package com.ycl.jxkg.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.ycl.jxkg.base.Result;
import com.ycl.jxkg.context.WebContext;
import com.ycl.jxkg.domain.entity.Exam;
import com.ycl.jxkg.domain.entity.ExamPaperScore;
import com.ycl.jxkg.domain.entity.Meet;
import com.ycl.jxkg.domain.entity.StudyRecord;
import com.ycl.jxkg.domain.vo.ExamVO;
import com.ycl.jxkg.domain.vo.MeetVO;
import com.ycl.jxkg.domain.vo.student.HomeVO;
import com.ycl.jxkg.mapper.*;
import com.ycl.jxkg.service.ExamPaperScoreService;
import com.ycl.jxkg.service.HomeService;
import lombok.RequiredArgsConstructor;
import org.checkerframework.checker.units.qual.A;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.CollectionUtils;

import java.math.BigDecimal;
import java.math.RoundingMode;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

/**
 * 首页 服务实现类
 *
 * @author flq
 * @since 2024-06-17
 */
@Service
@RequiredArgsConstructor
public class HomeServiceImpl implements HomeService {
    @Autowired
    private WebContext webContext;
    @Autowired
    private MeetMapper meetMapper;
    @Autowired
    private ExamMapper examMapper;
    @Autowired
    private StudyRecordMapper studyRecordMapper;
    @Autowired
    private ExamPaperScoreMapper scoreMapper;
    @Autowired
    private ClassesUserMapper classesUserMapper;

    @Override
    public Result home() {
        HomeVO vo = new HomeVO();
        Integer userId = webContext.getCurrentUser().getId();
        vo.setUserId(userId);
        //所在的班级
        List<Integer> classes = classesUserMapper.getClassesByUserId(userId);
        //学习记录
        StudyRecord studyRecord = studyRecordMapper.getByStudentId(userId);
        if (studyRecord != null) {
            Long studyTime = studyRecord.getStudyTime();
            BigDecimal studyTimeVo = new BigDecimal(studyTime).divide(new BigDecimal(3600), 1, RoundingMode.HALF_UP);
            vo.setLastTime(studyRecord.getLastTime());
            vo.setStudyTime(studyTimeVo);
            vo.setMeetCount(studyRecord.getMeetCount());
        }else {
            vo.setStudyTime(BigDecimal.ZERO);
            vo.setMeetCount(0);
        }
        //平均分
        QueryWrapper<ExamPaperScore> scoreWapper = new QueryWrapper<ExamPaperScore>();
        scoreWapper.eq("user_id", userId);
        List<ExamPaperScore> examPaperScores = scoreMapper.selectList(scoreWapper);
        if (CollectionUtils.isEmpty(examPaperScores)) {
            vo.setScoreAverage("0");
        } else {
            BigDecimal totalScore = examPaperScores.stream()
                    .map(ExamPaperScore::getScore)
                    .reduce(BigDecimal.ZERO, BigDecimal::add);
            int size = examPaperScores.size();
            vo.setScoreAverage(totalScore.divide(new BigDecimal(size), 1, RoundingMode.HALF_UP) + "");
        }
        List<MeetVO> meetList = new ArrayList<>();
        List<ExamVO> examList = new ArrayList<>();
        if (!CollectionUtils.isEmpty(classes)) {
            LocalDate nowDate = LocalDate.now();
            // 计算七天后的日期
            LocalDate sevenDayLaterDate = nowDate.plusDays(7);
            LocalDateTime now = LocalDateTime.of(nowDate, LocalTime.MIN);
            LocalDateTime sevenDayLater = LocalDateTime.of(sevenDayLaterDate, LocalTime.MIN);
            //我的课程
            QueryWrapper<Meet> meetQueryWrapper = new QueryWrapper<>();
            meetQueryWrapper.in("classes_id",classes);
            meetQueryWrapper.between("start_time", now,sevenDayLater);
            List<Meet> meets = meetMapper.selectList(meetQueryWrapper);
            for (Meet meet : meets) {
                MeetVO meetVO = new MeetVO();
                BeanUtils.copyProperties(meet,meetVO);
                meetList.add(meetVO);
            }
            //我的考试
            QueryWrapper<Exam> examQueryWrapper = new QueryWrapper<>();
            examQueryWrapper.in("classes_id",classes);
            examQueryWrapper.between("start_time", now,sevenDayLater);
            List<Exam> exams = examMapper.selectList(examQueryWrapper);
            for (Exam exam : exams) {
                ExamVO examVO = new ExamVO();
                BeanUtils.copyProperties(exam,examVO);
                examList.add(examVO);
            }
        }
        //我的课程
        vo.setMeetList(meetList);
        //我的考试
        vo.setExamList(examList);
        return Result.ok(vo);
    }
}