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 * Copyright (c) 2023, 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
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 */

import org.testng.annotations.Test;

import java.lang.foreign.*;
import java.util.List;
import java.util.Optional;
import java.util.Set;

import org.testng.annotations.*;

import static org.testng.Assert.*;

/*
 * @test
 * @run testng CompositeLookupTest
 */
public class CompositeLookupTest {

    @Test(dataProvider = "testCases")
    public void testLookups(SymbolLookup lookup, List<Result> results) {
        for (Result result : results) {
            switch (result) {
                case Success(String name, long expectedLookupId) -> {
                    Optional<MemorySegment> symbol = lookup.find(name);
                    assertTrue(symbol.isPresent());
                    assertEquals(symbol.get().address(), expectedLookupId);
                }
                case Failure(String name) -> {
                    Optional<MemorySegment> symbol = lookup.find(name);
                    assertFalse(symbol.isPresent());
                }
            }
        }
    }

    static class TestLookup implements SymbolLookup {

        private Set<String> symbols;
        private long id;

        public TestLookup(long id, String... symbols) {
            this.id = id;
            this.symbols = Set.of(symbols);
        }

        @Override
        public Optional<MemorySegment> find(String name) {
            return symbols.contains(name) ?
                    Optional.of(MemorySegment.ofAddress(id)) : Optional.empty();
        }
    }

    sealed interface Result { }
    record Success(String name, long expectedLookupId) implements Result { }
    record Failure(String name) implements Result { }

    @DataProvider(name = "testCases")
    public Object[][] testCases() {
        return new Object[][]{
                {
                    new TestLookup(1, "a", "b", "c")
                            .or(new TestLookup(2,"d", "e", "f"))
                            .or(new TestLookup(3,"g", "h", "i")),
                    List.of(
                            new Success("a", 1),
                            new Success("b", 1),
                            new Success("c", 1),
                            new Success("d", 2),
                            new Success("e", 2),
                            new Success("f", 2),
                            new Success("g", 3),
                            new Success("h", 3),
                            new Success("i", 3),
                            new Failure("j")
                    )
                },
                {
                        new TestLookup(1, "a", "b", "c")
                                .or(new TestLookup(2,"a", "b", "c"))
                                .or(new TestLookup(3,"a", "b", "c")),
                        List.of(
                                new Success("a", 1),
                                new Success("b", 1),
                                new Success("c", 1),
                                new Failure("d")
                        )
                },
                {
                        new TestLookup(1 )
                                .or(new TestLookup(2))
                                .or(new TestLookup(3,"a", "b", "c")),
                        List.of(
                                new Success("a", 3),
                                new Success("b", 3),
                                new Success("c", 3),
                                new Failure("d")
                        )
                },
                {
                        new TestLookup(1, "a", "b", "c")
                                .or(new TestLookup(2,"d")
                                        .or(new TestLookup(3,"e"))
                                        .or(new TestLookup(4,"f")))
                                .or(new TestLookup(5,"g")
                                        .or(new TestLookup(6,"h"))
                                        .or(new TestLookup(7,"i"))),
                        List.of(
                                new Success("a", 1),
                                new Success("b", 1),
                                new Success("c", 1),
                                new Success("d", 2),
                                new Success("e", 3),
                                new Success("f", 4),
                                new Success("g", 5),
                                new Success("h", 6),
                                new Success("i", 7),
                                new Failure("j")
                        )
                },
        };
    }
}