const express = require('express')
const app = express()
const morgan = require('morgan')
const bodyParser = require('body-parser')
const mongoClient = require('mongodb').MongoClient
const fs = require('fs-extra')

const session = require('./services/session/router')
const restapi = require('./services/restapi/router')
const media = require('./services/media/router')
const coreCfg = require('./services/core/config/router')

const CFG = require('./config')
const PKG = require('./package')
const auth = require('./services/session/auth')

const CTX = {
  cfg: CFG,
  logEnabled: true,
  dbHandler: null,
  db: null,
  tools: require('./tools/common'),
  models: {}
}

let server = {
  handler: null,
  interval: null,
  onReady: function () {}
}

app.use(morgan('tiny', {
  skip: function (req, res) { return !CTX.logEnabled }
}))
app.use(bodyParser.json())
app.use(require('./tools/middleware-done'))

mongoClient.connect(CFG.mongo.url, { useNewUrlParser: true }, function (pErr, pDbHandler) {
  if (pErr) {
    if (CTX.logEnabled) {
      console.error(`[!] Failed to connect DB: ${CFG.mongo.url}`)
      console.error(pErr)
    }
    process.exit(1)
  }
  // //////////////////////////////////////////////////////////////////////////
  // Init folder
  fs.ensureDirSync(CFG.media.documents)
  fs.ensureDirSync(CFG.media.cache)

  // //////////////////////////////////////////////////////////////////////////
  // DB HANDLING
  if (CTX.logEnabled) console.log(`[-] Connected to mongoDB: ${CFG.mongo.url}`)
  CTX.dbHandler = pDbHandler
  CTX.db = CTX.dbHandler.db(CFG.mongo.db)
  addUserIfRequired()
  // //////////////////////////////////////////////////////////////////////////
  // ROUTING

  app.use('/session', session(CTX))
  app.use('/doc', express.static('../doc/api'))
  app.get('/', (req, res) => {
    res.send(`Hello World from Earth server - v${PKG.version} - build ${CTX.tools.git.currentRevision}`)
  })
  // ALL API after auth call required authentification
  app.use(auth(CTX))
  app.use('/api', restapi(CTX))
  app.use('/media', media(CTX))
  app.use('/core/config', coreCfg(CTX))

  // //////////////////////////////////////////////////////////////////////////
  // LISTENING
  server.handler = app.listen(CFG.server.port, () => {
    if (CTX.logEnabled) console.log(`[-] Current build: ${CTX.tools.git.currentRevision}`)
    if (CTX.logEnabled) console.log(`[-] Earth server listening on: ${CFG.server.port}`)
    server.onReady()
  })
})

app.stop = function () {
  server.interval = setTimeout(function () {
    server.handler.close()
    CTX.db.handler.close()
  }, 500)
}

app.setOnReady = function (done) {
  clearTimeout(server.interval)
  server.onReady = done
  if (server.handler) {
    server.onReady()
  }
}

app.setLog = function (pFlag) {
  CTX.logEnabled = pFlag
}

module.exports = app

function addUserIfRequired () {
  let dbUsers = CTX.db.collection('users')
  dbUsers.find({}).count(function (pErr, pCount) {
    if (!pCount) {
      let user = {
        username: 'admin',
        email: 'admin@earth.com',
        details: {
          firstname: 'Admin', lastname: 'Admin', company: 'Earth', corporateTitle: 'BigBoss', language: 'en'
        },
        rights: {
          role: 'admin'
        },
        multipass: {
          hash: 'admin'
        }
      }
      dbUsers.insert(user, function () {})
    }
  })
}