option");
      opt.value = ex.key || ex.id;
      opt.textContent = ex.name || ex.key;
      elExchange.appendChild(opt);
    });
    readQuery();
  }

  async function loadChart(force) {
    if (!ensureChart()) return;
    const exKey = (elExchange && elExchange.value) || "";
    const sym = (elSymbol && elSymbol.value.trim().toUpperCase()) || "";
    const tf = (elTf && elTf.value) || "5m";
    if (!exKey || !sym) {
      if (elStatus) {
        elStatus.className = "market-status err";
        elStatus.textContent = "请选择交易所并输入币种";
      }
      return;
    }
    const myToken = ++loadToken;
    if (elStatus) {
      elStatus.className = "market-status";
      elStatus.textContent = "加载中…";
    }
    if (elSymLabel) elSymLabel.textContent = sym;
    if (elTfLabel) elTfLabel.textContent = tf;

    const qs = new URLSearchParams({
      exchange_key: exKey,
      symbol: sym,
      timeframe: tf,
    });
    if (force) qs.set("refresh", "1");

    try {
      const r = await fetch("/api/chart/ohlcv?" + qs.toString(), { credentials: "same-origin" });
      const data = await r.json();
      if (myToken !== loadToken) return;
      if (!r.ok) {
        throw new Error(data.detail || data.msg || "请求失败");
      }
      if (!data.ok || !data.candles || !data.candles.length) {
        throw new Error(data.msg || "无 K 线");
      }

      priceTick = data.price_tick;
      lastCandles = data.candles;
      candleSeries.setData(data.candles);
      chart.timeScale().fitContent();
      addRangeMarkers(data);

      const ohlcv = data.ohlcv || {};
      paintOhlcv({
        open: ohlcv.open,
        high: ohlcv.high,
        low: ohlcv.low,
        close: ohlcv.close,
        volume: ohlcv.volume,
      });

      let hint =
        "已加载 " +
        data.candles.length +
        " 根（库 " +
        (data.from_cache || 0) +
        " / 新拉 " +
        (data.fetched || 0) +
        "）· 保留 " +
        (data.retention_days || 15) +
        " 天";
      if (data.stale && data.stale_message) {
        hint += " · 缓存：" + data.stale_message;
      }
      if (elStatus) {
        elStatus.className = data.stale ? "market-status warn" : "market-status";
        elStatus.textContent = hint;
      }
      if (elUpdated) elUpdated.textContent = data.updated_at || "--";
    } catch (e) {
      if (myToken !== loadToken) return;
      if (elStatus) {
        elStatus.className = "market-status err";
        elStatus.textContent = String(e.message || e);
      }
    }
  }

  function bind() {
    if (elRefresh) {
      elRefresh.addEventListener("click", function () {
        loadChart(true);
      });
    }
    if (elTf) {
      elTf.addEventListener("change", function () {
        loadChart(false);
      });
    }
    if (elExchange) {
      elExchange.addEventListener("change", function () {
        loadChart(false);
      });
    }
    if (elSymbol) {
      elSymbol.addEventListener("keydown", function (e) {
        if (e.key === "Enter") loadChart(false);
      });
    }
    const btnLoad = document.getElementById("market-load");
    if (btnLoad) btnLoad.addEventListener("click", function () {
      loadChart(false);
    });
  }

  window.hubMarketChart = {
    init: async function () {
      if (!marketInited) {
        marketInited = true;
        await loadMeta();
        bind();
      }
      await loadChart(false);
    },
    reload: function (force) {
      loadChart(!!force);
    },
  };

  if (document.getElementById("page-market") && !document.getElementById("page-market").classList.contains("hidden")) {
    window.hubMarketChart.init();
  }
})();