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/* @test

 * @summary Basic functional test of OptionalDouble

 * @author Mike Duigou

 * @run testng BasicDouble

 */

import java.util.NoSuchElementException;

import java.util.OptionalDouble;

import java.util.concurrent.atomic.AtomicBoolean;

import java.util.stream.DoubleStream;

import static org.testng.Assert.*;

import org.testng.annotations.Test;

public class BasicDouble {

    @Test(groups = "unit")

    public void testEmpty() {

        OptionalDouble empty = OptionalDouble.empty();

        OptionalDouble present = OptionalDouble.of(1.0);

        // empty

        assertTrue(empty.equals(empty));

        assertTrue(empty.equals(OptionalDouble.empty()));

        assertTrue(!empty.equals(present));

        assertTrue(0 == empty.hashCode());

        assertTrue(!empty.toString().isEmpty());

        assertTrue(!empty.isPresent());

        empty.ifPresent(v -> { fail(); });

        AtomicBoolean emptyCheck = new AtomicBoolean();

        empty.ifPresentOrElse(v -> fail(), () -> emptyCheck.set(true));

        assertTrue(emptyCheck.get());

        try {

            empty.ifPresentOrElse(v -> fail(), () -> { throw new ObscureException(); });

            fail();

        } catch (ObscureException expected) {

        } catch (AssertionError e) {

            throw e;

        } catch (Throwable t) {

            fail();

        }

        assertEquals(2.0, empty.orElse(2.0));

        assertEquals(2.0, empty.orElseGet(()-> 2.0));

    }

    @Test(groups = "unit")

    public void testIfPresentAndOrElseAndNull() {

        OptionalDouble empty = OptionalDouble.empty();

        OptionalDouble present = OptionalDouble.of(1.0);

        // No NPE

        present.ifPresentOrElse(v -> {}, null);

        empty.ifPresent(null);

        empty.ifPresentOrElse(null, () -> {});

        // NPE

        try {

            present.ifPresent(null);

            fail();

        } catch (NullPointerException ex) {}

        try {

            present.ifPresentOrElse(null, () -> {});

            fail();

        } catch (NullPointerException ex) {}

        try {

            empty.ifPresentOrElse(v -> {}, null);

            fail();

        } catch (NullPointerException ex) {}

    }

    @Test(expectedExceptions=NoSuchElementException.class)

    public void testEmptyGet() {

        OptionalDouble empty = OptionalDouble.empty();

        double got = empty.getAsDouble();

    }

    @Test(expectedExceptions=NullPointerException.class)

    public void testEmptyOrElseGetNull() {

        OptionalDouble empty = OptionalDouble.empty();

        double got = empty.orElseGet(null);

    }

    @Test(expectedExceptions=NullPointerException.class)

    public void testEmptyOrElseThrowNull() throws Throwable {

        OptionalDouble empty = OptionalDouble.empty();

        double got = empty.orElseThrow(null);

    }

    @Test(expectedExceptions=ObscureException.class)

    public void testEmptyOrElseThrow() throws Exception {

        OptionalDouble empty = OptionalDouble.empty();

        double got = empty.orElseThrow(ObscureException::new);

    }

    @Test(groups = "unit")

    public void testPresent() {

        OptionalDouble empty = OptionalDouble.empty();

        OptionalDouble present = OptionalDouble.of(1.0);

        // present

        assertTrue(present.equals(present));

        assertFalse(present.equals(OptionalDouble.of(0.0)));

        assertTrue(present.equals(OptionalDouble.of(1.0)));

        assertTrue(!present.equals(empty));

        assertTrue(Double.hashCode(1.0) == present.hashCode());

        assertFalse(present.toString().isEmpty());

        assertTrue(-1 != present.toString().indexOf(Double.toString(present.getAsDouble()).toString()));

        assertEquals(1.0, present.getAsDouble());

        AtomicBoolean presentCheck = new AtomicBoolean();

        present.ifPresent(v -> presentCheck.set(true));

        assertTrue(presentCheck.get());

        presentCheck.set(false);

        present.ifPresentOrElse(v -> presentCheck.set(true), () -> fail());

        assertTrue(presentCheck.get());

        try {

            present.ifPresent(v -> { throw new ObscureException(); });

            fail();

        } catch (ObscureException expected) {

        } catch (AssertionError e) {

            throw e;

        } catch (Throwable t) {

            fail();

        }

        try {

            present.ifPresentOrElse(v -> { throw new ObscureException(); }, () -> fail());

            fail();

        } catch (ObscureException expected) {

        } catch (AssertionError e) {

            throw e;

        } catch (Throwable t) {

            fail();

        }

        assertEquals(1.0, present.orElse(2.0));

        assertEquals(1.0, present.orElseGet(null));

        assertEquals(1.0, present.orElseGet(()-> 2.0));

        assertEquals(1.0, present.orElseGet(()-> 3.0));

        assertEquals(1.0, present.<RuntimeException>orElseThrow(null));

        assertEquals(1.0, present.<RuntimeException>orElseThrow(ObscureException::new));

    }

    @Test(groups = "unit")

    public void testStream() {

        {

            DoubleStream s = OptionalDouble.empty().stream();

            assertFalse(s.isParallel());

            double[] es = s.toArray();

            assertEquals(es.length, 0);

        }

        {

            DoubleStream s = OptionalDouble.of(42.0).stream();

            assertFalse(s.isParallel());

            double[] es = s.toArray();

            assertEquals(es.length, 1);

            assertEquals(es[0], 42.0);

        }

    }

    private static class ObscureException extends RuntimeException {

    }

}