/*
 * Copyright 2013 MovingBlocks
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.terasology.math;

import com.google.common.collect.Lists;
import com.google.common.collect.Sets;
import org.junit.Test;
import org.terasology.math.geom.Vector3i;

import java.util.Iterator;
import java.util.Set;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

/**
 */
public class Diamond3iIteratorTest {

    @Test
    public void testZeroDistanceIteration() {
        Iterator<Vector3i> iter = Diamond3iIterator.iterate(Vector3i.zero(), 0).iterator();
        assertEquals(Lists.newArrayList(Vector3i.zero()), Lists.newArrayList(iter));
    }

    @Test
    public void testOneDistanceIteration() {
        Iterator<Vector3i> iter = Diamond3iIterator.iterate(Vector3i.zero(), 1).iterator();
        Set<Vector3i> expected = Sets.newHashSet(Vector3i.zero(), new Vector3i(1, 0, 0), new Vector3i(-1, 0, 0), new Vector3i(0, 1, 0),
                new Vector3i(0, -1, 0), new Vector3i(0, 0, 1), new Vector3i(0, 0, -1));
        while (iter.hasNext()) {
            Vector3i next = iter.next();
            assertTrue("Received Unexpected: " + next, expected.remove(next));
        }
        assertTrue("Missing: " + expected, expected.isEmpty());
    }

    @Test
    public void testTwoDistanceIteration() {
        Set<Vector3i> iter = Sets.newHashSet(Diamond3iIterator.iterate(Vector3i.zero(), 2));
        assertEquals(25, iter.size());
        for (Vector3i pos : iter) {
            assertTrue(pos.gridDistance(new Vector3i()) <= 2);
        }
    }

    @Test
    public void testThreeDistanceOnlyIteration() {
        Set<Vector3i> iter = Sets.newHashSet(Diamond3iIterator.iterateAtDistance(new Vector3i(), 3));
        assertEquals(38, iter.size());
        for (Vector3i pos : iter) {
            assertTrue(pos.gridDistance(new Vector3i()) == 3);
        }
    }
}