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/*
 * @test
 * @bug 4700857 6997928 7079486
 * @summary tests for Locale.getDefault(Locale.Category) and
 * Locale.setDefault(Locale.Category, Locale)
 * @library /java/text/testlib
 * @build TestUtils LocaleCategory
 * @comment test user.xxx.display user.xxx.format properties
 * @run main/othervm -Duser.language.display=ja
 *                   -Duser.language.format=zh LocaleCategory
 * @comment test user.xxx properties overriding user.xxx.display/format
 * @run main/othervm -Duser.language=en
 *                   -Duser.language.display=ja
 *                   -Duser.language.format=zh LocaleCategory
 */

import java.util.Locale;

public class LocaleCategory {
    private static Locale base = null;
    private static Locale disp = null;
    private static Locale fmt = null;

    public static void main(String[] args) {
        Locale reservedLocale = Locale.getDefault();
        if (TestUtils.hasSpecialVariant(reservedLocale)) {
            System.out.println("Skipping this test because locale is " + reservedLocale);
            return;
        }

        try {
            Locale.Builder builder = new Locale.Builder();
            base = builder.setLanguage(System.getProperty("user.language", ""))
                  .setScript(System.getProperty("user.script", ""))
                  .setRegion(System.getProperty("user.country", ""))
                  .setVariant(System.getProperty("user.variant", "")).build();
            disp = builder.setLanguage(
                    System.getProperty("user.language.display",
                                Locale.getDefault().getLanguage()))
                        .setScript(System.getProperty("user.script.display",
                                Locale.getDefault().getScript()))
                        .setRegion(System.getProperty("user.country.display",
                                Locale.getDefault().getCountry()))
                        .setVariant(System.getProperty("user.variant.display",
                                Locale.getDefault().getVariant())).build();
            fmt = builder.setLanguage(System.getProperty("user.language.format",
                                Locale.getDefault().getLanguage()))
                       .setScript(System.getProperty("user.script.format",
                                Locale.getDefault().getScript()))
                       .setRegion(System.getProperty("user.country.format",
                                Locale.getDefault().getCountry()))
                       .setVariant(System.getProperty("user.variant.format",
                                  Locale.getDefault().getVariant())).build();
            checkDefault();
            testGetSetDefault();
            testBug7079486();
        } finally {
            // restore the reserved locale
            Locale.setDefault(reservedLocale);
        }
    }

    private static void checkDefault() {
        if (!base.equals(Locale.getDefault()) ||
            !disp.equals(Locale.getDefault(Locale.Category.DISPLAY)) ||
            !fmt.equals(Locale.getDefault(Locale.Category.FORMAT))) {
            throw new RuntimeException("Some of the return values from "
                    + "getDefault() do not agree with the locale derived "
                    + "from \"user.xxxx\" system properties");
        }
    }

    private static void testGetSetDefault() {
        try {
            Locale.setDefault(null, null);
            throw new RuntimeException("setDefault(null, null) should throw a "
                    + "NullPointerException");
        } catch (NullPointerException npe) {}

        Locale.setDefault(Locale.CHINA);
        if (!Locale.CHINA.equals(Locale.getDefault(Locale.Category.DISPLAY)) ||
            !Locale.CHINA.equals(Locale.getDefault(Locale.Category.FORMAT))) {
            throw new RuntimeException("setDefault() should set all default "
                    + "locales for all categories");
        }
    }

    private static void testBug7079486() {
        Locale zh_Hans_CN = Locale.forLanguageTag("zh-Hans-CN");

        // make sure JRE has zh_Hans_CN localized string
        if (zh_Hans_CN.getDisplayScript(Locale.US)
                .equals(zh_Hans_CN.getDisplayScript(zh_Hans_CN))) {
            return;
        }

        Locale.setDefault(Locale.US);
        String en_script = zh_Hans_CN.getDisplayScript();

        Locale.setDefault(Locale.Category.DISPLAY, zh_Hans_CN);
        String zh_script = zh_Hans_CN.getDisplayScript();

        if (en_script.equals(zh_script)) {
            throw new RuntimeException("Locale.getDisplayScript() (no args) "
                    + "does not honor default DISPLAY locale");
        }
    }
}