const fs = require('fs')
const {PassThrough} = require('stream')
const archiver = require('archiver')
const moment = require('moment')
const jwt = require('jsonwebtoken')
const {secretKey} = require('../authentication')
const {_sr} = require('../plugins/serverResponses')
const {
  appendS3UploadsToArchive,
  uploadBackupArchive,
  deleteOldBackups,
} = require('../plugins/backupStorage')
// models
const Category = require('../models/Category')
const Comment = require('../models/Comment')
const ContactUs = require('../models/ContactUs')
const Content = require('../models/Content')
const Gallery = require('../models/Gallery')
const HomePage = require('../models/HomePage')
const Links = require('../models/Links')
const Meeting = require('../models/Meeting')
const News = require('../models/News')
const NewsFile = require('../models/NewsFile')
const Occasion = require('../models/Occasion')
const Services = require('../models/Services')
const Slider = require('../models/Slider')
const User = require('../models/User')
const YearBanner = require('../models/YearBanner')

const hostFullError = '<h1 style="margin-top: 150px;text-align: center;direction: rtl;color: red;">فضای هاست پر میباشد.لطفا نسبت به پاک کردن بکاپ های قبلی یا افزایش فضای هاست اقدام فرمایید.</h1>'

module.exports.createBackUp = [
  // check user token and permission to backup
  async (req, res, next) => {
    const token = req.params.token
    if (!token) return res.status(401).json({message: 'unauthorized'})
    try {
      // check if token is not destroyed
      const user = await User.findOne({token: token})
      if (!user) return res.status(401).json({message: 'unauthorized'})

      // verify token
      const checkToken = await jwt.verify(user.token.replace(/^Bearer\s/, ''), secretKey)
      if (!checkToken) return res.status(401).json({message: 'unauthorized'})

      // check user permissions
      const permissions = user.permissions
      if (!permissions.includes('superAdmin')) res.status(401).json({message: 'unauthorized'})

      return next()

    } catch (e) {
      res.status(401).json({message: 'unauthorized'})
    }
  },
  // do backup :)
  async (req, res) => {
    try {
      console.log('backup started')

      const dataBaseQueries = [
        // categories
        Category.find(),
        // comments
        Comment.find(),
        // contact us
        ContactUs.find(),
        // content
        Content.find(),
        // gallery
        Gallery.find(),
        // home page
        HomePage.find(),
        // links
        Links.find(),
        // meetings
        Meeting.find(),
        // news
        News.find(),
        // newsFile
        NewsFile.find(),
        // services
        Services.find(),
        // sliders
        Slider.find(),
        // users
        User.find(),
        // year banner
        YearBanner.find(),
        // occasion
        Occasion.find()
      ]

      const [categories, comments, contactus, contents, galleries, homepage, links, meetings, news, newsFiles, services, sliders, users, yearBanner, occasion] = await Promise.all(dataBaseQueries)

      const dateStr = moment(Date.now()).format('YYYY-MM-DD')
      const backupName = `backup_${dateStr}.zip`
      const archive = archiver('zip', {
        zlib: {level: 9}
      })
      const output = new PassThrough()
      const chunks = []

      output.on('data', (chunk) => chunks.push(chunk))

      archive.on('warning', function (err) {
        if (err.code === 'ENOENT') {
          console.log('On archiver warning -- ENOENT error code', err)
        } else {
          console.log('On archiver warning -- other error codes ', err)
        }
        return res.status(500).send(hostFullError)
      })

      archive.on('error', function (err) {
        console.log(err)
        return res.status(500).json({message: 'مشکلی پیش آمده'})
      })

      archive.pipe(output)

      const databaseExports = [
        ['categories', categories],
        ['comments', comments],
        ['contactus', contactus],
        ['contents', contents],
        ['galleries', galleries],
        ['homepage', homepage],
        ['links', links],
        ['meetings', meetings],
        ['news', news],
        ['newsFiles', newsFiles],
        ['services', services],
        ['sliders', sliders],
        ['users', users],
        ['yearBanner', yearBanner],
        ['occasion', occasion],
      ]

      for (const [name, data] of databaseExports) {
        archive.append(JSON.stringify(data), {name: `database/${name}_${dateStr}.json`})
      }

      await appendS3UploadsToArchive(archive)

      await archive.finalize()

      await new Promise((resolve, reject) => {
        output.on('end', resolve)
        output.on('error', reject)
      })

      const buffer = Buffer.concat(chunks)

      await uploadBackupArchive(buffer, backupName)

      res.setHeader('Content-Type', 'application/zip')
      res.setHeader('Content-Disposition', `attachment; filename="${backupName}"`)
      return res.send(buffer)
    } catch (e) {
      return res.status(500).send(hostFullError)
    }
  }
]


module.exports.removeOldBackups = [
  async (req, res) => {
    try {
      await deleteOldBackups()

      if (fs.existsSync('./backup')) {
        const files = fs.readdirSync('./backup')
        for (const file of files) {
          const filePath = `./backup/${file}`
          const isDirectory = fs.statSync(filePath).isDirectory()
          if (isDirectory) fs.rmdirSync(filePath, {recursive: true})
          else fs.unlinkSync(filePath)
        }
      }

      return res.json({message: _sr['fa'].response.success_remove})
    } catch (e) {
      return res.status(500).json({message: e})
    }
  }
]