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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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 *  *  See the NOTICE file distributed with this work for additional
 *  *  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.workspace;

import lombok.extern.slf4j.Slf4j;
import lombok.val;
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.buffer.DataType;
import org.nd4j.linalg.api.memory.conf.WorkspaceConfiguration;
import org.nd4j.linalg.api.memory.enums.MirroringPolicy;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.api.ops.executioner.OpExecutioner;
import org.nd4j.linalg.factory.Nd4j;

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

@Slf4j
@Tag(TagNames.WORKSPACES)
@NativeTag
public class CudaWorkspaceTests extends BaseNd4jTestWithBackends {
    private DataType initialType = Nd4j.dataType();



    @ParameterizedTest
    @MethodSource("org.nd4j.linalg.BaseNd4jTestWithBackends#configs")
    public void testWorkspaceReuse() {
        if (Nd4j.getExecutioner().type() != OpExecutioner.ExecutionerType.CUDA)
            return;

        val workspaceConfig = WorkspaceConfiguration.builder()
                .policyMirroring(MirroringPolicy.HOST_ONLY) // Commenting this out makes it so that assert is not triggered (for at least 40 secs or so...)
                .build();
        int cnt = 0;

        for (int  e = 0; e < 10; e++) {
            try (val ws = Nd4j.getWorkspaceManager().getAndActivateWorkspace(workspaceConfig, "test")) {
                final INDArray zeros = Nd4j.zeros(4, 'f');
                //final INDArray zeros = Nd4j.create(4, 'f'); // Also fails, but maybe less of an issue as javadoc does not say that one can expect returned array to be all zeros.
                assertEquals( 0d, zeros.sumNumber().doubleValue(), 1e-10,"Got non-zero array " + zeros + " after " + cnt + " iterations !");
                zeros.putScalar(0, 1);
            }
        }

    }


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