/* ----------------------------------------------------------------------------

 Question Server
 GitLab: <https://gitlab.com/YourFriendlyNeighborhoodDealer/question-node-server>

 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program. If not, see <https://www.gnu.org/licenses/>.

 ------------------------------------------------------------------------- */

const startHTTPS = true
const siteUrl = 'https://qmining.tk' // http(s)//asd.basd
const ircURL = 'https://kiwiirc.com/nextclient/irc.sub.fm/#qmining'

const express = require('express')
const bodyParser = require('body-parser')
const busboy = require('connect-busboy')
const fs = require('fs')
const app = express()
const http = require('http')
const https = require('https')

const logger = require('./logger.js')
const utils = require('./utils.js')
const actions = require('./actions.js')
const stat = require('./stat.js')

const listedFiles = './public/files'
const recivedFiles = 'public/recivedfiles'
const uloadFiles = 'public/f'
const staticFile = 'public/data/static'
const dataFile = 'public/data.json'
const msgFile = 'stats/msgs'

// https://certbot.eff.org/
const privkeyFile = '/etc/letsencrypt/live/qmining.tk/privkey.pem'
const fullchainFile = '/etc/letsencrypt/live/qmining.tk/fullchain.pem'
const chainFile = '/etc/letsencrypt/live/qmining.tk/chain.pem'

var certsLoaded = false
if (startHTTPS && utils.FileExists(privkeyFile) && utils.FileExists(fullchainFile) && utils.FileExists(
  chainFile)) {
  try {
    const key = fs.readFileSync(privkeyFile, 'utf8')
    const cert = fs.readFileSync(fullchainFile, 'utf8')
    const ca = fs.readFileSync(chainFile, 'utf8')
    var certs = {
      key: key,
      cert: cert,
      ca: ca
    }
    certsLoaded = true
  } catch (e) {
    logger.Log('Error loading cert files!', logger.GetColor('redbg'))
  }
}

const port = 8080
const httpsPort = 8443

app.set('view engine', 'ejs')
app.use(function (req, res, next) {
  res.on('finish', function () {
    logger.LogReq(req, true, res.statusCode)
    if (res.statusCode !== 404) { stat.LogStat(req.url) }
  })
  next()
})
app.use(express.static('public'))
app.use(busboy({
  limits: {
    fileSize: 10000 * 1024 * 1024
  }
}))
app.use(bodyParser.json())
app.use(bodyParser.urlencoded({
  limit: '5mb',
  extended: true
}))
app.use(bodyParser.json({
  limit: '5mb'
}))

// --------------------------------------------------------------

app.get('/', function (req, res) {
  // req.hostname

  res.render('main', {
    siteurl: siteUrl,
    qa: actions.ProcessQA()
  })
  res.end()
})

app.get('/sio', function (req, res) {
  res.render('uload')
  res.end()
})

app.get('/manual', function (req, res) {
  res.render('man')
  res.end()
  logger.LogReq(req)
})

app.get('/public', function (req, res) {
  var response = '@Plz update :)'
  response += utils.ReadFile(staticFile)
  res.write(response)
  res.end()
})

app.get('/static', function (req, res) {
  var response = '@Plz update :)'
  response += utils.ReadFile(staticFile)
  res.write(response)
  res.end()
})

app.get('/legacy', function (req, res) {
  var f = utils.ReadFile(dataFile)
  var d = actions.LoadJSON(f)
  let qcount = 0
  for (let i = 0; i < d.length; i++) { qcount += d.Subjects[i].length }
  let scount = d.length

  res.render('alldata', {
    data: d,
    scount: scount,
    qcount: qcount,
    siteurl: siteUrl
  })

  logger.LogReq(req)
})

app.post('/postfeedback', function (req, res) {
  res.redirect('back')
  logger.Log('New feedback message', logger.GetColor('bluebg'), true)
  utils.AppendToFile('\n\n' + logger.GetDateString() + ': ' + req.body.message_field, msgFile)
})

app.get('/postfeedback', function (req, res) {
  // TODO: res.redirect("/"); or if needs this anyways, becouse /postfeedback post handler already
  // redirects
  res.render('main', {
    sdata: utils.ReadFile(staticFile)
  })
})

app.post('/isAdding', function (req, res) {
  res.end('OK')
  logger.LogReq(req)
  actions.ProcessIncomingRequest(req.body.datatoadd)
  utils.WriteBackup()
})

app.get('/lred', function (req, res) {
  res.redirect('/legacy')
  res.end()
  logger.LogReq(req)
})

app.get('/menuClick', function (req, res) {
  res.redirect('/')
  res.end()
  logger.LogReq(req)
})

app.get('/irc', function (req, res) {
  res.redirect(ircURL)
  res.end()
  logger.LogReq(req)
})

// all questions readable
app.get('/allqr', function (req, res) {
  var f = utils.ReadFile(dataFile)
  var d = actions.LoadJSON(f)

  res.render('allqr', {
    d: d.toString().split('\n')
  })
  logger.LogReq(req)
})

app.get('/greasy', function (req, res) {
  res.redirect('https://greasyfork.org/en/scripts/38999-moodle-elearning-kmooc-test-help')
  res.end()
  logger.LogReq(req)
})

app.get('/scriptgit', function (req, res) {
  res.redirect('https://gitlab.com/YourFriendlyNeighborhoodDealer/moodle-test-userscript')
  res.end()
  logger.LogReq(req)
})

app.get('/servergit', function (req, res) {
  res.redirect('https://gitlab.com/YourFriendlyNeighborhoodDealer/question-node-server')
  res.end()
  logger.LogReq(req)
})

function UploadFile (req, res, path, next) {
  var fstream
  req.pipe(req.busboy)
  req.busboy.on('file', function (fieldname, file, filename) {
    logger.Log('Uploading: ' + filename, logger.GetColor('blue'))

    utils.CreatePath(path, true)
    let d = new Date()
    let fn = d.getHours() + '' + d.getMinutes() + '' + d.getSeconds() + '_' + filename

    fstream = fs.createWriteStream(path + '/' + fn)
    file.pipe(fstream)
    fstream.on('close', function () {
      logger.Log('Upload Finished of ' + path + '/' + fn, logger.GetColor('blue'))
      next(fn)
    })
    fstream.on('error', function (err) {
      console.log(err)
      res.end('something bad happened :s')
    })
  })
}

app.route('/fosuploader').post(function (req, res, next) {
  UploadFile(req, res, uloadFiles, (fn) => {
    res.redirect('/f/' + fn)
  })
})

app.route('/badtestsender').post(function (req, res, next) {
  UploadFile(req, res, recivedFiles, (fn) => {
    res.render('uploaded')
  })
  logger.LogReq(req)
})

// -----------------------------------------------------------------------------------------------

app.get('/stuff*', function (req, res) {
  let curr = listedFiles + '/' + req.url.substring('/stuff/'.length, req.url.length).split('?')[0]
  let relPath = curr.substring('./public/files'.length, curr.length)

  if (relPath[relPath.length - 1] !== '/') { relPath += '/' }

  let t = relPath.split('/')
  let prevDir = ''
  for (let i = 0; i < t.length - 2; i++) { prevDir += t[i] + '/' }

  // curr = curr.replace(/\//g, "/");
  // relPath = relPath.replace(/\//g, "/");

  logger.LogReq(req)

  if (fs.lstatSync(curr).isDirectory()) {
    if (curr[curr.length - 1] !== '/') { curr += '/' }

    let f = []

    fs.readdirSync(curr).forEach((item) => {
      if (item[0] !== '.') {
        let res = { name: item }
        let stats = fs.statSync(curr + '/' + item)

        let fileSizeInBytes = stats['size']
        res.size = Math.round(fileSizeInBytes / 1000000)

        res.path = relPath
        if (res.path[res.path.length - 1] !== '/') { res.path += '/' }
        res.path += item

        res.mtime = stats['mtime'].toLocaleString()

        f.push(res)
      }
    })

    res.render('folders', {
      folders: f,
      dirname: relPath,
      prevDir
    })
  } else {
    let fileStream = fs.createReadStream(curr)
    fileStream.pipe(res)
  }
})

// -----------------------------------------------------------------------------------------------

app.get('*', function (req, res) {
  res.render('404')
  res.status(404)
  // utils.AppendToFile(logger.GetDateString() + ": " + "404 GET", logFile);
})

app.post('*', function (req, res) {
  res.status(404)
  // utils.AppendToFile(logger.GetDateString() + ": " + "404 POST", logFile);
})

var msg = ''
stat.Load()

const httpServer = http.createServer(app)
httpServer.listen(port)
msg += 'Server listening on port ' + port + ' (http)'

if (startHTTPS && certsLoaded) {
  const httpsServer = https.createServer(certs, app)
  httpsServer.listen(httpsPort)
  msg += ', and ' + httpsPort + ' (https)...'
} else {
  logger.Log('Cert files does not exists, starting http only!', logger.GetColor('redbg'))
}
logger.Log(msg, logger.GetColor('yellow'))
logger.Log('Node version: ' + process.version)