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/*-
 * ============LICENSE_START=======================================================
 * vfc
 * ================================================================================
 * Copyright (C) 2018-2019 AT&T Intellectual Property. All rights reserved.
 * Modifications Copyright (C) 2019 Nordix Foundation.. All rights reserved.
 * Modifications Copyright (C) 2018-2019 AT&T Corporation. 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.policy.vfc;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;
import static org.mockito.ArgumentMatchers.anyMap;
import static org.mockito.ArgumentMatchers.anyString;
import static org.mockito.ArgumentMatchers.endsWith;
import static org.mockito.ArgumentMatchers.eq;
import static org.mockito.ArgumentMatchers.startsWith;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

import java.util.ArrayList;
import java.util.List;
import java.util.UUID;

import org.junit.Before;
import org.junit.Test;
import org.onap.policy.rest.RestManager;
import org.onap.policy.rest.RestManager.Pair;
import org.onap.policy.vfc.VfcManager.VfcCallback;
import org.onap.policy.vfc.util.Serialization;

public class VfcManagerTest implements VfcCallback {

    private RestManager   mockedRestManager;

    private Pair<Integer, String> httpResponsePutOk;
    private Pair<Integer, String> httpResponseGetOk;
    private Pair<Integer, String> httpResponseBadResponse;
    private Pair<Integer, String> httpResponseErr;

    private VfcRequest  request;
    private VfcResponse response;

    /**
     * Set up the mocked REST manager.
     */
    @Before
    public void setupMockedRest() {
        mockedRestManager   = mock(RestManager.class);

        httpResponsePutOk       = mockedRestManager.new Pair<>(202, Serialization.gsonPretty.toJson(response));
        httpResponseGetOk       = mockedRestManager.new Pair<>(200, Serialization.gsonPretty.toJson(response));
        httpResponseBadResponse = mockedRestManager.new Pair<>(202, Serialization.gsonPretty.toJson(null));
        httpResponseErr         = mockedRestManager.new Pair<>(200, null);
    }

    /**
     * Create the request and response before.
     */
    @Before
    public void createRequestAndResponse() {
        VfcHealActionVmInfo actionInfo = new VfcHealActionVmInfo();
        actionInfo.setVmid("TheWizard");
        actionInfo.setVmname("The Wizard of Oz");

        VfcHealAdditionalParams additionalParams = new VfcHealAdditionalParams();
        additionalParams.setAction("Go Home");
        additionalParams.setActionInfo(actionInfo);

        VfcHealRequest healRequest = new VfcHealRequest();
        healRequest.setAdditionalParams(additionalParams);
        healRequest.setCause("WestWitch");
        healRequest.setVnfInstanceId("EmeraldCity");

        final UUID requestId = UUID.randomUUID();
        request = new VfcRequest();
        request.setHealRequest(healRequest);
        request.setNsInstanceId("Dorothy");
        request.setRequestId(requestId);

        List<VfcResponseDescriptor> responseHistoryList = new ArrayList<>();;

        VfcResponseDescriptor responseDescriptor = new VfcResponseDescriptor();
        responseDescriptor.setErrorCode("1234");
        responseDescriptor.setProgress("Follow The Yellow Brick Road");
        responseDescriptor.setResponseHistoryList(responseHistoryList);
        responseDescriptor.setResponseId(UUID.randomUUID().toString());
        responseDescriptor.setStatus("finished");
        responseDescriptor.setStatusDescription("There's no place like home");

        response = new VfcResponse();
        response.setJobId("1234");
        response.setRequestId(request.getRequestId().toString());
        response.setResponseDescriptor(responseDescriptor);
    }

    @Test
    public void testVfcInitiation() {
        try {
            new VfcManager(null, null, null, null, null);
            fail("test should throw an exception here");
        }
        catch (IllegalArgumentException e) {
            assertEquals("the parameters \"cb\" and \"request\" on the VfcManager constructor may not be null",
                    e.getMessage());
        }

        try {
            new VfcManager(this, null, null, null, null);
            fail("test should throw an exception here");
        }
        catch (IllegalArgumentException e) {
            assertEquals("the parameters \"cb\" and \"request\" on the VfcManager constructor may not be null",
                    e.getMessage());
        }

        try {
            new VfcManager(this, request, null, null, null);
            fail("test should throw an exception here");
        }
        catch (IllegalArgumentException e) {
            assertEquals("the \"url\" parameter on the VfcManager constructor may not be null",
                    e.getMessage());
        }

        new VfcManager(this, request, "http://somewhere.over.the.rainbow", null, null);

        new VfcManager(this, request, "http://somewhere.over.the.rainbow", "Dorothy", "Toto");
    }

    @Test
    public void testVfcExecutionException() throws InterruptedException {
        VfcManager manager = new VfcManager(this, request, "http://somewhere.over.the.rainbow", "Dorothy", "Exception");
        manager.setRestManager(mockedRestManager);

        Thread managerThread = new Thread(manager);
        managerThread.start();

        when(mockedRestManager.post(
            startsWith("http://somewhere.over.the.rainbow"),
            eq("Dorothy"),
            eq("Exception"),
            anyMap(),
            anyString(),
            anyString()))
            .thenThrow(new RuntimeException("OzException"));

        managerThread.join();
    }

    @Test
    public void testVfcExecutionNull() throws InterruptedException {
        VfcManager manager = new VfcManager(this, request, "http://somewhere.over.the.rainbow", "Dorothy", "Null");
        manager.setRestManager(mockedRestManager);

        Thread managerThread = new Thread(manager);
        managerThread.start();

        when(mockedRestManager.post(startsWith("http://somewhere.over.the.rainbow"),
                eq("Dorothy"), eq("Null"), anyMap(), anyString(), anyString()))
                .thenReturn(null);

        managerThread.join();
    }

    @Test
    public void testVfcExecutionError0() throws InterruptedException {
        VfcManager manager = new VfcManager(this, request, "http://somewhere.over.the.rainbow", "Dorothy", "Error0");
        manager.setRestManager(mockedRestManager);

        Thread managerThread = new Thread(manager);
        managerThread.start();

        when(mockedRestManager.post(startsWith("http://somewhere.over.the.rainbow"),
                eq("Dorothy"), eq("Error0"), anyMap(), anyString(), anyString()))
                .thenReturn(httpResponseErr);

        managerThread.join();
    }

    @Test
    public void testVfcExecutionBadResponse() throws InterruptedException {
        VfcManager manager = new VfcManager(this, request, "http://somewhere.over.the.rainbow", "Dorothy", "BadResponse");
        manager.setRestManager(mockedRestManager);

        Thread managerThread = new Thread(manager);
        managerThread.start();

        when(mockedRestManager.post(startsWith("http://somewhere.over.the.rainbow"),
                eq("Dorothy"), eq("OK"), anyMap(), anyString(), anyString()))
                .thenReturn(httpResponseBadResponse);

        managerThread.join();
    }

    @Test
    public void testVfcExecutionOk() throws InterruptedException {
        VfcManager manager = new VfcManager(this, request, "http://somewhere.over.the.rainbow", "Dorothy", "Ok");
        manager.setRestManager(mockedRestManager);

        Thread managerThread = new Thread(manager);
        managerThread.start();

        when(mockedRestManager.post(startsWith("http://somewhere.over.the.rainbow"),
                eq("Dorothy"), eq("OK"), anyMap(), anyString(), anyString()))
                .thenReturn(httpResponsePutOk);

        when(mockedRestManager.get(endsWith("1234"), eq("Dorothy"), eq("OK"), anyMap()))
            .thenReturn(httpResponseGetOk);

        managerThread.join();
    }

    @Override
    public void onResponse(VfcResponse responseError) {
        //
        // Nothing needs to be done
        //
    }
}