app.js

const express = require('express')
const errorhandler = require('errorhandler')
const mongoose = require('mongoose')
const logger = require('morgan')
const cors = require('cors')
require('dotenv').config()
const swaggerUi = require('swagger-ui-express')
const helmet = require('helmet')
const swaggerDocument = require('./swagger.json')

const isProduction = process.env.NODE_ENV === 'production'
const isTest = process.env.NODE_ENV === 'test'
const isDevelopment = process.env.NODE_ENV === 'development'

const app = express()

app.use(helmet())
app.use(cors())

app.use(logger('dev'))
app.use(express.json())
app.use(express.urlencoded({ extended: false }))
mongoose.set('useNewUrlParser', true)
mongoose.set('useCreateIndex', true)
mongoose.set('useUnifiedTopology', true)

if (!isProduction) {
  app.use(errorhandler())
}

if (isTest) {
  mongoose.connect(process.env.MONGODB_URI_TEST)
}

if (isProduction) {
  mongoose.connect(process.env.MONGODB_URI)
}

if (isDevelopment) {
  mongoose.connect(process.env.MONGODB_URI)
  mongoose.set('debug', true)
}

require('./models/User')
require('./models/Article')
require('./models/Comment')
require('./config/passport')

app.use(require('./routes'))
app.use('/', swaggerUi.serve, swaggerUi.setup(swaggerDocument))

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

/// error handlers

// development error handler
// will print stacktrace
if (!isProduction) {
  app.use(function (err, req, res, next) {
    console.log(err.stack)

    res.status(err.status || 500)

    res.json({
      errors: {
        message: err.message,
        error: err
      }
    })
  })
}

// production error handler
// no stacktraces leaked to user
app.use(function (err, req, res, next) {
  res.status(err.status || 500)
  res.json({
    errors: {
      message: err.message,
      error: {}
    }
  })
})

module.exports = app