const fs = require('fs')
import * as config from 'config'
const ilog = require('ilog')
import * as mongoose from 'mongoose'

const dbUrl: string = config.MONGODB.URL

function getMongoConnectionOptions() {
  const options: mongoose.ConnectionOptions = {}
  if (config.MONGODB.USE_CERT) {
    (options as any).sslValidate = false
    options.ssl = true
    options.checkServerIdentity = false
    options.sslKey = fs.readFileSync(config.MONGODB.CLIENT_KEY_PATH)
    options.sslCert = fs.readFileSync(config.MONGODB.CLIENT_CRT_PATH)
    options.sslCA = [fs.readFileSync(config.MONGODB.CA_PATH)]
  }
  return options
}

const dbConn = mongoose.createConnection(dbUrl, getMongoConnectionOptions())

dbConn.on('error', (err) => {
  ilog.error(err)
  throw err
})

dbConn.on('reconnectFailed', () => {
  throw new Error('mongoose reconnect failed')
})

export default dbConn