package com.klp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import com.klp.common.annotation.RepeatSubmit;
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.vo.WmsStockIoDetailVo;
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.domain.WmsStockIo;
import com.klp.mapper.WmsStockIoMapper;
import com.klp.service.IWmsStockIoService;
import com.klp.domain.WmsStockIoDetail;
import com.klp.domain.WmsStock;
import com.klp.mapper.WmsStockIoDetailMapper;
import com.klp.mapper.WmsStockMapper;
import org.springframework.transaction.annotation.Transactional;
import java.math.BigDecimal;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Collection;
import com.klp.common.exception.ServiceException;

/**
 * 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;

    /**
     * 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;
    }

    /**
     * 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.getBatchNo(), 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.getBatchNo(), 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.getBatchNo(), detail.getQuantity(), false, detail.getUnit());
                // 再增加目标库位
                changeStock(detail.getWarehouseId(), detail.getItemType(), detail.getItemId(), detail.getBatchNo(), 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);
        baseMapper.updateById(stockIo);
        return true;
    }

    /**
     * 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());
            } 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.getBatchNo(), 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.getBatchNo(), detail.getQuantity(), true, detail.getUnit());
                // 目标库位库存减少
                changeStock(detail.getWarehouseId(), detail.getItemType(), detail.getItemId(), detail.getBatchNo(), 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, String batchNo, 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(batchNo);
            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);
        }
    }
}