const Sequelize = require('sequelize')
const Umzug = require('umzug')
const path = require('path')
const config = require('../../config')
const log = require('../../log')

const db = {
  sequelize: null,
  close () {
    if (db.sequelize) {
      return db.sequelize.close()
    }
  },
  connect (dbConf = config.db) {
    log.debug(`Connecting to DB: ${JSON.stringify(dbConf)}`)
    db.sequelize = new Sequelize(dbConf)
    return db.sequelize.authenticate()
  },
  async isEmpty () {
    const users = await db.sequelize.query('SELECT * from users').catch(e => {})
    return !(users && users.length)
  },
  async runMigrations () {
    const logging = config.firstrun ? false : log.debug.bind(log)
    const umzug = new Umzug({
      storage: 'sequelize',
      storageOptions: { sequelize: db.sequelize },
      logging,
      migrations: {
        wrap: fun => {
          return () =>
            fun(db.sequelize.queryInterface, Sequelize).catch(e => {
              // log.error(e)
              return false
            })
        },
        path: path.resolve(__dirname, '..', '..', 'migrations')
      }
    })
    return await umzug.up()    
  }
}

if (!config.firstrun) {
  try {
    db.connect().then(e => {
      log.debug('Running migrations')
      db.runMigrations()
    })
  } catch (e) {
    log.warn(` ⚠️ Cannot connect to db, check your configuration => ${e}`)
    process.exit(1)
  }
}

module.exports = db