// The << Software identified by reference to the Ecma Standard* ("Software)">>  is protected by copyright and is being
// made available under the  "BSD License", included below. This Software may be subject to third party rights (rights
// from parties other than Ecma International), including patent rights, and no licenses under such third party rights
// are granted under this license even if the third party concerned is a member of Ecma International.  SEE THE ECMA
// CODE OF CONDUCT IN PATENT MATTERS AVAILABLE AT http://www.ecma-international.org/memento/codeofconduct.htm FOR
// INFORMATION REGARDING THE LICENSING OF PATENT CLAIMS THAT ARE REQUIRED TO IMPLEMENT ECMA INTERNATIONAL STANDARDS*.
//
// Copyright (C) 2012-2013 Ecma International
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// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
// following conditions are met:
// 1.   Redistributions of source code must retain the above copyright notice, this list of conditions and the following
//      disclaimer.
// 2.   Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
//      following disclaimer in the documentation and/or other materials provided with the distribution.
// 3.   Neither the name of the authors nor Ecma International may be used to endorse or promote products derived from
//      this software without specific prior written permission.
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// * Ecma International Standards hereafter means Ecma International Standards as well as Ecma Technical Reports

function shouldBe(actual, expected) {
    if (actual !== expected)
        throw new Error('bad value: ' + actual);
}

function* zip(a, b) {
    shouldBe(a.length, b.length);
    for (let i = 0; i < a.length; ++i) {
        yield [i, a[i], b[i]];
    }
}

function compare(actual, expected) {
    for (const [i, actualEntry, expectedEntry] of zip(actual, expected)) {
        shouldBe(actualEntry.type, expectedEntry.type);
        shouldBe(actualEntry.value, expectedEntry.value);
    }
}

if ($vm.icuHeaderVersion() >= 64) {
    {
        const date = new Date(2019, 7, 10,  1, 2, 3, 234);

        let dtf = new Intl.DateTimeFormat("en", { year: "numeric", month: "short", day: "numeric" });
        compare(dtf.formatRangeToParts(date, date), dtf.formatToParts(date));

        dtf = new Intl.DateTimeFormat("en", { minute: "numeric", second: "numeric" });
        compare(dtf.formatRangeToParts(date, date), dtf.formatToParts(date));

        dtf = new Intl.DateTimeFormat("en", { month: "short", day: "numeric", minute: "numeric" });
        compare(dtf.formatRangeToParts(date, date), dtf.formatToParts(date));

        dtf = new Intl.DateTimeFormat("en", { dateStyle: "long", timeStyle: "short" });
        compare(dtf.formatRangeToParts(date, date), dtf.formatToParts(date));
    }
    {
        // date1 and date2 are practically equal since the following formats do not show milliseconds.
        const date1 = new Date(2019, 7, 10,  1, 2, 3, 234);
        const date2 = new Date(2019, 7, 10,  1, 2, 3, 235);

        let dtf = new Intl.DateTimeFormat("en", { year: "numeric", month: "short", day: "numeric" });
        compare(dtf.formatRangeToParts(date1, date2), dtf.formatToParts(date1));

        dtf = new Intl.DateTimeFormat("en", { minute: "numeric", second: "numeric" });
        compare(dtf.formatRangeToParts(date1, date2), dtf.formatToParts(date1));

        dtf = new Intl.DateTimeFormat("en", { month: "short", day: "numeric", minute: "numeric" });
        compare(dtf.formatRangeToParts(date1, date2), dtf.formatToParts(date1));

        dtf = new Intl.DateTimeFormat("en", { dateStyle: "long", timeStyle: "short" });
        compare(dtf.formatRangeToParts(date1, date2), dtf.formatToParts(date1));
    }
}