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 *  * terms of the Apache License, Version 2.0 which is available at
 *  * https://www.apache.org/licenses/LICENSE-2.0.
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 *  *  information regarding copyright ownership.
 *  * 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
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package org.eclipse.deeplearning4j.nd4j.linalg.api.ndarray;

import org.junit.jupiter.api.Tag;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.MethodSource;

import org.nd4j.common.tests.tags.NativeTag;
import org.nd4j.common.tests.tags.TagNames;
import org.nd4j.linalg.BaseNd4jTestWithBackends;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.factory.Nd4j;
import org.nd4j.linalg.factory.Nd4jBackend;
import org.nd4j.linalg.indexing.NDArrayIndex;

import java.io.*;

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

@NativeTag
@Tag(TagNames.NDARRAY_SERDE)
public class TestSerialization extends BaseNd4jTestWithBackends {


    @ParameterizedTest
    @MethodSource("org.nd4j.linalg.BaseNd4jTestWithBackends#configs")
    public void testSerializationFullArrayNd4jWriteRead(Nd4jBackend backend) throws Exception {
        int length = 100;
        INDArray arrC = Nd4j.linspace(1, length, length).reshape('c', 10, 10);
        INDArray arrF = Nd4j.linspace(1, length, length).reshape('f', 10, 10);

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        try (DataOutputStream dos = new DataOutputStream(baos)) {
            Nd4j.write(arrC, dos);
        }
        byte[] bytesC = baos.toByteArray();
        baos = new ByteArrayOutputStream();
        try (DataOutputStream dos = new DataOutputStream(baos)) {
            Nd4j.write(arrF, dos);
        }
        byte[] bytesF = baos.toByteArray();

        INDArray arr2C;
        try (DataInputStream dis = new DataInputStream(new ByteArrayInputStream(bytesC))) {
            arr2C = Nd4j.read(dis);
        }
        INDArray arr2F;
        try (DataInputStream dis = new DataInputStream(new ByteArrayInputStream(bytesF))) {
            arr2F = Nd4j.read(dis);
        }

        assertEquals(arrC, arr2C);
        assertEquals(arrF, arr2F);
    }

    @ParameterizedTest
    @MethodSource("org.nd4j.linalg.BaseNd4jTestWithBackends#configs")
    public void testSerializationFullArrayJava(Nd4jBackend backend) throws Exception {
        int length = 100;
        INDArray arrC = Nd4j.linspace(1, length, length).reshape('c', 10, 10);
        INDArray arrF = Nd4j.linspace(1, length, length).reshape('f', 10, 10);

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        try (ObjectOutputStream oos = new ObjectOutputStream(baos)) {
            oos.writeObject(arrC);
        }
        byte[] bytesC = baos.toByteArray();

        baos = new ByteArrayOutputStream();
        try (ObjectOutputStream oos = new ObjectOutputStream(baos)) {
            oos.writeObject(arrF);
        }
        byte[] bytesF = baos.toByteArray();

        INDArray arr2C;
        try (ObjectInputStream ois = new ObjectInputStream(new ByteArrayInputStream(bytesC))) {
            arr2C = (INDArray) ois.readObject();
        }
        INDArray arr2F;
        try (ObjectInputStream ois = new ObjectInputStream(new ByteArrayInputStream(bytesF))) {
            arr2F = (INDArray) ois.readObject();
        }

        assertEquals(arrC, arr2C);
        assertEquals(arrF, arr2F);
    }

    @ParameterizedTest
    @MethodSource("org.nd4j.linalg.BaseNd4jTestWithBackends#configs")
    public void testSerializationOnViewsNd4jWriteRead(Nd4jBackend backend) throws Exception {
        int length = 100;
        INDArray arrC = Nd4j.linspace(1, length, length).reshape('c', 10, 10);
        INDArray arrF = Nd4j.linspace(1, length, length).reshape('f', 10, 10);

        INDArray subC = arrC.get(NDArrayIndex.interval(5, 10), NDArrayIndex.interval(5, 10));
        INDArray subF = arrF.get(NDArrayIndex.interval(5, 10), NDArrayIndex.interval(5, 10));

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        try (DataOutputStream dos = new DataOutputStream(baos)) {
            Nd4j.write(subC, dos);
        }
        byte[] bytesC = baos.toByteArray();

        baos = new ByteArrayOutputStream();
        try (DataOutputStream dos = new DataOutputStream(baos)) {
            Nd4j.write(subF, dos);
        }
        byte[] bytesF = baos.toByteArray();


        INDArray arr2C;
        try (DataInputStream dis = new DataInputStream(new ByteArrayInputStream(bytesC))) {
            arr2C = Nd4j.read(dis);
        }

        INDArray arr2F;
        try (DataInputStream dis = new DataInputStream(new ByteArrayInputStream(bytesF))) {
            arr2F = Nd4j.read(dis);
        }

        assertEquals(subC, arr2C);
        assertEquals(subF, arr2F);
    }

    @ParameterizedTest
    @MethodSource("org.nd4j.linalg.BaseNd4jTestWithBackends#configs")
    public void testSerializationOnViewsJava(Nd4jBackend backend) throws Exception {
        int length = 100;
        INDArray arrC = Nd4j.linspace(1, length, length).reshape('c', 10, 10);
        INDArray arrF = Nd4j.linspace(1, length, length).reshape('f', 10, 10);

        INDArray subC = arrC.get(NDArrayIndex.interval(5, 10), NDArrayIndex.interval(5, 10));
        INDArray subF = arrF.get(NDArrayIndex.interval(5, 10), NDArrayIndex.interval(5, 10));

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        try (ObjectOutputStream oos = new ObjectOutputStream(baos)) {
            oos.writeObject(subC);
        }
        byte[] bytesC = baos.toByteArray();
        baos = new ByteArrayOutputStream();
        try (ObjectOutputStream oos = new ObjectOutputStream(baos)) {
            oos.writeObject(subF);
        }
        byte[] bytesF = baos.toByteArray();

        INDArray arr2C;
        try (ObjectInputStream ois = new ObjectInputStream(new ByteArrayInputStream(bytesC))) {
            arr2C = (INDArray) ois.readObject();
        }
        INDArray arr2F;
        try (ObjectInputStream ois = new ObjectInputStream(new ByteArrayInputStream(bytesF))) {
            arr2F = (INDArray) ois.readObject();
        }

        assertEquals(subC, arr2C);
        assertEquals(subF, arr2F);
    }

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