/*

 * Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * @test

 * @bug 4888843

 * @summary verify that surrogate pairs representing codepoints with R or AL directionality

 * and correctly recognized and reordered.

 */

import java.text.Bidi;

public class BidiSurrogateTest {

    private static final String RTLS = new String(Character.toChars(0x10800)); // surrogate code point with R directionality

    private static final String LTRS = new String(Character.toChars(0x107ff)); // surrogate code point with L directionality

    private static final String LRE = "\u202a";

    private static final String RLE = "\u202b";

    private static final String PDF = "\u202c";

    public static void main(String[] args) {

        new BidiSurrogateTest().test();

    }

    void test() {

        test0();

        test1();

    }

    void test0() {

        // test unpaired surrogates - should have L directionality

        testRequiresBidi("\ud800", false);           // unpaired lead surrogate

        testRequiresBidi("\udc00", false);           // unpaired trail surrogate

        testRequiresBidi("\udc00\ud800", false);     // out of order surrogates

        testRequiresBidi("a\udc00b\ud800c", false);  // out of order surrogates split

        testRequiresBidi(LTRS, false);               // supplementary with L

        testRequiresBidi(RTLS, true);                // supplementary with R

        testRequiresBidi("a" + RTLS + "b", true);    // R supplementary in LTR text

        testRequiresBidi(LTRS + RTLS, true);         // R supplementary in LTR supplementary text

        testRequiresBidi(LRE, false);                // LRE lone embedding

        testRequiresBidi(RLE, true);                 // RLE lone embedding

        testRequiresBidi(PDF, false);                // PDF lone pop embedding

    }

    void testRequiresBidi(String string, boolean requiresBidi) {

        char[] text = string.toCharArray();

        if (Bidi.requiresBidi(text, 0, text.length) != requiresBidi) {

            throw new RuntimeException("testRequiresBidi failed with '" + string + "', " + requiresBidi);

        }

    }

    void test1() {

        // test that strings with surrogate runs process surrogate directionality ok

        testBidi("This is a string with " + LTRS + " in it.", false);

        testBidi("This is a string with \ud800 in it.", false);

        testBidi("This is a string with \u0640 in it.", 22, 1);

        testBidi(RTLS, true);

        testBidi("This is a string with " + RTLS + RTLS + RTLS + " in it.", 22, 6);

    }

    void testBidi(String string, boolean directionIsRTL) {

        Bidi bidi = new Bidi(string, Bidi.DIRECTION_DEFAULT_LEFT_TO_RIGHT);

        if (bidi.isMixed()) {

            throw new RuntimeException("bidi is mixed");

        }

        if (bidi.isRightToLeft() != directionIsRTL) {

            throw new RuntimeException("bidi is not " + (directionIsRTL ? "rtl" : "ltr"));

        }

    }

    void testBidi(String string, int rtlstart, int rtllength) {

        Bidi bidi = new Bidi(string, Bidi.DIRECTION_DEFAULT_LEFT_TO_RIGHT);

        for (int i = 0; i < bidi.getRunCount(); ++i) {

            if ((bidi.getRunLevel(i) & 1) != 0) {

                if (bidi.getRunStart(i) != rtlstart ||

                    bidi.getRunLimit(i) != rtlstart + rtllength) {

                    throw new RuntimeException("first rtl run didn't match " + rtlstart + ", " + rtllength);

                }

                break;

            }

        }

    }

}