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package com.oracle.graal.python.nodes.util;

import java.math.BigInteger;

import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;

import com.oracle.graal.python.builtins.objects.ints.PInt;
import com.oracle.graal.python.test.PythonTests;

public class NarrowBigIntegerNodeTests {

    @Before
    public void setUp() {
        PythonTests.enterContext();
    }

    @After
    public void tearDown() {
        PythonTests.closeContext();
    }

    private static NarrowBigIntegerNode narrow = NarrowBigIntegerNodeGen.getUncached();

    @Test
    public void smallInts() {
        expectInt(-2);
        expectInt(-1);
        expectInt(0);
        expectInt(1);
        expectInt(2);
    }

    @Test
    public void intLongBoundary() {
        expectLong(Integer.MIN_VALUE - 1L);
        expectInt(Integer.MIN_VALUE);
        expectInt(Integer.MIN_VALUE + 1);

        expectInt(Integer.MAX_VALUE - 1);
        expectInt(Integer.MAX_VALUE);
        expectLong(Integer.MAX_VALUE + 1L);
    }

    @Test
    public void long32bitBoundary() {
        expectLong(-0x100000001L);
        expectLong(-0x100000000L);
        expectLong(-0xFFFFFFFFL);

        expectLong(0xFFFFFFFFL);
        expectLong(0x100000000L);
        expectLong(0x100000001L);
    }

    @Test
    public void longPIntBoundary() {
        expectPInt(BigInteger.valueOf(Long.MIN_VALUE).subtract(BigInteger.ONE));
        expectLong(Long.MIN_VALUE);
        expectLong(Long.MIN_VALUE + 1L);

        expectLong(Long.MAX_VALUE - 1L);
        expectLong(Long.MAX_VALUE);
        expectPInt(BigInteger.valueOf(Long.MAX_VALUE).add(BigInteger.ONE));
    }

    private static void expectInt(int expected) {
        Object actual = narrow.execute(BigInteger.valueOf(expected));
        Assert.assertTrue(actual instanceof Integer);
        Assert.assertEquals(expected, (int) actual);
    }

    private static void expectLong(long expected) {
        Object actual = narrow.execute(BigInteger.valueOf(expected));
        Assert.assertTrue(actual instanceof Long);
        Assert.assertEquals(expected, (long) actual);
    }

    private static void expectPInt(BigInteger expected) {
        Object actual = narrow.execute(expected);
        Assert.assertTrue(actual instanceof PInt);
        Assert.assertEquals(expected, ((PInt) actual).getValue());
    }
}
