const fs = require('fs');
const path = require('path');
const imagemin = require('imagemin');
const imageminPngquant = require('imagemin-pngquant');

// 源目录和目标目录
const srcDir = path.join(__dirname, 'src', 'assets');
const destDir = path.join(__dirname, 'src', 'assets'); // 直接覆盖原文件

// 优化PNG图片的函数
async function optimizePng() {
  try {
    console.log('开始优化PNG图片...');
    
    // 读取源目录下的所有PNG图片
    const files = await imagemin([`${srcDir}/*.png`], {
      destination: destDir,
      plugins: [
        imageminPngquant({
          quality: [0.6, 0.8] // 质量范围
        })
      ]
    });
    
    console.log('PNG图片优化完成！');
    console.log('优化的文件:');
    
    // 计算并显示优化前后的文件大小对比
    for (const file of files) {
      const srcPath = path.join(srcDir, path.basename(file.sourcePath));
      const destPath = file.destinationPath;
      
      const srcStats = fs.statSync(srcPath);
      const destStats = fs.statSync(destPath);
      
      const srcSize = srcStats.size;
      const destSize = destStats.size;
      const reduction = ((srcSize - destSize) / srcSize * 100).toFixed(2);
      
      console.log(`${path.basename(file.sourcePath)}: ${(srcSize / 1024).toFixed(2)}KB → ${(destSize / 1024).toFixed(2)}KB (减少${reduction}%)`);
    }
    
  } catch (error) {
    console.error('优化PNG图片时出错:', error);
  }
}

// 执行优化
optimizePng();