/*******************************************************************************
 * Copyright (c) 2015-2018 Skymind, Inc.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Apache License, Version 2.0 which is available at
 * https://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.
 *
 * SPDX-License-Identifier: Apache-2.0
 ******************************************************************************/

package org.nd4j.linalg.util;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.nd4j.linalg.BaseNd4jTest;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.factory.Nd4jBackend;

import static org.junit.Assert.assertEquals;

/**
 * @author Hamdi Douss
 */
@RunWith(Parameterized.class)
public class NDArrayUtilTest extends BaseNd4jTest {

    public NDArrayUtilTest(Nd4jBackend backend) {
        super(backend);
    }

    @Test
    public void testMatrixConversion() {
        int[][] nums = {{1, 2}, {3, 4}, {5, 6}};
        INDArray result = NDArrayUtil.toNDArray(nums);
        assertArrayEquals(new long[]{2,3}, result.shape());
    }

    @Test
    public void testVectorConversion() {
        int[] nums = {1, 2, 3, 4};
        INDArray result = NDArrayUtil.toNDArray(nums);
        assertArrayEquals(new long[]{1, 4}, result.shape());
    }


    @Test
    public void testFlattenArray1() {
        float[][][] arrX = new float[2][2][2];

        float[] arrZ = ArrayUtil.flatten(arrX);

        assertEquals(8, arrZ.length);
    }

    @Test
    public void testFlattenArray2() {
        float[][][] arrX = new float[5][4][3];

        float[] arrZ = ArrayUtil.flatten(arrX);

        assertEquals(60, arrZ.length);
    }


    @Test
    public void testFlattenArray3() {
        float[][][] arrX = new float[5][2][3];

        float[] arrZ = ArrayUtil.flatten(arrX);

        assertEquals(30, arrZ.length);
    }

    @Test
    public void testFlattenArray4() {
        float[][][][] arrX = new float[5][2][3][3];

        float[] arrZ = ArrayUtil.flatten(arrX);

        assertEquals(90, arrZ.length);
    }

    @Override
    public char ordering() {
        return 'f';
    }
}
