@trusthab/composable-resources/src/resources/kpi/devices_low_battery.js

migrating https://github.com/knetikmedia/hab-api/tree/integration/app/resources/composable

const composer = require('../../mixin_loader');

module.exports = (App) => {
  const { underscore } = require('inflected');
  const LOW_BATTERY_THRESHOLD = 15;

  class DevicesLowBatteryResource {
    static mixins() {
      return ['Kpi'];
    }

    getMetricId() {
      return `devices_low_battery`;
    }

    getMetricType() {
      return 'gauge';
    }

    getValue() {
      const { value } = this.get('diff');

      if (value < LOW_BATTERY_THRESHOLD) { return 1; }

      return 0;
    }
  }

  return composer(DevicesLowBatteryResource, App);
};