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package com.oracle.graal.python.builtins.modules;

import static com.oracle.graal.python.runtime.PosixConstants.AT_FDCWD;

import java.math.BigInteger;

import org.graalvm.polyglot.Context;
import org.hamcrest.CoreMatchers;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;

import com.oracle.graal.python.builtins.objects.PNone;
import com.oracle.graal.python.runtime.PythonContext;
import com.oracle.graal.python.runtime.object.PythonObjectFactory;
import com.oracle.graal.python.test.PythonTests;

public class DirFdConversionNodeTests extends ConversionNodeTests {

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

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

    @Test
    public void none() {
        Assert.assertEquals(AT_FDCWD.value, call(PNone.NONE));
        Assert.assertEquals(AT_FDCWD.value, call(PNone.NO_VALUE));
    }

    @Test
    public void fdBool() {
        Assert.assertEquals(0, call(false));
        Assert.assertEquals(1, call(true));
    }

    @Test
    public void fdInt() {
        Assert.assertEquals(42, call(42));
    }

    @Test
    public void longFitsInt() {
        Assert.assertEquals(42, call(42L));
    }

    @Test
    public void longTooBig() {
        expectPythonMessage("OverflowError: fd is greater than maximum");
        call(1L << 40);
    }

    @Test
    public void longTooSmall() {
        expectPythonMessage("OverflowError: fd is less than minimum");
        call(-1L << 40);
    }

    @Test
    public void pintFitsInt() {
        Assert.assertEquals(42, call(factory().createInt(BigInteger.valueOf(42))));
    }

    @Test
    public void pintTooBig() {
        expectPythonMessage("OverflowError: fd is greater than maximum");
        call(factory().createInt(BigInteger.ONE.shiftLeft(100)));
    }

    @Test
    public void pintTooSmall() {
        expectPythonMessage("OverflowError: fd is less than minimum");
        call(factory().createInt(BigInteger.ONE.shiftLeft(100).negate()));
    }

    @Test
    public void indexFitsInt() {
        Assert.assertEquals(42, call(evalValue("class C:\n  def __index__(self):\n    return 42\nC()")));
    }

    @Test
    public void indexTooBig() {
        expectPythonMessage("OverflowError: fd is greater than maximum");
        call(evalValue("class C:\n  def __index__(self):\n    return 1 << 40\nC()"));
    }

    @Test
    public void indexTooSmall() {
        expectPythonMessage("OverflowError: fd is less than minimum");
        call(evalValue("class C:\n  def __index__(self):\n    return -1 << 100\nC()"));
    }

    @Test
    public void indexInIntSubclass() {
        Assert.assertEquals(42, call(evalValue("class C(int):\n  def __index__(self):\n    return 123\nC(42)")));
    }

    @Test
    public void unsupportedType1() {
        expectPythonMessage("TypeError: argument should be integer or None, not float");
        call(3.14);
    }

    protected static int call(Object arg) {
        Object result = call(arg, PosixModuleBuiltinsFactory.DirFdConversionNodeGen.create());
        Assert.assertThat(result, CoreMatchers.instanceOf(Integer.class));
        return (int) result;
    }

    private static PythonObjectFactory factory() {
        return PythonObjectFactory.getUncached();
    }

    private static Object evalValue(String source) {
        return PythonContext.get(null).getEnv().asGuestValue(Context.getCurrent().eval("python", source));
    }
}
