require('dotenv').config()
const { ApolloServer } = require('apollo-server-express')
const mongoose = require('mongoose')
const express = require('express')
const session = require('express-session')
const cors = require('cors')
const passport = require('passport')
const DiscordStrategy = require('passport-discord').Strategy
const User = require('./models/user')
const path = require('path')
const schema = require('./schema')

mongoose.set('useFindAndModify', false)
mongoose.set('useCreateIndex', true)

const callbackURL = process.env.NODE_ENV === 'development' ? 
  'http://localhost:3001/auth/discord/callback' :
  'https://www.sendou.ink/auth/discord/callback'

passport.use(new DiscordStrategy({
  clientID: process.env.CLIENT_ID,
  clientSecret: process.env.CLIENT_SECRET,
  callbackURL,
  scope: ['identify', 'connections']
},
function(accessToken, refreshToken, profile, cb) {
  const userToSave = {
    username: profile.username,
    discriminator: profile.discriminator,
    avatar: profile.avatar,
    discord_id: profile.id
  }
  for (var i = 0; i < profile.connections.length; i++) {
    const connection = profile.connections[i]
    if (connection.visibility === 1 && connection.verified) {
      if (connection.type === 'twitch') {
        userToSave.twitch_name = connection.name.toLowerCase()
      } else if (connection.type === 'twitter') {
        userToSave.twitter_name = connection.name.toLowerCase()
      }
    }
  }

  User.updateOne({discord_id: userToSave.discord_id}, userToSave, {upsert: true}, function(err, user) {
      return cb(err, userToSave)
  })
}))

passport.serializeUser(function(user, done) {
  done(null, user.discord_id)
})

passport.deserializeUser(function(discord_id, done) {
  User.findOne({discord_id}, function(err, user) {
    done(err, user)
  })
})

console.log('connecting to MongoDB')

mongoose.connect(process.env.MONGODB_URI, { useNewUrlParser: true, dbName: "production" })
  .then(() => {
    console.log('connected to MongoDB')
  })
  .catch((error) => {
    console.log('error connection to MongoDB:', error.message)
})

const server = new ApolloServer({ 
  schema,
  context: ({ req }) => {
    return { user: req.user }
  }
})

const app = express()

app.use(cors())

//https://stackoverflow.com/questions/8605720/how-to-force-ssl-https-in-express-js/31144924#31144924

function requireHTTPS(req, res, next) {
  // The 'x-forwarded-proto' check is for Heroku
  if (!req.secure && req.get('x-forwarded-proto') !== 'https' && process.env.NODE_ENV !== "development") {
    return res.redirect('https://' + req.get('host') + req.url)
  }
  next()
}

app.use(requireHTTPS)

//https://www.npmjs.com/package/express-session

let sess = {
  secret: process.env.SESSION_SECRET,
  resave: false,
  saveUninitialized: false,
  cookie: {}
}

if (process.env.NODE_ENV === 'production') {
  app.set('trust proxy', 1) 
  sess.cookie.secure = true 
}
 
app.use(session(sess))

app.use(express.static('build'))

app.use(passport.initialize())
app.use(passport.session())

server.applyMiddleware({ app })

app.get('/auth/discord', passport.authenticate('discord'))

app.get('/auth/discord/callback', passport.authenticate('discord', {
    failureRedirect: '/404'
}), function(req, res) {
    res.redirect('/u/' + req.user.discord_id) // Successful auth
})

app.get('/logout', function(req, res){
  req.logout()
  res.redirect('/')
})

app.get('*', (req, res) => {
  res.sendFile(path.resolve(__dirname, 'build', 'index.html'))
})

const PORT = process.env.PORT || 3001
app.listen({ port: PORT }, () => {
  console.log(`Server running on http://localhost:${PORT}${server.graphqlPath}`)
})