/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */
package org.apache.nifi.processors.websocket;

import org.apache.nifi.controller.ControllerService;
import org.apache.nifi.provenance.ProvenanceEventRecord;
import org.apache.nifi.util.MockFlowFile;
import org.apache.nifi.util.TestRunner;
import org.apache.nifi.util.TestRunners;
import org.apache.nifi.websocket.AbstractWebSocketSession;
import org.apache.nifi.websocket.SendMessage;
import org.apache.nifi.websocket.WebSocketMessage;
import org.apache.nifi.websocket.WebSocketService;
import org.apache.nifi.websocket.WebSocketSession;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.Arguments;
import org.junit.jupiter.params.provider.MethodSource;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Stream;

import static org.apache.nifi.processors.websocket.WebSocketProcessorAttributes.ATTR_WS_CS_ID;
import static org.apache.nifi.processors.websocket.WebSocketProcessorAttributes.ATTR_WS_ENDPOINT_ID;
import static org.apache.nifi.processors.websocket.WebSocketProcessorAttributes.ATTR_WS_FAILURE_DETAIL;
import static org.apache.nifi.processors.websocket.WebSocketProcessorAttributes.ATTR_WS_LOCAL_ADDRESS;
import static org.apache.nifi.processors.websocket.WebSocketProcessorAttributes.ATTR_WS_MESSAGE_TYPE;
import static org.apache.nifi.processors.websocket.WebSocketProcessorAttributes.ATTR_WS_REMOTE_ADDRESS;
import static org.apache.nifi.processors.websocket.WebSocketProcessorAttributes.ATTR_WS_SESSION_ID;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.ArgumentMatchers.anyString;
import static org.mockito.Mockito.doAnswer;
import static org.mockito.Mockito.doThrow;
import static org.mockito.Mockito.spy;
import static org.mockito.Mockito.when;


public class TestPutWebSocket {

    private void assertFlowFile(WebSocketSession webSocketSession, String serviceId, String endpointId, MockFlowFile ff, WebSocketMessage.Type messageType) {
        assertEquals(serviceId, ff.getAttribute(ATTR_WS_CS_ID));
        assertEquals(webSocketSession.getSessionId(), ff.getAttribute(ATTR_WS_SESSION_ID));
        assertEquals(endpointId, ff.getAttribute(ATTR_WS_ENDPOINT_ID));
        assertEquals(webSocketSession.getLocalAddress().toString(), ff.getAttribute(ATTR_WS_LOCAL_ADDRESS));
        assertEquals(webSocketSession.getRemoteAddress().toString(), ff.getAttribute(ATTR_WS_REMOTE_ADDRESS));
        assertEquals(messageType != null ? messageType.name() : null, ff.getAttribute(ATTR_WS_MESSAGE_TYPE));
    }

    private WebSocketSession getWebSocketSession() {
        final WebSocketSession webSocketSession = spy(AbstractWebSocketSession.class);
        when(webSocketSession.getSessionId()).thenReturn("ws-session-id");
        when(webSocketSession.getLocalAddress()).thenReturn(new InetSocketAddress("localhost", 12345));
        when(webSocketSession.getRemoteAddress()).thenReturn(new InetSocketAddress("example.com", 80));
        when(webSocketSession.getTransitUri()).thenReturn("ws://example.com/web-socket");
        return webSocketSession;
    }

    @Test
    public void testSessionIsNotSpecified() throws Exception {
        final TestRunner runner = TestRunners.newTestRunner(PutWebSocket.class);
        final WebSocketService service = spy(WebSocketService.class);

        final String serviceId = "ws-service";
        final String endpointId = "client-1";
        final String textMessageFromServer = "message from server.";
        when(service.getIdentifier()).thenReturn(serviceId);
        runner.addControllerService(serviceId, service);

        runner.enableControllerService(service);

        final Map<String, String> attributes = new HashMap<>();
        attributes.put(ATTR_WS_CS_ID, serviceId);
        attributes.put(ATTR_WS_ENDPOINT_ID, endpointId);
        runner.enqueue(textMessageFromServer, attributes);

        runner.run();

        final List<MockFlowFile> succeededFlowFiles = runner.getFlowFilesForRelationship(PutWebSocket.REL_SUCCESS);
        //assertEquals(0, succeededFlowFiles.size());   //No longer valid test after NIFI-3318 since not specifying sessionid will send to all clients
        assertEquals(1, succeededFlowFiles.size());

        final List<MockFlowFile> failedFlowFiles = runner.getFlowFilesForRelationship(PutWebSocket.REL_FAILURE);
        //assertEquals(1, failedFlowFiles.size());      //No longer valid test after NIFI-3318
        assertEquals(0, failedFlowFiles.size());

        final List<ProvenanceEventRecord> provenanceEvents = runner.getProvenanceEvents();
        assertEquals(0, provenanceEvents.size());

    }

    @Test
    public void testServiceIsNotFound() throws Exception {
        final TestRunner runner = TestRunners.newTestRunner(PutWebSocket.class);
        final ControllerService service = spy(ControllerService.class);

        final WebSocketSession webSocketSession = getWebSocketSession();

        final String serviceId = "ws-service";
        final String endpointId = "client-1";
        final String textMessageFromServer = "message from server.";
        when(service.getIdentifier()).thenReturn(serviceId);
        runner.addControllerService(serviceId, service);

        runner.enableControllerService(service);

        final Map<String, String> attributes = new HashMap<>();
        attributes.put(ATTR_WS_CS_ID, "different-service-id");
        attributes.put(ATTR_WS_ENDPOINT_ID, endpointId);
        attributes.put(ATTR_WS_SESSION_ID, webSocketSession.getSessionId());
        runner.enqueue(textMessageFromServer, attributes);

        runner.run();

        final List<MockFlowFile> succeededFlowFiles = runner.getFlowFilesForRelationship(PutWebSocket.REL_SUCCESS);
        assertEquals(0, succeededFlowFiles.size());

        final List<MockFlowFile> failedFlowFiles = runner.getFlowFilesForRelationship(PutWebSocket.REL_FAILURE);
        assertEquals(1, failedFlowFiles.size());
        final MockFlowFile failedFlowFile = failedFlowFiles.getFirst();
        assertNotNull(failedFlowFile.getAttribute(ATTR_WS_FAILURE_DETAIL));

        final List<ProvenanceEventRecord> provenanceEvents = runner.getProvenanceEvents();
        assertEquals(0, provenanceEvents.size());

    }

    @Test
    public void testServiceIsNotWebSocketService() throws Exception {
        final TestRunner runner = TestRunners.newTestRunner(PutWebSocket.class);
        final ControllerService service = spy(ControllerService.class);

        final WebSocketSession webSocketSession = getWebSocketSession();

        final String serviceId = "ws-service";
        final String endpointId = "client-1";
        final String textMessageFromServer = "message from server.";
        when(service.getIdentifier()).thenReturn(serviceId);
        runner.addControllerService(serviceId, service);

        runner.enableControllerService(service);

        final Map<String, String> attributes = new HashMap<>();
        attributes.put(ATTR_WS_CS_ID, serviceId);
        attributes.put(ATTR_WS_ENDPOINT_ID, endpointId);
        attributes.put(ATTR_WS_SESSION_ID, webSocketSession.getSessionId());
        runner.enqueue(textMessageFromServer, attributes);

        runner.run();

        final List<MockFlowFile> succeededFlowFiles = runner.getFlowFilesForRelationship(PutWebSocket.REL_SUCCESS);
        assertEquals(0, succeededFlowFiles.size());

        final List<MockFlowFile> failedFlowFiles = runner.getFlowFilesForRelationship(PutWebSocket.REL_FAILURE);
        assertEquals(1, failedFlowFiles.size());
        final MockFlowFile failedFlowFile = failedFlowFiles.getFirst();
        assertNotNull(failedFlowFile.getAttribute(ATTR_WS_FAILURE_DETAIL));

        final List<ProvenanceEventRecord> provenanceEvents = runner.getProvenanceEvents();
        assertEquals(0, provenanceEvents.size());

    }

    @Test
    public void testSendFailure() throws Exception {
        final TestRunner runner = TestRunners.newTestRunner(PutWebSocket.class);
        final WebSocketService service = spy(WebSocketService.class);

        final WebSocketSession webSocketSession = getWebSocketSession();

        final String serviceId = "ws-service";
        final String endpointId = "client-1";
        final String textMessageFromServer = "message from server.";
        when(service.getIdentifier()).thenReturn(serviceId);
        doAnswer(invocation -> {
            final SendMessage sendMessage = invocation.getArgument(2);
            sendMessage.send(webSocketSession);
            return null;
        }).when(service).sendMessage(anyString(), anyString(), any(SendMessage.class));
        doThrow(new IOException("Sending message failed.")).when(webSocketSession).sendString(anyString());
        runner.addControllerService(serviceId, service);

        runner.enableControllerService(service);

        final Map<String, String> attributes = new HashMap<>();
        attributes.put(ATTR_WS_CS_ID, serviceId);
        attributes.put(ATTR_WS_ENDPOINT_ID, endpointId);
        attributes.put(ATTR_WS_SESSION_ID, webSocketSession.getSessionId());
        runner.enqueue(textMessageFromServer, attributes);

        runner.run();

        final List<MockFlowFile> succeededFlowFiles = runner.getFlowFilesForRelationship(PutWebSocket.REL_SUCCESS);
        assertEquals(0, succeededFlowFiles.size());

        final List<MockFlowFile> failedFlowFiles = runner.getFlowFilesForRelationship(PutWebSocket.REL_FAILURE);
        assertEquals(1, failedFlowFiles.size());
        final MockFlowFile failedFlowFile = failedFlowFiles.getFirst();
        assertNotNull(failedFlowFile.getAttribute(ATTR_WS_FAILURE_DETAIL));

        final List<ProvenanceEventRecord> provenanceEvents = runner.getProvenanceEvents();
        assertEquals(0, provenanceEvents.size());

    }

    @Test
    public void testSuccess() throws Exception {
        final TestRunner runner = TestRunners.newTestRunner(PutWebSocket.class);
        final WebSocketService service = spy(WebSocketService.class);

        final WebSocketSession webSocketSession = getWebSocketSession();

        final String serviceId = "ws-service";
        final String endpointId = "client-1";
        final String textMessageFromServer = "message from server.";
        when(service.getIdentifier()).thenReturn(serviceId);
        doAnswer(invocation -> {
            final SendMessage sendMessage = invocation.getArgument(2);
            sendMessage.send(webSocketSession);
            return null;
        }).when(service).sendMessage(anyString(), anyString(), any(SendMessage.class));
        runner.addControllerService(serviceId, service);

        runner.enableControllerService(service);

        runner.setProperty(PutWebSocket.PROP_WS_MESSAGE_TYPE, "${" + ATTR_WS_MESSAGE_TYPE + "}");

        // Enqueue 1st file as Text.
        final Map<String, String> attributes = new HashMap<>();
        attributes.put(ATTR_WS_CS_ID, serviceId);
        attributes.put(ATTR_WS_ENDPOINT_ID, endpointId);
        attributes.put(ATTR_WS_SESSION_ID, webSocketSession.getSessionId());
        attributes.put(ATTR_WS_MESSAGE_TYPE, WebSocketMessage.Type.TEXT.name());
        runner.enqueue(textMessageFromServer, attributes);

        // Enqueue 2nd file as Binary.
        attributes.put(ATTR_WS_MESSAGE_TYPE, WebSocketMessage.Type.BINARY.name());
        runner.enqueue(textMessageFromServer.getBytes(), attributes);

        runner.run(2);

        final List<MockFlowFile> succeededFlowFiles = runner.getFlowFilesForRelationship(PutWebSocket.REL_SUCCESS);
        assertEquals(2, succeededFlowFiles.size());
        assertFlowFile(webSocketSession, serviceId, endpointId, succeededFlowFiles.get(0), WebSocketMessage.Type.TEXT);
        assertFlowFile(webSocketSession, serviceId, endpointId, succeededFlowFiles.get(1), WebSocketMessage.Type.BINARY);

        final List<MockFlowFile> failedFlowFiles = runner.getFlowFilesForRelationship(PutWebSocket.REL_FAILURE);
        assertEquals(0, failedFlowFiles.size());

        final List<ProvenanceEventRecord> provenanceEvents = runner.getProvenanceEvents();
        assertEquals(2, provenanceEvents.size());
    }

    @ParameterizedTest
    @MethodSource("webSocketMessageTypeArgs")
    void testWebSocketMessageType(String type, boolean valid) {
        final TestRunner runner = TestRunners.newTestRunner(PutWebSocket.class);
        runner.setProperty(PutWebSocket.PROP_WS_MESSAGE_TYPE, type);

        if (valid) {
            runner.assertValid();
        } else {
            runner.assertNotValid();
        }
    }

    private static Stream<Arguments> webSocketMessageTypeArgs() {
        return Stream.of(
                Arguments.argumentSet("Valid type TEXT", WebSocketMessage.Type.TEXT.name(), true),
                Arguments.argumentSet("Valid type BINARY", WebSocketMessage.Type.BINARY.name(), true),
                Arguments.argumentSet("Invalid type", "INVALID_TYPE", false)
        );
    }
}
