const express = require('express');
const bodyParser = require('body-parser');
const fs = require('fs-extra')

const app = express();

app.use(express.json({ limit: '50mb' }));
app.use(express.urlencoded({ limit: '50mb', extended: true }));

// 处理 POST 请求
function getId(html) {
  var x = 'class=link01><A href="search.exe?COMM_GRECNO=';
  var y = html.split(x)[1];
  return parseInt(y.substring(0, y.indexOf('&')));
}

function getNext() {
  // return Math.floor(Math.random() * max) + 1;
  for (let i = 1; ;++i) {
  const dir = Math.floor(i/1000).toString();
  if (!fs.existsSync('html/' + dir + '/' +  i + '.html')) {
    return i;
  }
  }
}

const max = 1231692;

app.post('/upload', async (req, res) => {
  const body = req.body;
  const id = getId(body.document);
  if (isNaN(id)) {
    console.log('err', body.document);
    process.exit();
    return;
  }
  if (id > max) {
    process.exit();
    return;
  }
  console.log(id)
  const dir = Math.floor(id/1000).toString();
  if (!await fs.exists('html/' + dir + '/' +  id + '.html')) {
    await fs.ensureDir('html/' + dir)
    await fs.writeFile('html/' + dir + '/' +  id + '.html', body.document)
    res.send('goto:file:///C:/DTWXJS/WHB/html/cgi-bin/SEARCH.EXE?COMM_RECNO='+(id+1).toString()+'&COMM_RLTID=32');
  } else {
    console.log('exists', id);
    const next = getNext();
    res.send('goto:file:///C:/DTWXJS/WHB/html/cgi-bin/SEARCH.EXE?COMM_RECNO='+next+'&COMM_RLTID=32');
  }
});

app.listen(3000, () => {
  console.log('Server started on port 3000');
});