package com.guwan.backend.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.guwan.backend.annotation.OperationLog;
import com.guwan.backend.dto.video.VideoDTO;
import com.guwan.backend.entity.Video;
import com.guwan.backend.entity.VideoLike;
import com.guwan.backend.mapper.VideoLikeMapper;
import com.guwan.backend.mapper.VideoMapper;
import com.guwan.backend.service.VideoService;
import com.guwan.backend.service.VideoSearchService;
import com.guwan.backend.util.MinioUtil;
import com.guwan.backend.util.SecurityUtil;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Slf4j
@Service
@RequiredArgsConstructor
public class VideoServiceImpl implements VideoService {

    private final VideoMapper videoMapper;
    private final MinioUtil minioUtil;
    private final SecurityUtil securityUtil;
    private final VideoLikeMapper videoLikeMapper;
    private final VideoSearchService videoSearchService;

    @Override
    @Transactional
    @OperationLog(description = "上传视频", operationType = "上传")
    public VideoDTO uploadVideo(String fileUrl, String title, String description, String tags) {
        // 获取当前用户
        Long userId = securityUtil.getCurrentUserId();
        if (userId == null) {
            throw new IllegalStateException("用户未登录");
        }

        try {
            // 上传视频文件到MinIO

            String url = fileUrl;

            // 创建视频记录
            Video video = new Video();
            video.setTitle(title);
            video.setDescription(description);
            video.setUrl(url);
           // video.setSize(file.getSize());
            video.setUserId(userId);
            video.setStatus("PUBLISHED");
            video.setTags(tags);
            video.setViewCount(0);
            video.setLikeCount(0);

            videoMapper.insert(video);

            // 保存到ES
            videoSearchService.saveOrUpdate(video);

            return convertToDTO(video);
        } catch (Exception e) {
            log.error("上传视频失败", e);
            throw new RuntimeException("上传视频失败", e);
        }
    }

    @Override
    @Transactional
    @OperationLog(description = "更新视频信息", operationType = "更新")
    public VideoDTO updateVideo(VideoDTO videoDTO) {
        Video video = videoMapper.selectById(videoDTO.getId());
        if (video == null) {
            throw new IllegalArgumentException("视频不存在");
        }

        // 检查权限
        Long currentUserId = securityUtil.getCurrentUserId();
        if (!video.getUserId().equals(currentUserId)) {
            throw new IllegalStateException("无权修改此视频");
        }

        BeanUtils.copyProperties(videoDTO, video, "id", "userId", "url", "createdTime");
        videoMapper.updateById(video);

        return convertToDTO(video);
    }

    @Override
    @Transactional
    @OperationLog(description = "删除视频", operationType = "删除")
    public void deleteVideo(Long id) {
        Video video = videoMapper.selectById(id);
        if (video == null) {
            return;
        }

        // 检查权限
        Long currentUserId = securityUtil.getCurrentUserId();
        if (!video.getUserId().equals(currentUserId)) {
            throw new IllegalStateException("无权删除此视频");
        }

        // 从MinIO中删除视频文件
        String fileName = video.getUrl().substring(video.getUrl().lastIndexOf("/") + 1);
        minioUtil.deleteFile("videos", fileName);

        // 删除数据库记录
        videoMapper.deleteById(id);

        // 从ES中删除
        videoSearchService.delete(id);
    }

    @Override
    @OperationLog(description = "获取视频详情", operationType = "查询")
    public VideoDTO getVideoById(Long id) {
        Video video = videoMapper.selectById(id);
        return convertToDTO(video);
    }

    @Override
    @OperationLog(description = "获取视频列表", operationType = "查询")
    public IPage<VideoDTO> getVideoList(Integer pageNum, Integer pageSize, String keyword) {
        Page<Video> page = new Page<>(pageNum, pageSize);
        
        LambdaQueryWrapper<Video> wrapper = new LambdaQueryWrapper<Video>()
            .eq(Video::getStatus, "PUBLISHED")
            .like(keyword != null, Video::getTitle, keyword)
            .or()
            .like(keyword != null, Video::getDescription, keyword)
            .orderByDesc(Video::getCreatedTime);

        IPage<Video> videoPage = videoMapper.selectPage(page, wrapper);
        
        return videoPage.convert(this::convertToDTO);
    }

    @Override
    @Transactional
    @OperationLog(description = "增加视频观看次数", operationType = "更新")
    public void incrementViewCount(Long id) {
        Video video = videoMapper.selectById(id);
        if (video != null) {
            video.setViewCount(video.getViewCount() + 1);
            videoMapper.updateById(video);

            // 更新ES中的观看次数
            videoSearchService.updateViewCount(id, video.getViewCount());
        }
    }

    @Override
    @Transactional
    @OperationLog(description = "视频点赞/取消点赞", operationType = "更新")
    public void toggleLike(Long id) {
        // 获取当前用户
        Long userId = securityUtil.getCurrentUserId();
        if (userId == null) {
            throw new IllegalStateException("用户未登录");
        }

        // 检查视频是否存在
        Video video = videoMapper.selectById(id);
        if (video == null) {
            throw new IllegalArgumentException("视频不存在");
        }

        // 检查是否已点赞
        LambdaQueryWrapper<VideoLike> wrapper = new LambdaQueryWrapper<VideoLike>()
            .eq(VideoLike::getVideoId, id)
            .eq(VideoLike::getUserId, userId);
        
        VideoLike like = videoLikeMapper.selectOne(wrapper);

        if (like == null) {
            // 未点赞，添加点赞记录
            like = new VideoLike();
            like.setVideoId(id);
            like.setUserId(userId);
            videoLikeMapper.insert(like);

            // 更新视频点赞数
            video.setLikeCount(video.getLikeCount() + 1);
        } else {
            // 已点赞，取消点赞
            videoLikeMapper.deleteById(like.getId());

            // 更新视频点赞数
            video.setLikeCount(video.getLikeCount() - 1);
        }

        videoMapper.updateById(video);

        // 更新ES中的点赞次数
        videoSearchService.updateLikeCount(id, video.getLikeCount());
    }

    // 添加新方法：检查用户是否已点赞
    public boolean hasLiked(Long videoId) {
        Long userId = securityUtil.getCurrentUserId();
        if (userId == null) {
            return false;
        }

        LambdaQueryWrapper<VideoLike> wrapper = new LambdaQueryWrapper<VideoLike>()
            .eq(VideoLike::getVideoId, videoId)
            .eq(VideoLike::getUserId, userId);
        
        return videoLikeMapper.selectCount(wrapper) > 0;
    }

    @Override
    public List<VideoDTO> searchVideosByEs(String keyword) {
        return videoSearchService.search(keyword);
    }

    @Override
    public List<VideoDTO> getSimilarVideosByEs(Long id, int limit) {
        return videoSearchService.findSimilar(id, limit);
    }

    private VideoDTO convertToDTO(Video video) {
        if (video == null) {
            return null;
        }
        VideoDTO dto = new VideoDTO();
        BeanUtils.copyProperties(video, dto);
        
        // 设置是否已点赞
      //  dto.setHasLiked(hasLiked(video.getId()));
        
        return dto;
    }
}