/*****************************************************************************
 * Open MCT, Copyright (c) 2014-2024, United States Government
 * as represented by the Administrator of the National Aeronautics and Space
 * Administration. All rights reserved.
 *
 * Open MCT is licensed under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0.
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 * Open MCT includes source code licensed under additional open source
 * licenses. See the Open Source Licenses file (LICENSES.md) included with
 * this source code distribution or the Licensing information page available
 * at runtime from the About dialog for additional information.
 *****************************************************************************/
import { createOpenMct, resetApplicationState } from 'utils/testing';

import PerformancePlugin from './plugin.js';

describe('the plugin', () => {
  let openmct;
  let element;
  let child;

  let performanceIndicator;

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

    element = document.createElement('div');
    child = document.createElement('div');
    element.appendChild(child);

    openmct.install(new PerformancePlugin());

    openmct.on('start', done);

    performanceIndicator = openmct.indicators.indicatorObjects.find((indicator) => {
      return indicator.text && indicator.text() === '~ fps';
    });

    openmct.startHeadless();
  });

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

  it('installs the performance indicator', () => {
    expect(performanceIndicator).toBeDefined();
  });

  it('calculates an fps value', async () => {
    await loopForABit();
    // eslint-disable-next-line radix
    const fps = parseInt(performanceIndicator.text().split(' fps')[0]);
    expect(fps).toBeGreaterThan(0);
  });

  function loopForABit() {
    let frames = 0;

    return new Promise((resolve) => {
      requestAnimationFrame(function loop() {
        if (++frames > 90) {
          resolve();
        } else {
          requestAnimationFrame(loop);
        }
      });
    });
  }
});
