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/*
 * @test
 * @bug 8166994
 * @summary Checks the subsequent call to parse the same language ranges
 *          which must generate the same list of language ranges
 *          i.e. the priority list containing equivalents, as in the
 *          first call
 * @run junit SubsequentRangeParsingTest
 */

import java.util.Arrays;
import java.util.List;
import java.util.Locale;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.Arguments;
import org.junit.jupiter.params.provider.MethodSource;

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

public class SubsequentRangeParsingTest {

    /*
     * Checks that consecutive calls to parse the same language ranges
     * generate the same list of language ranges.
     */
    @ParameterizedTest
    @MethodSource("ranges")
    public void parseConsistencyTest(List<String> list, String ranges) {
        // consecutive call to check the language range parse consistency
        testParseConsistency(list, ranges);
        testParseConsistency(list, ranges);
    }

    // Ensure that parsing the ranges returns the expected list.
    private static void testParseConsistency(List<String> list, String ranges) {
        List<String> priorityList = parseRanges(ranges);
        assertEquals(list, priorityList, "Failed to parse the language range:");
    }

    private static List<String> parseRanges(String s) {
        return Locale.LanguageRange.parse(s).stream()
                .map(Locale.LanguageRange::getRange)
                .collect(Collectors.toList());
    }

    // Ranges that have multiple equivalents and single equivalents.
    private static Stream<Arguments> ranges() {
        return Stream.of(
                Arguments.of(Arrays.asList("ccq-aa", "ybd-aa", "rki-aa"),
                        "ccq-aa"),
                Arguments.of(Arrays.asList("gfx-xz", "oun-xz", "mwj-xz",
                        "vaj-xz", "taj-xy", "tsf-xy"), "gfx-xz, taj-xy")
        );
    }
}