'use strict'

// ----------- Node modules -----------
var bodyParser = require('body-parser')
var express = require('express')
var expressValidator = require('express-validator')
var http = require('http')
var morgan = require('morgan')
var path = require('path')
var TrackerServer = require('bittorrent-tracker').Server
var WebSocketServer = require('ws').Server

// Create our main app
var app = express()

// ----------- Checker -----------
var checker = require('./initializers/checker')

var miss = checker.checkConfig()
if (miss.length !== 0) {
  // Do not use logger module
  console.error('Miss some configurations keys.', { miss: miss })
  process.exit(0)
}

checker.createDirectoriesIfNotExist()

// ----------- PeerTube modules -----------
var config = require('config')
var constants = require('./initializers/constants')
var customValidators = require('./helpers/customValidators')
var database = require('./initializers/database')
var logger = require('./helpers/logger')
var peertubeCrypto = require('./helpers/peertubeCrypto')
var poolRequests = require('./lib/poolRequests')
var routes = require('./controllers')
var utils = require('./helpers/utils')
var videos = require('./lib/videos')
var webtorrent = require('./lib/webtorrent')

// Get configurations
var port = config.get('listen.port')

// ----------- Database -----------
database.connect()

// ----------- Command line -----------

// ----------- App -----------

// For the logger
app.use(morgan('combined', { stream: logger.stream }))
// For body requests
app.use(bodyParser.json())
app.use(bodyParser.urlencoded({ extended: false }))
// Validate some params for the API
app.use(expressValidator({
  customValidators: customValidators
}))

// ----------- Views, routes and static files -----------

// Livereload
app.use(require('connect-livereload')({
  port: 35729
}))

// Catch sefaults
require('segfault-handler').registerHandler()

// Static files
app.use(express.static(path.join(__dirname, '/public'), { maxAge: 0 }))

// Jade template from ./views directory
app.set('views', path.join(__dirname, '/views'))
app.set('view engine', 'jade')

// API routes
var api_route = '/api/' + constants.API_VERSION
app.use(api_route, routes.api)

// Views routes
app.use('/', routes.views)

// ----------- Tracker -----------

var trackerServer = new TrackerServer({
  http: false,
  udp: false,
  ws: false,
  dht: false
})

trackerServer.on('error', function (err) {
  logger.error(err)
})

trackerServer.on('warning', function (err) {
  logger.error(err)
})

var server = http.createServer(app)
var wss = new WebSocketServer({server: server, path: '/tracker/socket'})
wss.on('connection', function (ws) {
  trackerServer.onWebSocketConnection(ws)
})

// ----------- Errors -----------

// Catch 404 and forward to error handler
app.use(function (req, res, next) {
  var err = new Error('Not Found')
  err.status = 404
  next(err)
})

// Prod : no stacktraces leaked to user
if (process.env.NODE_ENV === 'production') {
  app.use(function (err, req, res, next) {
    logger.error(err)
    res.status(err.status || 500)
    res.render('error', {
      message: err.message,
      error: {}
    })
  })
} else {
  app.use(function (err, req, res, next) {
    logger.error(err)
    res.status(err.status || 500)
    res.render('error', {
      message: err.message,
      error: err
    })
  })
}

// ----------- Create the certificates if they don't already exist -----------
peertubeCrypto.createCertsIfNotExist(function (err) {
  if (err) throw err
  // Create/activate the webtorrent module
  webtorrent.create(function () {
    function cleanForExit () {
      utils.cleanForExit(webtorrent.app)
    }

    function exitGracefullyOnSignal () {
      process.exit()
    }

    process.on('exit', cleanForExit)
    process.on('SIGINT', exitGracefullyOnSignal)
    process.on('SIGTERM', exitGracefullyOnSignal)

    // ----------- Make the server listening -----------
    server.listen(port, function () {
      // Activate the pool requests
      poolRequests.activate()

      videos.seedAllExisting(function () {
        logger.info('Seeded all the videos')
        logger.info('Server listening on port %d', port)
        app.emit('ready')
      })
    })
  })
})

module.exports = app