package com.klp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.klp.common.core.page.TableDataInfo;
import com.klp.common.core.domain.PageQuery;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.klp.common.utils.StringUtils;
import com.klp.domain.WmsActualWarehouse;
import com.klp.mapper.WmsActualWarehouseMapper;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;
import com.klp.domain.bo.WmsStockBo;
import com.klp.domain.vo.WmsStockVo;
import com.klp.domain.WmsStock;
import com.klp.domain.WmsWarehouse;
import com.klp.mapper.WmsStockMapper;
import com.klp.mapper.WmsWarehouseMapper;
import com.klp.service.IWmsStockService;

import java.math.BigDecimal;
import java.util.*;

/**
 * 库存：原材料/产品与库区/库位的存放关系Service业务层处理
 *
 * @author Joshi
 * @date 2025-07-18
 */
@RequiredArgsConstructor
@Service
public class WmsStockServiceImpl implements IWmsStockService {

    private final WmsStockMapper baseMapper;
    private final WmsWarehouseMapper warehouseMapper;
    private final WmsActualWarehouseMapper actualWarehouseMapper;


    /**
     * 查询库存：原材料/产品与库区/库位的存放关系
     */
    @Override
    public WmsStockVo queryById(Long stockId){
        return baseMapper.selectVoById(stockId);
    }

    /**
     * 查询库存：原材料/产品与库区/库位的存放关系列表
     */
    @Override
    public TableDataInfo<WmsStockVo> queryPageList(WmsStockBo bo, PageQuery pageQuery) {
        QueryWrapper<WmsStock> lqw = buildQueryWrapperPlus(bo);
        Page<WmsStockVo> result = baseMapper.selectVoPagePlus(pageQuery.build(), lqw);
        return TableDataInfo.build(result);
    }

    @Override
    public TableDataInfo<WmsStockVo> queryPageListActual(WmsStockBo bo, PageQuery pageQuery) {
        QueryWrapper<WmsStock> lqw = buildQueryWrapperPlusActual(bo);
        Page<WmsStockVo> result = baseMapper.selectVoPagePlusActual(pageQuery.build(), lqw);
        return TableDataInfo.build(result);
    }
    private QueryWrapper<WmsStock> buildQueryWrapperPlusActual(WmsStockBo bo) {  // 注意：这里改用 QueryWrapper 而非 LambdaQueryWrapper
        QueryWrapper<WmsStock> qw = Wrappers.query();  // 使用普通 QueryWrapper

        // 固定条件：未删除的现存数据
        qw.eq("mc.del_flag", 0);
        qw.eq("mc.data_type", 1);

        // 处理仓库ID查询，支持递归查询子节点
        if (bo.getActualWarehouseId() != null) {
            List<Long> warehouseIds = getActualWarehouseIdsWithChildren(bo.getActualWarehouseId());
            if (warehouseIds.size() == 1) {
                qw.eq("mc.actual_warehouse_id", warehouseIds.get(0));
            } else {
                qw.in("mc.actual_warehouse_id", warehouseIds);
            }
        }
        qw.eq(StringUtils.isNotBlank(bo.getItemType()), "mc.item_type", bo.getItemType());
        qw.eq(bo.getItemId() != null, "mc.item_id", bo.getItemId());
        qw.like(StringUtils.isNotBlank(bo.getBatchNo()), "mc.enter_coil_no", bo.getBatchNo());

        // 使用 groupBy 进行分组
        qw.groupBy(
                "mc.actual_warehouse_id",
                "mc.item_type",
                "mc.item_id",
                "w.actual_warehouse_name",
                "CASE WHEN mc.item_type = 'product' THEN p.product_name WHEN mc.item_type = 'raw_material' THEN r.raw_material_name ELSE NULL END",
                "CASE WHEN mc.item_type = 'product' THEN p.product_code WHEN mc.item_type = 'raw_material' THEN r.raw_material_code ELSE NULL END"
        );

        return qw;
    }

    private List<Long> getActualWarehouseIdsWithChildren(Long actualWarehouseId) {

        List<Long> actualWarehouseIds = new ArrayList<>();
        actualWarehouseIds.add(actualWarehouseId); // 添加当前仓库ID

        // 递归获取所有子仓库ID
        getChildActualWarehouseIds(actualWarehouseId,actualWarehouseIds);

        return actualWarehouseIds;
    }
    private void getChildActualWarehouseIds(Long parentId, List<Long> actualWarehouseIds) {
        // 查询直接子仓库
        List<WmsActualWarehouse> children = actualWarehouseMapper.selectList(
                Wrappers.<WmsActualWarehouse>lambdaQuery()
                        .eq(WmsActualWarehouse::getActualParentId, parentId)
                        .eq(WmsActualWarehouse::getDelFlag, 0)
        );

        // 递归处理每个子仓库
        for (WmsActualWarehouse child : children) {
            actualWarehouseIds.add(child.getActualWarehouseId());
            getChildActualWarehouseIds(child.getActualWarehouseId(), actualWarehouseIds);
        }
    }

    /**
     * 查询库存：原材料/产品与库区/库位的存放关系列表
     */
    @Override
    public List<WmsStockVo> queryList(WmsStockBo bo) {
        LambdaQueryWrapper<WmsStock> lqw = buildQueryWrapper(bo);
        return baseMapper.selectVoList(lqw);
    }
    private LambdaQueryWrapper<WmsStock> buildQueryWrapper(WmsStockBo bo) {
        LambdaQueryWrapper<WmsStock> lqw = new LambdaQueryWrapper<>();
        lqw.eq(StringUtils.isNotBlank(bo.getItemType()), WmsStock::getItemType, bo.getItemType());
        lqw.eq(bo.getItemId() != null, WmsStock::getItemId, bo.getItemId());
        lqw.eq(StringUtils.isNotBlank(bo.getBatchNo()), WmsStock::getBatchNo, bo.getBatchNo());
        return lqw;
    }

    private QueryWrapper<WmsStock> buildQueryWrapperPlus(WmsStockBo bo) {  // 注意：这里改用 QueryWrapper 而非 LambdaQueryWrapper
        QueryWrapper<WmsStock> qw = Wrappers.query();  // 使用普通 QueryWrapper

        // 固定条件：未删除的现存数据
        qw.eq("mc.del_flag", 0);
        qw.eq("mc.data_type", 1);

        // 处理仓库ID查询，支持递归查询子节点
        if (bo.getWarehouseId() != null) {
            List<Long> warehouseIds = getWarehouseIdsWithChildren(bo.getWarehouseId());
            if (warehouseIds.size() == 1) {
                qw.eq("mc.warehouse_id", warehouseIds.get(0));
            } else {
                qw.in("mc.warehouse_id", warehouseIds);
            }
        }

        qw.eq(StringUtils.isNotBlank(bo.getItemType()), "mc.item_type", bo.getItemType());
        qw.eq(bo.getItemId() != null, "mc.item_id", bo.getItemId());
        qw.like(StringUtils.isNotBlank(bo.getBatchNo()), "mc.enter_coil_no", bo.getBatchNo());

        // 使用 groupBy 进行分组
        qw.groupBy(
            "mc.warehouse_id",
            "mc.item_type",
            "mc.item_id",
            "w.warehouse_name",
            "CASE WHEN mc.item_type = 'product' THEN p.product_name WHEN mc.item_type = 'raw_material' THEN r.raw_material_name ELSE NULL END",
            "CASE WHEN mc.item_type = 'product' THEN p.product_code WHEN mc.item_type = 'raw_material' THEN r.raw_material_code ELSE NULL END"
        );

        return qw;
    }

    /**
     * 新增库存：原材料/产品与库区/库位的存放关系
     */
    @Override
    public Boolean insertByBo(WmsStockBo bo) {
        WmsStock add = BeanUtil.toBean(bo, WmsStock.class);
        validEntityBeforeSave(add);
        boolean flag = baseMapper.insert(add) > 0;
        if (flag) {
            bo.setStockId(add.getStockId());
        }
        return flag;
    }

    /**
     * 修改库存：原材料/产品与库区/库位的存放关系
     */
    @Override
    public Boolean updateByBo(WmsStockBo bo) {
        WmsStock update = BeanUtil.toBean(bo, WmsStock.class);
        validEntityBeforeSave(update);
        return baseMapper.updateById(update) > 0;
    }

    /**
     * 保存前的数据校验
     */
    private void validEntityBeforeSave(WmsStock entity){
        //TODO 做一些数据校验,如唯一约束
    }

    /**
     * 批量删除库存：原材料/产品与库区/库位的存放关系
     */
    @Override
    public Boolean deleteWithValidByIds(Collection<Long> ids, Boolean isValid) {
        if(isValid){
            //TODO 做一些业务上的校验,判断是否需要校验
        }
        return baseMapper.deleteBatchIds(ids) > 0;
    }

    @Override
    public BigDecimal getStockByItemId(Long rawMaterialId) {
        return baseMapper.getStockByItemId(rawMaterialId);
    }

    /**
     * 查询库存分布（按仓库统计）
     */
    @Override
    public WmsStockVo queryStockDistribution(WmsStockBo bo) {
        if (bo.getItemType() == null || bo.getItemId() == null) {
            throw new RuntimeException("物品类型和物品ID不能为空");
        }

        // 1. 计算总库存量
        BigDecimal totalQuantity = BigDecimal.ZERO;

        // 2. 按仓库统计库存分布
        List<WmsStockVo> distributionList = baseMapper.selectStockDistribution(bo.getItemType(), bo.getItemId());

        // 计算总量
        for (WmsStockVo vo : distributionList) {
            if (vo.getTotalQuantity() != null) {
                totalQuantity = totalQuantity.add(vo.getTotalQuantity());
            }
        }

        // 构建返回对象
        WmsStockVo result = new WmsStockVo();
        result.setItemType(bo.getItemType());
        result.setItemId(bo.getItemId());
        result.setTotalQuantity(totalQuantity);
        result.setStockDistribution(distributionList);

        return result;
    }



    /**
     * 获取指定仓库ID及其所有子仓库ID
     * @param warehouseId 仓库ID
     * @return 包含当前仓库ID和所有子仓库ID的列表
     */
    private List<Long> getWarehouseIdsWithChildren(Long warehouseId) {
        List<Long> warehouseIds = new ArrayList<>();
        warehouseIds.add(warehouseId); // 添加当前仓库ID

        // 递归获取所有子仓库ID
        getChildWarehouseIds(warehouseId, warehouseIds);

        return warehouseIds;
    }

    /**
     * 递归获取子仓库ID
     * @param parentId 父仓库ID
     * @param warehouseIds 仓库ID列表（用于收集结果）
     */
    private void getChildWarehouseIds(Long parentId, List<Long> warehouseIds) {
        // 查询直接子仓库
        List<WmsWarehouse> children = warehouseMapper.selectList(
            Wrappers.<WmsWarehouse>lambdaQuery()
                .eq(WmsWarehouse::getParentId, parentId)
                .eq(WmsWarehouse::getDelFlag, 0)
        );

        // 递归处理每个子仓库
        for (WmsWarehouse child : children) {
            warehouseIds.add(child.getWarehouseId());
            getChildWarehouseIds(child.getWarehouseId(), warehouseIds);
        }
    }
}