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/*
 * @test
 * @bug 8248434
 * @modules jdk.localedata
 * @summary Checks format/parse round trip in case-insensitive manner.
 * @run junit/othervm CaseInsensitiveParseTest
 */

import org.junit.jupiter.api.TestInstance;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.MethodSource;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Date;
import java.util.Locale;
import java.util.stream.Stream;

import static org.junit.jupiter.api.Assertions.assertEquals;

@TestInstance(TestInstance.Lifecycle.PER_CLASS)
public class CaseInsensitiveParseTest {

    private final static String PATTERN = "GGGG/yyyy/MMMM/dddd/hhhh/mmmm/ss/aaaa";
    private final static Date EPOCH = new Date(0L);

    Object[][] locales() {
        return (Object[][])Arrays.stream(DateFormat.getAvailableLocales())
            .map(Stream::of)
            .map(Stream::toArray)
            .toArray(Object[][]::new);
    }

    @ParameterizedTest
    @MethodSource("locales")
    void testUpperCase(Locale loc) throws ParseException {
        SimpleDateFormat sdf = new SimpleDateFormat(PATTERN, loc);
        String formatted = sdf.format(EPOCH);
        assertEquals(EPOCH, sdf.parse(formatted.toUpperCase(Locale.ROOT)),
                "roundtrip failed for string '" + formatted + "', locale: " + loc);
    }

    @ParameterizedTest
    @MethodSource("locales")
    void testLowerCase(Locale loc) throws ParseException {
        SimpleDateFormat sdf = new SimpleDateFormat(PATTERN, loc);
        String formatted = sdf.format(EPOCH);
        assertEquals(EPOCH, sdf.parse(formatted.toLowerCase(Locale.ROOT)),
                "roundtrip failed for string '" + formatted + "', locale: " + loc);
    }
}