package com.tanpu.community.service;

import com.tanpu.biz.common.enums.clue.PageEnum;
import com.tanpu.biz.common.enums.community.CollectionTypeEnum;
import com.tanpu.biz.common.enums.community.TopicStatusEnum;
import com.tanpu.community.api.beans.qo.ThemeAnalysDO;
import com.tanpu.community.api.beans.qo.TopicRankQo;
import com.tanpu.community.api.beans.vo.feign.fatools.UserInfoResp;
import com.tanpu.community.cache.RedisCache;
import com.tanpu.community.dao.entity.community.ThemeEntity;
import com.tanpu.community.dao.entity.community.TopicEntity;
import com.tanpu.community.util.BizUtils;
import com.tanpu.community.util.ConvertUtil;
import com.tanpu.community.util.TimeUtils;
import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.Random;
import java.util.stream.Collectors;

@Service
public class RankService {

    @Value("${rank.theme.viewRate:0.1}")
    public Double viewRate;
    @Value("${rank.theme.forwardRate:3}")
    public Double forwardRate;
    @Value("${rank.theme.commentRate:2}")
    public Double commentRate;
    @Value("${rank.theme.likeRate:3}")
    public Double likeRate;
    @Value("${rank.theme.collectRate:3}")
    public Double collectRate;
    //用户质量权重
    @Value("${rank.theme.userWeightRate:0.9}")
    public Double userWeightRate;
    //初始质量
    @Value("${rank.theme.initialWeight:1.0}")
    public Double initialWeight;
    //时间系数
    @Value("${rank.theme.timeRate:0.2}")
    public Double timeRate;


    @Value("${rank.topic.viewRate:1}")
    public Double topicViewRate;
    @Value("${rank.topic.discussRate:3}")
    public Double topicDiscussRate;
    @Value("${rank.topic.themeRate:1}")
    public Double topicThemeRate;
    //时间系数
    @Value("${rank.theme.timeRate:1}")
    public Double topicTimeRate;

    @Autowired
    private ThemeService themeService;
    @Autowired
    private CollectionService collectionService;
    @Autowired
    private CommentService commentService;
    @Autowired
    private TopicService topicService;
    @Autowired
    private VisitLogService visitLogService;

    @Autowired
    private FeignService feignService;

    @Autowired
    private RedisCache redisCache;

    @Resource
    private RankLogService rankLogService;

    //最热
    private List<ThemeAnalysDO> hotestThemes = new ArrayList<>();

    private List<TopicRankQo> rankTopicList = new ArrayList<>();
    private List<TopicRankQo> rankTopicListTop4 = new ArrayList<>();


    /**
     * 计算主题热度排行
     */
    public void rankThemes() {

        LocalDateTime start = LocalDateTime.now();
        //7天内所有主题进行热度值排序
        List<ThemeEntity> themeEntities = themeService.queryRecentdaysOrHasTopic(60);
        if (CollectionUtils.isEmpty(themeEntities)) {
            return;
        }
        List<ThemeAnalysDO> themeAnalysDOS = ConvertUtil.themeEntityToAnalysDOs(themeEntities);
        //批量查询
        List<String> themeIds = themeAnalysDOS.stream().map(ThemeAnalysDO::getThemeId).collect(Collectors.toList());
        Map<String, Integer> likeCountMap = collectionService.getCountMapByType(themeIds, CollectionTypeEnum.LIKE_THEME);
        Map<String, Integer> bookCountMap = collectionService.getCountMapByType(themeIds, CollectionTypeEnum.COLLECT_THEME);
        Map<String, Integer> commentCountMap = commentService.getCountMapByThemeIds(themeIds);
        Map<String, Integer> forwardCountMap = themeService.getForwardCountMap(themeIds);
        Map<String, Integer> visitCountMap = visitLogService.getCountMapByTargetIds(themeIds, PageEnum.COMM_VISIT_THEME.getId());

        for (ThemeAnalysDO theme : themeAnalysDOS) {
            String themeId = theme.getThemeId();
            theme.setCommentCount(commentCountMap.getOrDefault(themeId, 0));
            theme.setLikeCount(likeCountMap.getOrDefault(themeId, 0));
            theme.setForwardCount(forwardCountMap.getOrDefault(themeId, 0));
            theme.setCollectCount(bookCountMap.getOrDefault(themeId, 0));
            theme.setViewCount(visitCountMap.getOrDefault(themeId, 0));
            //查询用户质量
            String authorId = theme.getAuthorId();
            UserInfoResp authorInfo = feignService.getUserInfoById(authorId);
            if (authorInfo == null || authorInfo.getLevelGrade() == null) {
                theme.setUserWeight(0.0);
            } else {
                // 设置用户权重
                theme.setUserWeight(authorInfo.getLevelGrade() * 1.0);

            }
            //打分
            this.calculateThemeScore(theme);
        }
        //排序

        hotestThemes = themeAnalysDOS.stream()
                .sorted(Comparator.comparing(ThemeAnalysDO::getScore).reversed())
                .collect(Collectors.toList());

        // 落库
        if (redisCache.setIfAbsent("logThemeRank", "1", 60)) {
            rankLogService.logThemeRank(hotestThemes, start, TimeUtils.calMillisTillNow(start));
            redisCache.evict("logThemeRank");
        }


    }


    /**
     * 计算话题热度
     *
     * @return
     */
    public void rankTopics() {
        LocalDateTime start = LocalDateTime.now();
        List<TopicEntity> topicEntities = topicService.queryAll();
        if (CollectionUtils.isEmpty(topicEntities)) {
            this.rankTopicList = new ArrayList<>();
            this.rankTopicListTop4 = new ArrayList<>();
            return;
        }
        List<TopicRankQo> topicRankQos = ConvertUtil.topicEntityToRankQos(topicEntities);

        // 统计话题下的所有主题数据
        List<String> topicIds = topicRankQos.stream().map(TopicRankQo::getTopicId).collect(Collectors.toList());
        Map<String, Integer> topicViewMap = visitLogService.getCountMapByTargetIds(topicIds,
                Arrays.asList(PageEnum.COMM_VISIT_TOPIC_DETAIL_HOT.getId(),PageEnum.COMM_VISIT_TOPIC_DETAIL_NEW.getId(),PageEnum.COMM_VISIT_TOPIC_DETAIL.getId()));
        for (TopicRankQo topic : topicRankQos) {
            List<String> themeIds = themeService.queryThemeIdsByTopic(topic.getTopicId());
            if (CollectionUtils.isEmpty(themeIds)) {

                topic.setViewCount(topicViewMap.getOrDefault(topic.getTopicId(), 0));
                topic.setDisscussCount(0);
                topic.setThemeWeight(0.0);
            } else {
                // 浏览量
                Integer topicPV = topicViewMap.getOrDefault(topic.getTopicId(), 0);
                Integer themePV = visitLogService.queryThemeVisit(themeIds);
                topic.setViewCount(topicPV + themePV + topic.getViewCntAdjust());
                //讨论数=发布主题贴数+回复总数
                Integer commentCount = commentService.getTotalCountByThemeIds(themeIds);
                topic.setDisscussCount(themeIds.size() + commentCount);
                //帖子权重，求和
                double themeSum = getHotestThemes().stream().filter(o -> topic.getTopicId().equals(o.getTopicId()))
                        .mapToDouble(ThemeAnalysDO::getScore)
                        .sum();
                topic.setThemeWeight(themeSum);
            }
            // 打分
            calculateTopicScore(topic);
            // 格式化浏览量、讨论量
            topic.setFormatViewCount(BizUtils.formatCountNumber(topic.getViewCount()));
            topic.setFormatDisscussCount(BizUtils.formatCountNumber(topic.getDisscussCount()));

        }

        // 排序
        List<TopicRankQo> rankList = topicRankQos.stream()
                .sorted(Comparator.comparing(TopicRankQo::getScore).reversed())
                .collect(Collectors.toList());
        // 非“新”话题才能添加“热”标签
        if (!TopicStatusEnum.NEWEST.getCode().equals(rankList.get(0).getType())) {
            rankList.get(0).setType(TopicStatusEnum.HOTTEST.getCode());
        }
        this.rankTopicList = rankList;

        // 首页推荐话题
        // 最新的2个话题
        List<TopicRankQo> newest2Topic = topicRankQos.stream().filter(TopicRankQo::judgeNewTopic)
                .sorted(Comparator.comparing(TopicRankQo::getMinutesTillNow)).limit(2).collect(Collectors.toList());
        // 最熱的2个话题
        List<TopicRankQo> top4Topic = rankList.stream()
                .limit(6)
                .filter(o -> !newest2Topic.contains(o))
                .limit(4 - newest2Topic.size())
                .collect(Collectors.toList());
        top4Topic.addAll(newest2Topic);
        this.rankTopicListTop4 = top4Topic.stream()
                .sorted(Comparator.comparing(TopicRankQo::getScore).reversed())
                .collect(Collectors.toList());

        //落库
        int i = new Random().nextInt(3);
        if (i==1 && redisCache.setIfAbsent("logTopicRank", "1", 60)) {
            rankLogService.logTopicRank(rankList, start, TimeUtils.calMillisTillNow(start));
            redisCache.evict("logTopicRank");
        }
    }

    /**
     * 从排序列表中返回话题详情
     *
     * @param topicId 话题Id
     * @return
     */
    public TopicRankQo getTopicDetail(String topicId) {
        if (this.rankTopicList.size() == 0) {
            rankTopics();
        }
        List<TopicRankQo> matchTopic = this.rankTopicList.stream().filter(o -> topicId.equals(o.getTopicId())).limit(1).collect(Collectors.toList());
        matchTopic.add(new TopicRankQo());
        return matchTopic.get(0);
    }


    public List<TopicRankQo> getRankTopicList(String keyword) {
        if (this.rankTopicList.size() == 0) {
            this.rankTopics();
        }
        if (StringUtils.isEmpty(keyword)) {
            return rankTopicList;
        } else {
            //过滤关键字
            return this.rankTopicList.stream().filter(o -> o.getTopicTitle().contains(keyword)).collect(Collectors.toList());
        }
    }

    public List<TopicRankQo> getRankTopicListTop4() {
        if (this.rankTopicList.size() == 0) {
            this.rankTopics();
        }
        return rankTopicListTop4;
    }

    public List<ThemeAnalysDO> getHotestThemes() {
        if (this.hotestThemes.size() == 0) {
            rankThemes();
        }
        return hotestThemes;
    }

    public List<String> getRankThemeListByTopic(String topicId, List<String> excludeIds) {
        if (this.hotestThemes.size() == 0) {
            this.rankThemes();
        }

        return hotestThemes.stream()
                .filter(o -> topicId.equals(o.getTopicId()) && !excludeIds.contains(o.getThemeId()))
                .map(ThemeAnalysDO::getThemeId)
                .collect(Collectors.toList());
    }


    // todo 这里用户层面只考虑了用户的gradelevel，后续可以为用户的历史贴子打分。根据用户发表的历史帖子的质量，为用户评分。例如，历史帖子的关注度，用户的粉丝数量。
    // todo 可以考虑一下话题的热度。
    private void calculateThemeScore(ThemeAnalysDO theme) {
        // 质量=帖子质量+用户质量
        double w = theme.getViewCount() * viewRate
                + theme.getForwardCount() * forwardRate
                + theme.getCommentCount() * commentRate
                + theme.getLikeCount() * likeRate
                + theme.getCollectCount() * collectRate
                + Math.pow(theme.getUserWeight(), userWeightRate);
        double score = (w + initialWeight) / Math.pow(theme.getMinutesTillNow() + 1, timeRate);
        theme.setScore(score);
    }


    public void calculateTopicScore(TopicRankQo topic) {
        //顶置话题
        if (topic.getIsTop() > 0) {
            topic.setScore(Double.MAX_VALUE);
            return;
        }
        Double socre = ((topic.getDisscussCount() * topicDiscussRate + topic.getViewCount() * topicViewRate)
                / Math.pow(topic.getMinutesTillNow() + 1, topicTimeRate))
                + topic.getThemeWeight() * topicThemeRate;
        topic.setScore(socre);
    }
}