import connectSession from 'connect-redis'
import redis from 'redis'
import session from 'express-session'
import favicon from 'serve-favicon'
import bodyParser from 'body-parser'
import express from 'express'
import crypto from 'crypto'
import path from 'path'

import routes from './routes'
import flash from '../scripts/flash'
import config from '../scripts/load-config'
import { init as initEmail } from './api/emailer'

const app = express()
const SessionStore = connectSession(session)

app.enable('trust proxy', 1)

app.use(bodyParser.urlencoded({ extended: false }))
app.use(bodyParser.json())

app.use(flash())

app.disable('x-powered-by')

app.use(session({
  key: config.server.session_key,
  secret: config.server.session_secret,
  store: new SessionStore({ client: redis.createClient(config.redis) }),
  resave: false,
  saveUninitialized: true,
  cookie: {
    secure: process.env.NODE_ENV !== 'development',
    maxAge: 2678400000 // 1 month
  }
}))

app.use((req, res, next) => {
  // Inject a cleaner version of the user's IP Address into the request
  let ipAddr = req.headers['x-forwarded-for'] || req.connection.remoteAddress

  if (ipAddr.indexOf('::ffff:') !== -1) {
    ipAddr = ipAddr.replace('::ffff:', '')
  }

  req.realIP = ipAddr

  // Make sure CSRF token is present in the session
  if (!req.session.csrf) {
    req.session.csrf = crypto.randomBytes(12).toString('hex')
  }

  // Add user and csrf token into rendering information
  res.locals = Object.assign(res.locals, {
    user: req.session.user || null,
    csrf: req.session.csrf
  })

  // Add Piwik tracker if configured
  if (config.matomo && config.matomo.site_id) {
    res.locals.matomo = config.matomo
  }

  next()
})

app.use(favicon(path.join(__dirname, '..', 'static', 'image', 'icynet.ico')))

module.exports = (args) => {
  app.set('view options', { layout: false })
  app.set('view engine', 'pug')
  app.set('views', path.join(__dirname, '../views'))

  if (args.dev) {
    console.warn('Worker is in development mode')

    // Dev logger
    const morgan = require('morgan')
    app.use(morgan('dev'))
  }

  const staticAge = args.dev ? 1000 : 7 * 24 * 60 * 60 * 1000 // 1 week of cache in production

  // Static content directories, cache these requests.
  // It is also a good idea to use nginx to serve these directories in order to save on computing power
  app.use('/style', express.static(path.join(__dirname, '../build/style'), { maxAge: staticAge }))
  app.use('/script', express.static(path.join(__dirname, '../build/script'), { maxAge: staticAge }))
  app.use('/static', express.static(path.join(__dirname, '../static'), { maxAge: staticAge }))
  app.use('/usercontent', express.static(path.join(__dirname, '../usercontent'), { maxAge: staticAge }))

  app.use(routes)

  app.listen(args.port, args.host, () => {
    console.log('Listening on %s:%s', args.host, args.port)

    // Initialize the email transporter (if configured)
    initEmail()
  })
}