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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * version 2 for more details (a copy is included in the LICENSE file that
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/*
 * @test
 * @run testng/othervm --enable-native-access=ALL-UNNAMED TestFunctionDescriptor
 */

import java.lang.foreign.FunctionDescriptor;
import java.lang.foreign.MemoryLayout;
import java.lang.foreign.MemorySegment;
import java.lang.invoke.MethodType;
import java.util.List;
import java.util.Optional;
import org.testng.annotations.Test;

import static org.testng.Assert.assertEquals;
import static org.testng.Assert.assertFalse;
import static org.testng.Assert.assertNotEquals;
import static org.testng.Assert.assertTrue;

public class TestFunctionDescriptor extends NativeTestHelper {

    static final String DUMMY_ATTR = "dummy";

    @Test
    public void testOf() {
        FunctionDescriptor fd = FunctionDescriptor.of(C_INT, C_DOUBLE, C_LONG_LONG);

        assertEquals(fd.argumentLayouts(), List.of(C_DOUBLE, C_LONG_LONG));
        Optional<MemoryLayout> returnLayoutOp = fd.returnLayout();
        assertTrue(returnLayoutOp.isPresent());
        assertEquals(returnLayoutOp.get(), C_INT);
    }

    @Test
    public void testOfVoid() {
        FunctionDescriptor fd = FunctionDescriptor.ofVoid(C_DOUBLE, C_LONG_LONG);

        assertEquals(fd.argumentLayouts(), List.of(C_DOUBLE, C_LONG_LONG));
        Optional<MemoryLayout> returnLayoutOp = fd.returnLayout();
        assertFalse(returnLayoutOp.isPresent());
    }

    @Test
    public void testAppendArgumentLayouts() {
        FunctionDescriptor fd = FunctionDescriptor.of(C_INT, C_DOUBLE, C_LONG_LONG);
        fd = fd.appendArgumentLayouts(C_POINTER);

        assertEquals(fd.argumentLayouts(), List.of(C_DOUBLE, C_LONG_LONG, C_POINTER));
        Optional<MemoryLayout> returnLayoutOp = fd.returnLayout();
        assertTrue(returnLayoutOp.isPresent());
        assertEquals(returnLayoutOp.get(), C_INT);
    }

    @Test
    public void testChangeReturnLayout() {
        FunctionDescriptor fd = FunctionDescriptor.of(C_INT, C_DOUBLE, C_LONG_LONG);
        fd = fd.changeReturnLayout(C_INT);

        assertEquals(fd.argumentLayouts(), List.of(C_DOUBLE, C_LONG_LONG));
        Optional<MemoryLayout> returnLayoutOp = fd.returnLayout();
        assertTrue(returnLayoutOp.isPresent());
        assertEquals(returnLayoutOp.get(), C_INT);
    }

    @Test
    public void testDropReturnLayout() {
        FunctionDescriptor fd = FunctionDescriptor.of(C_INT, C_DOUBLE, C_LONG_LONG);
        fd = fd.dropReturnLayout();

        assertEquals(fd.argumentLayouts(), List.of(C_DOUBLE, C_LONG_LONG));
        Optional<MemoryLayout> returnLayoutOp = fd.returnLayout();
        assertFalse(returnLayoutOp.isPresent());
    }

    @Test
    public void testEquals() {
        FunctionDescriptor fd = FunctionDescriptor.of(C_INT, C_INT, C_INT);
        assertEquals(fd, fd);
        FunctionDescriptor fdReturnSomethingElse = FunctionDescriptor.of(C_LONG_LONG, C_INT, C_INT);
        FunctionDescriptor fdOtherArguments = FunctionDescriptor.of(C_INT, C_INT);
        assertFalse(fd.equals(fdReturnSomethingElse));
        assertFalse(fd.equals(fdOtherArguments));
        assertFalse(fd.equals(null));
        assertFalse(fd.equals("A"));
    }

    @Test
    public void testCarrierMethodType() {
        FunctionDescriptor fd = FunctionDescriptor.of(C_INT,
                C_INT,
                MemoryLayout.structLayout(C_INT, C_INT),
                MemoryLayout.sequenceLayout(3, C_INT));
        MethodType cmt = fd.toMethodType();
        assertEquals(cmt, MethodType.methodType(int.class, int.class, MemorySegment.class, MemorySegment.class));
    }

    @Test(expectedExceptions = IllegalArgumentException.class)
    public void testBadCarrierMethodType() {
        FunctionDescriptor fd = FunctionDescriptor.of(C_INT,
                C_INT,
                MemoryLayout.structLayout(C_INT, C_INT),
                MemoryLayout.sequenceLayout(3, C_INT),
                MemoryLayout.paddingLayout(4));
        fd.toMethodType(); // should throw
    }

    @Test(expectedExceptions = IllegalArgumentException.class)
    public void testIllegalInsertArgNegIndex() {
        FunctionDescriptor fd = FunctionDescriptor.of(C_INT);
        fd.insertArgumentLayouts(-1, C_INT);
    }

    @Test(expectedExceptions = IllegalArgumentException.class)
    public void testIllegalInsertArgOutOfBounds() {
        FunctionDescriptor fd = FunctionDescriptor.of(C_INT);
        fd.insertArgumentLayouts(2, C_INT);
    }

    @Test(expectedExceptions = IllegalArgumentException.class)
    public void testBadPaddingInVoidFunction() {
        FunctionDescriptor.ofVoid(MemoryLayout.paddingLayout(1));
    }

    @Test(expectedExceptions = IllegalArgumentException.class)
    public void testBadPaddingInNonVoidFunction() {
        FunctionDescriptor.of(MemoryLayout.paddingLayout(1));
    }

    @Test(expectedExceptions = IllegalArgumentException.class)
    public void testBadPaddingInAppendArgLayouts() {
        FunctionDescriptor.ofVoid().appendArgumentLayouts(MemoryLayout.paddingLayout(1));
    }

    @Test(expectedExceptions = IllegalArgumentException.class)
    public void testBadPaddingInInsertArgLayouts() {
        FunctionDescriptor.ofVoid().insertArgumentLayouts(0, MemoryLayout.paddingLayout(1));
    }

    @Test(expectedExceptions = IllegalArgumentException.class)
    public void testBadPaddingInChangeRetLayout() {
        FunctionDescriptor.ofVoid().changeReturnLayout(MemoryLayout.paddingLayout(1));
    }

}