import CustomStringFormatter from './CustomStringFormatter';
import { createOpenMct, resetApplicationState } from 'utils/testing';

const CUSTOM_FORMATS = [
  {
    key: 'sclk',
    format: (value) => 2 * value
  },
  {
    key: 'lts',
    format: (value) => 3 * value
  }
];

const valueMetadata = {
  key: 'sin',
  name: 'Sine',
  unit: 'Hz',
  formatString: '%0.2f',
  hints: {
    range: 1,
    priority: 3
  },
  source: 'sin'
};

const datum = {
  name: '1 Sine Wave Generator',
  utc: 1603930354000,
  yesterday: 1603843954000,
  sin: 0.587785209686822,
  cos: -0.8090170253297632
};

describe('CustomStringFormatter', function () {
  let element;
  let child;
  let openmct;
  let customStringFormatter;

  beforeEach((done) => {
    openmct = createOpenMct();

    element = document.createElement('div');
    child = document.createElement('div');
    element.appendChild(child);
    CUSTOM_FORMATS.forEach((formatter) => {
      openmct.telemetry.addFormat(formatter);
    });
    openmct.on('start', done);
    openmct.startHeadless();

    customStringFormatter = new CustomStringFormatter(openmct, valueMetadata);
  });

  afterEach(() => {
    return resetApplicationState(openmct);
  });

  it('adds custom format sclk', () => {
    const format = openmct.telemetry.getFormatter('sclk');
    expect(format.key).toEqual('sclk');
  });

  it('adds custom format lts', () => {
    const format = openmct.telemetry.getFormatter('lts');
    expect(format.key).toEqual('lts');
  });

  it('returns correct value for custom format sclk', () => {
    customStringFormatter.setFormat('&sclk');
    const value = customStringFormatter.format(datum, valueMetadata);
    expect(datum.sin * 2).toEqual(value);
  });

  it('returns correct value for custom format lts', () => {
    customStringFormatter.setFormat('&lts');
    const value = customStringFormatter.format(datum, valueMetadata);
    expect(datum.sin * 3).toEqual(value);
  });
});