package com.klp.service.impl;

import cn.hutool.core.bean.BeanUtil;
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.*;
import com.klp.domain.vo.WmsStockIoDetailVo;
import com.klp.mapper.*;
import lombok.RequiredArgsConstructor;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import com.klp.domain.bo.WmsStockIoBo;
import com.klp.domain.vo.WmsStockIoVo;
import com.klp.service.IWmsStockIoService;
import org.springframework.transaction.annotation.Transactional;
import java.math.BigDecimal;

import java.util.*;

import com.klp.common.exception.ServiceException;
import com.klp.domain.bo.WmsStockIoWithDetailBo;
import com.klp.domain.bo.WmsStockIoDetailBo;

import javax.annotation.Resource;

/**
 * 出入库单主Service业务层处理
 *
 * @author Joshi
 * @date 2025-07-18
 */
@RequiredArgsConstructor
@Service
public class WmsStockIoServiceImpl implements IWmsStockIoService {

    private final WmsStockIoMapper baseMapper;
    private final WmsStockIoDetailMapper stockIoDetailMapper;
    private final WmsStockMapper stockMapper;
    private final WmsProductMapper productMapper;
    private final WmsRawMaterialMapper rawMaterialMapper;
    private final WmsWarehouseMapper warehouseMapper;
    @Resource
    private WmsStockLogMapper stockLogMapper;

    /**
     * 查询出入库单主
     */
    @Override
    public WmsStockIoVo queryById(Long stockIoId){
        return baseMapper.selectVoById(stockIoId);
    }

    /**
     * 查询出入库单主列表
     */
    @Override
    public TableDataInfo<WmsStockIoVo> queryPageList(WmsStockIoBo bo, PageQuery pageQuery) {
        LambdaQueryWrapper<WmsStockIo> lqw = buildQueryWrapper(bo);
        Page<WmsStockIoVo> result = baseMapper.selectVoPage(pageQuery.build(), lqw);
        return TableDataInfo.build(result);
    }

    /**
     * 查询出入库单主列表
     */
    @Override
    public List<WmsStockIoVo> queryList(WmsStockIoBo bo) {
        LambdaQueryWrapper<WmsStockIo> lqw = buildQueryWrapper(bo);
        return baseMapper.selectVoList(lqw);
    }

    private LambdaQueryWrapper<WmsStockIo> buildQueryWrapper(WmsStockIoBo bo) {
        Map<String, Object> params = bo.getParams();
        LambdaQueryWrapper<WmsStockIo> lqw = Wrappers.lambdaQuery();
        lqw.eq(StringUtils.isNotBlank(bo.getStockIoCode()), WmsStockIo::getStockIoCode, bo.getStockIoCode());
        lqw.eq(StringUtils.isNotBlank(bo.getIoType()), WmsStockIo::getIoType, bo.getIoType());
        lqw.eq(StringUtils.isNotBlank(bo.getBizType()), WmsStockIo::getBizType, bo.getBizType());
        lqw.eq(bo.getStatus() != null, WmsStockIo::getStatus, bo.getStatus());
        return lqw;
    }

    /**
     * 新增出入库单主
     */
    @Override
    public Boolean insertByBo(WmsStockIoBo bo) {
        WmsStockIo add = BeanUtil.toBean(bo, WmsStockIo.class);
        validEntityBeforeSave(add);
        boolean flag = baseMapper.insert(add) > 0;
        if (flag) {
            bo.setStockIoId(add.getStockIoId());
        }
        return flag;
    }

    /**
     * 修改出入库单主
     */
    @Override
    public Boolean updateByBo(WmsStockIoBo bo) {
        WmsStockIo update = BeanUtil.toBean(bo, WmsStockIo.class);
        validEntityBeforeSave(update);
        return baseMapper.updateById(update) > 0;
    }

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

    /**
     * 批量删除出入库单主
     */
    @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;
    }

    /**
     * 批量新增主表和明细
     */
    @Override
    @Transactional(rollbackFor = Exception.class)
    public void addWithDetail(WmsStockIoWithDetailBo bo) {
        // 插入主表
        WmsStockIo stockIo = BeanUtil.toBean(bo, WmsStockIo.class);
        stockIo.setParentId(bo.getParentId());
        baseMapper.insert(stockIo);
        // 插入明细
        if (bo.getDetails() != null && !bo.getDetails().isEmpty()) {
            for (WmsStockIoDetailBo detailBo : bo.getDetails()) {
                WmsStockIoDetail detail = BeanUtil.toBean(detailBo, WmsStockIoDetail.class);
                detail.setStockIoId(stockIo.getStockIoId());
                stockIoDetailMapper.insert(detail);
            }
        }
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public boolean scanInStockByBo(WmsStockIoDetailBo bo) {
        String unit = bo.getUnit();
        // 如果unit为空，自动查item表补全
        if (unit == null || unit.trim().isEmpty()) {
            if ("product".equals(bo.getItemType())) {
                WmsProduct p = productMapper.selectById(bo.getItemId());
                unit = p != null ? p.getUnit() : null;
            } else if ("raw_material".equals(bo.getItemType())) {
                WmsRawMaterial r = rawMaterialMapper.selectById(bo.getItemId());
                unit = r != null ? r.getUnit() : null;
            }
        }
        if (unit == null || unit.trim().isEmpty()) {
            throw new RuntimeException("未能获取到单位");
        }
        // 入库操作
        changeStock(bo.getWarehouseId(), bo.getItemType(), bo.getItemId(), bo.getQuantity(), true, unit);
        return true;
    }
    @Override
    @Transactional(rollbackFor = Exception.class)
    public boolean scanOutStockByBo(WmsStockIoDetailBo bo) {
        String unit = bo.getUnit();
        // 如果unit为空，自动查item表补全
        if (unit == null || unit.trim().isEmpty()) {
            if ("product".equals(bo.getItemType())) {
                WmsProduct p = productMapper.selectById(bo.getItemId());
                unit = p != null ? p.getUnit() : null;
            } else if ("raw_material".equals(bo.getItemType())) {
                WmsRawMaterial r = rawMaterialMapper.selectById(bo.getItemId());
                unit = r != null ? r.getUnit() : null;
            }
        }
        if (unit == null || unit.trim().isEmpty()) {
            throw new RuntimeException("未能获取到单位");
        }
        // 出库操作
        changeStock(bo.getWarehouseId(), bo.getItemType(), bo.getItemId(), bo.getQuantity(), false, unit);
        return true;
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public boolean scanReturnStockByBo(WmsStockIoBo bo) {
        // 退库操作：根据主表ID查询明细列表，验证退库数量，执行退库
        if (bo.getStockIoId() == null) {
            throw new ServiceException("退库单ID不能为空");
        }

        // 1. 获取退库单主表信息
        WmsStockIo returnStockIo = baseMapper.selectById(bo.getStockIoId());
        if (returnStockIo == null || returnStockIo.getParentId() == null) {
            throw new ServiceException("退库单不存在或未关联原出库单");
        }

        // 2. 获取退库单明细列表
        List<WmsStockIoDetail> returnDetails = stockIoDetailMapper.selectList(
            Wrappers.<WmsStockIoDetail>lambdaQuery().eq(WmsStockIoDetail::getStockIoId, bo.getStockIoId())
        );

        if (returnDetails == null || returnDetails.isEmpty()) {
            throw new ServiceException("退库单明细不能为空");
        }

        // 3. 获取原出库单明细列表
        List<WmsStockIoDetail> originalOutDetails = stockIoDetailMapper.selectList(
            Wrappers.<WmsStockIoDetail>lambdaQuery().eq(WmsStockIoDetail::getStockIoId, returnStockIo.getParentId())
        );

        if (originalOutDetails == null || originalOutDetails.isEmpty()) {
            throw new ServiceException("原出库单明细不存在");
        }

        // 4. 遍历退库明细，验证数量并执行退库
        for (WmsStockIoDetail returnDetail : returnDetails) {
            // 查找对应的原出库明细
            WmsStockIoDetail originalOutDetail = originalOutDetails.stream()
                .filter(detail -> detail.getItemType().equals(returnDetail.getItemType()) &&
                                 detail.getItemId().equals(returnDetail.getItemId()) &&
                                 detail.getWarehouseId().equals(returnDetail.getWarehouseId()))
                .findFirst()
                .orElse(null);

            if (originalOutDetail == null) {
                throw new ServiceException("未找到对应的原出库明细：" + returnDetail.getItemType() + "-" + returnDetail.getItemId());
            }

            // 验证退库数量不能超过原出库数量
            BigDecimal totalReturnedQty = baseMapper.selectList(
                Wrappers.<WmsStockIo>lambdaQuery()
                    .eq(WmsStockIo::getParentId, returnStockIo.getParentId())
                    .eq(WmsStockIo::getIoType, "withdraw")
                    .ne(WmsStockIo::getStockIoId, returnStockIo.getStockIoId())
            ).stream()
            .flatMap(returnStockIoItem -> stockIoDetailMapper.selectList(
                Wrappers.<WmsStockIoDetail>lambdaQuery()
                    .eq(WmsStockIoDetail::getStockIoId, returnStockIoItem.getStockIoId())
                    .eq(WmsStockIoDetail::getItemType, returnDetail.getItemType())
                    .eq(WmsStockIoDetail::getItemId, returnDetail.getItemId())
                    .eq(WmsStockIoDetail::getWarehouseId, returnDetail.getWarehouseId())
            ).stream())
            .map(WmsStockIoDetail::getQuantity)
            .reduce(BigDecimal.ZERO, BigDecimal::add);

            BigDecimal remainingQty = originalOutDetail.getQuantity().subtract(totalReturnedQty);
            if (returnDetail.getQuantity().compareTo(remainingQty) > 0) {
                throw new ServiceException("退库数量超过原出库数量，物品：" + returnDetail.getItemType() + "-" + returnDetail.getItemId() +
                    "，原出库数量：" + originalOutDetail.getQuantity() + "，已退库数量：" + totalReturnedQty +
                    "，剩余可退数量：" + remainingQty + "，本次退库数量：" + returnDetail.getQuantity());
            }

            // 执行退库操作（增加库存）
            String unit = returnDetail.getUnit();
            if (unit == null || unit.trim().isEmpty()) {
                if ("product".equals(returnDetail.getItemType())) {
                    WmsProduct p = productMapper.selectById(returnDetail.getItemId());
                    unit = p != null ? p.getUnit() : "个";
                } else if ("raw_material".equals(returnDetail.getItemType())) {
                    WmsRawMaterial r = rawMaterialMapper.selectById(returnDetail.getItemId());
                    unit = r != null ? r.getUnit() : "个";
                }
            }

            // 执行入库操作（退库就是入库）
            changeStock(returnDetail.getWarehouseId(), returnDetail.getItemType(),
                       returnDetail.getItemId(), returnDetail.getQuantity(), true, unit);
        }
        // 更新单据状态为已审核（2）
        returnStockIo.setStatus(2);
        return baseMapper.updateById(returnStockIo) > 0;
    }


    /**
     * 审核出入库/移库单，变更库存，含库存校验
     */
    @Override
    @Transactional(rollbackFor = Exception.class)
    public Boolean auditStockIo(Long stockIoId) {
        WmsStockIo stockIo = baseMapper.selectById(stockIoId);
        if (stockIo == null || stockIo.getStatus() == null || stockIo.getStatus() != 1) {
            // 只允许审核“已提交”状态的单据
            throw new RuntimeException("单据不存在或状态不允许审核");
        }
        List<WmsStockIoDetail> details = stockIoDetailMapper.selectList(
            Wrappers.<WmsStockIoDetail>lambdaQuery().eq(WmsStockIoDetail::getStockIoId, stockIoId)
        );
        if (details == null || details.isEmpty()) {
            throw new RuntimeException("单据明细不能为空");
        }
        for (WmsStockIoDetail detail : details) {
            String ioType = stockIo.getIoType();
            if ("in".equals(ioType)) {
                // 入库：目标库位库存增加
                changeStock(detail.getWarehouseId(), detail.getItemType(), detail.getItemId(),  detail.getQuantity(), true, detail.getUnit());
            } else if ("out".equals(ioType)) {
                // 出库：目标库位库存减少
                changeStock(detail.getWarehouseId(), detail.getItemType(), detail.getItemId(), detail.getQuantity(), false, detail.getUnit());
            } else if ("transfer".equals(ioType)) {
                // 移库：fromWarehouseId减少，warehouseId增加
                if (detail.getFromWarehouseId() == null) {
                    throw new RuntimeException("移库明细缺少源库位ID");
                }
                // 先减少源库位
                changeStock(detail.getFromWarehouseId(), detail.getItemType(), detail.getItemId(),  detail.getQuantity(), false, detail.getUnit());
                // 再增加目标库位
                changeStock(detail.getWarehouseId(), detail.getItemType(), detail.getItemId(),  detail.getQuantity(), true, detail.getUnit());
            } else {
                throw new RuntimeException("未知的出入库类型");
            }
        }
        // 更新单据状态为已审核（2）
        stockIo.setStatus(2);
        return baseMapper.updateById(stockIo) > 0;
    }

    /**
     * 撤销出入库/移库单，库存回滚
     */
    @Override
    @Transactional(rollbackFor = Exception.class)
    public Boolean cancelStockIo(Long stockIoId) {
        WmsStockIo stockIo = baseMapper.selectById(stockIoId);
        if (stockIo == null || stockIo.getStatus() == null || stockIo.getStatus() != 2) {
            throw new ServiceException("只能撤销已审核的单据");
        }
        List<WmsStockIoDetail> details = stockIoDetailMapper.selectList(
            Wrappers.<WmsStockIoDetail>lambdaQuery().eq(WmsStockIoDetail::getStockIoId, stockIoId)
        );
        if (details == null || details.isEmpty()) {
            throw new ServiceException("单据明细不能为空");
        }
        for (WmsStockIoDetail detail : details) {
            String ioType = stockIo.getIoType();
            if ("in".equals(ioType)) {
                // 入库撤销：目标库位库存减少
//                changeStock(detail.getWarehouseId(), detail.getItemType(), detail.getItemId(), detail.getBatchNo(), detail.getQuantity(), false, detail.getUnit());
                changeStock(detail.getWarehouseId(), detail.getItemType(), detail.getItemId(), detail.getQuantity(), false, detail.getUnit());
            } else if ("out".equals(ioType)) {
                // 出库撤销：目标库位库存增加
                changeStock(detail.getWarehouseId(), detail.getItemType(), detail.getItemId(), detail.getQuantity(), true, detail.getUnit());
            } else if ("transfer".equals(ioType)) {
                if (detail.getFromWarehouseId() == null) {
                    throw new ServiceException("移库明细缺少源库位ID");
                }
                // 源库位库存增加
                changeStock(detail.getFromWarehouseId(), detail.getItemType(), detail.getItemId(), detail.getQuantity(), true, detail.getUnit());
                // 目标库位库存减少
                changeStock(detail.getWarehouseId(), detail.getItemType(), detail.getItemId(),  detail.getQuantity(), false, detail.getUnit());
            } else {
                throw new ServiceException("未知的出入库类型");
            }
        }
        // 更新单据状态为待审核（1）
        stockIo.setStatus(1);
        baseMapper.updateById(stockIo);
        return true;
    }

    /**
     * 根据ioType和stockIoId联查明细
     */
    @Override
    public List<WmsStockIoDetailVo> detailByTypeAndId(String ioType, Long stockIoId) {
        WmsStockIo stockIo = baseMapper.selectById(stockIoId);
        if (stockIo == null) {
            throw new ServiceException("单据不存在");
        }
        if (!ioType.equals(stockIo.getIoType())) {
            throw new ServiceException("单据类型不匹配");
        }
        List<WmsStockIoDetail> details = stockIoDetailMapper.selectList(
            Wrappers.<WmsStockIoDetail>lambdaQuery().eq(WmsStockIoDetail::getStockIoId, stockIoId)
        );
        if (details == null || details.isEmpty()) {
            return java.util.Collections.emptyList();
        }
        // 转VO
        List<WmsStockIoDetailVo> voList = new ArrayList<>();
        for (WmsStockIoDetail detail : details) {
            WmsStockIoDetailVo vo = new WmsStockIoDetailVo();
            BeanUtils.copyProperties(detail, vo);
            voList.add(vo);
        }
        return voList;
    }

    /**
     * 更新出入库单状态
     */
    @Override
    public Boolean updateStatus(Long stockIoId, Integer status) {
        WmsStockIo stockIo = baseMapper.selectById(stockIoId);
        if (stockIo == null) {
            throw new ServiceException("单据不存在");
        }

        // 状态流转验证
        if (stockIo.getStatus() == 0 && status == 1) {
            // 草稿 -> 已提交：需要检查是否有明细
            List<WmsStockIoDetail> details = stockIoDetailMapper.selectList(
                Wrappers.<WmsStockIoDetail>lambdaQuery().eq(WmsStockIoDetail::getStockIoId, stockIoId)
            );
            if (details == null || details.isEmpty()) {
                throw new ServiceException("单据明细不能为空，无法提交");
            }
        } else if (stockIo.getStatus() == 1 && status == 0) {
            // 已提交 -> 草稿：允许回退
        } else {
            throw new ServiceException("状态流转不允许");
        }

        stockIo.setStatus(status);
        return baseMapper.updateById(stockIo) > 0;
    }

    /**
     * 库存增减，isAdd=true为增加，false为减少，减少时校验库存是否足够
     */
    private void changeStock(Long warehouseId, String itemType, Long itemId, BigDecimal quantity, boolean isAdd, String unit) {
        WmsStock stock = stockMapper.selectOne(Wrappers.<WmsStock>lambdaQuery()
            .eq(WmsStock::getWarehouseId, warehouseId)
            .eq(WmsStock::getItemType, itemType)
            .eq(WmsStock::getItemId, itemId)
//            .eq(WmsStock::getBatchNo, batchNo)
            .last("limit 1"));
        if (stock == null) {
            if (!isAdd) {
                throw new RuntimeException("库存不足，无法出库/移库");
            }
            // 新增库存记录
            stock = new WmsStock();
            stock.setWarehouseId(warehouseId);
            stock.setItemType(itemType);
            stock.setItemId(itemId);
            stock.setBatchNo("B-100");
            stock.setQuantity(quantity);
            stock.setUnit(unit);
            stockMapper.insert(stock);
        } else {
            BigDecimal newQty = isAdd ? stock.getQuantity().add(quantity) : stock.getQuantity().subtract(quantity);
            if (newQty.compareTo(BigDecimal.ZERO) < 0) {
                throw new RuntimeException("库存不足，无法出库/移库");
            }
            stock.setQuantity(newQty);
            stockMapper.updateById(stock);
        }
        // 记录库存变更日志
        WmsStockLog log = new WmsStockLog();
        log.setWarehouseId(warehouseId);
        log.setItemType(itemType);
        log.setItemId(itemId);
        // 变动数量（正=入库，负=出库）
        log.setChangeQty(isAdd ? quantity : quantity.negate());
        // 变动后的库存数量
        log.setAfterQty(stock.getQuantity());
        // 变动类型（入库/出库等）
        log.setChangeType(isAdd ? "入库" : "出库");
        log.setChangeTime(new Date());
        stockLogMapper.insert(log);
    }
}