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

 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/>.

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

// package requires
import express, { RequestHandler } from 'express'
import fileUpload from 'express-fileupload'
import type { Database } from 'better-sqlite3'
import http from 'http'
import https from 'https'

// other requires
import logger from '../../utils/logger'
import utils from '../../utils/utils'
import auth from '../../middlewares/auth.middleware'
import { SetupData } from '../../server'
import { ModuleType, Request, Submodule } from '../../types/basicTypes'

// files
const rootRedirectToFile = 'data/apiRootRedirectTo'

// other constants
const moduleName = 'API'

// stuff gotten from server.js
let userDB: Database
let url: string
let publicdirs: string[] = []
let httpServer: http.Server
let httpsServer: https.Server

function GetApp(): ModuleType {
  const app = express()

  const publicDir = publicdirs[0]
  if (!publicDir) {
    throw new Error(`No public dir! ( API )`)
  }

  let domain: any = url.split('.') // [ "https://api", "frylabs", "net" ]
  domain.shift() // [ "frylabs", "net" ]
  domain = domain.join('.') // "frylabs.net"
  logger.DebugLog(`Cookie domain: ${domain}`, 'cookie', 1)

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

  app.use(
    express.urlencoded({
      limit: '10mb',
      extended: true,
    }) as RequestHandler
  )
  app.use(
    express.json({
      limit: '10mb',
    }) as RequestHandler
  )
  app.set('view engine', 'ejs')
  app.set('views', ['./src/modules/api/views', './src/sharedViews'])
  app.use(
    auth({
      userDB: userDB,
      jsonResponse: true,
      exceptions: [
        '/register',
        '/favicon.ico',
        '/login',
        '/postfeedback',
        '/fosuploader',
        '/badtestsender',
      ],
    })
  )
  app.use(
    fileUpload({
      limits: { fileSize: 50 * 1024 * 1024 },
    })
  )
  // -------------------------------------------------------------------------------------------

  let rootRedirectURL = ''

  function reloadRootRedirectURL() {
    if (utils.FileExists(rootRedirectToFile)) {
      rootRedirectURL = utils.ReadFile(rootRedirectToFile)
    }
  }

  const filesToWatch = [
    {
      fname: rootRedirectToFile,
      logMsg: 'Root redirect URL changed',
      action: reloadRootRedirectURL,
    },
  ]

  function Load() {
    filesToWatch.forEach((ftw) => {
      if (utils.FileExists(ftw.fname)) {
        utils.WatchFile(ftw.fname, () => {
          logger.Log(ftw.logMsg)
          ftw.action()
        })
        ftw.action()
      } else {
        logger.Log(
          `File ${ftw.fname} does not exists to watch!`,
          logger.GetColor('redbg')
        )
      }
    })
  }

  Load()

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

  app.get('/', function (req: Request, res: any) {
    logger.LogReq(req)
    if (reloadRootRedirectURL) {
      res.redirect(rootRedirectURL)
    } else {
      res.json({ msg: 'hi c:' })
    }
  })

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

  const submoduleDatas = setupSubModules(app)

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

  publicdirs.forEach((pdir) => {
    logger.Log(`Using public dir: ${pdir}`)
    app.use(express.static(pdir))
  })

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

  app.get('*', function (_req: Request, res: any) {
    res.status(404).render('404')
  })

  app.post('*', function (_req: Request, res: any) {
    res.status(404).render('404')
  })

  function DailyAction() {
    submoduleDatas.forEach((data) => {
      if (data.dailyAction) {
        data.dailyAction()
      }
    })
  }

  submoduleDatas.forEach((data) => {
    if (data.load) {
      data.load()
    }
  })

  return {
    dailyAction: DailyAction,
    app: app,
  }
}

function setupSubModules(
  parentApp: express.Application,
  moduleSpecificData?: any
): Submodule[] {
  const submoduleDir = './submodules/'
  const absolutePath = __dirname + '/' + submoduleDir
  if (!utils.FileExists(absolutePath)) {
    return null
  }
  const files = utils.ReadDir(absolutePath)
  const moduleDatas: Submodule[] = []
  files.forEach((file) => {
    if (!file.endsWith('.js')) {
      return
    }
    const submodulePath = submoduleDir + file

    try {
      logger.Log(`Loading submodule '${file}' for '${moduleName}'...`)
      const mod = require(submodulePath).default // eslint-disable-line
      const loadedModData = mod.setup({
        app: parentApp,
        userDB: userDB,
        url: url,
        publicdirs: publicdirs,
        moduleSpecificData: moduleSpecificData,
        httpServer: httpServer,
        httpsServer: httpsServer,
      })
      moduleDatas.push(loadedModData || {})
    } catch (e) {
      logger.Log(`Error loading submodule from ${submodulePath}`)
      console.error(e)
    }
  })

  return moduleDatas
}

export default {
  name: moduleName,
  getApp: GetApp,
  setup: (data: SetupData): void => {
    userDB = data.userDB
    url = data.url
    publicdirs = data.publicdirs
    httpServer = data.httpServer
    httpsServer = data.httpsServer
  },
}