import express from 'express'

import { ensureLogin } from '../../scripts/ensureLogin'
import wrap from '../../scripts/asyncRoute'
import * as API from '../api/admin'
import { sendMail } from '../api/emailer'
import { User, Login } from '../api'

const router = express.Router()
const apiRouter = express.Router()

// Check for privilege required to access the admin panel
router.use(ensureLogin, wrap(async (req, res, next) => {
  if (!req.session.privilege) {
    const u = await User.get(req.session.user)
    req.session.privilege = u.nw_privilege
  }

  if (req.session.user && req.session.privilege !== 5) {
    return res.redirect('/login')
  }

  res.locals.server_time = process.uptime()
  next()
}))

/* ================
 *   ASK PASSWORD
 * ================
 */

router.get('/access', (req, res) => {
  if (!req.session.accesstime || req.session.accesstime < Date.now()) {
    return res.status(401).jsonp({ error: 'Access expired' })
  }

  res.jsonp({ access: req.session.accesstime - Date.now() })
})

// Post password to continue
router.post('/', wrap(async (req, res, next) => {
  if (!req.body.password) return next()

  if (req.body.csrf !== req.session.csrf) {
    req.flash('message', { error: true, text: 'Invalid session token' })
    return next()
  }

  const passReady = await Login.password(req.session.user, req.body.password)
  if (passReady) {
    req.session.accesstime = Date.now() + 600000 // 10 minutes
    return res.redirect('/admin')
  } else {
    req.flash('message', { error: true, text: 'Invalid password' })
  }

  next()
}))

// Ensure that the admin panel is not kept open for prolonged time
router.use(wrap(async (req, res, next) => {
  if (req.session.accesstime) {
    if (req.session.accesstime > Date.now()) {
      req.session.accesstime = Date.now() + 600000
      return next()
    }

    delete req.session.accesstime
  }

  res.render('user/password', { post: '/admin' })
}))

/* =========
 *   VIEWS
 * =========
 */

router.get('/', (req, res) => {
  res.render('admin/index')
})

router.get('/oauth2', wrap(async (req, res) => {
  res.render('admin/oauth2')
}))

/* =======
 *   API
 * =======
 */

function csrfVerify (req, res, next) {
  if (req.body.csrf !== req.session.csrf) {
    return next(new Error('Invalid session'))
  }

  next()
}

/* =============
 *   User Data
 * =============
 */

apiRouter.get('/users', wrap(async (req, res) => {
  let page = parseInt(req.query.page)
  if (isNaN(page) || page < 1) {
    page = 1
  }

  const users = await API.getAllUsers(page, req.session.user.id)
  res.jsonp(users)
}))

apiRouter.get('/user/:id', wrap(async (req, res) => {
  const id = parseInt(req.params.id)
  if (isNaN(id)) {
    throw new Error('Invalid number')
  }

  res.jsonp(await API.getUser(id))
}))

apiRouter.post('/user', csrfVerify, wrap(async (req, res) => {
  const id = parseInt(req.body.user_id)
  if (isNaN(id)) {
    throw new Error('Invalid or missing user ID')
  }

  res.jsonp(await API.editUser(id, req.body))
}))

apiRouter.post('/user/resend_activation', csrfVerify, wrap(async (req, res) => {
  const id = parseInt(req.body.user_id)
  if (isNaN(id)) {
    throw new Error('Invalid or missing user ID')
  }

  res.jsonp(await API.resendActivationEmail(id))
}))

apiRouter.post('/user/revoke_totp', csrfVerify, wrap(async (req, res) => {
  const id = parseInt(req.body.user_id)
  if (isNaN(id)) {
    throw new Error('Invalid or missing user ID')
  }

  res.jsonp(await API.revokeTotpToken(id))
}))

apiRouter.post('/user/reset_password', csrfVerify, wrap(async (req, res) => {
  const id = parseInt(req.body.user_id)
  if (isNaN(id)) {
    throw new Error('Invalid or missing user ID')
  }

  res.jsonp(await API.sendPasswordEmail(id))
}))

apiRouter.post('/user/lock', csrfVerify, wrap(async (req, res) => {
  const id = parseInt(req.body.user_id)
  if (isNaN(id)) {
    throw new Error('Invalid or missing user ID')
  }

  res.jsonp(await API.lockAccount(id))
}))

const availableScopes = ['uuid', 'email', 'username', 'display_name']
apiRouter.get('/search/users', wrap(async (req, res) => {
  if (!req.query.terms) throw new Error('Please specify search terms!')

  const scopes = []
  if (req.query.scopes) {
    const scq = req.query.scopes.split(',')

    for (const i in scq) {
      scq[i] = scq[i].trim()

      if (availableScopes.indexOf(scq[i]) !== -1) {
        scopes.push(scq[i])
      }
    }
  }

  if (!scopes.length) {
    scopes.push('email')
  }

  const results = await API.searchUsers(req.query.terms, scopes)
  res.jsonp(results)
}))

/* ===============
 *   OAuth2 Data
 * ===============
 */

apiRouter.get('/clients', wrap(async (req, res) => {
  let page = parseInt(req.query.page)
  if (isNaN(page) || page < 1) {
    page = 1
  }

  const clients = await API.getAllClients(page)
  res.jsonp(clients)
}))

apiRouter.get('/client/:id', wrap(async (req, res) => {
  const id = parseInt(req.params.id)
  if (isNaN(id)) {
    throw new Error('Invalid number')
  }

  const client = await API.getClient(id)

  res.jsonp(client)
}))

apiRouter.post('/client/new', csrfVerify, wrap(async (req, res) => {
  await API.createClient(req.body, req.session.user)

  res.status(204).end()
}))

apiRouter.post('/client/update', csrfVerify, wrap(async (req, res) => {
  const id = parseInt(req.body.id)

  if (!id || isNaN(id)) throw new Error('ID missing')

  await API.updateClient(id, req.body)

  res.status(204).end()
}))

apiRouter.post('/client/new_secret', csrfVerify, wrap(async (req, res) => {
  const id = parseInt(req.body.id)
  if (isNaN(id)) {
    throw new Error('Invalid client ID')
  }

  const client = await API.newSecret(id)

  res.jsonp(client)
}))

apiRouter.post('/client/delete', csrfVerify, wrap(async (req, res) => {
  const id = parseInt(req.body.id)
  if (isNaN(id)) {
    throw new Error('Invalid client ID')
  }

  const client = await API.removeClient(id)

  res.jsonp(client)
}))

/* ========
 *   Bans
 * ========
 */

apiRouter.get('/bans', wrap(async (req, res) => {
  let page = parseInt(req.query.page)
  if (isNaN(page) || page < 1) {
    page = 1
  }

  const bans = await API.getAllBans(page)
  res.jsonp(bans)
}))

apiRouter.post('/ban/pardon', csrfVerify, wrap(async (req, res) => {
  const id = parseInt(req.body.id)
  if (isNaN(id)) {
    throw new Error('Invalid number')
  }

  const ban = await API.removeBan(id)

  res.jsonp(ban)
}))

apiRouter.post('/ban', csrfVerify, wrap(async (req, res) => {
  if (!req.body.user_id) throw new Error('ID missing')

  const result = await API.addBan(req.body, req.session.user.id)

  res.jsonp(result)
}))

apiRouter.post('/email', csrfVerify, wrap(async (req, res) => {
  if (!req.body.email) throw new Error('Email missing')
  if (!req.body.title) throw new Error('Title missing')
  if (!req.body.content) throw new Error('Content missing')

  var message = {
    subject: req.body.title,
    html: req.body.content
  }

  const result = await sendMail(req.body.email, message)

  res.jsonp(result)
}))

apiRouter.use((err, req, res, next) => {
  console.error(err)
  return res.status(400).jsonp({ error: err.message })
})

router.use('/api', apiRouter)

export default router