OpenIsle/backend/src/main/java/com/openisle/service/LevelService.java

package com.openisle.service;

import com.openisle.model.ExperienceLog;
import com.openisle.model.User;
import com.openisle.repository.ExperienceLogRepository;
import com.openisle.repository.UserRepository;
import java.time.LocalDate;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;

@Service
@RequiredArgsConstructor
public class LevelService {

  private final UserRepository userRepository;
  // repositories for experience-related entities
  private final ExperienceLogRepository experienceLogRepository;
  private final UserVisitService userVisitService;

  private static final int[] LEVEL_EXP = { 100, 200, 300, 600, 1200, 10000 };

  private ExperienceLog getTodayLog(User user) {
    LocalDate today = LocalDate.now();
    return experienceLogRepository
      .findByUserAndLogDate(user, today)
      .orElseGet(() -> {
        ExperienceLog log = new ExperienceLog();
        log.setUser(user);
        log.setLogDate(today);
        log.setPostCount(0);
        log.setCommentCount(0);
        log.setReactionCount(0);
        return experienceLogRepository.save(log);
      });
  }

  private int addExperience(User user, int amount) {
    user.setExperience(user.getExperience() + amount);
    userRepository.save(user);
    return amount;
  }

  public int awardForPost(String username) {
    User user = userRepository.findByUsername(username).orElseThrow();
    ExperienceLog log = getTodayLog(user);
    if (log.getPostCount() > 1) return 0;
    log.setPostCount(log.getPostCount() + 1);
    experienceLogRepository.save(log);
    return addExperience(user, 30);
  }

  public int awardForComment(String username) {
    User user = userRepository.findByUsername(username).orElseThrow();
    ExperienceLog log = getTodayLog(user);
    if (log.getCommentCount() > 3) return 0;
    log.setCommentCount(log.getCommentCount() + 1);
    experienceLogRepository.save(log);
    return addExperience(user, 10);
  }

  public int awardForReaction(String username) {
    User user = userRepository.findByUsername(username).orElseThrow();
    ExperienceLog log = getTodayLog(user);
    if (log.getReactionCount() > 3) return 0;
    log.setReactionCount(log.getReactionCount() + 1);
    experienceLogRepository.save(log);
    return addExperience(user, 5);
  }

  public int awardForSignin(String username) {
    boolean first = userVisitService.recordVisit(username);
    if (!first) return 0;
    User user = userRepository.findByUsername(username).orElseThrow();
    return addExperience(user, 5);
  }

  public int getLevel(int exp) {
    int level = 0;
    for (int t : LEVEL_EXP) {
      if (exp >= t) level++;
      else break;
    }
    return level;
  }

  public int nextLevelExp(int exp) {
    for (int t : LEVEL_EXP) {
      if (exp < t) return t;
    }
    return LEVEL_EXP[LEVEL_EXP.length - 1];
  }
}