<!DOCTYPE html>
<html>
<body>
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<script>

test(function() {
    assert_true('language' in window.navigator);
    assert_true('languages' in window.navigator);
    assert_true(Array.isArray(window.navigator.languages));
    assert_true(Object.isFrozen(window.navigator.languages));
    assert_true('onlanguagechange' in window);
}, "Test that NavigatorLanguage API is present in window");

test(function() {
    var received = false;
    window.onlanguagechange = function() {
      received = true;
    }

    testRunner.setAcceptLanguages('klingon');
    assert_true(received);
}, "Test that the languagechange event fires on window.onlanguagechange");

test(function() {
    var received = false;
    window.addEventListener('languagechange', function() {
        received = true;
    });

    testRunner.setAcceptLanguages('klingon-FR');
    assert_true(received);
}, "Test that the languagechange event fires on window.addEventListener('languagechange')");

test(function() {
    window.received = false; // We need a global variable here.
    document.body.setAttribute('onlanguagechange', 'window.received = true;');

    testRunner.setAcceptLanguages('klingon-US');
    assert_true(window.received);
}, "Test that the languagechange event fires on body onlanguagechange attribute");

test(function() {
    window.received = 0; // We need a global variable here.
    var fromWindowHandler = false;
    document.body.setAttribute('onlanguagechange', 'window.received++;');
    window.onlanguagechange = function() {
        received++;
        fromWindowHandler = true;
    }

    testRunner.setAcceptLanguages('klingon');
    assert_equals(window.received, 1);
    assert_true(fromWindowHandler);

    window.received = 0;
    fromWindowHandler = false;
    window.onlanguagechange = function() {
        received++;
        fromWindowHandler = true;
    }
    document.body.setAttribute('onlanguagechange', 'window.received++;');

    testRunner.setAcceptLanguages('klingon-FR');
    assert_equals(window.received, 1);
    assert_false(fromWindowHandler);
}, "Test that the languagechange event fires on body onlanguagechange attribute XOR window.onlanguagechange");

test(function() {
    var eventsCount = 0;
    window.onlanguagechange = function() {
        eventsCount++;
    }

    testRunner.setAcceptLanguages('klingon-US');
    testRunner.setAcceptLanguages('klingon-US');

    assert_equals(eventsCount, 1);
}, "Test that changing the language to the same value doesn't fire an event.")

test(function() {
    window.addEventListener('languagechange', function(e) {
        assert_false(e.cancelable);
        assert_false(e.bubbles);
    });

    testRunner.setAcceptLanguages('klingon');
}, "Test properties of the fired event.");

test(function() {
    var testValues = [
        { accept_languages: 'foo', languages: ['foo'] },
        { accept_languages: '', languages: ['en-US'] },
        { accept_languages: 'foo,bar', languages: [ 'foo', 'bar' ] },
        { accept_languages: '  foo , bar ', languages: [ 'foo', 'bar' ] },
        { accept_languages: '  foo ; bar ', languages: [ 'foo ; bar' ] },
        { accept_languages: '_foo_', languages: ['_foo_'] },
        { accept_languages: 'en_', languages: ['en-'] },
        { accept_languages: 'en__', languages: ['en-_'] },
        { accept_languages: 'en_US, fr_FR', languages: ['en-US', 'fr-FR'] },
        { accept_languages: 'en_US_CA', languages: ['en-US_CA'] },
    ];

    var eventsCount = 0;
    window.onlanguagechange = function() {
        eventsCount++;
    }

    for (var i = 0; i < testValues.length; ++i) {
        var data = testValues[i];

        testRunner.setAcceptLanguages(data.accept_languages);
        assert_equals(eventsCount, i + 1);

        assert_equals(navigator.languages.length, data.languages.length);
        assert_equals(navigator.language, data.languages[0]);
        for (var j = 0; j < navigator.languages.length; ++j) {
            assert_equals(navigator.languages[j], data.languages[j]);
        }
    }
}, "Test that navigator.languages reflects the accept languages value.");

test(function() {
    var previous = navigator.languages;
    assert_equals(navigator.languages, navigator.languages);
    assert_equals(navigator.languages, previous);

    testRunner.setAcceptLanguages('fr-FR');
    assert_not_equals(navigator.languages, previous);
}, "Test navigator.languages' caching behaviour.");

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