package com.wms.utils.storage;

import com.wms.constants.enums.LocationStatus;
import com.wms.entity.table.Location;
import com.wms.entity.table.Stock;
import com.wms.entity.table.Task;
import com.wms.mapper.LocationMapper;
import com.wms.mapper.StockMapper;
import com.wms.mapper.TaskMapper;
import lombok.RequiredArgsConstructor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.util.List;

/**
 * 库位工具类
 */
@Component
@RequiredArgsConstructor(onConstructor = @__(@Autowired))
public class LocationUtils {

    /**
     * 库存 Mapper
     */
    private final StockMapper stockMapper;

    /**
     * 库位 Mapper
     */
    private final LocationMapper locationMapper;

    /**
     * 任务mapper
     */
    private final TaskMapper taskMapper;

    /**
     * 获取一个区域的可用的库位
     * @param areaId 区域ID
     * @return 可用的库位排序
     */
    public List<Location> getNewLocation(Integer areaId) {
        Location query = new Location();
        query.setAreaId(areaId);
        query.setLocationStatus(LocationStatus.EMPTY.getCode());
        return locationMapper.selNextLocation(query);
    }

    /**
     * 在一堆空闲的库位中寻找一个可用的入库库位
     * @param canUseLocations 可用的库位
     * @return 可用的库位，若没有可用的库位则返回 null
     */
    public Location checkCanUse(List<Location> canUseLocations) {
        if(canUseLocations == null || canUseLocations.isEmpty()) {
            return null;
        }
        for (Location location : canUseLocations) {
            if(location.getDepth() == 1) {
                return location; // 1 深度的不需要检验
            }
            /* 校验此位置是否有遮挡 */ /* 如果这位置有库存（可能出现记错导致有库存），或者这位置其他深度（不论深度大小）有任务则不采用此位置 */
            /* 1 判断库存 */
            Stock checkStock = new Stock();
            checkStock.setLocationId(location.getLocationId());
            List<Stock> checkResult = stockMapper.selStocks(checkStock);
            if(!checkResult.isEmpty()) {
                continue; // 库存不为空，跳过
            }
            /* 2 判断同位置不同深度是否有任务 */
            // 找出此位置不同深度的库位
            Location queryDifferentDepthLocation = new Location();
            queryDifferentDepthLocation.setAreaId(location.getAreaId());
            queryDifferentDepthLocation.setEquipmentId(location.getEquipmentId());
            queryDifferentDepthLocation.setQueue(location.getQueue());
            queryDifferentDepthLocation.setLine(location.getLine());
            queryDifferentDepthLocation.setLayer(location.getLayer());
            List<Location> differentDepthLocations = locationMapper.selLocations(queryDifferentDepthLocation);
            if(differentDepthLocations == null) {
                continue; // 数据库查询失败
            }
            boolean canUse = false; // 指示当前库位是否可用，若可用会置成 true
            if(!differentDepthLocations.isEmpty()) {
                // 存在干涉库位，检验其是否有未完成的任务
                for (Location differentDepthLocation : differentDepthLocations) {
                    // 找出此位置不同深度的库位
                    Location queryLocationTask = new Location();
                    queryLocationTask.setLocationId(differentDepthLocation.getLocationId());
                    List<Task> locationTasks = taskMapper.haveNotCompleteTask(differentDepthLocation.getLocationId());
                    if(locationTasks == null) {
                        continue; // 数据库查询失败
                    }
                    if(!locationTasks.isEmpty()) {
                        break; // 有任务这个库位不行
                    }
                }
                canUse = true;
            }
            if(canUse) {
                return location;
            }
        }
        return null;
    }



}