/**
 * Require necessary libraries
 */
const fs = require('fs')
const bodyParser = require('body-parser')
const jsonServer = require('json-server')
const jwt = require('jsonwebtoken')
const bcrypt = require('bcrypt')
//const open = require('open');
const path = require('path');
const scanPhoto = require('./scanphoto.js')


// JWT confing data
const SECRET_KEY = '123456789'
const expiresIn = '1h'

// Create server
var server = jsonServer.create()

// Create router
if(fs.existsSync('./api_v1/db.json')){
   var router = jsonServer.router('./api_v1/db.json')
} else {
    const initialData = fs.readFileSync('api_v1/initialDB.json', 'utf8');
    // to update (sync) current database (db.json) file
    fs.writeFileSync('api_v1/db.json', initialData);
    var router = jsonServer.router('./api_v1/db.json')
}

// Create router
var router = jsonServer.router('./api_v1/db.json')

// Users database
const userdb = JSON.parse(fs.readFileSync('./api_v1/users.json', 'UTF-8'))

// Default middlewares
server.use(bodyParser.urlencoded({ extended: true }))
server.use(bodyParser.json())

// Create a token from a payload
function createToken(payload) {
  return jwt.sign(payload, SECRET_KEY, { expiresIn })
}

// Verify the token
function verifyToken(token) {
  return jwt.verify(
    token,
    SECRET_KEY,
    (err, decode) => (decode !== undefined ? decode : err)
  )
}

// Check if the user exists in database
function isAuthenticated({ email, password }) {
  return (
    userdb.users.findIndex(
      user =>
        user.email === email && bcrypt.compareSync(password, user.password)
    ) !== -1
  )
}

function azz(){
    const initialData = fs.readFileSync('api_v1/initialDB.json', 'utf8');
    // to update (sync) current database (db.json) file
    fs.writeFileSync('api_v1/db.json', initialData);
    router.db.setState(JSON.parse(initialData));
    console.log('DB resettato');
}

// con 192.168.1.3:7771/ apre http:192.168.1.3:7771/public.index.html 
server.get('/', (req, res) => {
  //console.log(req.query)
  res.sendFile(path.resolve("public/index.html"))
})
// scansiona le foto
server.get('/scan', async (req, res) => {
  azz();
  await scanPhoto('./public/photos/original')
  console.log("Ricaricato")
  res.send({status: 'Ricaricato'})
})


// esempio http:192.168.1.3:7771/files?file=mio.txt
server.get('/files', (req, res) => {
  console.log(req.query)
  res.sendFile(path.resolve("public/"+req.query.file))
})

server.get('/initDB1',(req, res, next) => {
    const Data = { photos: []};
    // to update (sync) current database (db.json) file
    fs.writeFileSync('api_v1/db.json', JSON.stringify(Data));
    router.db.setState(Data);
    res.send({status: 'DB resettato'});
    //res.sendStatus(200);
});

server.get('/initDB',(req, res, next) => {
    const initialData = fs.readFileSync('api_v1/initialDB.json', 'utf8');
    // to update (sync) current database (db.json) file
    fs.writeFileSync('api_v1/db.json', initialData);
    router.db.setState(JSON.parse(initialData));
    //router = jsonServer.router('./api_v1/db.json')
    res.send({status: 'DB resettato'});
    //res.sendStatus(200);
});

server.get('/log', (req, res) => {
   console.log(server)
})

server.use((req, res, next) => {
  //console.log(req.headers);
  //console.log(req.method);
  var a = req.path.split("/");
  if (req.method === 'GET' && a[1] == 'pub' && a.length > 2) {
    //console.log(req.headers.host);
    //console.log(a.slice(2).join("/"));
    res.status(200).sendFile(path.resolve("public/"+a.slice(2).join("/")));
    //res.sendStatus(200);
  } else {
    next();
  }
})

/**
 * Method: POST
 * Endpoint: /auth/login
 */
server.post('/auth/login', (req, res) => {
  const { email, password } = req.body
  if (isAuthenticated({ email, password }) === false) {
    const status = 401
    const message = 'Incorrect email or password'
    res.status(status).json({ status, message })
    return
  }
  const token = createToken({ email, password })
  res.status(200).json({ token })
})

/**
 * Middleware: Check authorization
 */
server.use(/^(?!\/auth).*$/, (req, res, next) => {
  if (
    req.headers.authorization === undefined ||
    req.headers.authorization.split(' ')[0] !== 'Bearer'
  ) {
    const status = 401
    const message = 'Bad authorization header'
    res.status(status).json({ status, message })
    return
  }
  try {
    verifyToken(req.headers.authorization.split(' ')[1])
    next()
  } catch (err) {
    const status = 401
    const message = 'Error: access_token is not valid'
    res.status(status).json({ status, message })
  }
})

// Server mount
server.use(router)
server.listen(3000, () => {
  console.log('Auth API server runing on port 3000 ...')
})