package com.zy.acs.manager.manager.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.zy.acs.framework.common.Cools;
import com.zy.acs.manager.common.exception.BusinessException;
import com.zy.acs.manager.manager.entity.Sta;
import com.zy.acs.manager.manager.entity.StaReserve;
import com.zy.acs.manager.manager.entity.Task;
import com.zy.acs.manager.manager.enums.StaReserveStateType;
import com.zy.acs.manager.manager.enums.StaReserveType;
import com.zy.acs.manager.manager.enums.StatusType;
import com.zy.acs.manager.manager.mapper.StaMapper;
import com.zy.acs.manager.manager.mapper.StaReserveMapper;
import com.zy.acs.manager.manager.service.StaReserveService;
import com.zy.acs.manager.manager.service.StaService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.Date;
import java.util.List;
import java.util.Objects;
import java.util.Optional;

@Service("staReserveService")
public class StaReserveServiceImpl extends ServiceImpl<StaReserveMapper, StaReserve> implements StaReserveService {

    public static final Long RESERVE_EXPIRE_TIME = 30 * 60 * 1000L;
    public static final Long WAITING_EXPIRE_TIME = 5 * 60 * 1000L;

    public static final Integer DEFAULT_QTY = 1;

    @Autowired
    private StaService staService;
    @Autowired
    private StaMapper staMapper;

    @Override
    @Transactional(rollbackFor = Exception.class)
    public StaReserve reserveStaIn(Sta sta, Task task, Integer qty) {
        qty = Optional.ofNullable(qty).orElse(DEFAULT_QTY);

        // reserve sta in
        if (staMapper.tryReserveIn(sta.getId(), qty) < qty) {
            throw new BusinessException("Sta[" + sta.getStaNo() + "] can't reserve IN");
        }
        Date now = new Date();

        // save staReserve
        StaReserve reserve = new StaReserve();
        reserve.setStaId(sta.getId());
        reserve.setTaskId(task.getId());
        reserve.setType(StaReserveType.IN.toString());
        reserve.setQty(qty);
        reserve.setState(StaReserveStateType.RESERVED.toString());

        reserve.setUniqKey(this.generateReserveUniqKey(sta.getId(), task.getId(), StaReserveType.IN));
        reserve.setExpireTime(new Date(now.getTime() + RESERVE_EXPIRE_TIME));

        reserve.setStatus(StatusType.ENABLE.val);
        reserve.setCreateTime(now);
        reserve.setUpdateTime(now);

        if (!this.save(reserve)) {
            staMapper.releaseReserveIn(sta.getId(), qty);
            throw new BusinessException("reserve record insert failed");
        }

        return reserve;
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public StaReserve reserveStaOut(Sta sta, Task task, Integer qty) {
        qty = Optional.ofNullable(qty).orElse(DEFAULT_QTY);

        // reserve sta out
        if (staMapper.tryReserveOut(sta.getId(), qty) < qty) {
            throw new BusinessException("Sta[" + sta.getStaNo() + "] can't reserve OUT");
        }

        Date now = new Date();

        // save staReserve
        StaReserve reserve = new StaReserve();
        reserve.setStaId(sta.getId());
        reserve.setTaskId(task.getId());
        reserve.setType(StaReserveType.OUT.toString());
        reserve.setQty(qty);
        reserve.setState(StaReserveStateType.RESERVED.toString());

        reserve.setUniqKey(this.generateReserveUniqKey(sta.getId(), task.getId(), StaReserveType.OUT));
        reserve.setExpireTime(new Date(now.getTime() + RESERVE_EXPIRE_TIME));

        reserve.setStatus(StatusType.ENABLE.val);
        reserve.setCreateTime(now);
        reserve.setUpdateTime(now);

        if (!this.save(reserve)) {
            staMapper.releaseReserveOut(sta.getId(), qty);
            throw new BusinessException("reserve record insert failed");
        }

        return reserve;
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public Boolean waitingStaReserve(Sta sta, Task task, Integer qty, StaReserveType type) {
        qty = Optional.ofNullable(qty).orElse(DEFAULT_QTY);

        // update reserve to be waiting state
        int changed = this.baseMapper.updateStateToWaiting(task.getId()
                , sta.getId()
                , type.toString()
                , StaReserveStateType.WAITING.toString()
                , WAITING_EXPIRE_TIME
        );
        if (changed > 0) {
            return true;
        }

        List<StaReserve> list = this.list(new LambdaQueryWrapper<StaReserve>()
                .eq(StaReserve::getStaId, sta.getId())
                .eq(StaReserve::getTaskId, task.getId())
                .eq(StaReserve::getType, type.toString())
                .eq(StaReserve::getStatus, StatusType.ENABLE.val)
        );

        if (Cools.isEmpty(list)) {
            return false;
        }
        StaReserve reserve = list.get(0);

        StaReserveStateType stateType = StaReserveStateType.of(reserve.getState());
        switch (Objects.requireNonNull(stateType)) {
            case WAITING:
            case CONFIRMED:
                return true;
            default:
                return false;
        }
    }

    @Override
    public Boolean rollbackWaitingToReserved(Sta sta, Task task, StaReserveType type) {
        int changed = this.baseMapper.updateStateBackToWaiting(
                task.getId()
                , sta.getId()
                , type.toString()
                , StaReserveStateType.RESERVED.toString()
                , WAITING_EXPIRE_TIME
        );
        return changed > 0;
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void confirmStaReserve(Sta sta, Task task, Integer qty, StaReserveType type) {
        qty = Optional.ofNullable(qty).orElse(DEFAULT_QTY);

        // update reserve state to be confirmed
        if (0 == this.baseMapper.updateState(task.getId(), sta.getId(), type.toString(), StaReserveStateType.CONFIRMED.toString())) {
            log.error("failed to confirm sta reserve");
            return;
        }

        int cntOfDealWithReserve = 0;
        switch (type) {
            case IN:
                cntOfDealWithReserve = staMapper.confirmReserveIn(sta.getId(), qty);
                break;
            case OUT:
                cntOfDealWithReserve = staMapper.confirmReserveOut(sta.getId(), qty);
                break;
            default:
                break;
        }
        if (cntOfDealWithReserve == 0) {
            throw new BusinessException("Sta[" + sta.getStaNo() + "] confirm failed, type=" + type.toString());
        }
    }

    @Override
    public void cancelStaReserve(Sta sta, Task task, Integer qty, StaReserveType type) {
        qty = Optional.ofNullable(qty).orElse(DEFAULT_QTY);

        // update reserve state to be canceled
        if (0 == this.baseMapper.updateState(task.getId(), sta.getId(), type.toString(), StaReserveStateType.CANCELLED.toString())) {
            log.error("failed to cancel sta reserve");
            return;
        }

        int cntOfDealWithReserve = 0;
        switch (type) {
            case IN:
                cntOfDealWithReserve = staMapper.releaseReserveIn(sta.getId(), qty);
                break;
            case OUT:
                cntOfDealWithReserve = staMapper.releaseReserveOut(sta.getId(), qty);
                break;
            default:
                break;
        }
        if (cntOfDealWithReserve == 0) {
            throw new BusinessException("Sta[" + sta.getStaNo() + "] cancel failed, type=" + type.toString());
        }
    }


    private String generateReserveUniqKey(Long staId, Long taskId, StaReserveType type) {
        return "STA:" + staId + "-TASK:" + taskId + "-T:" + type.toString();
    }

}