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package com.oracle.truffle.api.test.profiles;

import static com.oracle.truffle.api.test.ReflectionUtils.getStaticField;
import static com.oracle.truffle.api.test.ReflectionUtils.invoke;
import static com.oracle.truffle.api.test.ReflectionUtils.invokeStatic;
import static com.oracle.truffle.api.test.ReflectionUtils.loadRelative;
import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertThat;

import org.junit.Before;
import org.junit.Test;
import org.junit.experimental.theories.DataPoint;
import org.junit.experimental.theories.Theories;
import org.junit.experimental.theories.Theory;
import org.junit.runner.RunWith;

import com.oracle.truffle.api.profiles.IntValueProfile;

@RunWith(Theories.class)
public class IntValueProfileTest {

    @DataPoint public static final int VALUE0 = Integer.MIN_VALUE;
    @DataPoint public static final int VALUE1 = 0;
    @DataPoint public static final int VALUE2 = 14;
    @DataPoint public static final int VALUE3 = Integer.MAX_VALUE;

    private IntValueProfile profile;

    @Before
    public void create() {
        profile = (IntValueProfile) invokeStatic(loadRelative(this.getClass(), "IntValueProfile$Enabled"), "create");
    }

    private static boolean isGeneric(IntValueProfile profile) {
        return (boolean) invoke(profile, "isGeneric");
    }

    private static boolean isUninitialized(IntValueProfile profile) {
        return (boolean) invoke(profile, "isUninitialized");
    }

    private static int getCachedValue(IntValueProfile profile) {
        return (int) invoke(profile, "getCachedValue");
    }

    @Test
    public void testInitial() {
        assertThat(isGeneric(profile), is(false));
        assertThat(isUninitialized(profile), is(true));
        profile.toString(); // test that it is not crashing
    }

    @Theory
    public void testProfileOneObject(int value) {
        int result = profile.profile(value);

        assertThat(result, is(value));
        assertEquals(getCachedValue(profile), value);
        assertThat(isUninitialized(profile), is(false));
        profile.toString(); // test that it is not crashing
    }

    @Theory
    public void testProfileTwoObject(int value0, int value1) {
        int result0 = profile.profile(value0);
        int result1 = profile.profile(value1);

        assertThat(result0, is(value0));
        assertThat(result1, is(value1));

        if (value0 == value1) {
            assertThat(getCachedValue(profile), is(value0));
            assertThat(isGeneric(profile), is(false));
        } else {
            assertThat(isGeneric(profile), is(true));
        }
        assertThat(isUninitialized(profile), is(false));
        profile.toString(); // test that it is not crashing
    }

    @Theory
    public void testProfileThreeObject(int value0, int value1, int value2) {
        int result0 = profile.profile(value0);
        int result1 = profile.profile(value1);
        int result2 = profile.profile(value2);

        assertThat(result0, is(value0));
        assertThat(result1, is(value1));
        assertThat(result2, is(value2));

        if (value0 == value1 && value1 == value2) {
            assertThat(getCachedValue(profile), is(value0));
            assertThat(isGeneric(profile), is(false));
        } else {
            assertThat(isGeneric(profile), is(true));
        }
        assertThat(isUninitialized(profile), is(false));
        profile.toString(); // test that it is not crashing
    }

    @Test
    public void testDisabled() {
        IntValueProfile p = (IntValueProfile) getStaticField(loadRelative(IntValueProfileTest.class, "IntValueProfile$Disabled"), "INSTANCE");
        assertThat(p.profile(VALUE0), is(VALUE0));
        assertThat(p.profile(VALUE1), is(VALUE1));
        assertThat(p.profile(VALUE2), is(VALUE2));
        assertThat(p.profile(VALUE3), is(VALUE3));
        p.toString(); // test that it is not crashing
    }

}