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<!DOCTYPE html>
<html lang="zh-CN">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
  <title>Excel 行合并工具</title>
  <script src="https://cdn.sheetjs.com/xlsx-0.20.0/package/dist/xlsx.full.min.js"></script>
  <style>
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
      background: linear-gradient(135deg, #f5f7fa 0%, #e4edf9 100%);
      min-height: 100vh;
      display: flex;
      justify-content: center;
      align-items: center;
      padding: 20px;
    }

    .card {
      background: white;
      border-radius: 16px;
      box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1);
      width: 100%;
      max-width: 520px;
      padding: 32px;
    }

    h1 {
      text-align: center;
      color: #2c3e50;
      margin-bottom: 24px;
      font-size: 24px;
      font-weight: 600;
    }

    .input-group {
      margin-bottom: 20px;
    }

    label {
      display: block;
      margin-bottom: 8px;
      color: #34495e;
      font-weight: 500;
    }

    input[type="file"] {
      width: 100%;
      padding: 10px;
      border: 2px dashed #cbd5e0;
      border-radius: 8px;
      background: #f8fafc;
      cursor: pointer;
      transition: border-color 0.3s;
    }

    input[type="file"]:hover {
      border-color: #a0aec0;
    }

    .options {
      background: #f8fafc;
      padding: 16px;
      border-radius: 12px;
      margin-bottom: 24px;
      border: 1px solid #edf2f7;
    }

    .option-row {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 10px;
    }

    .option-row:last-child {
      margin-bottom: 0;
    }

    input[type="checkbox"] {
      transform: scale(1.2);
      cursor: pointer;
    }

    input[type="number"] {
      width: 80px;
      padding: 6px 10px;
      border: 1px solid #cbd5e0;
      border-radius: 6px;
      font-size: 14px;
    }

    button {
      width: 100%;
      padding: 12px;
      background: #4299e1;
      color: white;
      border: none;
      border-radius: 8px;
      font-size: 16px;
      font-weight: 600;
      cursor: pointer;
      transition: background 0.3s, transform 0.2s;
    }

    button:hover {
      background: #3182ce;
      transform: translateY(-2px);
    }

    button:active {
      transform: translateY(0);
    }

    #status {
      margin-top: 16px;
      min-height: 24px;
      text-align: center;
      font-size: 14px;
      font-weight: 500;
    }

    .success { color: #38a169; }
    .error { color: #e53e3e; }

    footer {
      text-align: center;
      margin-top: 20px;
      color: #718096;
      font-size: 12px;
    }
  </style>
</head>
<body>
  <div class="card">
    <h1>Excel 行合并工具</h1>

    <div class="input-group">
      <label for="fileInput">📎 选择 Excel 文件 (.xlsx)</label>
      <input type="file" id="fileInput" accept=".xlsx" />
    </div>

    <div class="options">
      <div class="option-row">
        <input type="checkbox" id="hasHeader" checked />
        <label for="hasHeader" style="margin: 0;">包含表头</label>
      </div>
      <div class="option-row">
        <label for="startRow" style="margin: 0;">从第</label>
        <input type="number" id="startRow" value="2" min="1" />
        <label for="startRow" style="margin: 0;">行开始处理</label>
      </div>
    </div>

    <button id="processBtn">🚀 开始合并</button>
    <div id="status"></div>

    <footer>
      所有文件在浏览器中处理，不会上传到任何服务器。
    </footer>
  </div>

  <script>
    document.getElementById('processBtn').addEventListener('click', async () => {
      const fileInput = document.getElementById('fileInput');
      const hasHeader = document.getElementById('hasHeader').checked;
      const startRow = parseInt(document.getElementById('startRow').value);
      const statusEl = document.getElementById('status');

      if (!fileInput.files[0]) {
        statusEl.className = 'error';
        statusEl.textContent = '⚠️ 请先选择一个 Excel 文件！';
        return;
      }

      if (isNaN(startRow) || startRow < 1) {
        statusEl.className = 'error';
        statusEl.textContent = '⚠️ 起始行号必须 ≥ 1！';
        return;
      }

      try {
        statusEl.className = '';
        statusEl.textContent = '⏳ 正在处理，请稍候...';

        const file = fileInput.files[0];
        const data = await file.arrayBuffer();
        const workbook = XLSX.read(data, { type: 'array' });
        const sheetName = workbook.SheetNames[0];
        const worksheet = workbook.Sheets[sheetName];

        const rawData = XLSX.utils.sheet_to_json(worksheet, { header: 1 });
        if (rawData.length === 0) throw new Error('工作表为空');

        let outputData = [];

        if (hasHeader) {
          outputData.push(rawData[0]);
        }

        let actualStart = hasHeader ? Math.max(1, startRow - 1) : startRow - 1;
        const rows = rawData.slice(actualStart);

        for (let i = 0; i < rows.length; i += 2) {
          const row1 = rows[i] || [];
          const row2 = rows[i + 1] || [];
          const mergedRow = [];

          const maxLen = Math.max(row1.length, row2.length);
          for (let j = 0; j < maxLen; j++) {
            const cell1 = row1[j];
            const cell2 = row2[j];

            if (cell1 !== undefined && cell1 !== null && cell1 !== '') {
              mergedRow.push(cell1);
            } else if (cell2 !== undefined && cell2 !== null && cell2 !== '') {
              mergedRow.push(cell2);
            } else {
              mergedRow.push('');
            }
          }
          outputData.push(mergedRow);
        }

        const newWorksheet = XLSX.utils.aoa_to_sheet(outputData);
        const newWorkbook = XLSX.utils.book_new();
        XLSX.utils.book_append_sheet(newWorkbook, newWorksheet, '合并结果');

        const outputName = file.name.replace(/\.xlsx?$/i, '_merged.xlsx');
        XLSX.writeFile(newWorkbook, outputName);

        statusEl.className = 'success';
        statusEl.textContent = '✅ 合并完成！文件已下载。';
      } catch (e) {
        console.error(e);
        statusEl.className = 'error';
        statusEl.textContent = '❌ 处理失败：' + (e.message || '未知错误');
      }
    });
  </script>
</body>
</html>