#!/usr/bin/env node

const fs = require('fs');
const path = require('path');
const { optimize } = require('svgo');

// SVG优化配置
const svgoConfig = {
  multipass: true,
  plugins: [
    {
      name: 'preset-default',
      params: {
        overrides: {
          removeViewBox: false,
          cleanupIds: false,
        },
      },
    },
    'removeDimensions',
    'removeStyleElement',
    'removeScriptElement',
    'removeComments',
    'removeMetadata',
    'removeEditorsNSData',
    'cleanupListOfValues',
    'convertStyleToAttrs',
    'removeEmptyContainers',
    'mergePaths',
    'convertShapeToPath',
    'sortAttrs',
    'removeDimensions',
  ],
};

// 递归遍历目录
function walkDir(dir, callback) {
  fs.readdirSync(dir).forEach(file => {
    const filePath = path.join(dir, file);
    const stat = fs.statSync(filePath);

    if (stat.isDirectory()) {
      walkDir(filePath, callback);
    } else if (path.extname(file) === '.svg') {
      callback(filePath);
    }
  });
}

// 优化单个SVG文件
function optimizeSvg(filePath) {
  try {
    const svgContent = fs.readFileSync(filePath, 'utf8');
    const originalSize = Buffer.byteLength(svgContent, 'utf8');

    const result = optimize(svgContent, {
      path: filePath,
      ...svgoConfig,
    });

    const optimizedSize = Buffer.byteLength(result.data, 'utf8');
    const savings = ((1 - optimizedSize / originalSize) * 100).toFixed(1);

    fs.writeFileSync(filePath, result.data);

    console.log(`✓ ${path.relative(process.cwd(), filePath)}: ${originalSize}B → ${optimizedSize}B (节省 ${savings}%)`);

    return { originalSize, optimizedSize, savings: parseFloat(savings) };
  } catch (error) {
    console.error(`✗ 处理文件失败: ${filePath}`, error.message);
    return null;
  }
}

// 主函数
function main() {
  const publicDir = path.join(process.cwd(), 'public');

  console.log('开始优化SVG文件...\n');

  let totalOriginal = 0;
  let totalOptimized = 0;
  let fileCount = 0;

  walkDir(publicDir, (filePath) => {
    const result = optimizeSvg(filePath);
    if (result) {
      totalOriginal += result.originalSize;
      totalOptimized += result.optimizedSize;
      fileCount++;
    }
  });

  const totalSavings = ((1 - totalOptimized / totalOriginal) * 100).toFixed(1);

  console.log('\n优化完成！');
  console.log(`处理文件: ${fileCount} 个`);
  console.log(`原始大小: ${(totalOriginal / 1024).toFixed(2)} KB`);
  console.log(`优化后: ${(totalOptimized / 1024).toFixed(2)} KB`);
  console.log(`总共节省: ${totalSavings}% (${((totalOriginal - totalOptimized) / 1024).toFixed(2)} KB)`);
}

main();