const machineLoader = require('../../machine-loader')
const { UserInputError } = require('../graphql/errors')

function getMachine(machineId) {
  return machineLoader
    .getMachines()
    .then(machines => machines.find(({ deviceId }) => deviceId === machineId))
}

function machineAction({ deviceId, action, cashUnits, newName }, context) {
  const operatorId = context.res.locals.operatorId
  return getMachine(deviceId)
    .then(machine => {
      if (!machine)
        throw new UserInputError(`machine:${deviceId} not found`, { deviceId })
      return machine
    })
    .then(
      machineLoader.setMachine(
        { deviceId, action, cashUnits, newName },
        operatorId,
      ),
    )
    .then(getMachine(deviceId))
}

module.exports = { machineAction }
