package geode.kafka.source;

import geode.kafka.GeodeContext;
import org.apache.geode.cache.client.ClientCache;
import org.apache.geode.cache.query.CqEvent;
import org.junit.Test;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;

import static geode.kafka.source.GeodeSourceConnectorConfig.DEFAULT_CQ_PREFIX;
import static org.apache.geode.pdx.internal.PeerTypeRegistration.REGION_NAME;
import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertThat;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.ArgumentMatchers.anyBoolean;
import static org.mockito.ArgumentMatchers.anyString;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;


public class GeodeKafkaSourceTaskTest {


    @Test
    public void whenLoadingEntireRegionAbleToPutInitialResultsIntoEventBuffer() {
        GeodeContext geodeContext = mock(GeodeContext.class);
        BlockingQueue<GeodeEvent> eventBuffer = new LinkedBlockingQueue(100);
        boolean loadEntireRegion = true;
        boolean isDurable = false;
        List<CqEvent> fakeInitialResults = new LinkedList<>();
        for (int i = 0; i < 10; i++) {
            fakeInitialResults.add(mock(CqEvent.class));
        }

        when(geodeContext.newCqWithInitialResults(anyString(), anyString(), any(), anyBoolean())).thenReturn(fakeInitialResults);
        GeodeKafkaSourceTask task = new GeodeKafkaSourceTask();
        task.installListenersToRegion(geodeContext, 1, eventBuffer, "testRegion", DEFAULT_CQ_PREFIX, loadEntireRegion, isDurable);
        assertEquals(10, eventBuffer.size());
    }

    @Test
    public void whenNotLoadingEntireRegionShouldNotPutInitialResultsIntoEventBuffer() {
        GeodeContext geodeContext = mock(GeodeContext.class);
        BlockingQueue<GeodeEvent> eventBuffer = new LinkedBlockingQueue(100);
        boolean loadEntireRegion = false;
        boolean isDurable = false;
        List<CqEvent> fakeInitialResults = new LinkedList<>();
        for (int i = 0; i < 10; i++) {
            fakeInitialResults.add(mock(CqEvent.class));
        }

        when(geodeContext.newCqWithInitialResults(anyString(), anyString(), any(), anyBoolean())).thenReturn(fakeInitialResults);
        GeodeKafkaSourceTask task = new GeodeKafkaSourceTask();
        task.installListenersToRegion(geodeContext, 1, eventBuffer, "testRegion", DEFAULT_CQ_PREFIX, loadEntireRegion, isDurable);
        assertEquals(0, eventBuffer.size());
    }

    @Test
    public void cqListenerOnEventPopulatesEventsBuffer() {
        GeodeContext geodeContext = mock(GeodeContext.class);
        BlockingQueue<GeodeEvent> eventBuffer = new LinkedBlockingQueue(100);
        boolean loadEntireRegion = false;
        boolean isDurable = false;

        when(geodeContext.newCqWithInitialResults(anyString(), anyString(), any(), anyBoolean())).thenReturn(new ArrayList());
        GeodeKafkaSourceTask task = new GeodeKafkaSourceTask();
        GeodeKafkaSourceListener listener = task.installListenersToRegion(geodeContext, 1, eventBuffer, "testRegion", DEFAULT_CQ_PREFIX, loadEntireRegion, isDurable);

        listener.onEvent(mock(CqEvent.class));
        assertEquals(1, eventBuffer.size());
    }

    @Test
    public void readyForEventsIsCalledIfDurable() {
        ClientCache clientCache = mock(ClientCache.class);

        GeodeContext geodeContext = mock(GeodeContext.class);
        when(geodeContext.getClientCache()).thenReturn(clientCache);

        GeodeSourceConnectorConfig config = mock(GeodeSourceConnectorConfig.class);
        when (config.isDurable()).thenReturn(true);
        GeodeKafkaSourceTask task = new GeodeKafkaSourceTask();
        task.installOnGeode(config, geodeContext, null, "", false);
        verify(clientCache, times(1)).readyForEvents();
    }

    @Test
    public void cqIsInvokedForEveryRegionWithATopic() {
        ClientCache clientCache = mock(ClientCache.class);

        GeodeContext geodeContext = mock(GeodeContext.class);
        when(geodeContext.getClientCache()).thenReturn(clientCache);

        Map<String, List<String>> regionToTopicsMap = new HashMap<>();
        regionToTopicsMap.put("region1", new ArrayList());

        GeodeSourceConnectorConfig config = mock(GeodeSourceConnectorConfig.class);
        when (config.getRegionToTopics()).thenReturn(regionToTopicsMap);

        GeodeKafkaSourceTask task = new GeodeKafkaSourceTask();
        task.installOnGeode(config, geodeContext, null, "someCqPrefix", false);
        verify(geodeContext, times(1)).newCq(anyString(), anyString(), any(), anyBoolean());
    }

    @Test
    public void cqWithInitialResultsIsInvokedForEveryRegionWithATopicIfLoadEntireIsSet() {
        ClientCache clientCache = mock(ClientCache.class);

        GeodeContext geodeContext = mock(GeodeContext.class);
        when(geodeContext.getClientCache()).thenReturn(clientCache);

        Map<String, List<String>> regionToTopicsMap = new HashMap<>();
        regionToTopicsMap.put("region1", new ArrayList());

        GeodeSourceConnectorConfig config = mock(GeodeSourceConnectorConfig.class);
        when (config.getRegionToTopics()).thenReturn(regionToTopicsMap);

        GeodeKafkaSourceTask task = new GeodeKafkaSourceTask();
        task.installOnGeode(config, geodeContext, new LinkedBlockingQueue(), "someCqPrefix", true);
        verify(geodeContext, times(1)).newCqWithInitialResults(anyString(), anyString(), any(), anyBoolean());
    }

    @Test
    public void readyForEventsIsNotCalledIfNotDurable() {
        ClientCache clientCache = mock(ClientCache.class);

        GeodeContext geodeContext = mock(GeodeContext.class);
        when(geodeContext.getClientCache()).thenReturn(clientCache);

        GeodeSourceConnectorConfig config = mock(GeodeSourceConnectorConfig.class);
        when (config.isDurable()).thenReturn(false);
        GeodeKafkaSourceTask task = new GeodeKafkaSourceTask();
        task.installOnGeode(config, geodeContext, null, "", false);
        verify(clientCache, times(0)).readyForEvents();
    }

    @Test
    public void pollReturnsEventsWhenEventBufferHasValues() throws Exception {
//        BlockingQueue<GeodeEvent> eventBuffer = new LinkedBlockingQueue(100);
//        CqEvent cqEvent = mock(CqEvent.class);
//        when(cqEvent.getNewValue()).thenReturn("New Value");
//        GeodeEvent event = mock(GeodeEvent.class);
//        when(event.getEvent()).thenReturn(cqEvent);
//        eventBuffer.add(event);
//
//        List<String> topics = new ArrayList<>();
//        topics.add("myTopic");
//
//        GeodeKafkaSourceTask task = new GeodeKafkaSourceTask();
//        task.startForTesting(eventBuffer, topics, 1);
//        List<SourceRecord> records = task.poll();
//        assertEquals(1, records.size());
    }

    @Test
    public void installOnGeodeShouldCallCq() {
        GeodeKafkaSourceTask task = new GeodeKafkaSourceTask();
    }


    @Test
    public void createSourcePartitionsShouldReturnAMapOfSourcePartitions() {
        GeodeKafkaSourceTask task = new GeodeKafkaSourceTask();
        List<String> regionNames = Arrays.asList(new String[]{"region1", "region2", "region3"});
        Map<String, Map<String,String>> sourcePartitions = task.createSourcePartitionsMap(regionNames);
        assertThat(3, is(sourcePartitions.size()));
        assertThat(true, is(sourcePartitions.get("region1").get(REGION_NAME).equals("region1")));
        assertThat(true, is(sourcePartitions.get("region2").get(REGION_NAME).equals("region2")));
        assertThat(true, is(sourcePartitions.get("region3").get(REGION_NAME).equals("region3")));
    }

    @Test
    public void listOfLocatorsShouldBeConfiguredIntoClientCache() {

    }

    @Test
    public void shouldNotBeDurableIfDurableClientIdIsNull() {

    }

    @Test
    public void shouldNotCallReadyForEventsIfDurableClientPrefixIsEmpty() {

    }


    @Test
    public void cqPrefixShouldBeProperlyCalculatedFromProps() {
//        GeodeContext geodeContext = mock(GeodeContext.class);
//        GeodeKafkaSourceTask task = new GeodeKafkaSourceTask();
    }

}