package com.ruoyi.sim.service.impl;

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

import com.ruoyi.common.core.domain.AjaxResult;
import com.ruoyi.common.utils.DateUtils;
import com.ruoyi.sim.config.SimConfig;
import com.ruoyi.sim.config.SimDebugConfig;
import com.ruoyi.sim.domain.*;
import com.ruoyi.sim.domain.vo.RealExamVo;
import com.ruoyi.sim.domain.vo.StudentRealExamIngVo;
import com.ruoyi.sim.domain.vo.StudentRealExamPostVo;
import com.ruoyi.sim.domain.vo.StudentRealExamPreVo;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Lazy;
import org.springframework.stereotype.Service;
import com.ruoyi.sim.mapper.RealExamMapper;
import org.springframework.transaction.annotation.Transactional;

/**
 * 考试Service业务层处理
 *
 * @author tom
 * @date 2024-12-15
 */
@Service
public class RealExamService {
    @Autowired
    private RealExamMapper realExamMapper;

    /**
     * 查询考试
     *
     * @param examId 考试主键
     * @return 考试
     */
    public RealExam selectRealExamByExamId(Long examId) {
        return realExamMapper.selectRealExamByExamId(examId);
    }

    /**
     * 查询考试列表
     *
     * @param realExam 考试
     * @return 考试
     */
    public List<RealExam> selectRealExamList(RealExam realExam) {
        return realExamMapper.selectRealExamList(realExam);
    }

    /**
     * 新增考试
     *
     * @param realExam 考试
     * @return 结果
     */
    public int insertRealExam(RealExam realExam) {
        realExam.setCreateTime(DateUtils.getNowDate());
        return realExamMapper.insertRealExam(realExam);
    }

    /**
     * 修改考试
     *
     * @param realExam 考试
     * @return 结果
     */
    public int updateRealExam(RealExam realExam) {
        realExam.setUpdateTime(DateUtils.getNowDate());
        return realExamMapper.updateRealExam(realExam);
    }

    /**
     * 批量删除考试
     *
     * @param examIds 需要删除的考试主键
     * @return 结果
     */
    public int deleteRealExamByExamIds(Long[] examIds) {
        return realExamMapper.deleteRealExamByExamIds(examIds);
    }

    /**
     * 删除考试信息
     *
     * @param examId 考试主键
     * @return 结果
     */
    public int deleteRealExamByExamId(Long examId) {
        return realExamMapper.deleteRealExamByExamId(examId);
    }

    // -------------------------------- tom add  --------------------------------
    private static final Logger l = LoggerFactory.getLogger(CommSendService.class);

    @Autowired
    private CommReceiveService commReceiveService;
    @Autowired
    private StudentService studentService;
    @Autowired
    private SimService simService;
    @Autowired
    private SeatService seatService;
    @Autowired
    private RealExamCollectionService realExamCollectionService;
    @Autowired
    private RealExamFaultService realExamFaultService;
    @Autowired
    @Lazy
    private CommSendService commSendService;
    @Autowired
    private SimConfig simConfig;

    /**
     * examId 是否有效。
     *
     * @param examId
     * @return
     */
    public boolean exist(Long examId) {
        if (examId == null) {
            return false;
        }
        if (examId == 0) {
            return false;
        }
        RealExam re = selectRealExamByExamId(examId);
        if (re == null) {
            return false;
        }
        return true;
    }

    public List<RealExamVo> list(RealExam q) {
        List<RealExamVo> list = new ArrayList<>();
        realExamMapper.selectRealExamList(q).forEach(re -> {
            RealExamVo v = new RealExamVo();
            RealExamCollection rec = realExamCollectionService.selectRealExamCollectionByExamCollectionId(re.getExamCollectionId());
            v.setRealExam(re);
            v.setRealExamCollection(rec);
            list.add(v);
        });
        return list;
    }

    public List<RealExam> listAllByStatus(String state) {
        RealExam q = new RealExam();
        q.setExamStatus(state);
        return selectRealExamList(q);
    }

    /**
     * 交卷自动修改关联状态
     *
     * @param examId
     * @param state
     * @return
     */
    @Transactional
    public int updateOneState(long examId, final String state) {
        if (false) {
            // php项目维护exam_status字段。java这边不操作。
            // 屏蔽
            return 0;
        }
        RealExam q = selectRealExamByExamId(examId);
        // todo:屏蔽
        if (false && RealExam.State.SUBMITTED.equals(state)) {
            // 关联故障list同步锁死。
            realExamFaultService.listAllType2State2and3ByExamId(q.getExamId())
                    .forEach(ref -> {
                        ref.setRefState(RealExamFault.State.FINISH);
                        realExamFaultService.updateRealExamFault(ref);
                    });
        }
        q.setExamStatus(state);
        return updateRealExam(q);
    }

    /**
     * [学生]进入考试。
     *
     * @return RealExam
     */
    public AjaxResult studentEnterRealExam(Long examId) {
        RealExam re = selectRealExamByExamId(examId);
        if (re == null) {
            AjaxResult.error("realExamId error!");
        }
        // todo:应该在登录位置实现
        // todo: temp
        updateOneState(examId, RealExam.State.LOGGED_IN);
        // todo: temp
        realExamFaultService.resetAllType2(examId);
        return AjaxResult.success(re);
    }

    /**
     * [轮询][学生]准备考试界面。
     *
     * @param realExamId
     * @return StudentRealExamPreVo
     */
    public AjaxResult studentLoopPrepareRealExam(Long realExamId) {
        l.info("studentLoopPrepareRealExam");
        // check
        if (realExamId == null || realExamId == 0) {
            // todo:
        }
        //
        RealExam re = selectRealExamByExamId(realExamId);
        if (re == null) {
            // todo:
        }
        // todo: 日期，不可进入考试。
        //
        // todo: 验证学生登录身份`
        Objects.requireNonNull(re);
        RealExamCollection collection =
                realExamCollectionService.selectRealExamCollectionByExamCollectionId(re.getExamCollectionId());
        // check collection
        Sim sim = simService.selectSimBySimId(re.getSimId());
        // check sim
        Student student = studentService.selectStudentByUserId(re.getUserId());
        // check student
        Seat seat = seatService.selectSeatBySeatId(re.getSeatId());
        // check seat
        StudentRealExamPreVo vo = new StudentRealExamPreVo();
        vo.setRealExam(re);
        vo.setRealExamCollection(collection);
        vo.setSim(sim);
        vo.setStudent(student);
        vo.setSeat(seat);
        // todo:多人请求同时进入的问题
        boolean next = studentPrepareRealExamCheck(vo);
        vo.setNext(next);
        if (!next) {
            // 执行模拟器通信，让模拟器准备好。
            // 异步执行
            commSendService.clearListFaultByRealExamAsync(re);
        }
        l.info("vo = {}", vo);

        return AjaxResult.success(vo);
    }

    public boolean studentPrepareRealExamCheck(StudentRealExamPreVo v) {
        if (v == null ||
                v.getRealExam() == null ||
                v.getRealExamCollection() == null ||
                v.getSim() == null ||
                v.getStudent() == null ||
                v.getSeat() == null) {
            return false;
        }
        // todo:在考试日期内。
        // check 一个模拟器的所有选中故障点位都下发成功，准备是否可以
        //
        // todo:??
        // 学生答题中可以再次进入。
        String examStatus = v.getRealExam().getExamStatus();
        String simStatus = v.getSim().getSimState();
        // 兜底
        {
            if (realExamFaultService.isAllType2StateXiaFa(v.getRealExam().getExamId())) {
                // updateOneState(v.getRealExam().getExamId(), RealExam.State.SIM_PREPARE_OK);
            }
        }
        // 模拟器不通信。
        if (!simConfig.isCommGlobal()) {
            return true;
        }
        if ((RealExam.State.SIM_PREPARE_OK.equals(examStatus) ||
                RealExam.State.ANSWERING.equals(examStatus)) &&
                Sim.State.ONLINE.equals(simStatus)
        ) {
            return true;
        }
        return false;
    }

    /**
     * [学生]开始考试
     *
     * @param examId
     * @return RealExam
     */
    @Transactional
    public AjaxResult studentStartRealExam(final Long examId) {
        l.info("studentStartRealExam = {}", examId);
        // todo: 暂时没有解决方案 检查 考试的sim和seat，是否正确对应。
        {
            // todo:delete
            // re.setSimId(getFakeSimId(re));
            // l.info("fake re = {}", re);
        }
        // check id data.
        {
            AjaxResult arE1 = checkExamId(examId);
            if (arE1.isError()) {
                return arE1;
            }
        }
        RealExam re = selectRealExamByExamId(examId);
        Sim s = simService.selectSimBySimId(re.getSimId());
        // Step 1 主动查询一次模拟器状态。获取模拟器在线/离线状态。
        {
            commSendService.checkOneSimState(s, true);
            // 如果模拟器离线
            if (s == null || !Sim.State.ONLINE.equals(s.getSimState())) {
                return AjaxResult.error("未连接模拟器，请检查连接！");
            }
        }
        // Step 2 读取对应一台模拟器 所有故障部位值。检查模拟器所有的 真实的 故障部位 是否异常 或者 空值。特殊的故障部位要单独判断。
        if (SimDebugConfig.CHECK_REPLACE_EMPTY) {
            AjaxResult arE2 = commSendService.readOneSimAllFaultCheck(s);
            if (arE2.isError()) {
                return arE2;
            }
        }
        // Step 3 清除对应一台模拟器 所有 真实的 故障部位故障。
        {
            commSendService.clearOneSimAllFaultByExam(re);
        }
        // Step 4 下发对应一台模拟器 出题选中的 故障位置故障。
        {
            commSendService.writeOneSimAllSelectFaultByExam(re);
        }
        // Step 5 读取对应一台模拟器 所有的 真实的 故障部位 电阻值代表值 作为出题值。
        // 修改关联状态
        {
            commSendService.readOneSimAllFaultFirstTimeByExam(re);
        }
        // Step 6 修改当前Exam状态。
        if (realExamFaultService.isType2ExamPrepareStartOk(re.getExamId())) {
            updateOneState(re.getExamId(), RealExam.State.SIM_PREPARE_OK);
            updateOneState(re.getExamId(), RealExam.State.ANSWERING);
            // 修改真实考试开始时间。
            re.setStartTime(DateUtils.getNowDate());
            updateRealExam(re);
            return AjaxResult.success("开始考试成功!");
        } else {
            return AjaxResult.error("连接超时，请检查模拟器连接!");
        }
    }

    public AjaxResult checkExamId(final Long examId) {
        // check
        // 检查 examId 是否正确存在
        {
            if (!exist(examId)) {
                return AjaxResult.error("对应考试Id不存在！");
            }
        }
        RealExam re = selectRealExamByExamId(examId);
        // 检查 seat_id 是否正确存在
        {
            if (!seatService.exist(re.getSeatId())) {
                return AjaxResult.error("对应座Id不存在！");
            }
        }
        // 检查 sim_id 是否正确存在
        {
            if (!simService.existBySimId(re.getSimId())) {
                return AjaxResult.error("对应模拟器Id不存在！");
            }
        }
        return AjaxResult.success();
    }

    /**
     * 根据考试集合获得sim_id
     *
     * @param exam
     * @return
     */
    @Deprecated
    public long getFakeSimId(RealExam exam) {
        {
            RealExamCollection coll = realExamCollectionService.selectRealExamCollectionByExamCollectionId(exam.getExamCollectionId());
            String simType = coll.getSimType();
            switch (simType) {
                case Sim.TYPE_0001 -> {
                    return 11L;
                }
                case Sim.TYPE_0002 -> {
                    return 12L;
                }
                case Sim.TYPE_0003 -> {
                    return 31L;
                }
            }
        }
        return 0L;
    }

    /**
     * [轮询][学生]正在考试界面。
     *
     * @param realExamId
     * @return StudentRealExamIngVo
     */
    public AjaxResult studentLoopAnsweringRealExam(Long realExamId) {
        RealExam re = selectRealExamByExamId(realExamId);
        RealExamCollection rec = realExamCollectionService.selectRealExamCollectionByExamCollectionId(re.getExamCollectionId());
        StudentRealExamIngVo vo = new StudentRealExamIngVo();
        vo.setRealExam(re);
        long remaining = (re.getStartTime().getTime() + rec.getLimitDuration() * 60 * 1000) - DateUtils.getNowDate().getTime();
        vo.setRemainingMilliseconds(remaining);
        vo.setCompulsiveSubmit(remaining >= RealExam.EXAM_TIMEOUT_LIMIT);
        l.info("studentLoopAnsweringRealExam vo = {}", vo);

        return AjaxResult.success(vo);
    }

    /**
     * [学生]交卷
     *
     * @param examId
     * @return RealExam
     */
    @Transactional
    public AjaxResult studentSubmitRealExam(Long examId) {
        RealExam re = selectRealExamByExamId(examId);
        {
            // todo:delete
            // re.setSimId(getFakeSimId(re));
        }
        // check part.
        {
            AjaxResult arE1 = checkExamId(examId);
            if (arE1.isError()) {
                return arE1;
            }
        }
        // 检查一下模拟器状态。
        Sim s = simService.selectSimBySimId(re.getSimId());
        // 如果模拟器离线
        if (s == null || !Sim.State.ONLINE.equals(s.getSimState())) {
            return AjaxResult.error("未连接模拟器，请检查连接！");
        }
        // 最后读取一下模拟器电阻值。
        commSendService.readOneExamAtLast(re);
        if (realExamFaultService.isType2ExamPrepareSubmitOk(re.getExamId())) {
            re.setExamStatus(RealExam.State.SUBMITTED);
            // 修改真实考试结束时间。
            re.setEndTime(DateUtils.getNowDate());
            updateRealExam(re);
            return AjaxResult.success("成功交卷！");
        } else {
            return AjaxResult.error("失败交卷！");
        }
    }

    /**
     * [轮询][学生]结束考试界面。
     *
     * @param examId
     * @return StudentRealExamPostVo
     */
    public AjaxResult studentLoopPostRealExam(Long examId) {
        RealExam re = selectRealExamByExamId(examId);
        StudentRealExamPostVo vo = new StudentRealExamPostVo();
        {

        }
        vo.setRealExam(re);
        vo.setListPart1(realExamFaultService.getReportListPart1(examId));
        vo.setListPart2(realExamFaultService.getReportListPart2(examId));
        vo.setPart3(realExamFaultService.getReportPart3(examId));
        return AjaxResult.success(vo);
    }
}