import EmberObject, { computed } from '@ember/object';
import Service from '@ember/service';
import { module, test } from 'qunit';
import { setupRenderingTest } from 'ember-qunit';
import hbs from 'htmlbars-inline-precompile';
import { find, render } from '@ember/test-helpers';
import { task } from 'ember-concurrency';
import sinon from 'sinon';
import { startMirage } from 'nomad-ui/initializers/ember-cli-mirage';
import { initialize as fragmentSerializerInitializer } from 'nomad-ui/initializers/fragment-serializer';

module('Integration | Component | primary metric', function(hooks) {
  setupRenderingTest(hooks);

  hooks.beforeEach(function() {
    fragmentSerializerInitializer(this.owner);
    this.store = this.owner.lookup('service:store');
    this.server = startMirage();
    this.server.create('namespace');
    this.server.create('node');

    const getTrackerSpy = (this.getTrackerSpy = sinon.spy());
    const trackerPollSpy = (this.trackerPollSpy = sinon.spy());
    const trackerSignalPauseSpy = (this.trackerSignalPauseSpy = sinon.spy());

    const MockTracker = EmberObject.extend({
      poll: task(function*() {
        yield trackerPollSpy();
      }),
      signalPause: task(function*() {
        yield trackerSignalPauseSpy();
      }),

      cpu: computed(() => []),
      memory: computed(() => []),
    });

    const mockStatsTrackersRegistry = Service.extend({
      getTracker(...args) {
        getTrackerSpy(...args);
        return MockTracker.create();
      },
    });

    this.owner.register('service:stats-trackers-registry', mockStatsTrackersRegistry);
    this.statsTrackersRegistry = this.owner.lookup('service:stats-trackers-registry');
  });

  hooks.afterEach(function() {
    this.server.shutdown();
  });

  const commonTemplate = hbs`
    {{primary-metric
      resource=resource
      metric=metric}}
  `;

  test('Contains a line chart, a percentage bar, a percentage figure, and an absolute usage figure', async function(assert) {
    let resource;
    const metric = 'cpu';

    await this.store.findAll('node');

    resource = this.store.peekAll('node').get('firstObject');
    this.setProperties({ resource, metric });

    await render(commonTemplate);

    assert.ok(find('[data-test-line-chart]'), 'Line chart');
    assert.ok(find('[data-test-percentage-bar]'), 'Percentage bar');
    assert.ok(find('[data-test-percentage]'), 'Percentage figure');
    assert.ok(find('[data-test-absolute-value]'), 'Absolute usage figure');
  });

  test('The CPU metric maps to is-info', async function(assert) {
    const metric = 'cpu';

    await this.store.findAll('node');

    const resource = this.store.peekAll('node').get('firstObject');
    this.setProperties({ resource, metric });

    await render(commonTemplate);

    assert.ok(
      find('[data-test-line-chart] .canvas').classList.contains('is-info'),
      'Info class for CPU metric'
    );
  });

  test('The Memory metric maps to is-danger', async function(assert) {
    const metric = 'memory';

    await this.store.findAll('node');

    const resource = this.store.peekAll('node').get('firstObject');
    this.setProperties({ resource, metric });

    await render(commonTemplate);

    assert.ok(
      find('[data-test-line-chart] .canvas').classList.contains('is-danger'),
      'Danger class for Memory metric'
    );
  });

  test('Gets the tracker from the tracker registry', async function(assert) {
    const metric = 'cpu';

    await this.store.findAll('node');

    const resource = this.store.peekAll('node').get('firstObject');
    this.setProperties({ resource, metric });

    await render(commonTemplate);

    assert.ok(
      this.getTrackerSpy.calledWith(resource),
      'Uses the tracker registry to get the tracker for the provided resource'
    );
  });

  test('Immediately polls the tracker', async function(assert) {
    const metric = 'cpu';

    await this.store.findAll('node');

    const resource = this.store.peekAll('node').get('firstObject');
    this.setProperties({ resource, metric });

    await render(commonTemplate);

    assert.ok(this.trackerPollSpy.calledOnce, 'The tracker is polled immediately');
  });

  test('A pause signal is sent to the tracker when the component is destroyed', async function(assert) {
    const metric = 'cpu';

    // Capture a reference to the spy before the component is destroyed
    const trackerSignalPauseSpy = this.trackerSignalPauseSpy;

    await this.store.findAll('node');

    const resource = this.store.peekAll('node').get('firstObject');
    this.setProperties({ resource, metric, showComponent: true });
    await render(hbs`
      {{#if showComponent}}
        {{primary-metric
          resource=resource
          metric=metric}}
        }}
      {{/if}}
    `);

    assert.notOk(trackerSignalPauseSpy.called, 'No pause signal has been sent yet');
    // This will toggle the if statement, resulting the primary-metric component being destroyed.
    this.set('showComponent', false);

    assert.ok(trackerSignalPauseSpy.calledOnce, 'A pause signal is sent to the tracker');
  });
});