import MSSQL from 'msnodesqlv8'
import { HttpError } from 'flaska'

export function initPool(core, config) {
  let pool = new MSSQL.Pool(config)

  core.log.info(config, 'MSSQL database setttings')

  pool.on('open', function() { 
    core.log.info('MSSQL connection open')
  })

  let waiting = false

  /*pool.on('error', function(error) {
    if (error.length) {
      let msg = 'Error in MSSQL pool\n => ' + error[0].message.trim()
      for (let i = 1; i < error.length; i++) {
        msg += '\n => ' + error[i].message.trim()
      }
      core.log.error(msg)
    } else {
      core.log.error('Error in MSSQL pool')
      core.log.error(error)
    }

    if (waiting) { return }
    core.log.warn('Attempting to connect again in 5 seconds')
    waiting = true
    setTimeout(function() {
      waiting = false
      console.log('opening')
      pool.open()
      console.log('done')
    }, 5000)
  })*/

  core.log.info('Attempting to connect to MSSQL server')
  pool.open()

  // const sp = pool.procedureMgr()

  return {
    safeCallProc: function(name, params, options) {
      return pool.promises.callProc(config.schema + '.' + name, params, options)
        .catch(function(err) {
          let message = err.message
          if (err.lineNumber && err.procName) {
            message = `Error at ${err.procName}:${err.lineNumber} => ${message}`
          }
          throw new HttpError(500, message)
        })
    },
    promises: pool.promises,
  }
}