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<html>
    <head>
        <script src="../../resources/js-test-pre.js"></script>
        <script src="resources/promise-utils.js"></script>
    </head>
    <body>
        <script>
            if (window.internals)
                internals.useMockRTCPeerConnectionFactory("");

            let stream;
            let midAssignedByA;
            let event;

            description("Test the case where an RTCRtpTransceiver gets a remotely assigned mid and also unmute the associated source");

            if (window.testRunner)
                testRunner.setUserMediaPermission(true);
            else {
                debug("This test can not be run without the testRunner");
                finishJSTest();
            }

            const pcA = new RTCPeerConnection({iceServers:[{urls:'stun:foo.com'}]});
            const pcB = new RTCPeerConnection({iceServers:[{urls:'stun:foo.com'}]});

            pcA.ontrack = function (evt) {
                testPassed("A: got remote track event");
            };

            pcB.ontrack = function (e) {
                event = e;

                testPassed("B: got remote track event");
                shouldBeType("event.track", "MediaStreamTrack");

                event.track.onunmute = function () {
                    testPassed("B: remote track unmute event");
                    finishJSTest();
                };
            };

            navigator.mediaDevices.getUserMedia({ "audio": true })
            .then(function (s) {
                stream = s;

                evalAndLog("pcA.addTrack(stream.getAudioTracks()[0], stream)");
                debug("A's transceiver is not yet associated with a media description and should have a null mid");
                shouldBeNull("pcA.getTransceivers()[0].mid");

                return pcA.createOffer();
            })
            .then(function (offer) {
                return pcA.setLocalDescription(offer);
            })
            .then(function () {
                debug("A: local offer set (mid gets defined)");

                evalAndLog("midAssignedByA = pcA.getTransceivers()[0].mid");
                shouldBeTrue("midAssignedByA !== null");

                evalAndLog("pcB.addTrack(stream.getAudioTracks()[0], stream)");
                debug("B's transceiver is not yet associated with a media description and should have a null mid");
                shouldBeNull("pcB.getTransceivers()[0].mid");

                return pcB.setRemoteDescription(pcA.localDescription);
            })
            .then(function () {
                debug("B: remote offer set (mid gets defined)");

                debug("B's transceiver should get its mid from the remote side (A)");
                shouldBe("pcB.getTransceivers()[0].mid", "midAssignedByA");

                return pcB.createAnswer();
            })
            .then(function (answer) {
                return pcB.setLocalDescription(answer);
            })
            .then(function () {
                return pcA.setRemoteDescription(pcB.localDescription);
            })
            .then(function () {
                testPassed("Offer/answer dialog completed")

                window.internals.emulateRTCPeerConnectionPlatformEvent(pcB, "unmute-remote-sources-by-mid");
            })
            .catch(function (error) {
                testFailed("Error in promise chain: " + error);
                finishJSTest();
            });

            window.jsTestIsAsync = true;
            window.successfullyParsed = true;

        </script>
        <script src="../../resources/js-test-post.js"></script>
    </body>
</html>