const express = require('express');
const router = express.Router();
const os = require('os');
const child_process = require('child_process');
const packageJson = require('../package.json');
const fs = require('fs');
const path = require('path');
const crypto = require('crypto');

function getAllFiles(dirPath, arrayOfFiles) {
  const files = fs.readdirSync(dirPath);

  arrayOfFiles = arrayOfFiles || [];

  files.forEach(function(file) {
    if (fs.statSync(dirPath + "/" + file).isDirectory()) {
      arrayOfFiles = getAllFiles(dirPath + "/" + file, arrayOfFiles);
    } else {
      arrayOfFiles.push(path.join(dirPath, "/", file));
    }
  });

  return arrayOfFiles;
}

function bytesToSize(bytes) {
   const sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB'];
   if (bytes == 0) return '0 Byte';
   const i = parseInt(Math.floor(Math.log(bytes) / Math.log(1024)));
   return Math.round(bytes / Math.pow(1024, i), 2) + ' ' + sizes[i];
}

function calculateBuildSize(files) {
  let totalSize = 0;

  files.forEach(file => {
    const stats = fs.statSync(file);
    totalSize += stats.size;
  });

  return totalSize;
}

router.get('/', async (req, res) => {
  try {

    const clientIp = req.headers['cf-connecting-ip'] || req.ip;
    const version = packageJson.version;
    const expressVersion = require('express/package.json').version;

    const buildMetadata = {
      build_version: version,
      node_version: process.version,
      express_version: expressVersion,
      build_sha: '',
      os_type: os.type(),
      os_release: os.release(),
    };

    const hash = crypto.createHash('md5');
    hash.update(buildMetadata.build_version);
    buildMetadata.build_sha = hash.digest('hex').substring(0, 32);

    res.json(buildMetadata);
  } catch (error) {
    console.error('Error in /build-metadata: ', error);
    res.status(500).send('Error in /build-metadata: ' + error.toString());
  }
});

module.exports = router;