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block content
  .post
    h1.post-title(onclick="copyUrlSegment()")= page.title

    //- 放在正文内容之前（推荐，一打开页面就能看到热力图）
    if page.heatmap
      include _partial/heatmap.pug

    .post-content
      != page.content

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block content
  .post
    h1.post-title(onclick="copyUrlSegment()")= page.title
    .post-meta= page.date.format(config.date_format)

    //- 放在.post-meta之后.post-content之前，与它们平级
    if page.heatmap
      div(style="margin: 2rem 0;") 
        include _partial/heatmap.pug

  .post-content
    != page.content

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---
title: INDEX
date: 2025-09-30 09:08:27
heatmap: true
---

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//- 1. 数据预处理
-
  var yearWeekData = {};
  var yearsSet = new Set();
  
  site.posts.forEach(function(post) {
    var y = post.date.isoWeekYear();
    var w = post.date.isoWeek();
    yearsSet.add(y);
    
    var key = y + '-' + w;
    if (!yearWeekData[key]) {
      yearWeekData[key] = { count: 0, posts: [] };
    }
    yearWeekData[key].count += 1;
    yearWeekData[key].posts.push({
      title: post.title,
      link: url_for(post.path)
    });
  });
  
  var allYears = Array.from(yearsSet).sort(function(a, b){ return b - a });
  if(allYears.length === 0) allYears = [new Date().getFullYear()];
  var maxYear = allYears[0];
  var minYear = allYears[allYears.length - 1];
  
  var displayYears = [];
  for(var i = maxYear; i >= minYear; i--) {
    displayYears.push(i);
  }

//- 2. DOM 结构
#heatmap-container
  #tooltip

//- 3. 样式表
style.
  #heatmap-container {
    width: 100%;
    overflow: visible;
    margin-top: 40px;
    margin-bottom: 30px;
  }
  
  .heatmap-cell {
    rx: 1.5px;
    ry: 1.5px;
    transition: opacity 0.2s ease;
    stroke: none !important;
  }
  
  .heatmap-cell.has-post {
    cursor: default; /* 改为默认箭头，因为现在不直接点击色块了 */
  }
  
  .heatmap-cell:hover {
    opacity: 0.5;
  }
  
  .year-text, .legend-text, .legend-number, #tooltip {
    font-family: 'Source Han Serif SC', 'Source Han Serif', 'Noto Serif CJK SC', serif;
  }
  
  .year-text {
    font-size: 14px;
    font-weight: bold;
    fill: #888888;
  }
  
  .legend-text {
    font-size: 14px;
    fill: #333333;
    font-weight: bold;
  }
  
  .legend-number {
    font-size: 13px;
    fill: #888888;
  }
  
  html[data-dark="true"] .legend-text { fill: #dddddd; }
  html[data-dark="true"] .year-text,
  html[data-dark="true"] .legend-number { fill: #777777; }
  
  /* Tooltip 样式：删除了 pointer-events: none，加入隐藏机制 */
  #tooltip {
    position: absolute;
    background-color: rgba(255, 255, 255, 0.98);
    color: #222222;
    border: 1px solid #e0e0e0;
    border-radius: 2px;
    padding: 10px 14px;
    opacity: 0;
    visibility: hidden; /* 默认隐藏，防止阻挡正常页面点击 */
    font-size: 13px;
    transform: translate(-50%, -100%);
    line-height: 1.6;
    z-index: 1000;
    white-space: nowrap;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  }
  
  /* 优雅的链接样式 */
  #tooltip a {
    color: inherit;
    text-decoration: none;
    display: block;
    border-bottom: 1px dashed rgba(136, 136, 136, 0.3);
    padding: 2px 0;
    transition: all 0.2s ease;
  }
  #tooltip a:last-child {
    border-bottom: none;
  }
  #tooltip a:hover {
    color: #000;
    border-bottom: 1px solid #000;
  }
  
  html[data-dark="true"] #tooltip {
    background-color: rgba(30, 30, 30, 0.98);
    color: #dddddd;
    border: 1px solid #444444;
    box-shadow: 0 4px 12px rgba(0,0,0,0.6);
  }
  
  html[data-dark="true"] #tooltip a:hover {
    color: #fff;
    border-bottom: 1px solid #fff;
  }

//- 4. 脚本逻辑
script(src="https://d3js.org/d3.v5.min.js")
script.
  document.addEventListener("DOMContentLoaded", function () {
    var data = !{JSON.stringify(yearWeekData)};
    var displayYears = !{JSON.stringify(displayYears)};
    
    var fullGrid = [];
    displayYears.forEach(function(y, rowIdx) {
      for(var w = 1; w <= 53; w++) {
        var key = y + '-' + w;
        var cellData = data[key] || { count: 0, posts: [] };
        fullGrid.push({
          year: y,
          week: w,
          row: rowIdx,
          col: w - 1,
          count: cellData.count,
          posts: cellData.posts
        });
      }
    });

    var cellWidth = 10;
    var cellHeight = 16.18; 
    var cellPaddingX = 3; 
    var cellPaddingY = 8; 
    var labelWidth = 50; 
    var topMargin = 45;  
    
    var width = labelWidth + (53 * (cellWidth + cellPaddingX));
    var height = topMargin + (displayYears.length * (cellHeight + cellPaddingY));

    var svg = d3.select("#heatmap-container").append("svg")
      .attr("viewBox", "0 0 " + width + " " + height)
      .attr("preserveAspectRatio", "xMidYMid meet");

    function getFillColor(count, isDark) {
      if (isDark) {
        if (count === 0) return "#1e1e1e"; 
        if (count === 1) return "#3a3a3a";
        if (count === 2) return "#5c5c5c";
        if (count === 3) return "#858585";
        return "#b3b3b3"; 
      } else {
        if (count === 0) return "#ebebeb"; 
        if (count === 1) return "#c2c2c2";
        if (count === 2) return "#949494";
        if (count === 3) return "#666666";
        return "#333333"; 
      }
    }

    svg.append("text")
      .attr("class", "legend-text")
      .attr("x", 0)
      .attr("y", 16)
      .text("Posts by week");
      
    var legendCounts = [0, 1, 2, 3, 4];
    var legendGroup = svg.append("g").attr("transform", "translate(125, 4)"); 
    var legendSpacing = 42; 

    legendGroup.selectAll("rect")
      .data(legendCounts)
      .enter().append("rect")
      .attr("class", "heatmap-cell")
      .attr("width", cellWidth)
      .attr("height", cellHeight)
      .attr("x", function(d, i) { return i * legendSpacing; })
      .attr("y", 0);
      
    legendGroup.selectAll("text")
      .data(["0", "1", "2", "3", "4+"])
      .enter().append("text")
      .attr("class", "legend-number")
      .attr("x", function(d, i) { return i * legendSpacing + cellWidth + 6; }) 
      .attr("y", 13)
      .text(function(d) { return d; });

    svg.selectAll(".year-text.axis")
      .data(displayYears)
      .enter().append("text")
      .attr("class", "year-text axis")
      .attr("x", 0)
      .attr("y", function(d, i) { 
        return topMargin + i * (cellHeight + cellPaddingY) + cellHeight - 3; 
      })
      .text(function(d) { return d; });

    var gridGroup = svg.append("g")
      .attr("transform", "translate(" + labelWidth + "," + topMargin + ")");

    var cells = gridGroup.selectAll(".heatmap-cell.grid-cell")
      .data(fullGrid)
      .enter().append("rect")
      .attr("class", function(d) { return "heatmap-cell grid-cell" + (d.count > 0 ? " has-post" : ""); })
      .attr("width", cellWidth)
      .attr("height", cellHeight)
      .attr("x", function(d) { return d.col * (cellWidth + cellPaddingX); })
      .attr("y", function(d) { return d.row * (cellHeight + cellPaddingY); });

    // 【核心改进】：增加缓冲计时器，解决鼠标移动时的断层消失问题
    var hideTimeout;
    var tooltip = d3.select("#tooltip");

    cells.on("mouseover", function(d) {
      if (d.count > 0) {
        clearTimeout(hideTimeout);
        tooltip.style("visibility", "visible").transition().duration(200).style("opacity", 1);
        
        // 渲染顶部周次说明，以及下方的文章可点击链接
        var text = "<div style='margin-bottom: 8px; font-weight: bold; color: #888; font-size: 11px; border-bottom: 1px solid #eee; padding-bottom: 4px;'>" + d.year + "年 第" + d.week + "周 (" + d.count + "篇)</div>";
        d.posts.forEach(function(p) {
          text += "<a href='" + p.link + "'>" + p.title + "</a>";
        });
        tooltip.html(text);
        
        var cellBox = this.getBoundingClientRect();
        tooltip.style("left", (cellBox.left + cellBox.width / 2) + "px")
               .style("top", (cellBox.top - 8 + window.scrollY) + "px");
      }
    })
    .on("mouseout", function() {
      // 离开色块时，给用户留出 250 毫秒的移动缓冲时间
      hideTimeout = setTimeout(function() {
        tooltip.transition().duration(200).style("opacity", 0).on("end", function() {
          d3.select(this).style("visibility", "hidden");
        });
      }, 250);
    });

    // 为 Tooltip 本身增加事件，确保鼠标悬停在框内时不消失
    tooltip.on("mouseover", function() {
      clearTimeout(hideTimeout);
      d3.select(this).style("opacity", 1).style("visibility", "visible");
    })
    .on("mouseout", function() {
      // 鼠标离开悬浮框，彻底隐藏
      hideTimeout = setTimeout(function() {
        tooltip.transition().duration(200).style("opacity", 0).on("end", function() {
          d3.select(this).style("visibility", "hidden");
        });
      }, 250);
    });

    function updateCellStyles() {
      var isDarkTheme = document.querySelector('html').dataset.dark === 'true';
      legendGroup.selectAll("rect").style("fill", function(d, i) {
        return getFillColor(i, isDarkTheme);
      });
      cells.style("fill", function(d) {
        return getFillColor(d.count, isDarkTheme);
      });
      
      // 暗黑模式下，Tooltip 内的分割线也要适应变暗
      if(isDarkTheme) {
        document.querySelectorAll('#tooltip div').forEach(el => el.style.borderBottom = '1px solid #444');
      } else {
        document.querySelectorAll('#tooltip div').forEach(el => el.style.borderBottom = '1px solid #eee');
      }
    }

    updateCellStyles();

    document.body.addEventListener("themechange", function () {
      updateCellStyles();
    });
  });