/*
 *  ******************************************************************************
 *  *
 *  *
 *  * 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.
 *  *
 *  *  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
 *  * under the License.
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 *  * SPDX-License-Identifier: Apache-2.0
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 */

import org.junit.jupiter.api.Disabled;
import org.nd4j.python4j.Python;
import org.nd4j.python4j.PythonGC;
import org.nd4j.python4j.PythonGIL;
import org.nd4j.python4j.PythonObject;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
import org.nd4j.linalg.factory.Nd4j;

import javax.annotation.concurrent.NotThreadSafe;


@NotThreadSafe
public class PythonNumpyGCTest {

    @Test
    @Disabled //crashes, to be investigated
    public void testGC() {
        try(PythonGIL pythonGIL = PythonGIL.lock()) {
            PythonObject gcModule = Python.importModule("gc");
            PythonObject getObjects = gcModule.attr("get_objects");
            PythonObject pyObjCount1 = Python.len(getObjects.call());
            long objCount1 =  pyObjCount1.toLong();
            PythonObject pyList = Python.list();
            pyList.attr("append").call(new PythonObject(Nd4j.linspace(1, 10, 10)));
            pyList.attr("append").call(1.0);
            pyList.attr("append").call(true);
            PythonObject pyObjCount2 = Python.len(getObjects.call());
            long objCount2 =  pyObjCount2.toLong();
            long diff = objCount2 - objCount1;
            Assertions.assertTrue(diff > 2);
            try(PythonGC gc = PythonGC.watch()){
                PythonObject pyList2 = Python.list();
                pyList2.attr("append").call(new PythonObject(Nd4j.linspace(1, 10, 10)));
                pyList2.attr("append").call(1.0);
                pyList2.attr("append").call(true);
            }
            PythonObject pyObjCount3 = Python.len(getObjects.call());
            long objCount3 =  pyObjCount3.toLong();
            diff = objCount3 - objCount2;
            Assertions.assertTrue(diff <= 2);// 2 objects created during function call
        }

    }
}
