'use strict'

/* IMPORTS */
const express = require('express')
const bodyParser = require('body-parser')
const expressValidator = require('express-validator')
const cookieParser = require('cookie-parser')
const cookieSession = require('cookie-session')
const debug = require('debug')('tracman-server')
const mongoose = require('mongoose')
const nunjucks = require('nunjucks')
const passport = require('passport')
const flash = require('connect-flash-plus')
const env = require('./config/env/env.js')
const User = require('./config/models.js').user
const mail = require('./config/mail.js')
const demo = require('./config/demo.js')
const app = express()
const http = require('http').Server(app)
const io = require('socket.io')(http)
const sockets = require('./config/sockets.js')

/* SETUP */
/* Database */ {
  // Setup with native ES6 promises
  mongoose.Promise = global.Promise

  // Connect to database
  mongoose.connect(env.mongoSetup, {
    server: {socketOptions: {
      keepAlive: 1, connectTimeoutMS: 30000 }},
    replset: {socketOptions: {
      keepAlive: 1, connectTimeoutMS: 30000 }}
  })
  .then(() => { console.log(`💿 Mongoose connected to mongoDB`) })
  .catch((err) => { console.error(`❌ ${err.stack}`) })
}

/* Templates */ {
  nunjucks.configure(__dirname + '/views', {
    autoescape: true,
    express: app
  })
  app.set('view engine', 'html')
}

/* Session */ {
  app.use(cookieParser(env.cookie))
  app.use(cookieSession({
    cookie: {maxAge: 60000},
    secret: env.session,
    saveUninitialized: true,
    resave: true
  }))
  app.use(bodyParser.json())
  app.use(bodyParser.urlencoded({
    extended: true
  }))
  app.use(expressValidator())
  app.use(flash())
}

/* Auth */ {
  require('./config/passport.js')(passport)
  app.use(passport.initialize())
  app.use(passport.session())
}

/* Routes  */ {
  // Static files (keep this before default locals)
  app.use('/static', express.static(__dirname + '/static', {dotfiles: 'allow'}))

  // Default locals available to all views (keep this after static files)
  app.get('*', (req, res, next) => {
    // Path for redirects
    let nextPath = ((req.query.next) ? req.query.next : req.path.substring(0, req.path.indexOf('#')) || req.path)
    if (nextPath.substring(0, 6) !== '/login' && nextPath.substring(0, 7) !== 'signup' && nextPath.substring(0, 7) !== '/logout' && nextPath.substring(0, 7) !== '/static' && nextPath.substring(0, 6) !== '/admin') {
      req.session.next = nextPath + '#'
      debug(`Set redirect path to ${nextPath}#`)
    }

    // User account
    res.locals.user = req.user

    // Flash messages
    res.locals.successes = req.flash('success')
    res.locals.dangers = req.flash('danger')
    res.locals.warnings = req.flash('warning')

    next()
  })

  // Auth routes
  require('./config/routes/auth.js')(app, passport)

  // Main routes
  app.use('/', require('./config/routes/index.js'))

  // Contact form
  app.use('/contact', require('./config/routes/contact.js'))

  // Settings
  app.use('/settings', require('./config/routes/settings.js'))

  // Map
  app.use(['/map', '/trac'], require('./config/routes/map.js'))

  // Site administration
  app.use('/admin', require('./config/routes/admin.js'))

  // Testing
  if (env.mode == 'development') {
    app.use('/test', require('./config/routes/test.js'))
  }
} {
  // Catch-all for 404s
  app.use((req, res, next) => {
    if (!res.headersSent) {
      var err = new Error(`Not found: ${req.url}`)
      err.status = 404
      next(err)
    }
  })

  // Production handlers
  if (env.mode !== 'development') {
    app.use((err, req, res, next) => {
      if (err.status !== 404 && err.status !== 401) { console.error(`❌ ${err.stack}`) }
      if (res.headersSent) { return next(err) }
      res.status(err.status || 500)
      res.render('error', {
        code: err.status || 500,
        message: (err.status <= 499) ? err.message : 'Server error'
      })
    })

  // Development handlers
  } else {
    app.use((err, req, res, next) => {
      if (err.status !== 404) { console.error(`❌ ${err.stack}`) }
      if (res.headersSent) { return next(err) }
      res.status(err.status || 500)
      res.render('error', {
        code: err.status || 500,
        message: err.message,
        stack: err.stack
      })
    })
  }
}

/* Sockets */ {
  sockets.init(io)
}

/* RUNTIME */
console.log('🖥  Starting Tracman server...')

// Test SMTP server
mail.verify()

// Listen
http.listen(env.port, () => {
  console.log(`🌐 Listening in ${env.mode} mode on port ${env.port}... `)

  // Check for clients for each user
  User.find({})
  .then((users) => {
    users.forEach((user) => {
      sockets.checkForUsers(io, user.id)
    })
  })
  .catch((err) => {
    console.error(`❌ ${err.stack}`)
  })

  // Start transmitting demo
  demo(io)
})

module.exports = app