const machineLoader = require('../machine-loader')
const { UserInputError } = require('apollo-server-express')

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

function machineAction({ deviceId, action }) {

    return getMachine(deviceId)
        .then(machine => {
            if (!machine) throw new UserInputError(`machine:${deviceId} not found`, { deviceId })
            return machine
        })
        .then(machineLoader.setMachine({ deviceId, action }))
        .then(getMachine(deviceId))
}

module.exports = { machineAction }