package com.juick.components;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.android.gcm.server.*;
import com.juick.ExternalToken;
import com.juick.User;
import com.juick.service.component.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;

import javax.annotation.PostConstruct;
import javax.inject.Inject;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

public class FirebaseManager implements NotificationListener {
    private static Logger logger = LoggerFactory.getLogger(FirebaseManager.class);
    @Inject
    ObjectMapper jsonMapper;
    @Value("${gcm_key:}")
    private String gcmKey;
    @Inject
    private NotificationsManager notificationsManager;

    private Sender GCMSender;

    @PostConstruct
    public void initialize() {
        GCMSender = new Sender(gcmKey, Endpoint.GCM);
    }

    @Override
    public void processMessageEvent(MessageEvent messageEvent) {
        com.juick.Message jmsg = messageEvent.getMessage();
        List<User> users = messageEvent.getUsers();
        // GCM
        List<String> regids = users.stream().flatMap(u -> u.getTokens().stream()).filter(d -> d.getType().equals("gcm"))
                .map(ExternalToken::getToken).collect(Collectors.toList());
        if (!regids.isEmpty()) {
            try {
                String json = jsonMapper.writeValueAsString(jmsg);
                logger.info(json);
                Message message = new Message.Builder().addData("message", json).build();
                MulticastResult result = GCMSender.send(message, regids, 3);
                List<Result> results = result.getResults();
                for (int i = 0; i < results.size(); i++) {
                    Result currentResult = results.get(i);
                    logger.info("RES {}: {}", i, currentResult);
                    List<String> errorCodes = Arrays.asList(Constants.ERROR_MISMATCH_SENDER_ID, Constants.ERROR_NOT_REGISTERED);
                    if (errorCodes.contains(currentResult.getErrorCodeName())) {
                        // assuming results are in order of regids
                        // http://stackoverflow.com/a/11594531/1097384
                        String currentId = regids.get(i);
                        logger.info("{} is scheduled to remove", currentId);
                        notificationsManager.addInvalidGCMToken(currentId);
                    }
                }
            } catch (IOException ex) {
                logger.error(ex.getMessage(), ex);
            } catch (IllegalArgumentException err) {
                logger.warn("Android: Invalid API Key", err);
            }
        } else {
            logger.info("GMS: no recipients");
        }
    }

    @Override
    public void processSubscribeEvent(SubscribeEvent subscribeEvent) {

    }

    @Override
    public void processLikeEvent(LikeEvent likeEvent) {

    }

    @Override
    public void processPingEvent(PingEvent pingEvent) {

    }

    @Override
    public void processMessageReadEvent(MessageReadEvent messageReadEvent) {

    }
}