<html>
<title>Accept-CH test</title>
<body>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/open-and-add-load-event.js"></script>

<!--
Apart from this webpage, the test opens two more html web page. One test is run
in this web page, and two in the other web pages.
-->

<script>

// This test fetches resources/accept_ch.html. The response headers to
// that webpage contains only the Accept-CH header. These preferences should be
// stored so that the next request to the same origin is sent with the
// requested client hint headers.

// Next, to verify that the origin preferences were persisted by the user
// agent, this test fetches resources/expect_client_hints_headers.html in a new
// window. Fetching of resources/expect_client_hints_headers.html verifies that
// the user agent does send the client hints in the request headers.

// After this, the same is done but with a differet Accept-CH header, to test
// that the preferences change after receiving a different header.

// First, verify the initial state to make sure that the browser does not have
// client hints preferences cached from a previous run of the test.
promise_test(t => {
  return fetch("resources/echo-client-hints-received.py").then(r => {
    assert_equals(r.status, 200)
    // Verify that the browser did not include client hints in the request
    // headers when fetching echo_client_hints_received.py.
    assert_false(r.headers.has("device-memory-received"), "device-memory-received");
    assert_false(r.headers.has("viewport-width-received"), "viewport-width-received");
  });
}, "Precondition: Test that the browser does not have client hints preferences cached");

function acceptChLoaded() {
  // Open a new window. Verify that the user agent does attach the client hints.
  open_and_add_load_event("resources/expect-client-hints-headers.html", changeCh);
}

function changeCh() {
  // Use new window to overwrite client hint preferences, then verify new
  // settings have been saved
  open_and_add_load_event("resources/accept-ch-different.html", verifyChangeCh);
}

function verifyChangeCh() {
  // Use new window to overwrite client hint preferences, then verify new
  // settings have been saved
  open_and_add_load_event("resources/expect-client-hints-headers-different.html", clearCh);
}

function clearCh() {
  // Use new window to overwrite client hint preferences, then verify new
  // settings have been saved
  open_and_add_load_event("resources/accept-ch-empty.html", verifyClearCh);
}

function verifyClearCh() {
  // Use new window to overwrite client hint preferences, then verify new
  // settings have been saved
  open_and_add_load_event("resources/do-not-expect-client-hints.html", null);
}

// Fetching this webpage should cause user-agent to persist client hint
// preferences for the origin.
open_and_add_load_event("resources/accept-ch.html", acceptChLoaded);

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