require('dotenv').config();
const { createClient } = require('webdav');
const fs = require('fs');
const path = require('path');

// init db
const low = require('lowdb');
const FileSync = require('lowdb/adapters/FileSync');
const adapter = new FileSync('db.json');
const db = low(adapter);
// db.defaults({ files: [], count: 0}).write();

// create webdav-client
const client = createClient(
  process.env.WEBDAV_URL,
  {
      username: process.env.WEBDAV_USER,
      password: process.env.WEBDAV_PW
  }
);


async function listDir(dir = process.env.WEBFRAME_PATH) {
  const directoryItems = await client.getDirectoryContents(dir);
  return directoryItems;
}

function dlFile(file, dir = process.env.WEBFRAME_PATH) {
  return client.createReadStream(dir+'/'+file).pipe(fs.createWriteStream('./files/'+file));
}

client.exists(process.env.WEBFRAME_PATH).then(async data => {
  if (data) {
    const list = await listDir(process.env.WEBFRAME_PATH);
    list.forEach(file => {
      // if (!fs.existsSync('./files/'+file.basename)) { 
      const inDb = db.get('files').find({ basename: file.basename }).value() !== undefined ? true : false;
      if (!inDb) {
        dlFile(file.basename);
        db.get('files').push(file).write();
        db.update('count', n => n + 1).write();
      }
    });
  }  
});

// webserver
const express = require('express');
const app = express();

app.use('/files', express.static(path.join(__dirname, 'files')));
app.get('/api/files', (req, res) => {
  res.json(db.get('files').value());
});
app.use('*', express.static(path.join(__dirname, 'public')));
app.listen(process.env.PORT, () => console.log(`Example app listening at http://localhost:${process.env.PORT}`));