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

 Question Server
 GitLab: <https://gitlab.com/MrFry/mrfrys-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/>.

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

let url = ''

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

const recivedFiles = 'public/recivedfiles'
const uloadFiles = 'public/f'
const dataFile = 'public/data.json'
const msgFile = 'stats/msgs'
const motdFile = 'public/motd'
const versionFile = 'public/version'
let donateURL = ''
try {
  donateURL = utils.ReadFile('./data/donateURL')
} catch (e) {
  logger.Log('Couldnt read donate URL file!', logger.GetColor('red'))
}

app.set('view engine', 'ejs')
app.set('views', [
  './modules/qmining/views',
  './sharedViews'
])
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'
}))

var data = actions.LoadJSON(dataFile)
var version = ''
var motd = ''

function LoadVersion () {
  version = utils.ReadFile(versionFile)
}

function LoadMOTD () {
  motd = utils.ReadFile(motdFile)
}

function Load () {
  utils.WatchFile(motdFile, (newData) => {
    logger.Log(`Motd changed: ${newData.replace(/\/n/g, '')}`)
    LoadMOTD()
  })
  utils.WatchFile(versionFile, (newData) => {
    logger.Log(`Version changed: ${newData.replace(/\/n/g, '')}`)
    LoadVersion()
  })

  LoadVersion()
  LoadMOTD()
}

Load()

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

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

  let motd = ''
  try {
    motd = utils.ReadFile(motdFile)
  } catch (e) {

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

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

app.get('/legacy', function (req, res) {
  let qcount = data.Subjects.reduce((acc, currItem) => {
    acc += currItem.length
    return acc
  }, 0)
  let scount = data.length

  let grouped = data.Subjects.reduce((res, s) => {
    let sName = s.getSubjNameWithoutYear()
    if (sName) {
      if (!res[sName]) {
        res[sName] = []
      }
      res[sName].push(s)
    } else {
      res.others.push(s)
    }
    return res
  }, {
    others: []
  })

  const ordered = {}
  Object.keys(grouped).sort().forEach((key) => {
    ordered[key] = grouped[key]
  })

  res.render('alldata', {
    data: data,
    orderedData: ordered,
    scount: scount,
    qcount: qcount,
    siteurl: url
  })

  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) {
  res.redirect('/')
})

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)
})

// all questions readable
app.get('/allqr.txt', function (req, res) {
  res.set('Content-Type', 'text/plain')
  res.send(data.toString())
  res.end()
  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('/install', function (req, res) {
  res.redirect(url + '/moodle-test-userscript/stable.user.js?install')
  res.end()
  logger.LogReq(req)
})

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

app.get('/thanks', function (req, res) {
  res.render('thanks', {
    siteurl: url
  })
  res.end()
  logger.LogReq(req)
})

app.get('/classesgit', function (req, res) {
  res.redirect('https://gitlab.com/MrFry/question-classes')
  res.end()
  logger.LogReq(req)
})

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

app.get('/servergit', function (req, res) {
  res.redirect('https://gitlab.com/MrFry/mrfrys-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)
})

// -------------------------------------------------------------------------------------------
// API

app.post('/isAdding', function (req, res) {
  logger.LogReq(req)

  // automatically saves to dataFile every n write
  let result = actions.ProcessIncomingRequest(
    req.body.datatoadd,
    data,
    { motd, version }
  )

  res.json({
    success: result !== -1,
    newQuestions: result
  })
})

app.get('/ask', function (req, res) {
  logger.LogReq(req)
  if (Object.keys(req.query).length === 0) {
    res.json({
      message: `ask something! ?q=[question]&subj=[subject]&data=[question data]. 'subj' is optimal for faster result`,
      result: [],
      recievedData: JSON.stringify(req.query),
      success: false
    })
  } else {
    if (req.query.q && req.query.data) {
      let subj = req.query.subj || ''
      let question
      try {
        question = decodeURIComponent(req.query.q)
      } catch (e) {
        console.err(req.query)
        throw e
      }
      let recData = {}
      try {
        recData = JSON.parse(req.query.data)
      } catch (e) {
        logger.Log(`Unable to parse recieved question data! '${req.query.data}'`, logger.GetColor('redbg'))
      }
      let r = data.Search(question, subj, recData)

      res.json({
        result: r,
        success: true
      })
    } else {
      res.json({
        message: `Invalid question :(`,
        result: [],
        recievedData: JSON.stringify(req.query),
        success: false
      })
    }
  }
})

function getSimplreRes () {
  return {
    subjects: data.length,
    questions: data.Subjects.reduce((acc, subj) => {
      return acc + subj.length
    }, 0)
  }
}
function getDetailedRes () {
  return data.Subjects.map((subj) => {
    return {
      name: subj.Name,
      count: subj.length
    }
  })
}

app.get('/datacount', function (req, res) {
  logger.LogReq(req)
  if (req.query.detailed === 'all') {
    res.json({
      detailed: getDetailedRes(),
      simple: getSimplreRes()
    })
  } else if (req.query.detailed) {
    res.json(getDetailedRes())
  } else {
    res.json(getSimplreRes())
  }
})

app.get('/infos', function (req, res) {
  let result = {}
  if (req.query.subjinfo) {
    result.subjinfo = getSimplreRes()
  }
  if (req.query.version) {
    result.version = version
  }
  if (req.query.motd) {
    result.motd = motd
  }
  res.json(result)
})

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

app.get('*', function (req, res) {
  res.status(404).render('404')
})

app.post('*', function (req, res) {
  res.status(404).render('404')
})

exports.app = app
exports.setup = (x) => {
  url = x.url
}

logger.Log('Qmining module started', logger.GetColor('yellow'))