package ru.ulstu.ping.service;

import com.google.common.collect.ImmutableMap;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Service;
import ru.ulstu.core.model.UserActivity;
import ru.ulstu.ping.model.Ping;
import ru.ulstu.ping.model.PingInfo;
import ru.ulstu.ping.repository.PingRepository;
import ru.ulstu.user.model.User;
import ru.ulstu.user.service.MailService;

import java.time.LocalDate;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;

@Service
public class PingScheduler {
    private final Logger log = LoggerFactory.getLogger(PingScheduler.class);
    private final PingRepository pingRepository;
    private final MailService mailService;
    private final static String PING_MAIL_SUBJECT = "Ping статистика";

    public PingScheduler(PingRepository pingRepository, MailService mailService) {
        this.pingRepository = pingRepository;
        this.mailService = mailService;
    }


    @Scheduled(cron = "0 0 * * 1 ?")
    public void sendPingsInfo() {
        log.debug("Scheduler.sendPingsInfo started");

        List<PingInfo> pingInfos = new ArrayList<>();

        for (Ping ping : pingRepository.findByDate(java.sql.Date.valueOf(LocalDate.now().minusWeeks(1)))) {
            UserActivity pingActivity = ping.getActivity();
            Set<User> users = pingActivity.getActivityUsers();

            for (User user : users) {
                PingInfo userPing = pingInfos.stream().filter(u -> u.getUser() == user).findFirst().orElse(null);
                if (userPing == null) {
                    userPing = new PingInfo(user);
                    pingInfos.add(userPing);
                }
                userPing.addPing(ping);
            }
        }

        for (PingInfo pingInfo : pingInfos) {
            mailService.sendEmailFromTemplate(ImmutableMap.of("pings", pingInfo.getPings()),
                    pingInfo.getUser(),  "pingsInfoWeekEmail", PING_MAIL_SUBJECT);
        }
    }
}