/*-
 * ============LICENSE_START=======================================================
 * ONAP - SO
 * ================================================================================
 * Copyright (C) 2017 - 2018 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://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.
 * ============LICENSE_END=========================================================
 */

package org.onap.so.bpmn.servicedecomposition;

import java.io.ByteArrayOutputStream;
import java.io.Externalizable;
import java.io.File;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;
import org.camunda.bpm.engine.delegate.DelegateExecution;
import org.camunda.bpm.engine.impl.pvm.runtime.ExecutionImpl;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
import org.onap.so.bpmn.common.BuildingBlockExecution;
import org.onap.so.bpmn.common.DelegateExecutionImpl;
import org.onap.so.bpmn.servicedecomposition.entities.GeneralBuildingBlock;
import org.onap.so.bpmn.servicedecomposition.entities.ResourceKey;
import com.fasterxml.jackson.databind.ObjectMapper;

public class SerializationTest {

    private static final String RESOURCE_PATH = "src/test/resources/__files/ExecuteBuildingBlock/";
    private static final String FLOW_VAR_NAME = "flowToBeCalled";
    private static final String LOOKUP_KEY_MAP_VAR_NAME = "lookupKeyMap";
    private static final String GBB_INPUT_VAR_NAME = "gBBInput";
    protected ObjectMapper mapper = new ObjectMapper();

    @Test
    public void testSerializationOfAllPojos() throws IOException {
        GeneralBuildingBlock gbb = mapper.readValue(new File(RESOURCE_PATH + "GeneralBuildingBlockExpected.json"),
                GeneralBuildingBlock.class);
        Map<ResourceKey, String> lookupKeyMap = new HashMap<>();
        DelegateExecution execution = new ExecutionImpl();
        execution.setVariable(FLOW_VAR_NAME, "AssignServiceInstanceBB");
        execution.setVariable(GBB_INPUT_VAR_NAME, gbb);
        execution.setVariable(LOOKUP_KEY_MAP_VAR_NAME, lookupKeyMap);
        System.out.println(execution.getVariables());
        BuildingBlockExecution gBuildingBlockExecution = new DelegateExecutionImpl(execution);
        boolean isSerializable = SerializationTest.isSerializable(gBuildingBlockExecution);
        assertEquals(true, isSerializable);
    }

    public static boolean isSerializable(final Object o) {
        final boolean retVal;

        if (implementsInterface(o)) {
            retVal = attemptToSerialize(o);
        } else {
            retVal = false;
        }

        return (retVal);
    }

    private static boolean implementsInterface(final Object o) {
        final boolean retVal;

        retVal = ((o instanceof Serializable) || (o instanceof Externalizable));

        return (retVal);
    }

    private static boolean attemptToSerialize(final Object o) {
        final OutputStream sink;
        ObjectOutputStream stream;

        stream = null;

        try {
            sink = new ByteArrayOutputStream();
            stream = new ObjectOutputStream(sink);
            stream.writeObject(o);
            // could also re-serilalize at this point too
        } catch (final IOException ex) {
            return (false);
        } finally {
            if (stream != null) {
                try {
                    stream.close();
                } catch (final IOException ex) {
                    // should not be able to happen
                }
            }
        }

        return (true);
    }
}