package com.krylov.refound.service;

import com.krylov.refound.entity.Post;
import com.krylov.refound.enums.PostStatus;
import com.krylov.refound.repository.FavoriteRepository;
import com.krylov.refound.repository.PostRepository;
import java.time.LocalDateTime;
import java.util.List;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

@Slf4j
@Service
@RequiredArgsConstructor
public class SchedulerService {

  private final PostRepository postRepository;
  private final FavoriteRepository favoriteRepository;

  /**
   * Runs every day at 00:01 to delete:
   * 1. Posts with CLOSED status
   * 2. Posts older than 6 months
   */
  @Scheduled(cron = "0 1 0 * * ?")
  @Transactional
  public void deleteExpiredPosts() {
    log.info("Starting scheduled cleanup of expired posts...");
    
    LocalDateTime sixMonthsAgo = LocalDateTime.now().minusMonths(6);
    
    // Find and delete posts with CLOSED status
    List<Post> closedPosts = postRepository.findByStatus(PostStatus.CLOSED);
    if (!closedPosts.isEmpty()) {
      // Delete favorites first to avoid foreign key constraint violation
      favoriteRepository.deleteByPostIn(closedPosts);
      log.info("Deleted {} favorites for CLOSED posts", closedPosts.size());
      
      postRepository.deleteAll(closedPosts);
      log.info("Deleted {} posts with CLOSED status", closedPosts.size());
    }
    
    // Find and delete posts older than 6 months
    List<Post> oldPosts = postRepository.findByCreatedAtBefore(sixMonthsAgo);
    if (!oldPosts.isEmpty()) {
      // Delete favorites first to avoid foreign key constraint violation
      favoriteRepository.deleteByPostIn(oldPosts);
      log.info("Deleted {} favorites for old posts", oldPosts.size());
      
      postRepository.deleteAll(oldPosts);
      log.info("Deleted {} posts older than 6 months", oldPosts.size());
    }
    
    log.info("Scheduled cleanup completed successfully");
  }
}