/** 复盘四周期蜡烛图：围绕成交裁剪窗口，入场/出场轻量标注 */
(function () {
  var TF_MAX = { M1: 90, M5: 48, M15: 36, H1: 24 };

  function num(v) {
    if (v == null || v === "") return null;
    var n = Number(v);
    return Number.isFinite(n) ? n : null;
  }

  function nearestBarIndex(bars, ts) {
    if (ts == null || !bars.length) return -1;
    var best = 0;
    var bestDiff = Math.abs(Number(bars[0].ts) - ts);
    for (var i = 1; i < bars.length; i++) {
      var d = Math.abs(Number(bars[i].ts) - ts);
      if (d < bestDiff) {
        bestDiff = d;
        best = i;
      }
    }
    return best;
  }

  /** 只保留成交前后一段，避免 M1 挤满、H1 太空 */
  function cropBars(bars, markers, tf) {
    if (!bars.length) return bars;
    var maxN = TF_MAX[tf] || 60;
    if (bars.length <= maxN) return bars;

    var a = nearestBarIndex(bars, markers.openTs);
    var b = markers.closeTs != null ? nearestBarIndex(bars, markers.closeTs) : a;
    if (a < 0) a = Math.floor(bars.length / 2);
    if (b < 0) b = a;
    var lo = Math.min(a, b);
    var hi = Math.max(a, b);
    var span = hi - lo + 1;
    var pad = Math.max(8, Math.floor((maxN - span) / 2));
    var start = Math.max(0, lo - pad);
    var end = Math.min(bars.length, start + maxN);
    start = Math.max(0, end - maxN);
    return bars.slice(start, end);
  }

  function drawCandleChart(canvas, bars, markers, tf) {
    if (!canvas || !bars || !bars.length) return;
    bars = cropBars(bars, markers || {}, tf);
    markers = markers || {};

    var dpr = window.devicePixelRatio || 1;
    var cssW = canvas.clientWidth || 400;
    var cssH = canvas.clientHeight || 200;
    canvas.width = cssW * dpr;
    canvas.height = cssH * dpr;
    var ctx = canvas.getContext("2d");
    ctx.setTransform(dpr, 0, 0, dpr, 0, 0);

    var padL = 6;
    var padR = 56; // 右侧留给价签
    var padT = 10;
    var padB = 6;

    var min = Infinity;
    var max = -Infinity;
    bars.forEach(function (b) {
      min = Math.min(min, b.low);
      max = Math.max(max, b.high);
    });
    if (markers.openPrice != null) {
      min = Math.min(min, markers.openPrice);
      max = Math.max(max, markers.openPrice);
    }
    if (markers.closePrice != null) {
      min = Math.min(min, markers.closePrice);
      max = Math.max(max, markers.closePrice);
    }
    if (!(max > min)) max = min + 1;
    var padPrice = (max - min) * 0.08 || 0.8;
    min -= padPrice;
    max += padPrice;

    var w = cssW - padL - padR;
    var h = cssH - padT - padB;
    var n = bars.length;
    var slot = w / n;

    ctx.clearRect(0, 0, cssW, cssH);
    ctx.fillStyle = "#0e0e18";
    ctx.fillRect(0, 0, cssW, cssH);

    var yOf = function (p) {
      return padT + ((max - p) / (max - min)) * h;
    };
    var xOf = function (i) {
      return padL + i * slot + slot * 0.5;
    };

    // K 线
    var bodyW = Math.max(1.5, Math.min(8, slot * 0.55));
    bars.forEach(function (b, i) {
      var x = xOf(i);
      var up = b.close >= b.open;
      ctx.strokeStyle = up ? "#0ecb81" : "#f6465d";
      ctx.fillStyle = ctx.strokeStyle;
      ctx.lineWidth = 1;
      ctx.beginPath();
      ctx.moveTo(x, yOf(b.high));
      ctx.lineTo(x, yOf(b.low));
      ctx.stroke();
      var y1 = yOf(b.open);
      var y2 = yOf(b.close);
      var top = Math.min(y1, y2);
      var bh = Math.max(1, Math.abs(y2 - y1));
      ctx.fillRect(x - bodyW / 2, top, bodyW, bh);
    });

    var entryColor = "#4cc2ff";
    var exitColor = "#f0b429";
    var entryIdx = nearestBarIndex(bars, markers.openTs);
    var exitIdx =
      markers.closeTs != null ? nearestBarIndex(bars, markers.closeTs) : -1;
    var hasExit =
      markers.closeTs != null &&
      markers.closePrice != null &&
      exitIdx >= 0;

    var openP = markers.openPrice;
    var closeP = markers.closePrice;
    var samePrice =
      openP != null &&
      closeP != null &&
      Math.abs(openP - closeP) < 0.08;

    // 价格横线：价差很小时只画一条，避免两行字叠在一起
    function drawHLine(price, color) {
      var y = yOf(price);
      ctx.save();
      ctx.strokeStyle = color;
      ctx.globalAlpha = 0.7;
      ctx.lineWidth = 1;
      ctx.setLineDash([4, 3]);
      ctx.beginPath();
      ctx.moveTo(padL, y);
      ctx.lineTo(padL + w, y);
      ctx.stroke();
      ctx.restore();
      return y;
    }

    function drawRightTag(y, text, color, dy) {
      dy = dy || 0;
      var ty = Math.max(padT + 10, Math.min(cssH - padB - 4, y + dy));
      ctx.save();
      ctx.font = "11px Microsoft YaHei UI, sans-serif";
      ctx.fillStyle = color;
      ctx.textAlign = "left";
      ctx.textBaseline = "middle";
      ctx.fillText(text, padL + w + 4, ty);
      ctx.restore();
    }

    if (samePrice && openP != null) {
      var ySame = drawHLine(openP, entryColor);
      drawRightTag(ySame, "入/出 " + openP.toFixed(2), entryColor, 0);
    } else {
      if (openP != null) {
        var yIn = drawHLine(openP, entryColor);
        drawRightTag(yIn, "入 " + openP.toFixed(2), entryColor, 0);
      }
      if (hasExit && closeP != null) {
        var yOut = drawHLine(closeP, exitColor);
        var dy = 0;
        if (openP != null && Math.abs(yOf(openP) - yOut) < 14) {
          dy = yOut < yOf(openP) ? -12 : 12;
        }
        drawRightTag(yOut, "出 " + closeP.toFixed(2), exitColor, dy);
      }
    }

    // 点：无竖线、无三角、无紫连线 —— 只留圆点 + 短字
    function drawDot(i, price, color, label, labelSide) {
      if (i < 0 || price == null) return;
      var x = xOf(i);
      var y = yOf(price);
      ctx.save();
      ctx.beginPath();
      ctx.arc(x, y, 4, 0, Math.PI * 2);
      ctx.fillStyle = color;
      ctx.fill();
      ctx.lineWidth = 1.5;
      ctx.strokeStyle = "#0e0e18";
      ctx.stroke();

      ctx.font = "bold 10px Microsoft YaHei UI, sans-serif";
      ctx.fillStyle = color;
      ctx.textBaseline = "bottom";
      if (labelSide === "left") {
        ctx.textAlign = "right";
        ctx.fillText(label, x - 7, y - 4);
      } else if (labelSide === "right") {
        ctx.textAlign = "left";
        ctx.fillText(label, x + 7, y - 4);
      } else {
        ctx.textAlign = "center";
        ctx.fillText(label, x, y - 7);
      }
      ctx.restore();
    }

    var closeTogether =
      hasExit && entryIdx >= 0 && Math.abs(exitIdx - entryIdx) <= 2;

    if (entryIdx >= 0 && openP != null) {
      drawDot(
        entryIdx,
        openP,
        entryColor,
        "入",
        closeTogether ? "left" : "center"
      );
    }
    if (hasExit) {
      drawDot(
        exitIdx,
        closeP,
        exitColor,
        "出",
        closeTogether ? "right" : "center"
      );
    }
  }

  function readMarkers(el) {
    return {
      openTs: num(el.dataset.openTs),
      closeTs: num(el.dataset.closeTs),
      openPrice: num(el.dataset.openPrice),
      closePrice: num(el.dataset.closePrice),
      side: el.dataset.side || "",
    };
  }

  function paintAll() {
    document.querySelectorAll("canvas.chart-canvas").forEach(function (el) {
      try {
        var bars = JSON.parse(el.dataset.bars || "[]");
        var tf = (el.dataset.tf || el.id || "").replace(/^chart-/, "") || "M1";
        drawCandleChart(el, bars, readMarkers(el), tf);
      } catch (e) {
        console.warn(e);
      }
    });
  }

  paintAll();
  window.addEventListener("resize", paintAll);
})();