package cc.fascinated.bat.service;

import cc.fascinated.bat.model.BatUser;
import cc.fascinated.bat.repository.UserRepository;
import lombok.Getter;
import lombok.NonNull;
import lombok.extern.log4j.Log4j2;
import net.jodah.expiringmap.ExpiringMap;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.DependsOn;
import org.springframework.stereotype.Service;

import java.util.Map;
import java.util.Optional;
import java.util.concurrent.TimeUnit;

/**
 * @author Fascinated (fascinated7)
 */
@Service
@Log4j2
@Getter
@DependsOn("discordService")
public class UserService {
    /**
     * The cached users
     */
    private final Map<String, BatUser> users = ExpiringMap.builder()
            .expiration(6, TimeUnit.HOURS)
            .build();

    /**
     * The user repository to use
     */
    private final UserRepository userRepository;

    @Autowired
    public UserService(@NonNull UserRepository userRepository) {
        this.userRepository = userRepository;
    }

    /**
     * Gets a user by their ID
     *
     * @param id The ID of the user
     * @return The user
     */
    public BatUser getUser(@NonNull String id) {
        if (users.containsKey(id)) {
            return users.get(id);
        }

        long start = System.currentTimeMillis();
        Optional<BatUser> optionalUser = userRepository.findById(id);
        if (optionalUser.isPresent()) {
            BatUser user = optionalUser.get();
            users.put(id, user);
            return user;
        }
        BatUser user = userRepository.save(new BatUser(id));
        log.info("Created user for \"{}\" in {}ms", user.getDiscordUser().getName(), System.currentTimeMillis() - start);
        return user;
    }

    /**
     * Saves a user
     *
     * @param user The user to save
     */
    public void saveUser(@NonNull BatUser user) {
        userRepository.save(user);
    }
}