package cn.iocoder.yudao.module.erp.service.purchase;

import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.util.StrUtil;
import cn.iocoder.yudao.framework.common.exception.ServiceException;
import cn.iocoder.yudao.framework.common.pojo.PageResult;
import cn.iocoder.yudao.framework.common.util.number.MoneyUtils;
import cn.iocoder.yudao.framework.common.util.object.BeanUtils;
import cn.iocoder.yudao.module.bpm.api.task.BpmProcessInstanceApi;
import cn.iocoder.yudao.module.bpm.api.task.dto.BpmProcessInstanceCreateReqDTO;
import cn.iocoder.yudao.module.bpm.enums.task.BpmTaskStatusEnum;
import cn.iocoder.yudao.module.erp.controller.admin.purchase.vo.request.ErpPurchaseRequestImportExcelVO;
import cn.iocoder.yudao.module.erp.controller.admin.purchase.vo.request.ErpPurchaseRequestImportReqVO;
import cn.iocoder.yudao.module.erp.controller.admin.purchase.vo.request.ErpPurchaseRequestImportRespVO;
import cn.iocoder.yudao.module.erp.controller.admin.purchase.vo.request.ErpPurchaseRequestPageReqVO;
import cn.iocoder.yudao.module.erp.controller.admin.purchase.vo.request.ErpPurchaseRequestSaveReqVO;
import cn.iocoder.yudao.module.erp.dal.dataobject.purchase.ErpPurchaseOrderDO;
import cn.iocoder.yudao.module.erp.dal.dataobject.purchase.ErpPurchaseOrderItemDO;
import cn.iocoder.yudao.module.erp.dal.dataobject.purchase.ErpPurchaseRequestDO;
import cn.iocoder.yudao.module.erp.dal.dataobject.purchase.ErpPurchaseRequestItemDO;
import cn.iocoder.yudao.module.erp.dal.dataobject.purchase.ErpSupplierDO;
import cn.iocoder.yudao.module.erp.dal.mysql.purchase.ErpPurchaseOrderItemMapper;
import cn.iocoder.yudao.module.erp.dal.mysql.purchase.ErpPurchaseOrderMapper;
import cn.iocoder.yudao.module.erp.dal.mysql.purchase.ErpPurchaseRequestItemMapper;
import cn.iocoder.yudao.module.erp.dal.mysql.purchase.ErpPurchaseRequestMapper;
import cn.iocoder.yudao.module.erp.dal.mysql.purchase.ErpSupplierMapper;
import cn.iocoder.yudao.module.erp.dal.redis.no.ErpNoRedisDAO;
import cn.iocoder.yudao.module.erp.enums.ErpPurchaseOrderStatusEnum;
import cn.iocoder.yudao.module.erp.enums.ErpPurchaseRequestStatusEnum;
import cn.iocoder.yudao.module.mdm.api.item.MdmItemApi;
import cn.iocoder.yudao.module.mdm.api.item.dto.MdmItemRespDTO;
import cn.iocoder.yudao.module.mdm.api.unit.MdmUnitMeasureApi;
import cn.iocoder.yudao.module.mdm.api.unit.dto.MdmUnitMeasureRespDTO;
import cn.iocoder.yudao.module.system.api.approval.ApprovalConfigApi;
import cn.iocoder.yudao.module.system.api.dept.DeptApi;
import cn.iocoder.yudao.module.system.api.storage.StorageAttachmentApi;
import cn.iocoder.yudao.module.system.api.user.AdminUserApi;
import cn.iocoder.yudao.module.system.api.user.dto.AdminUserRespDTO;
import jakarta.annotation.Resource;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.validation.annotation.Validated;

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

import static cn.iocoder.yudao.framework.common.exception.util.ServiceExceptionUtil.exception;
import static cn.iocoder.yudao.framework.common.util.collection.CollectionUtils.*;
import static cn.iocoder.yudao.framework.security.core.util.SecurityFrameworkUtils.getLoginUserId;
import static cn.iocoder.yudao.module.erp.enums.ErrorCodeConstants.*;

/**
 * ERP 采购申请 Service 实现类
 */
@Service
@Validated
@Slf4j
public class ErpPurchaseRequestServiceImpl implements ErpPurchaseRequestService {

    /**
     * 通用审批配置的业务类型编码（对应 system_approval_config.biz_type）
     */
    private static final String PURCHASE_REQUEST_APPROVE_BIZ_TYPE = "purchase_request_approve";

    /**
     * 采购申请审批的 BPM 流程定义 Key
     */
    private static final String PURCHASE_REQUEST_PROCESS_KEY = "purchase_request_approve";

    @Resource
    private ErpPurchaseRequestMapper purchaseRequestMapper;
    @Resource
    private ErpPurchaseRequestItemMapper purchaseRequestItemMapper;

    @Resource
    private ErpPurchaseOrderMapper purchaseOrderMapper;
    @Resource
    private ErpPurchaseOrderItemMapper purchaseOrderItemMapper;

    @Resource
    private ErpNoRedisDAO noRedisDAO;

    @Resource
    private ErpSupplierService supplierService;

    @Resource
    private ErpSupplierMapper supplierMapper;

    @Resource
    private MdmItemApi mdmItemApi;
    @Resource
    private MdmUnitMeasureApi mdmUnitMeasureApi;

    @Resource
    private ApprovalConfigApi approvalConfigApi;

    @Resource
    private BpmProcessInstanceApi bpmProcessInstanceApi;

    @Resource
    private AdminUserApi adminUserApi;
    @Resource
    private DeptApi deptApi;
    @Resource
    private StorageAttachmentApi storageAttachmentApi;

    @Override
    @Transactional(rollbackFor = Exception.class)
    public Long createPurchaseRequest(ErpPurchaseRequestSaveReqVO createReqVO) {
        // 1. 校验订单项的有效性
        List<ErpPurchaseRequestItemDO> requestItems = validatePurchaseRequestItems(createReqVO.getItems());
        // 2. 校验供应商（如果指定）
        if (createReqVO.getSupplierId() != null) {
            supplierService.validateSupplier(createReqVO.getSupplierId());
        }
        // 3. 生成申请单号
        String no = noRedisDAO.generate(ErpNoRedisDAO.PURCHASE_REQUEST_NO_PREFIX);
        if (purchaseRequestMapper.selectByNo(no) != null) {
            throw exception(PURCHASE_REQUEST_NO_EXISTS);
        }

        // 4. 获取当前用户信息
        Long userId = Long.parseLong(getCurrentUserId());
        AdminUserRespDTO user = adminUserApi.getUser(userId);
        Long deptId = user != null ? user.getDeptId() : null;

        // 5. 插入申请单
        ErpPurchaseRequestDO purchaseRequest = BeanUtils.toBean(createReqVO, ErpPurchaseRequestDO.class, req -> req
                .setNo(no)
                .setStatus(ErpPurchaseRequestStatusEnum.DRAFT.getStatus())
                .setRequestUserId(userId)
                .setRequestDeptId(deptId));
        // 兼容旧客户端未传定金的情况，数据库与业务层统一按 0 处理
        if (purchaseRequest.getDepositPrice() == null) {
            purchaseRequest.setDepositPrice(BigDecimal.ZERO);
        }
        calculateTotalPrice(purchaseRequest, requestItems);
        purchaseRequestMapper.insert(purchaseRequest);

        // 6. 绑定附件
        storageAttachmentApi.bindAttachments("file", "erp_purchase_request",
                purchaseRequest.getId(), createReqVO.getBlobIds());

        // 7. 插入申请明细
        requestItems.forEach(o -> o.setRequestId(purchaseRequest.getId()));
        purchaseRequestItemMapper.insertBatch(requestItems);

        return purchaseRequest.getId();
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void updatePurchaseRequest(ErpPurchaseRequestSaveReqVO updateReqVO) {
        // 1. 校验存在 + 草稿状态
        ErpPurchaseRequestDO purchaseRequest = validatePurchaseRequestCanModify(updateReqVO.getId());
        // 2. 校验供应商（如果指定）
        if (updateReqVO.getSupplierId() != null) {
            supplierService.validateSupplier(updateReqVO.getSupplierId());
        }
        // 3. 校验订单项的有效性
        List<ErpPurchaseRequestItemDO> requestItems = validatePurchaseRequestItems(updateReqVO.getItems());

        // 4. 更新申请单
        ErpPurchaseRequestDO updateObj = BeanUtils.toBean(updateReqVO, ErpPurchaseRequestDO.class);
        if (updateObj.getDepositPrice() == null) {
            updateObj.setDepositPrice(BigDecimal.ZERO);
        }
        calculateTotalPrice(updateObj, requestItems);
        purchaseRequestMapper.updateById(updateObj);

        // 5. 更新申请明细
        updatePurchaseRequestItemList(updateReqVO.getId(), requestItems);

        // 6. 更新附件
        storageAttachmentApi.updateAttachments("file", "erp_purchase_request", updateReqVO.getId(), updateReqVO.getBlobIds());
    }

    private void calculateTotalPrice(ErpPurchaseRequestDO purchaseRequest, List<ErpPurchaseRequestItemDO> requestItems) {
        purchaseRequest.setTotalCount(getSumValue(requestItems, ErpPurchaseRequestItemDO::getCount, BigDecimal::add));
        purchaseRequest.setTotalProductPrice(getSumValue(requestItems, ErpPurchaseRequestItemDO::getTotalPrice, BigDecimal::add, BigDecimal.ZERO));
        purchaseRequest.setTotalTaxPrice(getSumValue(requestItems, ErpPurchaseRequestItemDO::getTaxPrice, BigDecimal::add, BigDecimal.ZERO));
        purchaseRequest.setTotalPrice(purchaseRequest.getTotalProductPrice().add(purchaseRequest.getTotalTaxPrice()));
        // 计算优惠价格
        if (purchaseRequest.getDiscountPercent() == null) {
            purchaseRequest.setDiscountPercent(BigDecimal.ZERO);
        }
        purchaseRequest.setDiscountPrice(MoneyUtils.priceMultiplyPercent(purchaseRequest.getTotalPrice(), purchaseRequest.getDiscountPercent()));
        purchaseRequest.setTotalPrice(purchaseRequest.getTotalPrice().subtract(purchaseRequest.getDiscountPrice()));
    }

    private List<ErpPurchaseRequestItemDO> validatePurchaseRequestItems(List<ErpPurchaseRequestSaveReqVO.Item> list) {
        return convertList(list, o -> BeanUtils.toBean(o, ErpPurchaseRequestItemDO.class, item -> {
            if (item.getProductPrice() != null && item.getCount() != null) {
                item.setTotalPrice(MoneyUtils.priceMultiply(item.getProductPrice(), item.getCount()));
                if (item.getTaxPercent() != null) {
                    item.setTaxPrice(MoneyUtils.priceMultiplyPercent(item.getTotalPrice(), item.getTaxPercent()));
                }
            }
        }));
    }

    private void updatePurchaseRequestItemList(Long id, List<ErpPurchaseRequestItemDO> newList) {
        List<ErpPurchaseRequestItemDO> oldList = purchaseRequestItemMapper.selectListByRequestId(id);
        List<List<ErpPurchaseRequestItemDO>> diffList = diffList(oldList, newList,
                (oldVal, newVal) -> oldVal.getId().equals(newVal.getId()));

        if (CollUtil.isNotEmpty(diffList.get(0))) {
            diffList.get(0).forEach(o -> o.setRequestId(id));
            purchaseRequestItemMapper.insertBatch(diffList.get(0));
        }
        if (CollUtil.isNotEmpty(diffList.get(1))) {
            purchaseRequestItemMapper.updateBatch(diffList.get(1));
        }
        if (CollUtil.isNotEmpty(diffList.get(2))) {
            purchaseRequestItemMapper.deleteByIds(convertList(diffList.get(2), ErpPurchaseRequestItemDO::getId));
        }
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void deletePurchaseRequest(List<Long> ids) {
        List<ErpPurchaseRequestDO> purchaseRequests = purchaseRequestMapper.selectRequestListByIds(ids);
        if (CollUtil.isEmpty(purchaseRequests)) {
            return;
        }
        purchaseRequests.forEach(purchaseRequest -> {
            Integer status = purchaseRequest.getStatus();
            if (!ErpPurchaseRequestStatusEnum.DRAFT.getStatus().equals(status)
                    && !ErpPurchaseRequestStatusEnum.REJECT.getStatus().equals(status)) {
                throw exception(PURCHASE_REQUEST_DELETE_FAIL_NOT_DRAFT, purchaseRequest.getNo());
            }
        });

        purchaseRequests.forEach(purchaseRequest -> {
            storageAttachmentApi.deleteAttachmentsByRecord("erp_purchase_request", purchaseRequest.getId());
            purchaseRequestMapper.deleteById(purchaseRequest.getId());
            purchaseRequestItemMapper.deleteByRequestId(purchaseRequest.getId());
        });
    }

    @Override
    public ErpPurchaseRequestDO getPurchaseRequest(Long id) {
        return purchaseRequestMapper.selectById(id);
    }

    @Override
    public PageResult<ErpPurchaseRequestDO> getPurchaseRequestPage(ErpPurchaseRequestPageReqVO pageReqVO) {
        return purchaseRequestMapper.selectPage(pageReqVO);
    }

    @Override
    public List<ErpPurchaseRequestItemDO> getPurchaseRequestItemListByRequestId(Long requestId) {
        return purchaseRequestItemMapper.selectListByRequestId(requestId);
    }

    @Override
    public List<ErpPurchaseRequestItemDO> getPurchaseRequestItemListByRequestIds(Collection<Long> requestIds) {
        if (CollUtil.isEmpty(requestIds)) {
            return Collections.emptyList();
        }
        return purchaseRequestItemMapper.selectListByRequestIds(requestIds);
    }

    @Override
    public List<ErpPurchaseRequestDO> getPurchaseRequestList(List<Long> ids) {
        if (CollUtil.isEmpty(ids)) {
            return Collections.emptyList();
        }
        return purchaseRequestMapper.selectRequestListByIds(ids);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void submitPurchaseRequest(Long id) {
        // 1. 校验存在 + 可提交状态（未提交 / 审核不通过）
        ErpPurchaseRequestDO purchaseRequest = validatePurchaseRequestExists(id);
        if (!ErpPurchaseRequestStatusEnum.DRAFT.getStatus().equals(purchaseRequest.getStatus())
                && !ErpPurchaseRequestStatusEnum.REJECT.getStatus().equals(purchaseRequest.getStatus())) {
            throw exception(PURCHASE_REQUEST_SUBMIT_FAIL_NOT_ALLOWED);
        }
        // 2. 校验是否有明细
        List<ErpPurchaseRequestItemDO> items = purchaseRequestItemMapper.selectListByRequestId(id);
        if (CollUtil.isEmpty(items)) {
            throw exception(PURCHASE_REQUEST_ITEM_EMPTY);
        }
        // 3. 校验审批配置已启用且配置了有效审批人
        approvalConfigApi.validateApprovalEnabledAndGetApprovers(PURCHASE_REQUEST_APPROVE_BIZ_TYPE);
        // 4. 状态置为审批中，并清空上一轮审核结果
        if (purchaseRequestMapper.submitAndResetAuditInfo(id, ErpPurchaseRequestStatusEnum.PROCESS.getStatus()) != 1) {
            throw exception(PURCHASE_REQUEST_SUBMIT_FAIL_NOT_ALLOWED);
        }
        // 5. 创建 BPM 流程实例，使审批出现在「协同办公 - 我的流程」
        bpmProcessInstanceApi.createProcessInstance(getLoginUserId(),
                new BpmProcessInstanceCreateReqDTO()
                        .setProcessDefinitionKey(PURCHASE_REQUEST_PROCESS_KEY)
                        .setBusinessKey(String.valueOf(id)));
    }

    @Override
    public Set<Long> getPurchaseRequestApproverUserIds() {
        return approvalConfigApi.getApproverUserIds(PURCHASE_REQUEST_APPROVE_BIZ_TYPE);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void auditPurchaseRequest(Long id, Boolean pass, String reviewRemark) {
        // 1. 校验存在
        ErpPurchaseRequestDO purchaseRequest = validatePurchaseRequestExists(id);
        // 2. 校验处于审批中状态
        if (!ErpPurchaseRequestStatusEnum.PROCESS.getStatus().equals(purchaseRequest.getStatus())) {
            throw exception(PURCHASE_REQUEST_AUDIT_FAIL_NOT_PROCESS);
        }
        // 3. 校验当前登录用户是该业务类型的审批人（或签：任一人均可审核）
        Long userId = getLoginUserId();
        approvalConfigApi.validateApprover(PURCHASE_REQUEST_APPROVE_BIZ_TYPE, userId);
        // 4. 审核不通过：必须填写原因，退回申请人修改后可重新提交
        if (!Boolean.TRUE.equals(pass)) {
            if (StrUtil.isBlank(reviewRemark)) {
                throw exception(PURCHASE_REQUEST_AUDIT_REJECT_REASON_REQUIRED);
            }
            if (purchaseRequestMapper.auditPurchaseRequest(id, ErpPurchaseRequestStatusEnum.REJECT.getStatus(),
                    userId, getUserNickname(userId), reviewRemark) != 1) {
                throw exception(PURCHASE_REQUEST_AUDIT_FAIL_NOT_PROCESS);
            }
            return;
        }
        // 5. 审核通过：记录审核人与审核意见
        if (purchaseRequestMapper.auditPurchaseRequest(id, ErpPurchaseRequestStatusEnum.APPROVE.getStatus(),
                userId, getUserNickname(userId), reviewRemark) != 1) {
            throw exception(PURCHASE_REQUEST_AUDIT_FAIL_NOT_PROCESS);
        }
        // 6. 审核通过且有供应商、未生成订单时，自动生成采购订单
        if (purchaseRequest.getSupplierId() != null && purchaseRequest.getOrderId() == null) {
            try {
                Long orderId = doGeneratePurchaseOrder(purchaseRequest);
                log.info("[auditPurchaseRequest] 采购申请({}) 自动生成采购订单({})", id, orderId);
            } catch (Exception e) {
                // 不抛出异常，避免影响审核结果落库；生成失败可由用户手动触发
                log.error("[auditPurchaseRequest] 采购申请({}) 自动生成采购订单失败", id, e);
            }
        }
    }

    /**
     * 获取用户昵称
     *
     * @param userId 用户编号
     * @return 昵称，用户不存在时返回 null
     */
    private String getUserNickname(Long userId) {
        if (userId == null) {
            return null;
        }
        AdminUserRespDTO user = adminUserApi.getUser(userId);
        return user == null ? null : user.getNickname();
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void updatePurchaseRequestAuditStatus(Long id, Integer bpmStatus, String reason) {
        // 1. BPM 审批结果映射为采购申请状态：通过=20 / 不通过=30 / 取消=40
        Integer newStatus = convertBpmResultToStatus(bpmStatus);
        if (newStatus == null) {
            return;
        }
        // 2. 仅当仍处于「审批中」时回写，避免重复覆盖
        if (purchaseRequestMapper.updateAuditStatusByBpm(id, newStatus, reason) != 1) {
            log.warn("[updatePurchaseRequestAuditStatus] 采购申请({}) 不处于审批中状态，忽略 BPM 结果({})", id, bpmStatus);
            return;
        }
        // 3. 审批通过且有供应商、未生成订单时，自动生成采购订单
        if (!ErpPurchaseRequestStatusEnum.APPROVE.getStatus().equals(newStatus)) {
            return;
        }
        ErpPurchaseRequestDO purchaseRequest = purchaseRequestMapper.selectById(id);
        if (purchaseRequest == null || purchaseRequest.getSupplierId() == null
                || purchaseRequest.getOrderId() != null) {
            return;
        }
        try {
            Long orderId = doGeneratePurchaseOrder(purchaseRequest);
            log.info("[updatePurchaseRequestAuditStatus] 采购申请({}) 自动生成采购订单({})", id, orderId);
        } catch (Exception e) {
            // 不抛出异常，避免影响审批结果落库；生成失败可由用户手动触发
            log.error("[updatePurchaseRequestAuditStatus] 采购申请({}) 自动生成采购订单失败", id, e);
        }
    }

    /**
     * 转换 BPM 审批结果为采购申请状态
     */
    private Integer convertBpmResultToStatus(Integer bpmStatus) {
        if (BpmTaskStatusEnum.APPROVE.getStatus().equals(bpmStatus)) {
            return ErpPurchaseRequestStatusEnum.APPROVE.getStatus();
        }
        if (BpmTaskStatusEnum.REJECT.getStatus().equals(bpmStatus)) {
            return ErpPurchaseRequestStatusEnum.REJECT.getStatus();
        }
        if (BpmTaskStatusEnum.CANCEL.getStatus().equals(bpmStatus)) {
            return ErpPurchaseRequestStatusEnum.CANCEL.getStatus();
        }
        return null;
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public Long generatePurchaseOrder(Long id, Long supplierId) {
        // 1. 校验存在 + 审核通过状态
        ErpPurchaseRequestDO purchaseRequest = validatePurchaseRequestExists(id);
        if (!ErpPurchaseRequestStatusEnum.APPROVE.getStatus().equals(purchaseRequest.getStatus())) {
            throw exception(PURCHASE_REQUEST_NOT_APPROVE);
        }
        // 2. 校验是否已生成订单
        if (purchaseRequest.getOrderId() != null) {
            throw exception(PURCHASE_REQUEST_ORDER_EXISTS);
        }
        // 3. 校验供应商
        supplierService.validateSupplier(supplierId);

        // 4. 设置供应商并生成订单
        purchaseRequest.setSupplierId(supplierId);
        return doGeneratePurchaseOrder(purchaseRequest);
    }

    /**
     * 执行生成采购订单
     *
     * @param purchaseRequest 采购申请（需包含 supplierId）
     * @return 采购订单 ID
     */
    private Long doGeneratePurchaseOrder(ErpPurchaseRequestDO purchaseRequest) {
        Long id = purchaseRequest.getId();

        // 1. 获取申请明细
        List<ErpPurchaseRequestItemDO> requestItems = purchaseRequestItemMapper.selectListByRequestId(id);
        if (CollUtil.isEmpty(requestItems)) {
            throw exception(PURCHASE_REQUEST_NOT_EXISTS);
        }
        requestItems.forEach(item -> {
            if (item.getProductPrice() == null || item.getTotalPrice() == null || item.getTaxPrice() == null) {
                throw exception(PURCHASE_REQUEST_ITEM_PRICE_EMPTY, item.getId());
            }
        });

        // 2. 生成采购订单号
        String orderNo = noRedisDAO.generate(ErpNoRedisDAO.PURCHASE_ORDER_NO_PREFIX);
        if (purchaseOrderMapper.selectByNo(orderNo) != null) {
            throw exception(PURCHASE_ORDER_NO_EXISTS);
        }

        // 3. 创建采购订单
        ErpPurchaseOrderDO purchaseOrder = new ErpPurchaseOrderDO();
        purchaseOrder.setNo(orderNo);
        // 自动生成的采购订单仍为草稿，必须走订单自身的提交/审批流程，避免绕过审批
        purchaseOrder.setStatus(ErpPurchaseOrderStatusEnum.DRAFT.getStatus());
        purchaseOrder.setSupplierId(purchaseRequest.getSupplierId());
        purchaseOrder.setOrderTime(purchaseRequest.getRequestTime());
        purchaseOrder.setTotalCount(purchaseRequest.getTotalCount());
        purchaseOrder.setTotalPrice(purchaseRequest.getTotalPrice());
        purchaseOrder.setTotalProductPrice(purchaseRequest.getTotalProductPrice());
        purchaseOrder.setTotalTaxPrice(purchaseRequest.getTotalTaxPrice());
        purchaseOrder.setDiscountPercent(purchaseRequest.getDiscountPercent());
        purchaseOrder.setDiscountPrice(purchaseRequest.getDiscountPrice());
        purchaseOrder.setDepositPrice(purchaseRequest.getDepositPrice() != null ? purchaseRequest.getDepositPrice() : BigDecimal.ZERO);
        purchaseOrder.setRemark(purchaseRequest.getRemark());
        purchaseOrder.setInCount(BigDecimal.ZERO);
        purchaseOrder.setInStatus(0);
        purchaseOrderMapper.insert(purchaseOrder);

        // 4. 创建采购订单明细
        List<ErpPurchaseOrderItemDO> orderItems = convertList(requestItems, item -> {
            ErpPurchaseOrderItemDO orderItem = new ErpPurchaseOrderItemDO();
            orderItem.setOrderId(purchaseOrder.getId());
            orderItem.setRequestItemId(item.getId()); // 关联采购申请明细
            orderItem.setProductId(item.getProductId());
            orderItem.setProductUnitId(item.getProductUnitId());
            orderItem.setProductPrice(item.getProductPrice());
            orderItem.setCount(item.getCount());
            orderItem.setTotalPrice(item.getTotalPrice());
            orderItem.setTaxPercent(item.getTaxPercent());
            orderItem.setTaxPrice(item.getTaxPrice());
            orderItem.setRemark(item.getRemark());
            orderItem.setInCount(BigDecimal.ZERO);
            orderItem.setQcCheckFlag(item.getQcCheckFlag() != null ? item.getQcCheckFlag() : false);
            return orderItem;
        });
        purchaseOrderItemMapper.insertBatch(orderItems);

        // 5. 更新采购申请的订单信息，并回写最终使用的供应商
        purchaseRequestMapper.updateById(new ErpPurchaseRequestDO()
                .setId(id)
                .setSupplierId(purchaseRequest.getSupplierId())
                .setOrderId(purchaseOrder.getId())
                .setOrderNo(orderNo));

        return purchaseOrder.getId();
    }

    private ErpPurchaseRequestDO validatePurchaseRequestExists(Long id) {
        ErpPurchaseRequestDO purchaseRequest = purchaseRequestMapper.selectById(id);
        if (purchaseRequest == null) {
            throw exception(PURCHASE_REQUEST_NOT_EXISTS);
        }
        return purchaseRequest;
    }

    private ErpPurchaseRequestDO validatePurchaseRequestCanModify(Long id) {
        ErpPurchaseRequestDO purchaseRequest = validatePurchaseRequestExists(id);
        Integer status = purchaseRequest.getStatus();
        if (!ErpPurchaseRequestStatusEnum.DRAFT.getStatus().equals(status)
                && !ErpPurchaseRequestStatusEnum.REJECT.getStatus().equals(status)) {
            throw exception(PURCHASE_REQUEST_UPDATE_FAIL_NOT_DRAFT, purchaseRequest.getNo());
        }
        return purchaseRequest;
    }

    private String getCurrentUserId() {
        return cn.iocoder.yudao.framework.security.core.util.SecurityFrameworkUtils.getLoginUserId().toString();
    }

    @Override
    public ErpPurchaseRequestImportRespVO importPurchaseRequestList(List<ErpPurchaseRequestImportExcelVO> importRequests,
                                                                    ErpPurchaseRequestImportReqVO importReqVO) {
        if (Boolean.TRUE.equals(importReqVO.getUpdateSupport())) throw exception(PURCHASE_REQUEST_IMPORT_INVALID, "仅支持新增，不支持覆盖");
        if (CollUtil.isEmpty(importRequests)) {
            throw exception(PURCHASE_REQUEST_IMPORT_LIST_IS_EMPTY);
        }

        // 1. 逐行分类：有效行 / 被跳过的行。
        //    这里不再用 filterList 静默丢弃「物料编码为空」的行 —— 那会让用户看到「导入成功」
        //    但数据无声消失。被跳过的行必须带 Excel 原始行号返回给前端。
        ErpPurchaseRequestImportRespVO respVO = ErpPurchaseRequestImportRespVO.builder()
                .createPurchaseRequestNos(new ArrayList<>())
                .failurePurchaseRequestNos(new LinkedHashMap<>())
                .skippedRows(new LinkedHashMap<>())
                .build();
        List<ImportRow> validRows = new ArrayList<>();
        for (int i = 0; i < importRequests.size(); i++) {
            ErpPurchaseRequestImportExcelVO row = importRequests.get(i);
            int excelRowNo = i + 2; // +1 转 1 基，+1 跳过表头
            String rowLabel = "第" + excelRowNo + "行";
            // 1.1 完全空白的行（所有列都没有值）：Excel 常在末尾留空行，静默跳过即可
            if (isBlankRow(row)) {
                continue;
            }
            validRows.add(new ImportRow(excelRowNo, row));
        }
        respVO.setTotalRows(validRows.size() + respVO.getSkippedRows().size());
        if (CollUtil.isEmpty(validRows)) {
            // 没有任何一行可导入：直接报错。
            // 若是有行因「物料编码为空」被跳过，异常信息里带上行号，帮助用户定位。
            if (CollUtil.isNotEmpty(respVO.getSkippedRows())) {
                throw exception(PURCHASE_REQUEST_IMPORT_ALL_ROWS_SKIPPED,
                        String.join("、", respVO.getSkippedRows().keySet()));
            }
            throw exception(PURCHASE_REQUEST_IMPORT_LIST_IS_EMPTY);
        }

        // 2. 按「单号」分组：相同单号的多行合并成一张采购申请；单号为空时每行各自成一张申请
        List<List<ImportRow>> groups = new ArrayList<>();
        Map<String, Integer> groupIndexMap = new LinkedHashMap<>();
        for (ImportRow row : validRows) {
            String no = row.data.getNo();
            if (StrUtil.isBlank(no)) { groups.add(new ArrayList<>(Collections.singletonList(row))); continue; }
            String groupKey = no.trim();
            Integer index = groupIndexMap.get(groupKey);
            if (index == null) {
                index = groups.size();
                groupIndexMap.put(groupKey, index);
                groups.add(new ArrayList<>());
            }
            groups.get(index).add(row);
        }

        // 3. 逐组合并创建采购申请
        for (List<ImportRow> group : groups) {
            ImportRow firstRow = group.get(0);
            // 失败/跳过的标识优先用单号，没有单号则用 Excel 里的真实行号
            String groupKey = StrUtil.isNotBlank(firstRow.data.getNo())
                    ? firstRow.data.getNo() : "第" + firstRow.excelRowNo + "行";
            try {
                Long requestId = cn.hutool.extra.spring.SpringUtil.getBean(ErpPurchaseRequestServiceImpl.class)
                        .createImportedPurchaseRequest(convertList(group, ImportRow::getData));
                respVO.getCreatePurchaseRequestNos().add(purchaseRequestMapper.selectById(requestId).getNo());
                respVO.setSuccessRows(respVO.getSuccessRows() == null
                        ? group.size() : respVO.getSuccessRows() + group.size());
            } catch (ServiceException ex) {
                // 业务校验失败：记录原因，继续处理下一组
                respVO.getFailurePurchaseRequestNos().put(groupKey, ex.getMessage());
            } catch (Exception ex) {
                // 非业务异常（如远程调用 NPE、数据解析失败）：不能让整个导入 500，
                // 记录为失败并继续，保证其它能导的行正常入库
                log.error("[importPurchaseRequestList] 导入行({}) 发生非业务异常", groupKey, ex);
                respVO.getFailurePurchaseRequestNos().put(groupKey,
                        "导入失败，请检查基础资料和申请明细");
            }
        }
        return respVO;
    }

    /**
     * 判断一行是否完全空白（所有业务列都没有值）
     */
    private boolean isBlankRow(ErpPurchaseRequestImportExcelVO row) {
        return row == null || StrUtil.isBlank(row.getNo())
                && StrUtil.isBlank(row.getProductCode())
                && StrUtil.isBlank(row.getProductUnitCode())
                && row.getRequestTime() == null
                && row.getCount() == null
                && row.getProductPrice() == null
                && row.getDiscountPercent() == null && row.getDepositPrice() == null && row.getTaxPercent() == null
                && row.getDemandTime() == null && row.getQcCheckFlag() == null
                && StrUtil.isBlank(row.getSupplierName())
                && StrUtil.isBlank(row.getRequestReason())
                && StrUtil.isBlank(row.getRemark())
                && StrUtil.isBlank(row.getItemRemark());
    }

    /**
     * 导入行包装：携带 Excel 中的真实行号，用于错误提示定位。
     */
    private static class ImportRow {
        private final int excelRowNo;
        private final ErpPurchaseRequestImportExcelVO data;

        private ImportRow(int excelRowNo, ErpPurchaseRequestImportExcelVO data) {
            this.excelRowNo = excelRowNo;
            this.data = data;
        }

        private ErpPurchaseRequestImportExcelVO getData() {
            return data;
        }
    }

    /**
     * 将同一张采购申请的多行明细转换成创建 Request VO
     */
    @Transactional(rollbackFor = Exception.class)
    public Long createImportedPurchaseRequest(List<ErpPurchaseRequestImportExcelVO> group) {
        return createPurchaseRequest(buildPurchaseRequestImportSaveReqVO(group));
    }
    private ErpPurchaseRequestSaveReqVO buildPurchaseRequestImportSaveReqVO(List<ErpPurchaseRequestImportExcelVO> group) {
        ErpPurchaseRequestImportExcelVO first = group.get(0);
        // 1. 校验申请时间
        if (first.getRequestTime() == null) {
            throw exception(PURCHASE_REQUEST_IMPORT_REQUEST_TIME_REQUIRED);
        }
        if (first.getDiscountPercent() != null && (first.getDiscountPercent().signum() < 0 || first.getDiscountPercent().compareTo(new BigDecimal("100")) > 0)
                || first.getDepositPrice() != null && first.getDepositPrice().signum() < 0) {
            throw exception(PURCHASE_REQUEST_IMPORT_INVALID, "优惠率须在 0 至 100 之间，定金不能为负数");
        }
        for (ErpPurchaseRequestImportExcelVO row : group) {
            if (row.getRequestTime() != null && !row.getRequestTime().equals(first.getRequestTime())
                    || StrUtil.isNotBlank(row.getSupplierName()) && !StrUtil.equals(first.getSupplierName(), row.getSupplierName())
                    || StrUtil.isNotBlank(row.getRequestReason()) && !StrUtil.equals(first.getRequestReason(), row.getRequestReason())
                    || row.getDiscountPercent() != null && (first.getDiscountPercent() == null || row.getDiscountPercent().compareTo(first.getDiscountPercent()) != 0)
                    || row.getDepositPrice() != null && (first.getDepositPrice() == null || row.getDepositPrice().compareTo(first.getDepositPrice()) != 0)
                    || StrUtil.isNotBlank(row.getRemark()) && !StrUtil.equals(first.getRemark(), row.getRemark())) {
                throw exception(PURCHASE_REQUEST_IMPORT_INVALID, "同一申请单的主表信息不一致");
            }
            if (StrUtil.isBlank(row.getProductCode()) || StrUtil.isBlank(row.getProductUnitCode()) || row.getCount() == null || row.getCount().signum() <= 0
                    || row.getProductPrice() == null || row.getProductPrice().signum() < 0
                    || row.getTaxPercent() != null && (row.getTaxPercent().signum() < 0 || row.getTaxPercent().compareTo(new BigDecimal("100")) > 0)) {
                throw exception(PURCHASE_REQUEST_IMPORT_INVALID, "每行须填写物料、单位、正数数量、非负单价；税率须在 0 至 100 之间");
            }
        }
        // 2. 解析供应商（可选）
        Long supplierId = null;
        if (StrUtil.isNotBlank(first.getSupplierName())) {
            ErpSupplierDO supplier = supplierMapper.selectByName(first.getSupplierName());
            if (supplier == null) {
                throw exception(PURCHASE_REQUEST_IMPORT_SUPPLIER_NOT_EXISTS, first.getSupplierName());
            }
            supplierId = supplier.getId();
        }
        // 3. 组装明细
        List<ErpPurchaseRequestSaveReqVO.Item> items = new ArrayList<>();
        for (ErpPurchaseRequestImportExcelVO row : group) {
            MdmItemRespDTO product = mdmItemApi.getItemByCode(row.getProductCode().trim()).getCheckedData();
            if (product == null) {
                throw exception(PURCHASE_REQUEST_IMPORT_PRODUCT_NOT_EXISTS, row.getProductCode());
            }
            MdmUnitMeasureRespDTO unit = mdmUnitMeasureApi.getUnitMeasureByCode(row.getProductUnitCode().trim()).getCheckedData();
            if (unit == null) {
                throw exception(PURCHASE_REQUEST_IMPORT_UNIT_NOT_EXISTS, row.getProductUnitCode());
            }
            if (product.getStatus() != null && product.getStatus() != 0 || unit.getStatus() != null && unit.getStatus() != 0) {
                throw exception(PURCHASE_REQUEST_IMPORT_INVALID, "物料或计量单位已停用");
            }
            ErpPurchaseRequestSaveReqVO.Item item = new ErpPurchaseRequestSaveReqVO.Item()
                    .setProductId(product.getId())
                    .setProductUnitId(unit.getId())
                    .setProductPrice(row.getProductPrice())
                    .setCount(row.getCount())
                    .setTaxPercent(row.getTaxPercent())
                    .setDemandTime(row.getDemandTime())
                    .setQcCheckFlag(row.getQcCheckFlag())
                    .setRemark(row.getItemRemark());
            items.add(item);
        }
        // 4. 组装主表
        return new ErpPurchaseRequestSaveReqVO()
                .setRequestTime(first.getRequestTime())
                .setRequestReason(first.getRequestReason())
                .setSupplierId(supplierId)
                .setDiscountPercent(first.getDiscountPercent())
                .setDepositPrice(first.getDepositPrice())
                .setRemark(first.getRemark())
                .setItems(items);
    }

}