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

import com.zy.acs.manager.core.domain.TaskPosDto;
import com.zy.acs.manager.manager.entity.Code;
import com.zy.acs.manager.manager.entity.Segment;
import com.zy.acs.manager.manager.entity.Sta;
import com.zy.acs.manager.manager.enums.StaTypeType;
import com.zy.acs.manager.manager.service.*;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

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

// man_segment: start_time, end_time, alter table man_segment
//    add roller_waiting int(1) default 0 null comment '滚筒线等待' after end_time;
/**
 * alter table man_sta
 *     add capacity int null comment '槽位数' after angle;
 *
 * alter table man_sta
 *     add occ_cnt int null comment '占用数' after capacity;
 *
 * alter table man_sta
 *     add rsv_in_cnt int null comment '预约放货量' after occ_cnt;
 *
 * alter table man_sta
 *     add rsv_out_cnt int null comment '预约取货量' after rsv_in_cnt;
 */
@Slf4j
@Service
public class TransferStationHandler {

    private static final long LOAD_DELAY_MS  = 15000L; // load ( inbound ) delay timeout
    private static final long PLACE_DELAY_MS  = 15000L; // place ( outbound ) delay timeout

    @Autowired
    private SegmentService segmentService;
    @Autowired
    private AgvService agvService;
    @Autowired
    private AgvDetailService agvDetailService;
    @Autowired
    private CodeService codeService;
    @Autowired
    private StaService staService;

    /**
     * 取货（入库）：在取完第一个货的时候，担心滚筒输送线会有下一个货物，所以建议AGV在原地等待一段时间
     * 放货（出库）：可能此时AGV上面其他背篓的料箱也是出库到这个滚筒输送线，所以等输送线把第一个料箱运走之后，再放第二个
     * 要做 ready-for-next
     */
    public boolean hasDelayAtSta(Segment currSeg) {
        if (currSeg == null) {
            throw new NullPointerException("segment is null in hasDelayAtSta.");
        }
        // 判断AGV是否在滚动输送线前
        Code currentCode = agvDetailService.getCurrentCode(currSeg.getAgvId());
        if (null == currentCode) {
            return false;
        }
        Sta rollerSta = staService.selectByCode(currentCode.getId(), StaTypeType.ROLLER);
        if (null == rollerSta) {
            return false;
        }
        // 如果为第一个segment（没有previous segment），则不需要等待
        Segment preSeg = segmentService.getPreviousStepOfFinish(currSeg.getTravelId(), currSeg.getSerial());
        if (preSeg == null || null == preSeg.getEndTime()) {
            return false;
        }

        TaskPosDto.PosType currPosType = TaskPosDto.PosType.of(currSeg.getPosType());
        TaskPosDto.PosType prePosType = TaskPosDto.PosType.of(preSeg.getPosType());
        if (prePosType == null || currPosType == null) {
            return false;
        }
        long preEndTime = preSeg.getEndTime().getTime();
        long now = System.currentTimeMillis();
        Long agvId = currSeg.getAgvId();

        // inbound
        if (prePosType.equals(TaskPosDto.PosType.ORI_STA)) {

            // 背篓未满才等
            Integer backpack = agvService.getBackpack(agvId);
            List<Integer> usedBackpacks = segmentService.selectUsedBackpacks(currSeg.getTravelId(), agvId);
            if (usedBackpacks.size() >= backpack) {
                return false;
            }

            // sign waiting
            if (currSeg.getRollerWaiting() == 0) {
                currSeg.setRollerWaiting(1);
                segmentService.updateById(currSeg);
            }

            // timeout
            return (now - preEndTime) < LOAD_DELAY_MS;
        }

        // outbound
        if (prePosType == TaskPosDto.PosType.DEST_STA) {

            // 连续同口才等
            if (currPosType != TaskPosDto.PosType.DEST_STA) {
                return false;
            }
            if (!Objects.equals(preSeg.getEndNode(), currSeg.getEndNode())) {
                return false;
            }

            // sign waiting
            if (currSeg.getRollerWaiting() == 0) {
                currSeg.setRollerWaiting(1);
                segmentService.updateById(currSeg);
            }

            // timeout
            return (now - preEndTime) < PLACE_DELAY_MS;
        }

        return false;
    }

}