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/* eslint-env qunit */
import VideoTrackList from '../../../src/js/tracks/video-track-list.js';
import VideoTrack from '../../../src/js/tracks/video-track.js';
import EventTarget from '../../../src/js/event-target.js';
QUnit.module('Video Track List');
QUnit.test('trigger "change" when "selectedchange" is fired on a track', function(assert) {
const track = new EventTarget();
track.loaded_ = true;
const videoTrackList = new VideoTrackList([track]);
let changes = 0;
const changeHandler = function() {
changes++;
};
videoTrackList.on('change', changeHandler);
track.trigger('selectedchange');
assert.equal(changes, 1, 'one change events for trigger');
videoTrackList.off('change', changeHandler);
videoTrackList.onchange = changeHandler;
track.trigger('selectedchange');
assert.equal(changes, 2, 'one change events for another trigger');
videoTrackList.removeTrack(track);
videoTrackList.off('change');
});
QUnit.test('only one track is ever selected', function(assert) {
const track = new VideoTrack({selected: true});
const track2 = new VideoTrack({selected: true});
const track3 = new VideoTrack({selected: true});
const track4 = new VideoTrack();
const list = new VideoTrackList([track, track2]);
assert.equal(track.selected, false, 'track is unselected');
assert.equal(track2.selected, true, 'track2 is selected');
track.selected = true;
assert.equal(track.selected, true, 'track is selected');
assert.equal(track2.selected, false, 'track2 is unselected');
list.addTrack(track3);
assert.equal(track.selected, false, 'track is unselected');
assert.equal(track2.selected, false, 'track2 is unselected');
assert.equal(track3.selected, true, 'track3 is selected');
track2.selected = true;
assert.equal(track.selected, false, 'track is unselected');
assert.equal(track2.selected, true, 'track2 is selected');
assert.equal(track3.selected, false, 'track3 is unselected');
list.addTrack(track4);
assert.equal(track.selected, false, 'track is unselected');
assert.equal(track2.selected, true, 'track2 is selected');
assert.equal(track3.selected, false, 'track3 is unselected');
assert.equal(track4.selected, false, 'track4 is unselected');
list.removeTrack(track);
list.removeTrack(track2);
list.removeTrack(track3);
list.removeTrack(track4);
});
QUnit.test('all tracks can be unselected', function(assert) {
const track = new VideoTrack();
const track2 = new VideoTrack();
const list = new VideoTrackList([track, track2]);
assert.equal(track.selected, false, 'track is unselected');
assert.equal(track2.selected, false, 'track2 is unselected');
track.selected = true;
assert.equal(track.selected, true, 'track is selected');
assert.equal(track2.selected, false, 'track2 is unselected');
track.selected = false;
assert.equal(track.selected, false, 'track is unselected');
assert.equal(track2.selected, false, 'track2 is unselected');
list.removeTrack(track);
list.removeTrack(track2);
});
QUnit.test('trigger a change event per selected change', function(assert) {
const track = new VideoTrack({selected: true});
const track2 = new VideoTrack({selected: true});
const track3 = new VideoTrack({selected: true});
const track4 = new VideoTrack();
const list = new VideoTrackList([track, track2]);
let change = 0;
list.on('change', () => change++);
track.selected = true;
assert.equal(change, 1, 'one change triggered');
list.addTrack(track3);
assert.equal(change, 2, 'another change triggered by adding an selected track');
track.selected = true;
assert.equal(change, 3, 'another change trigger by changing selected');
track.selected = false;
assert.equal(change, 4, 'another change trigger by changing selected');
list.addTrack(track4);
assert.equal(change, 4, 'no change triggered by adding a unselected track');
list.removeTrack(track);
list.removeTrack(track2);
list.removeTrack(track3);
list.removeTrack(track4);
list.off('change');
});
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