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 * Copyright (c) 2018, 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.

 *

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 * questions.

 */

/*

 * @test

 * @bug 8214031

 * @summary Verify various corner cases with nested switch expressions.

 * @run main/othervm --enable-preview ExpressionSwitchBugsInGen

 */

public class ExpressionSwitchBugsInGen {

    public static void main(String... args) {

        new ExpressionSwitchBugsInGen().test(0, 0, 0, false);

        new ExpressionSwitchBugsInGen().test(0, 0, 1, true);

        new ExpressionSwitchBugsInGen().test(0, 1, 1, false);

        new ExpressionSwitchBugsInGen().test(1, 1, -1, true);

        new ExpressionSwitchBugsInGen().test(1, 12, -1, false);

        new ExpressionSwitchBugsInGen().testCommonSuperType(0, "a", new StringBuilder(), "a");

        new ExpressionSwitchBugsInGen().testCommonSuperType(1, "", new StringBuilder("a"), "a");

        new ExpressionSwitchBugsInGen().testSwitchExpressionInConditional(0, null, -1);

        new ExpressionSwitchBugsInGen().testSwitchExpressionInConditional(1, "", 0);

        new ExpressionSwitchBugsInGen().testSwitchExpressionInConditional(1, 1, 1);

        new ExpressionSwitchBugsInGen().testIntBoxing(0, 10, 10);

        new ExpressionSwitchBugsInGen().testIntBoxing(1, 10, -1);

    }

    private void test(int a, int b, int c, boolean expected) {

        if ( !(switch (a) {

                case 0 -> b == (switch (c) { case 0 -> 0; default -> 1; });

                default -> b == 12;

            })) {

            if (!expected) {

                throw new IllegalStateException();

            }

        } else {

            if (expected) {

                throw new IllegalStateException();

            }

        }

    }

    private void testCommonSuperType(int a, String s1, StringBuilder s2, String expected) {

        String r = (switch (a) {

            case 0 -> s1;

            default -> s2;

        }).toString();

        if (!expected.equals(r)) {

            throw new IllegalStateException();

        }

    }

    private void testSwitchExpressionInConditional(int a, Object o, int expected) {

        int v = a == 0 ? -1

                       : switch (o instanceof String ? 0 : 1) {

                             case 0 -> 0;

                             default -> 1;

                       };

        if (v != expected) {

            throw new IllegalStateException();

        }

    }

    private void testIntBoxing(int a, Integer res, int expected) {

        int r = switch (a) {

            case 0 -> res;

            default -> -1;

        };

        if (r != expected) {

            throw new IllegalStateException();

        }

    }

}