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.apache.commons.lang3.StringUtils;
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
    @Lazy
    private CommCheckService commCheckService;
    @Autowired
    private SimConfig simConfig;
    @Autowired
    private SocketService socketService;

    /**
     * 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
     */
    public int updateOneState(long examId, final String state) {
        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、训练、练习
     *
     * @param examId             考试Id
     * @param studentBindIp      考试学员IP
     * @param examCollectionType 考试集合类型
     * @return
     */
    public AjaxResult studentStartRealExam(final Long examId, final String studentBindIp, final String examCollectionType) {
        // Check:针对训练，进行特殊检查。
        if (StringUtils.equals(RealExamCollection.Type.EXERCISE, examCollectionType)) {
            // 已经open的考试。
            if (realExamCollectionService.existOpenedByType(RealExamCollection.Type.EXAM)) {
                return AjaxResult.error("存在打开的考试，无法开启训练！<br/>请向教员说明情况。");
            }
        }
        // Check:针对练习（自主练习），进行特殊检查。
        if (StringUtils.equals(RealExamCollection.Type.SELF_EXERCISE, examCollectionType)) {
            // 已经open的考试。
            if (realExamCollectionService.existOpenedByType(RealExamCollection.Type.EXAM)) {
                return AjaxResult.error("存在打开的考试，无法开启练习！<br/>请向教员说明情况。");
            }
            // 已经open的训练。
            if (realExamCollectionService.existOpenedByType(RealExamCollection.Type.EXERCISE)) {
                return AjaxResult.error("存在打开的训练，无法开启练习！<br/>请向教员说明情况。");
            }
        }
        // Check:检查参数examId有效性
        {
            AjaxResult ar = checkExamId(examId);
            if (ar.isError()) {
                return ar;
            }
        }
        RealExam re = selectRealExamByExamId(examId);
        // check:考试状态
        if (StringUtils.equals(re.getExamStatus(), RealExam.State.SUBMITTED) ||
                StringUtils.equals(re.getExamStatus(), RealExam.State.CALCULATING_SCORE) ||
                StringUtils.equals(re.getExamStatus(), RealExam.State.GOT_REPORT)) {
            return AjaxResult.error("已经交卷，禁止重复开始考试！");
        }
        RealExamCollection rec = realExamCollectionService.selectRealExamCollectionByExamCollectionId(re.getExamCollectionId());
        // Check:考试集合数据有效性。
        if (rec == null) {
            return AjaxResult.error("考试集合数据异常!");
        }
        if (!StringUtils.equals(rec.getExamCollectionState(), RealExamCollection.State.OPENED)) {
            return AjaxResult.error("教师端对应考试/训练尚未打开!<br/>请向教员说明情况。");
        }
        // Check:检查参数examCollectionType有效性
        if (!StringUtils.equals(examCollectionType, rec.getExamCollectionType())) {
            return AjaxResult.error("考试集合类型不对应!");
        }
        // Check:检查参数studentBindIp有效性
        if (StringUtils.isBlank(studentBindIp)) {
            return AjaxResult.error("IP地址无效");
        }
        Seat seat = seatService.uniqueByBindIp(studentBindIp);
        if (seat == null) {
            return AjaxResult.error("没有IP对应座次数据!");
        }
        // Check:ping通 路由器。
        {
            AjaxResult ar = commCheckService.checkRouterState(simConfig.getRouterIp());
            if (ar.isError()) {
                return ar;
            }
        }
        // Check:ping通 学员端电脑。
        if (false) {
            AjaxResult ar = commCheckService.checkPingStudentPcState(studentBindIp);
            if (ar.isError()) {
                return ar;
            }
        }
        // Check:ping通 RS485。
        {
            AjaxResult ar = commCheckService.checkPingRs485State(seat.getSeatRs485Ip());
            if (ar.isError()) {
                // todo:重复
                // 更新SimId
                seatService.updateCurrentSimIdBySeatNum(seat.getSeatNum(), Seat.ID_0);
                // 更新SocketState
                seatService.updateSocketStateBySeatNum(seat.getSeatNum(), Seat.SocketState.OFFLINE);
                return ar;
            } else {
                // Ping通不代表在线,Socket连接建立表示在线。
            }
        }
        // Check:如果有缓存Socket并且可用，使用缓存Socket，检查并建立Socket连接;否则返回对应错误。
        {
            AjaxResult ar = socketService.openOne(seat.toSimSocketParamVo());
            if (ar.isError()) {
                return ar;
            }
        }
        // Check:发送通用询问指令，询问是连接的哪种型号的哪一台模拟器;否则返回对应错误。
        {
            AjaxResult ar = commCheckService.checkOneSeatState(seat, true);
            l.debug("ar = {}", ar);
            // 没有连接模拟器。
            if (ar.get(AjaxResult.DATA_TAG) == null ||
                    !StringUtils.equals(((Sim) ar.get(AjaxResult.DATA_TAG)).getSimState(), Sim.State.ONLINE)) {
                return AjaxResult.error((String) ar.get(AjaxResult.MSG_TAG));
            }
            // 其他的异常情况。
            if (ar.isError()) {
                return ar;
            }
        }
        // Step:正式开始考试。锁定 座次 和 模拟器。
        // Step:重新查询。已经确定simId和simState了。
        {
            // 修改exam表对应examId的一条数据，填充并锁定seat_id和sim_id值。
            // 设置上seatId和simId
            re = selectRealExamByExamId(examId);
            seat = seatService.uniqueByBindIp(studentBindIp);
            l.debug("seat = {}", seat);
            re.setSeatId(seat.getSeatId());
            re.setSimId(seat.getCurrentSimId());
            updateRealExam(re);
        }
        // Check: seat_id 和 current_sim_id
        {
            RealExam re0001 = selectRealExamByExamId(examId);
            if (re0001 == null ||
                    re0001.getSeatId() == null ||
                    re0001.getSeatId() == 0L ||
                    re0001.getSimId() == null ||
                    re0001.getSimId() == 0) {
                return AjaxResult.error("开始考试异常!<br/>请刷新页面重试！");
            }
        }
        // Step:查询模拟器在线状态，纯DB查询。
        {
            AjaxResult ar = commCheckService.checkOneSimOnlineState(seat.getCurrentSimId());
            if (ar.isError()) {
                return ar;
            }
        }
        Sim sim = simService.selectSimBySimId(re.getSimId());
        // Check:检查模拟器类型
        final String targetSimType = re.getSimType();
        if (false) {
            AjaxResult ar = commCheckService.checkOneSimType(seat, true, targetSimType);
            if (ar.isError()) {
                return ar;
            }
        }
        // Step:可换件检查，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 ar = commSendService.readOneSimAllFaultCheck(seat, sim);
            if (ar.isError()) {
                return ar;
            }
        }
        // Step:清除对应一台模拟器 所有 真实的 故障部位故障。
        {
            commSendService.clearOneSimAllFaultByExam(re);
        }
        // Step:下发对应一台模拟器 出题选中的 故障位置故障。
        {
            commSendService.writeOneSimAllSelectFaultByExam(re);
        }
        // Step: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。
        {
            commSendService.readOneSimAllFaultFirstTimeByExam(re);
        }
        // Step:修改当前exam_id的考试状态。
        // 修改关联状态
        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("开始考试失败，<br/>请重新尝试开始考试!");
        }
    }


    public AjaxResult studentRefreshSimState(final String studentBindIp) {
        Seat seat = seatService.uniqueByBindIp(studentBindIp);
        // Check:Seat有效性。
        {
            if (seat == null) {
                return AjaxResult.error("没有IP对应座次数据!");
            }
        }
        return commCheckService.checkOneSeatState(seat, true);
    }


    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！");
        } else {
            return AjaxResult.success();
        }
    }

    /**
     * [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);
    }

    public static final Long DURATION_10_MIN = 1000L * 60 * 10;

    /**
     * [学生]交卷考试
     *
     * @param examId
     * @return RealExam
     */
    @Transactional
    public AjaxResult studentSubmitRealExam(final Long examId, final String studentBindIp, final String examCollectionType) {
        // Check:检查参数examId有效性
        {
            AjaxResult ar = checkExamId(examId);
            if (ar.isError()) {
                return ar;
            }
        }
        RealExam re = selectRealExamByExamId(examId);
        if (re == null ||
                re.getExamId() == 0L ||
                re.getSimId() == null ||
                re.getSimId() == 0L ||
                re.getExamCollectionId() == null ||
                re.getExamCollectionId() == 0L) {
            l.debug("RealExam = {}", re);
            return AjaxResult.error("交卷数据错误！");
        }
        if (re.getStartTime() == null) {
            return AjaxResult.error("考试开始时间异常！");
        }
        // check:考试状态
        if (StringUtils.equals(re.getExamStatus(), RealExam.State.SUBMITTED)) {
            return AjaxResult.error("已经交卷，禁止重复交卷，<br/>请刷新自动结束考试！");
        }
        RealExamCollection rec = realExamCollectionService.selectRealExamCollectionByExamCollectionId(re.getExamCollectionId());
        // 允许考试时长，毫秒
        Long millisecondsAllowed = rec.getLimitDuration() * 60 * 1000 + DURATION_10_MIN;
        // Check:已经超时的交卷。
        if (DateUtils.getNowDate().getTime() > re.getStartTime().getTime() + millisecondsAllowed) {
            // 修改考试状态
            re.setExamStatus(RealExam.State.SUBMITTED);
            // 修改真实考试结束时间。
            re.setEndTime(DateUtils.getNowDate());
            updateRealExam(re);
            return AjaxResult.success("考试时间已经超时，自动结束考试！");
        }

        // Check:检查参数studentBindIp有效性
        if (StringUtils.isBlank(studentBindIp)) {
            return AjaxResult.error("IP地址无效！");
        }
        // 现在交卷的座次
        Seat seatNow = seatService.uniqueByBindIp(studentBindIp);
        // 开始考试的座次
        Seat seatStart = seatService.selectSeatBySeatId(re.getSeatId());
        if (seatNow == null || seatStart == null) {
            return AjaxResult.error("没有IP对应座次数据!");
        }
        // Check:防止换座位交卷。
        if (!Objects.equals(seatStart.getSeatId(), seatNow.getSeatId())) {
            return AjaxResult.error("没有在原始座次上交卷，请回到原座次[" + seatStart.getSeatNum() + "]上进行交卷！");
        }

        // Check:检查参数examCollectionType有效性
        if (!StringUtils.equals(examCollectionType, rec.getExamCollectionType())) {
            return AjaxResult.error("考试集合类型不对应!");
        }
        // Check:ping通 RS485。
        {
            AjaxResult ar = commCheckService.checkPingRs485State(seatStart.getSeatRs485Ip());
            if (ar.isError()) {
                // todo:重复
                // 更新SimId
                seatService.updateCurrentSimIdBySeatNum(seatStart.getSeatNum(), Seat.ID_0);
                // 更新SocketState
                seatService.updateSocketStateBySeatNum(seatStart.getSeatNum(), Seat.SocketState.OFFLINE);
                return ar;
            } else {
                // Ping通不代表在线,Socket连接建立表示在线。
            }
        }
        // Check:如果有缓存Socket并且可用，使用缓存Socket，检查并建立Socket连接;否则返回对应错误。
        {
            AjaxResult ar = socketService.openOne(seatStart.toSimSocketParamVo());
            if (ar.isError()) {
                return ar;
            }
        }
        // Check:发送通用询问指令，询问是连接的哪种型号的哪一台模拟器;否则返回对应错误。
        {
            AjaxResult ar = commCheckService.checkOneSeatState(seatStart, true);
            if (ar.isError()) {
                return ar;
            }
        }
        // Step:查询模拟器在线状态，纯DB查询。
        {
            AjaxResult ar = commCheckService.checkOneSimOnlineState(seatStart.getCurrentSimId());
            if (ar.isError()) {
                return ar;
            }
        }
        // Check:检查是否是出题值使用的模拟器。防止换机器交卷。
        re = selectRealExamByExamId(examId);
        if (!Objects.equals(re.getSimId(), seatNow.getCurrentSimId())) {
            return AjaxResult.error("没有使用原始模拟器交卷，请使用模拟器[" +
                    simService.selectSimBySimId(re.getSimId()).getSimNum() +
                    "]进行交卷！");
        }
        // Check:检查考试状态
        if (StringUtils.equals(re.getExamStatus(), RealExam.State.SUBMITTED)) {
            return AjaxResult.success("已经成功交卷，跳过交卷！");
        }
        // todo:检查一下模拟器状态。


        // Check:检查换学生端交卷的情况。

        //


        // Step:最后读取一下模拟器电阻值。
        commSendService.readOneExamAtLast(re);
        // Step:
        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("交卷成功！");
        } else {
            return AjaxResult.error("交卷失败！考试数据不完整。");
        }
    }

    /**
     * [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);
    }

    /**
     * [学员]登录成功后调用
     *
     * @param userId
     * @param ip
     * @return
     */
    public AjaxResult studentLoginSuccess(final Long userId, final String ip) {
        
        return AjaxResult.success();
    }
}