/*******************************************************************************
 * 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.workspace;

import lombok.extern.slf4j.Slf4j;
import lombok.val;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.nd4j.linalg.BaseNd4jTest;
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 org.nd4j.linalg.factory.Nd4jBackend;

import static org.junit.Assert.assertEquals;

@Slf4j
@RunWith(Parameterized.class)
public class CudaWorkspaceTests extends BaseNd4jTest {
    private DataType initialType;

    public CudaWorkspaceTests(Nd4jBackend backend) {
        super(backend);
        this.initialType = Nd4j.dataType();
    }


    @Test
    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("Got non-zero array " + zeros + " after " + cnt + " iterations !", 0d, zeros.sumNumber().doubleValue(), 1e-10);
                zeros.putScalar(0, 1);
            }
        }

    }


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