const fs = require('fs');
const path = require('path');

// dist 目录路径，根据你项目实际情况修改
const DIST_DIR = path.join(__dirname, 'dist');

// 递归统计文件大小
function getFiles(dir) {
  let results = [];
  const list = fs.readdirSync(dir);
  list.forEach(file => {
    const filePath = path.join(dir, file);
    const stat = fs.statSync(filePath);
    if (stat && stat.isDirectory()) {
      results = results.concat(getFiles(filePath));
    } else {
      results.push({ path: filePath, size: stat.size });
    }
  });
  return results;
}

function formatSize(bytes) {
  if (bytes < 1024) return bytes + ' B';
  if (bytes < 1024 * 1024) return (bytes / 1024).toFixed(2) + ' KB';
  return (bytes / (1024 * 1024)).toFixed(2) + ' MB';
}

function analyze() {
  if (!fs.existsSync(DIST_DIR)) {
    console.warn('dist 目录不存在，请先执行 taro build --type weapp');
    return;
  }

  const files = getFiles(DIST_DIR);
  const total = files.reduce((sum, f) => sum + f.size, 0);

  console.log('文件大小分析（按从大到小排序）:');
  files
    .sort((a, b) => b.size - a.size)
    .forEach(f => {
      console.log(
        `${formatSize(f.size)} | ${(f.size / total * 100).toFixed(2)}% | ${path.relative(DIST_DIR, f.path)}`
      );
    });

  console.log(`\n总大小: ${formatSize(total)}`);
}

analyze();