<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>Mute screen capture, make sure page state updates correctly.</title>
    <script src="../../resources/testharness.js"></script>
    <script src="../../resources/testharnessreport.js"></script>
    <script>

    if (window.testRunner)
        testRunner.setUserMediaPermission(true);

    function callGetDisplayMedia(options)
    {
        let promise;
        window.internals.withUserGesture(() => {
            promise = navigator.mediaDevices.getDisplayMedia(options);
        });
        return promise;
    }

    async function waitForPageStateChange(numberOfTries, originalState)
    {
        return new Promise(async (resolve) => {
            while (numberOfTries) {
                if (internals.pageMediaState() != originalState) {
                    resolve(true);
                    return;
                }
                
                await new Promise(resolve => { setTimeout(resolve, 10) });
                --numberOfTries;
            }

            resolve(false);
        });
    }

    promise_test(async (test) => {
        await new Promise(async (resolve, reject) => {
            let stream = await callGetDisplayMedia({ video: true });
            let pageMediaState = internals.pageMediaState();

            assert_false(pageMediaState.includes('HasMutedDisplayCaptureDevice'), 'page state does not include HasMutedDisplayCaptureDevice');
            assert_false(pageMediaState.includes('HasMutedVideoCaptureDevice'), 'page state does not include HasMutedVideoCaptureDevice');
            assert_false(pageMediaState.includes('HasMutedAudioCaptureDevice'), 'page state does not include HasMutedAudioCaptureDevice');

            let track = stream.getVideoTracks()[0];
            track.onunmute = () => { assert_unreached("Got 'unmute' event unexpectedly!") };

            track.onmute = async (evt) => {

                if (!await waitForPageStateChange(10, pageMediaState))
                    assert_unreached(`Page state did not change from ${pageMediaState}`);

                track.onunmute = async (evt) => {
                    if (!await waitForPageStateChange(10, pageMediaState))
                        assert_unreached(`Page state did not change from ${pageMediaState}`);

                    pageMediaState = internals.pageMediaState();
                    assert_false(pageMediaState.includes('HasMutedDisplayCaptureDevice'), 'page state does not include HasMutedDisplayCaptureDevice');
                    assert_true(pageMediaState.includes('HasActiveDisplayCaptureDevice'), 'page state includes HasActiveDisplayCaptureDevice');
                    resolve()
                }

                pageMediaState = internals.pageMediaState();
                assert_true(pageMediaState.includes('HasMutedDisplayCaptureDevice'), 'page state includes HasMutedDisplayCaptureDevice');
                assert_false(pageMediaState.includes('HasActiveDisplayCaptureDevice'), 'page state does not include HasActiveDisplayCaptureDevice');
                internals.setMediaStreamTrackMuted(track, false)
            }

            pageMediaState = internals.pageMediaState();
            internals.setMediaStreamTrackMuted(track, true);

            setTimeout(() => reject("Muted state did not change in .5 second"), 500);
        });
    }, "Mute video track during screen capture");

    </script>
</head>
<body>
</body>
</html>