package com.tcm.training.admin.live.service;

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.tcm.training.admin.common.Jsons;
import com.tcm.training.admin.common.PageResponse;
import com.tcm.training.admin.live.dto.LiveCourseStatusRequest;
import com.tcm.training.admin.live.dto.LiveCourseUpsertRequest;
import com.tcm.training.admin.live.entity.Expert;
import com.tcm.training.admin.live.entity.LiveCourse;
import com.tcm.training.admin.live.entity.LiveSession;
import com.tcm.training.admin.live.entity.LiveSessionQuestion;
import com.tcm.training.admin.live.mapper.ExpertMapper;
import com.tcm.training.admin.live.mapper.LiveCourseMapper;
import com.tcm.training.admin.live.mapper.LiveSessionMapper;
import com.tcm.training.admin.live.mapper.LiveSessionQuestionMapper;
import com.tcm.training.admin.live.vo.ExpertVO;
import com.tcm.training.admin.live.vo.LiveCourseDetailVO;
import com.tcm.training.admin.live.vo.LiveCourseListItemVO;
import com.tcm.training.admin.live.vo.LiveCourseListRow;
import com.tcm.training.admin.live.vo.LiveCourseDetailRow;
import com.tcm.training.admin.live.vo.LiveCourseStatusVO;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
public class LiveCourseAppService {

    private final LiveCourseMapper liveCourseMapper;
    private final ExpertMapper expertMapper;
    private final LiveSessionMapper liveSessionMapper;
    private final LiveSessionQuestionMapper liveSessionQuestionMapper;

    public LiveCourseAppService(LiveCourseMapper liveCourseMapper,
                                ExpertMapper expertMapper,
                                LiveSessionMapper liveSessionMapper,
                                LiveSessionQuestionMapper liveSessionQuestionMapper) {
        this.liveCourseMapper = liveCourseMapper;
        this.expertMapper = expertMapper;
        this.liveSessionMapper = liveSessionMapper;
        this.liveSessionQuestionMapper = liveSessionQuestionMapper;
    }

    public PageResponse<LiveCourseListItemVO> page(int page, int pageSize, String keyword, Long expertId, Integer status, Integer liveStatus) {
        IPage<LiveCourseListRow> p = liveCourseMapper.selectCoursePage(new Page<LiveCourseListRow>(page, pageSize),
                keyword, expertId, status, liveStatus);

        List<LiveCourseListItemVO> list = new ArrayList<LiveCourseListItemVO>();
        for (LiveCourseListRow row : p.getRecords()) {
            LiveCourseListItemVO vo = new LiveCourseListItemVO();
            vo.setId(row.getId());
            vo.setTitle(row.getTitle());
            vo.setLevel(row.getLevel());
            vo.setExpert(new ExpertVO(row.getExpertId(), row.getExpertName(), row.getExpertAvatar()));
            vo.setCoverImg(row.getCoverImg());
            vo.setReserveCount(row.getReserveCount() == null ? 0L : row.getReserveCount());
            vo.setWatchCount(row.getWatchCount() == null ? 0L : row.getWatchCount());
            vo.setQuizPoints(row.getQuizPoints());
            vo.setStartTime(row.getStartTime());
            vo.setLiveStatus(row.getLiveStatus());
            vo.setStatus(row.getStatus());
            vo.setCreatedAt(row.getCreatedAt());
            list.add(vo);
        }

        return PageResponse.of(list, p.getTotal(), p.getCurrent(), p.getSize());
    }

    @Transactional
    public LiveCourseDetailVO create(LiveCourseUpsertRequest req) {
        throw new IllegalArgumentException("直播课程为初始化数据，禁止新增");
        /*
        validateExpert(req.getExpertId());

        LiveCourse course = new LiveCourse();
        course.setTitle(req.getTitle());
        course.setLevel(req.getLevel());
        course.setExpertId(req.getExpertId());
        course.setCoverImg(req.getCoverImg());
        course.setBannerImgs(req.getBannerImgs());
        course.setIntro(req.getIntro());
        course.setTargetUsers(req.getTargetUsers());
        course.setQuizDelayMinutes(req.getQuizDelayMinutes());
        course.setQuizPoints(req.getQuizPoints());
        course.setStatus(req.getStatus());
        liveCourseMapper.insert(course);

        return detail(course.getId());
        */
    }

    public LiveCourseDetailVO detail(Long id) {
        LiveCourseDetailRow row = liveCourseMapper.selectCourseDetail(id);
        if (row == null) {
            throw new IllegalArgumentException("课程不存在");
        }

        LiveCourseDetailVO vo = new LiveCourseDetailVO();
        vo.setId(row.getId());
        vo.setTitle(row.getTitle());
        vo.setLevel(row.getLevel());
        vo.setExpert(new ExpertVO(row.getExpertId(), row.getExpertName(), row.getExpertAvatar()));
        vo.setCoverImg(row.getCoverImg());
        vo.setBannerImgs(Jsons.parseStringList(row.getBannerImgs()));
        vo.setIntro(row.getIntro());
        vo.setTargetUsers(row.getTargetUsers());
        vo.setQuizDelayMinutes(row.getQuizDelayMinutes());
        vo.setQuizPoints(row.getQuizPoints());
        vo.setStartTime(row.getStartTime());
        vo.setVideoUrl(row.getVideoUrl());
        vo.setLiveStatus(row.getLiveStatus());
        vo.setStatus(row.getStatus());
        vo.setReserveCount(row.getReserveCount() == null ? 0L : row.getReserveCount());
        vo.setWatchCount(row.getWatchCount() == null ? 0L : row.getWatchCount());
        vo.setCreatedAt(row.getCreatedAt());
        vo.setUpdatedAt(row.getUpdatedAt());
        return vo;
    }

    @Transactional
    public LiveCourseDetailVO update(Long id, LiveCourseUpsertRequest req) {
        validateExpert(req.getExpertId());

        LiveCourse course = liveCourseMapper.selectById(id);
        if (course == null) {
            throw new IllegalArgumentException("课程不存在");
        }

        course.setTitle(req.getTitle());
        course.setLevel(req.getLevel());
        course.setExpertId(req.getExpertId());
        course.setCoverImg(req.getCoverImg());
        course.setBannerImgs(req.getBannerImgs());
        course.setIntro(req.getIntro());
        course.setTargetUsers(req.getTargetUsers());
        course.setQuizDelayMinutes(req.getQuizDelayMinutes());
        course.setQuizPoints(req.getQuizPoints());
        course.setStatus(req.getStatus());
        liveCourseMapper.updateById(course);

        return detail(id);
    }

    @Transactional
    public LiveCourseStatusVO patchStatus(Long id, LiveCourseStatusRequest req) {
        LiveCourse course = liveCourseMapper.selectById(id);
        if (course == null) {
            throw new IllegalArgumentException("课程不存在");
        }
        course.setStatus(req.getStatus());
        liveCourseMapper.updateById(course);
        return new LiveCourseStatusVO(id, req.getStatus());
    }

    @Transactional
    public void delete(Long id) {
        throw new IllegalArgumentException("直播课程为初始化数据，禁止删除");
    }

    private void validateExpert(Long expertId) {
        Expert expert = expertMapper.selectById(expertId);
        if (expert == null) {
            throw new IllegalArgumentException("授课专家不存在");
        }
        if (expert.getStatus() != null && expert.getStatus() != 1) {
            throw new IllegalArgumentException("授课专家已禁用");
        }
    }

}