/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.wayang.core.util;

import org.junit.jupiter.api.Test;

import java.util.Arrays;
import java.util.Collection;
import java.util.List;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertTrue;

/**
 * Test suite for {@link WayangCollections}.
 */
class WayangCollectionsTest {

    @Test
    void testCreatePowerList() {
        final List<Integer> list = WayangArrays.asList(0, 1, 2, 3, 4);
        final Collection<List<Integer>> powerList = WayangCollections.createPowerList(list, 3);
        assertEquals(1 + 5 + 10 + 10, powerList.size());
        List<List<Integer>> expectedPowerSetMembers = Arrays.asList(
                WayangArrays.asList(),
                WayangArrays.asList(0), WayangArrays.asList(1), WayangArrays.asList(2), WayangArrays.asList(3), WayangArrays.asList(4),
                WayangArrays.asList(0, 1), WayangArrays.asList(0, 2), WayangArrays.asList(0, 3), WayangArrays.asList(0, 4), WayangArrays.asList(1, 2),
                WayangArrays.asList(1, 3), WayangArrays.asList(1, 4), WayangArrays.asList(2, 3), WayangArrays.asList(2, 4), WayangArrays.asList(3, 4),
                WayangArrays.asList(0, 1, 2), WayangArrays.asList(0, 1, 3), WayangArrays.asList(0, 1, 4), WayangArrays.asList(0, 2, 3), WayangArrays.asList(0, 2, 4),
                WayangArrays.asList(0, 3, 4), WayangArrays.asList(1, 2, 3), WayangArrays.asList(1, 2, 4), WayangArrays.asList(1, 3, 4), WayangArrays.asList(2, 3, 4)
        );
        for (List<Integer> expectedPowerSetMember : expectedPowerSetMembers) {
            assertTrue(powerList.contains(expectedPowerSetMember), String.format("%s is not contained in %s.", expectedPowerSetMember, powerList));
        }
    }

}
