const DataLoader = require('dataloader')

const { machineAction } = require('../../services/machines')

const machineLoader = require('../../../machine-loader')
const machineEventsByIdBatch =
  require('../../../postgresql_interface').machineEventsByIdBatch

const machineEventsLoader = new DataLoader(
  ids => {
    return machineEventsByIdBatch(ids)
  },
  { cache: false },
)

const resolvers = {
  Machine: {
    latestEvent: parent => machineEventsLoader.load(parent.deviceId),
  },
  Query: {
    machines: () => machineLoader.getMachineNames(),
    machine: (...[, { deviceId }]) => machineLoader.getMachine(deviceId),
    unpairedMachines: () => machineLoader.getUnpairedMachines(),
  },
  Mutation: {
    machineAction: (...[, { deviceId, action, cashUnits, newName }, context]) =>
      machineAction({ deviceId, action, cashUnits, newName }, context),
  },
}

module.exports = resolvers