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package io.split.client.impressions;

import com.google.common.annotations.VisibleForTesting;
import io.split.client.SplitClientConfig;
import io.split.client.dtos.KeyImpression;
import io.split.client.dtos.TestImpressions;
import io.split.client.impressions.strategy.ProcessImpressionStrategy;
import io.split.client.utils.SplitExecutorFactory;
import io.split.telemetry.domain.enums.ImpressionsDataTypeEnum;
import io.split.telemetry.storage.TelemetryRuntimeProducer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.Closeable;
import java.net.URISyntaxException;
import java.util.List;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

import static com.google.common.base.Preconditions.checkNotNull;

/**
 * Created by patricioe on 6/17/16.
 */
public class ImpressionsManagerImpl implements ImpressionsManager, Closeable {

    private static final Logger _log = LoggerFactory.getLogger(ImpressionsManagerImpl.class);

    private static final long BULK_INITIAL_DELAY_SECONDS = 10L;
    private static final long COUNT_INITIAL_DELAY_SECONDS = 100L;
    private static final long COUNT_REFRESH_RATE_SECONDS = 30 * 60;
    private final SplitClientConfig _config;
    private final ImpressionsStorageProducer _impressionsStorageProducer;
    private final ImpressionsStorageConsumer _impressionsStorageConsumer;
    private final ScheduledExecutorService _scheduler;
    private final ImpressionsSender _impressionsSender;
    private final ImpressionListener _listener;
    private final ImpressionsManager.Mode _impressionsMode;
    private TelemetryRuntimeProducer _telemetryRuntimeProducer;
    private ImpressionCounter _counter;
    private ProcessImpressionStrategy _processImpressionStrategy;
    private final int _impressionsRefreshRate;

    public static ImpressionsManagerImpl instance(SplitClientConfig config,
                                                  TelemetryRuntimeProducer telemetryRuntimeProducer,
                                                  ImpressionsStorageConsumer impressionsStorageConsumer,
                                                  ImpressionsStorageProducer impressionsStorageProducer,
                                                  ImpressionsSender impressionsSender,
                                                  ProcessImpressionStrategy processImpressionStrategy,
                                                  ImpressionCounter counter,
                                                  ImpressionListener listener) throws URISyntaxException {
        return new ImpressionsManagerImpl(config, impressionsSender, telemetryRuntimeProducer, impressionsStorageConsumer,
                impressionsStorageProducer, processImpressionStrategy, counter, listener);
    }

    public static ImpressionsManagerImpl instanceForTest(SplitClientConfig config,
                                                         ImpressionsSender impressionsSender,
                                                         TelemetryRuntimeProducer telemetryRuntimeProducer,
                                                         ImpressionsStorageConsumer impressionsStorageConsumer,
                                                         ImpressionsStorageProducer impressionsStorageProducer,
                                                         ProcessImpressionStrategy processImpressionStrategy,
                                                         ImpressionCounter counter,
                                                         ImpressionListener listener) {
        return new ImpressionsManagerImpl(config, impressionsSender, telemetryRuntimeProducer, impressionsStorageConsumer,
                impressionsStorageProducer, processImpressionStrategy, counter, listener);
    }

    private ImpressionsManagerImpl(SplitClientConfig config,
                                   ImpressionsSender impressionsSender,
                                   TelemetryRuntimeProducer telemetryRuntimeProducer,
                                   ImpressionsStorageConsumer impressionsStorageConsumer,
                                   ImpressionsStorageProducer impressionsStorageProducer,
                                   ProcessImpressionStrategy processImpressionStrategy,
                                   ImpressionCounter impressionCounter,
                                   ImpressionListener impressionListener) {


        _config = checkNotNull(config);
        _impressionsMode = checkNotNull(config.impressionsMode());
        _impressionsStorageConsumer = checkNotNull(impressionsStorageConsumer);
        _impressionsStorageProducer = checkNotNull(impressionsStorageProducer);
        _telemetryRuntimeProducer = checkNotNull(telemetryRuntimeProducer);
        _processImpressionStrategy = checkNotNull(processImpressionStrategy);
        _impressionsSender = impressionsSender;
        _counter = impressionCounter;

        _scheduler = SplitExecutorFactory.buildScheduledExecutorService(config.getThreadFactory(), "Split-ImpressionsManager-%d", 2);
        _listener = impressionListener;

        _impressionsRefreshRate = config.impressionsRefreshRate();
    }

    @Override
    public void start(){
        switch (_impressionsMode){
            case OPTIMIZED:
                _scheduler.scheduleAtFixedRate(this::sendImpressionCounters, COUNT_INITIAL_DELAY_SECONDS, COUNT_REFRESH_RATE_SECONDS,
                        TimeUnit.SECONDS);
                _scheduler.scheduleAtFixedRate(this::sendImpressions, BULK_INITIAL_DELAY_SECONDS, _impressionsRefreshRate, TimeUnit.SECONDS);
                break;
            case DEBUG:
                _scheduler.scheduleAtFixedRate(this::sendImpressions, BULK_INITIAL_DELAY_SECONDS, _impressionsRefreshRate, TimeUnit.SECONDS);
                break;
            case NONE:
                _scheduler.scheduleAtFixedRate(this::sendImpressionCounters, COUNT_INITIAL_DELAY_SECONDS, COUNT_REFRESH_RATE_SECONDS,
                        TimeUnit.SECONDS);
                break;
        }
    }

    @Override
    public void track(List impressions) {
        if (null == impressions) {
            return;
        }

        ImpressionsResult impressionsResult = _processImpressionStrategy.process(impressions);
        List impressionsForLogs = impressionsResult.getImpressionsToQueue();
        List impressionsToListener = impressionsResult.getImpressionsToListener();

        int totalImpressions = impressionsForLogs.size();
        long queued = _impressionsStorageProducer.put(impressionsForLogs.stream().map(KeyImpression::fromImpression).collect(Collectors.toList()));
        if (queued < totalImpressions) {
            _telemetryRuntimeProducer.recordImpressionStats(ImpressionsDataTypeEnum.IMPRESSIONS_DROPPED, totalImpressions-queued);
        }
        _telemetryRuntimeProducer.recordImpressionStats(ImpressionsDataTypeEnum.IMPRESSIONS_QUEUED, queued);

        if (_listener!=null){
            impressionsToListener.forEach(imp -> _listener.log(imp));
        }
    }

    @Override
    public void close() {
        try {
            if(_listener!= null){
                _listener.close();
                _log.info("Successful shutdown of ImpressionListener");
            }
            _scheduler.shutdown();
            sendImpressions();
            if(_counter != null) {
                sendImpressionCounters();
            }
        } catch (Exception e) {
            _log.warn("Unable to close ImpressionsManager properly", e);
        }

    }

    @VisibleForTesting
    /* package private */ void sendImpressions() {
        if (_impressionsStorageConsumer.isFull()) {
            _log.warn("Split SDK impressions queue is full. Impressions may have been dropped. Consider increasing capacity.");
        }

        long start = System.currentTimeMillis();
        List impressions = _impressionsStorageConsumer.pop();
        if (impressions.isEmpty()) {
            return; // Nothing to send
        }

        _impressionsSender.postImpressionsBulk(TestImpressions.fromKeyImpressions(impressions));
        if (_config.debugEnabled()) {
            _log.info(String.format("Posting %d Split impressions took %d millis",
                    impressions.size(), (System.currentTimeMillis() - start)));
        }
    }

    @VisibleForTesting
        /* package private */ void sendImpressionCounters() {
        if (!_counter.isEmpty()) {
            _impressionsSender.postCounters(_counter.popAll());
        }
    }

    @VisibleForTesting
    /* package private */ ImpressionCounter getCounter() {
        return _counter;
    }
}