<!DOCTYPE html>
<html>
<body>
<script src="../resources/js-test.js"></script>
<script>
description("Tests that media session interruption does not cause AudioContext.suspend() to throw");
jsTestIsAsync = true;

let didResolveSuspendPromise = false;

function didEndInterruption()
{
    testPassed("Did end interruption");
    context.onstatechange = null;
    // Interruption has ended but the script has called suspend() so we should move to "suspended"
    // state.
    shouldBeEqualToString("context.state", "suspended");
    shouldBeTrue("didResolveSuspendPromise");

    setTimeout(() => {
        shouldBeEqualToString("context.state", "suspended");

        context.resume().then(() => {
            testPassed("resume() promise was resolved");
            shouldBeEqualToString("context.state", "running");
            finishJSTest();
        }, (e) => {
            testFailed("context.resume() call after uninterrupted threw an unexpected exception: " + e);
            finishJSTest();
        });
    }, 10);
}

function didBeginInterruption()
{
    testPassed("Did begin interruption");
    context.onstatechange = null;
    shouldBeEqualToString("context.state", "interrupted");
    context.suspend().then(() => {
        testPassed("context.suspend() promise was resolved");
        didResolveSuspendPromise = true;
    }, (e) => {
        testFailed("context.suspend() call while interrupted threw an unexpected exception: " + e);
        finishJSTest();
    });

    shouldBeEqualToString("context.state", "interrupted");
    shouldBeFalse("didResolveSuspendPromise");
    setTimeout(() => {
        shouldBeEqualToString("context.state", "interrupted");
        shouldBeFalse("didResolveSuspendPromise");

        context.onstatechange = didEndInterruption;
        if (window.internals)
            evalAndLog("internals.endMediaSessionInterruption('mayresumeplaying')");
    }, 10);
}

function didStartRendering()
{
    testPassed("Did start rendering");
    context.onstatechange = didBeginInterruption;
    if (window.internals)
        evalAndLog("internals.beginMediaSessionInterruption('enteringbackground')");
}

let context = new AudioContext;
var source = context.createConstantSource();
source.connect(context.destination);

context.onstatechange = didStartRendering;
source.start();
</script>
</html>