/*-
 * ============LICENSE_START=======================================================
 * ONAP
 * ================================================================================
 * Copyright (C) 2020 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.policy.controlloop.actor.so;

import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertSame;
import static org.junit.Assert.assertTrue;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.never;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

import java.net.http.HttpHeaders;
import java.net.http.HttpRequest;
import java.net.http.HttpRequest.Builder;
import java.net.http.HttpResponse;
import java.net.http.HttpResponse.BodyHandlers;
import java.nio.charset.StandardCharsets;
import java.util.Base64;
import java.util.Map;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import javax.ws.rs.client.InvocationCallback;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import org.apache.commons.lang3.tuple.Pair;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
import org.mockito.ArgumentCaptor;
import org.mockito.Mock;
import org.onap.aai.domain.yang.CloudRegion;
import org.onap.aai.domain.yang.GenericVnf;
import org.onap.aai.domain.yang.ModelVer;
import org.onap.aai.domain.yang.ServiceInstance;
import org.onap.aai.domain.yang.Tenant;
import org.onap.policy.aai.AaiCqResponse;
import org.onap.policy.common.endpoints.http.client.HttpClientFactoryInstance;
import org.onap.policy.common.utils.coder.Coder;
import org.onap.policy.common.utils.coder.CoderException;
import org.onap.policy.common.utils.coder.StandardCoder;
import org.onap.policy.controlloop.actorserviceprovider.OperationOutcome;
import org.onap.policy.controlloop.actorserviceprovider.parameters.ControlLoopOperationParams;
import org.onap.policy.controlloop.actorserviceprovider.parameters.HttpConfig;
import org.onap.policy.controlloop.policy.PolicyResult;
import org.onap.policy.so.SoRequest;
import org.onap.policy.so.SoResponse;

public class VfModuleDeleteTest extends BasicSoOperation {
    private static final String EXPECTED_EXCEPTION = "expected exception";
    private static final String MODEL_NAME2 = "my-model-name-B";
    private static final String MODEL_VERS2 = "my-model-version-B";
    private static final String SVC_INSTANCE_ID = "my-service-instance-id";
    private static final String VNF_ID = "my-vnf-id";

    @Mock
    private java.net.http.HttpClient javaClient;
    @Mock
    private HttpResponse<String> javaResp;
    @Mock
    private InvocationCallback<Response> callback;

    private CompletableFuture<HttpResponse<String>> javaFuture;
    private VfModuleDelete oper;

    public VfModuleDeleteTest() {
        super(DEFAULT_ACTOR, VfModuleDelete.NAME);
    }

    @BeforeClass
    public static void setUpBeforeClass() throws Exception {
        initBeforeClass();
    }

    @AfterClass
    public static void tearDownAfterClass() {
        destroyAfterClass();
    }

    /**
     * Sets up.
     */
    @Before
    public void setUp() throws Exception {
        super.setUp();

        initHostPort();

        configureResponse(coder.encode(response));

        oper = new MyOperation(params, config);
    }

    /**
     * Tests "success" case with simulator.
     */
    @Test
    public void testSuccess() throws Exception {
        SoParams opParams = SoParams.builder().clientName(MY_CLIENT).path("serviceInstances/v7")
                        .pathGet("orchestrationRequests/v5/").maxGets(2).build();
        config = new SoConfig(blockingExecutor, opParams, HttpClientFactoryInstance.getClientFactory());

        params = params.toBuilder().retry(0).timeoutSec(5).executor(blockingExecutor).build();
        oper = new VfModuleDelete(params, config);

        outcome = oper.start().get();
        assertEquals(PolicyResult.SUCCESS, outcome.getResult());
        assertTrue(outcome.getResponse() instanceof SoResponse);
    }

    @Test
    public void testConstructor() {
        assertEquals(DEFAULT_ACTOR, oper.getActorName());
        assertEquals(VfModuleDelete.NAME, oper.getName());

        // verify that target validation is done
        params = params.toBuilder().target(null).build();
        assertThatIllegalArgumentException().isThrownBy(() -> new VfModuleDelete(params, config))
                        .withMessageContaining("Target information");
    }

    @Test
    public void testStartPreprocessorAsync() throws Exception {
        // insert CQ data so it's there for the check
        context.setProperty(AaiCqResponse.CONTEXT_KEY, makeCqResponse());

        AtomicBoolean guardStarted = new AtomicBoolean();

        oper = new MyOperation(params, config) {
            @Override
            protected CompletableFuture<OperationOutcome> startGuardAsync() {
                guardStarted.set(true);
                return super.startGuardAsync();
            }
        };

        CompletableFuture<OperationOutcome> future3 = oper.startPreprocessorAsync();
        assertNotNull(future3);
        assertTrue(guardStarted.get());
    }

    @Test
    public void testStartGuardAsync() throws Exception {
        // remove CQ data so it's forced to query
        context.removeProperty(AaiCqResponse.CONTEXT_KEY);

        CompletableFuture<OperationOutcome> future2 = oper.startPreprocessorAsync();
        assertTrue(executor.runAll(100));
        assertFalse(future2.isDone());

        provideCqResponse(makeCqResponse());
        assertTrue(executor.runAll(100));
        assertTrue(future2.isDone());
        assertEquals(PolicyResult.SUCCESS, future2.get().getResult());
    }

    @Test
    public void testMakeGuardPayload() {
        final int origCount = 30;
        oper.setVfCount(origCount);

        CompletableFuture<OperationOutcome> future2 = oper.startPreprocessorAsync();
        assertTrue(executor.runAll(100));
        assertTrue(future2.isDone());

        // get the payload from the request
        ArgumentCaptor<ControlLoopOperationParams> captor = ArgumentCaptor.forClass(ControlLoopOperationParams.class);
        verify(guardOperator).buildOperation(captor.capture());

        Map<String, Object> payload = captor.getValue().getPayload();
        assertNotNull(payload);

        Integer newCount = (Integer) payload.get(VfModuleDelete.PAYLOAD_KEY_VF_COUNT);
        assertNotNull(newCount);
        assertEquals(origCount - 1, newCount.intValue());
    }

    @Test
    public void testStartOperationAsync_testSuccessfulCompletion() throws Exception {
        final int origCount = 30;
        oper.setVfCount(origCount);

        // use a real executor
        params = params.toBuilder().executor(ForkJoinPool.commonPool()).build();

        oper = new MyOperation(params, config) {
            @Override
            public long getWaitMsGet() {
                return 1;
            }
        };

        CompletableFuture<OperationOutcome> future2 = oper.start();

        outcome = future2.get(5, TimeUnit.SECONDS);
        assertEquals(PolicyResult.SUCCESS, outcome.getResult());

        SoResponse resp = outcome.getResponse();
        assertNotNull(resp);
        assertEquals(REQ_ID.toString(), resp.getRequestReferences().getRequestId());

        assertEquals(origCount - 1, oper.getVfCount());
    }

    /**
     * Tests startOperationAsync() when "get" operations are required.
     */
    @Test
    public void testStartOperationAsyncWithGets() throws Exception {

        // indicate that the response was incomplete
        configureResponse(coder.encode(response).replace("COMPLETE", "incomplete"));

        when(rawResponse.getStatus()).thenReturn(500, 500, 500, 200, 200);
        when(client.get(any(), any(), any())).thenAnswer(provideResponse(rawResponse));

        // use a real executor
        params = params.toBuilder().executor(ForkJoinPool.commonPool()).build();

        oper = new MyOperation(params, config) {
            @Override
            public long getWaitMsGet() {
                return 1;
            }
        };

        CompletableFuture<OperationOutcome> future2 = oper.start();

        outcome = future2.get(5, TimeUnit.SECONDS);
        assertEquals(PolicyResult.SUCCESS, outcome.getResult());
    }

    @Test
    public void testMakeRequest() throws CoderException {
        Pair<String, SoRequest> pair = oper.makeRequest();

        assertEquals("/my-service-instance-id/vnfs/my-vnf-id/vfModules/null", pair.getLeft());

        verifyRequest("VfModuleDelete.json", pair.getRight());
    }

    @Test
    public void testDelete() throws Exception {
        SoRequest req = new SoRequest();
        req.setRequestId(REQ_ID);

        Map<String, Object> headers = Map.of("key-A", "value-A");

        final CompletableFuture<Response> delFuture =
                        oper.delete("my-uri", headers, MediaType.APPLICATION_JSON, req, callback);

        ArgumentCaptor<HttpRequest> reqCaptor = ArgumentCaptor.forClass(HttpRequest.class);
        verify(javaClient).sendAsync(reqCaptor.capture(), any());

        HttpRequest req2 = reqCaptor.getValue();
        assertEquals("http://my-host:6969/my-uri", req2.uri().toString());
        assertEquals("DELETE", req2.method());

        HttpHeaders headers2 = req2.headers();
        assertEquals("value-A", headers2.firstValue("key-A").orElse("missing-key"));
        assertEquals(MediaType.APPLICATION_JSON, headers2.firstValue("Content-type").orElse("missing-key"));

        assertTrue(delFuture.isDone());
        Response resp = delFuture.get();

        verify(callback).completed(resp);

        assertEquals(200, resp.getStatus());

        SoResponse resp2 = resp.readEntity(SoResponse.class);
        assertEquals(SoOperation.COMPLETE, resp2.getRequest().getRequestStatus().getRequestState());
    }

    /**
     * Tests delete() when an exception is thrown in the future.
     */
    @Test
    @SuppressWarnings("unchecked")
    public void testDeleteException() throws Exception {
        Throwable thrown = new IllegalStateException(EXPECTED_EXCEPTION);

        // need a new future, with an exception
        javaFuture = CompletableFuture.failedFuture(thrown);
        when(javaClient.sendAsync(any(), any(BodyHandlers.ofString().getClass()))).thenReturn(javaFuture);

        SoRequest req = new SoRequest();
        req.setRequestId(REQ_ID);

        CompletableFuture<Response> delFuture =
                        oper.delete("/my-uri", Map.of(), MediaType.APPLICATION_JSON, req, callback);

        assertTrue(delFuture.isCompletedExceptionally());

        ArgumentCaptor<Throwable> thrownCaptor = ArgumentCaptor.forClass(Throwable.class);
        verify(callback).failed(thrownCaptor.capture());
        assertSame(thrown, thrownCaptor.getValue().getCause());
    }

    @Test
    public void testEncodeBody() {
        // try when request is already a string
        assertEquals("hello", oper.encodeRequest("hello"));

        // try with a real request
        SoRequest req = new SoRequest();
        req.setRequestId(REQ_ID);
        assertEquals("{\"requestId\":\"" + REQ_ID.toString() + "\"}", oper.encodeRequest(req));

        // coder throws an exception
        oper = new MyOperation(params, config) {
            @Override
            protected Coder makeCoder() {
                return new StandardCoder() {
                    @Override
                    public String encode(Object object) throws CoderException {
                        throw new CoderException(EXPECTED_EXCEPTION);
                    }
                };
            }
        };

        assertThatIllegalArgumentException().isThrownBy(() -> oper.encodeRequest(req))
                        .withMessage("cannot encode request");
    }

    /**
     * Tests addAuthHeader() when there is a username, but no password.
     */
    @Test
    public void testAddAuthHeader() {
        Builder builder = mock(Builder.class);
        when(client.getUserName()).thenReturn("the-user");
        when(client.getPassword()).thenReturn("the-password");
        oper.addAuthHeader(builder);

        ArgumentCaptor<String> keyCaptor = ArgumentCaptor.forClass(String.class);
        ArgumentCaptor<String> valueCaptor = ArgumentCaptor.forClass(String.class);

        verify(builder).header(keyCaptor.capture(), valueCaptor.capture());

        assertEquals("Authorization", keyCaptor.getValue());

        String encoded = Base64.getEncoder().encodeToString("the-user:the-password".getBytes(StandardCharsets.UTF_8));
        assertEquals("Basic " + encoded, valueCaptor.getValue());
    }

    /**
     * Tests addAuthHeader() when there is no username.
     */
    @Test
    public void testAddAuthHeaderNoUser() {
        Builder builder = mock(Builder.class);
        when(client.getPassword()).thenReturn("world");
        oper.addAuthHeader(builder);
        verify(builder, never()).header(any(), any());

        // repeat with empty username
        when(client.getUserName()).thenReturn("");
        oper.addAuthHeader(builder);
        verify(builder, never()).header(any(), any());
    }

    /**
     * Tests addAuthHeader() when there is a username, but no password.
     */
    @Test
    public void testAddAuthHeaderUserOnly() {
        Builder builder = mock(Builder.class);
        when(client.getUserName()).thenReturn("my-user");
        oper.addAuthHeader(builder);

        ArgumentCaptor<String> keyCaptor = ArgumentCaptor.forClass(String.class);
        ArgumentCaptor<String> valueCaptor = ArgumentCaptor.forClass(String.class);

        verify(builder).header(keyCaptor.capture(), valueCaptor.capture());

        assertEquals("Authorization", keyCaptor.getValue());

        String encoded = Base64.getEncoder().encodeToString("my-user:".getBytes(StandardCharsets.UTF_8));
        assertEquals("Basic " + encoded, valueCaptor.getValue());
    }

    @Test
    public void testMakeHttpClient() {
        // must use a real operation to invoke this method
        assertNotNull(new VfModuleDelete(params, config).makeHttpClient());
    }


    @Override
    protected void makeContext() {
        super.makeContext();

        AaiCqResponse cq = mock(AaiCqResponse.class);

        GenericVnf vnf = new GenericVnf();
        when(cq.getGenericVnfByVfModuleModelInvariantId(MODEL_INVAR_ID)).thenReturn(vnf);
        vnf.setVnfId(VNF_ID);

        ServiceInstance instance = new ServiceInstance();
        when(cq.getServiceInstance()).thenReturn(instance);
        instance.setServiceInstanceId(SVC_INSTANCE_ID);

        when(cq.getDefaultTenant()).thenReturn(new Tenant());
        when(cq.getDefaultCloudRegion()).thenReturn(new CloudRegion());

        ModelVer modelVers = new ModelVer();
        when(cq.getModelVerByVersionId(any())).thenReturn(modelVers);
        modelVers.setModelName(MODEL_NAME2);
        modelVers.setModelVersion(MODEL_VERS2);

        params.getContext().setProperty(AaiCqResponse.CONTEXT_KEY, cq);
    }

    private void initHostPort() {
        when(client.getBaseUrl()).thenReturn("http://my-host:6969/");
    }

    @SuppressWarnings("unchecked")
    private void configureResponse(String responseText) throws CoderException {
        // indicate that the response was completed
        when(javaResp.statusCode()).thenReturn(200);
        when(javaResp.body()).thenReturn(responseText);

        javaFuture = CompletableFuture.completedFuture(javaResp);
        when(javaClient.sendAsync(any(), any(BodyHandlers.ofString().getClass()))).thenReturn(javaFuture);
    }

    private class MyOperation extends VfModuleDelete {

        public MyOperation(ControlLoopOperationParams params, HttpConfig config) {
            super(params, config);
        }

        @Override
        protected java.net.http.HttpClient makeHttpClient() {
            return javaClient;
        }
    }
}