跨境电商三大模式深度解析：品牌直发、跨境直邮、全球小包的运作机制

/**
 * 品牌直发模式 - 系统架构
 */

// 1. 电商平台订单系统
@Service
public class BrandDirectOrderService {

    @Autowired
    private BrandStoreApiClient brandStoreClient;

    @Autowired
    private CustomsApiClient customsClient;

    /**
     * 用户下单后的处理流程
     */
    @Transactional
    public void createBrandDirectOrder(OrderCreateRequest request) {
        // 1. 创建订单
        Order order = Order.builder()
            .orderNo(generateOrderNo())
            .userId(request.getUserId())
            .storeType("BRAND_DIRECT")  // 品牌直发
            .warehouseLocation("JP")    // 日本发货
            .estimatedDeliveryDays(10)  // 预计10天
            .build();
        orderRepository.save(order);

        // 2. 推送订单到海关（订单主责任）
        customsClient.submitOrder(order);

        // 3. 推送订单到品牌方系统（异步）
        // 品牌方收到订单后，自行安排发货
        CompletableFuture.runAsync(() -> {
            BrandOrderMessage message = BrandOrderMessage.builder()
                .platformOrderNo(order.getOrderNo())
                .skuCode(request.getSkuCode())
                .quantity(request.getQuantity())
                .consignee(order.getConsignee())
                .address(order.getAddress())
                .phone(order.getPhone())
                .build();

            // 调用品牌方提供的API
            BrandOrderResponse response = brandStoreClient.pushOrder(message);

            // 保存品牌方订单号
            order.setBrandOrderNo(response.getBrandOrderNo());
            orderRepository.save(order);
        });

        // 4. 更新订单状态为"等待品牌方发货"
        order.setStatus("WAITING_BRAND_SHIP");
        orderRepository.save(order);
    }

    /**
     * 接收品牌方发货通知（回调接口）
     */
    @PostMapping("/api/brand/callback/shipped")
    public ApiResponse onBrandShipped(@RequestBody BrandShipNotification notification) {
        // 1. 查询订单
        Order order = orderRepository.findByBrandOrderNo(notification.getBrandOrderNo());

        // 2. 更新物流信息
        order.setLogisticsNo(notification.getTrackingNo());
        order.setLogisticsCompany(notification.getCarrier());  // DHL/FedEx
        order.setStatus("SHIPPED");
        order.setShippedTime(LocalDateTime.now());
        orderRepository.save(order);

        // 3. 品牌方推送物流单到海关（运单主责任）
        // 注意：品牌方需要自己对接海关接口
        // 平台只负责推送订单

        // 4. 发送发货通知给用户
        notificationService.sendShippedNotification(order);

        return ApiResponse.success();
    }
}

/**
 * 品牌方ERP系统
 * 戴森日本公司的订单处理系统
 */
@Service
public class BrandErpService {

    @Autowired
    private BrandWarehouseService warehouseService;

    @Autowired
    private InternationalLogisticsService logisticsService;

    @Autowired
    private ChinaCustomsClient customsClient;

    /**
     * 接收电商平台订单
     */
    public BrandOrderResponse receiveOrder(BrandOrderMessage message) {
        // 1. 创建品牌方订单
        BrandOrder order = BrandOrder.builder()
            .brandOrderNo(generateBrandOrderNo())
            .platformOrderNo(message.getPlatformOrderNo())
            .platform("TMALL_GLOBAL")  // 天猫国际
            .skuCode(message.getSkuCode())
            .quantity(message.getQuantity())
            .status("PENDING")
            .build();
        brandOrderRepository.save(order);

        // 2. 检查库存（日本东京仓库）
        boolean hasStock = warehouseService.checkStock(
            "JP-TOKYO-01",
            message.getSkuCode(),
            message.getQuantity()
        );

        if (!hasStock) {
            throw new BusinessException("库存不足");
        }

        // 3. 创建拣货任务
        warehouseService.createPickingTask(order);

        return BrandOrderResponse.builder()
            .brandOrderNo(order.getBrandOrderNo())
            .success(true)
            .build();
    }

    /**
     * 拣货打包完成后，安排发货
     */
    @Transactional
    public void shipOrder(String brandOrderNo) {
        BrandOrder order = brandOrderRepository.findByOrderNo(brandOrderNo);

        // 1. 选择国际物流（DHL优先，快速）
        LogisticsQuote quote = logisticsService.getQuote(
            "JP",  // 发货国
            "CN",  // 目的国
            order.getWeight()
        );

        // 2. 创建国际运单
        String trackingNo = logisticsService.createWaybill(order, quote);
        order.setTrackingNo(trackingNo);
        order.setCarrier("DHL");

        // 3. 推送物流单到中国海关（重要！）
        // 品牌方作为"运单主"，需要自己对接海关
        ChinaCustomsLogisticsMessage customsMessage = ChinaCustomsLogisticsMessage.builder()
            .logisticsNo(trackingNo)
            .orderNo(order.getPlatformOrderNo())  // 平台订单号
            .logisticsCompany("DHL")
            .receiverName(order.getConsignee())
            .receiverIdCard(order.getIdCard())
            .receiverPhone(order.getPhone())
            .receiverAddress(order.getAddress())
            .build();

        // 调用中国海关接口
        customsClient.submitLogistics(customsMessage);

        // 4. 通知电商平台：已发货
        platformCallbackService.notifyShipped(order);

        // 5. 更新订单状态
        order.setStatus("SHIPPED");
        brandOrderRepository.save(order);
    }
}

/**
 * 品牌方对接适配器
 * 不同品牌有不同的API格式，需要适配
 */
@Service
public class BrandApiAdapter {

    /**
     * 戴森品牌适配器
     */
    public static class DysonAdapter implements BrandStoreAdapter {

        @Override
        public BrandOrderResponse pushOrder(BrandOrderMessage message) {
            // 1. 转换为戴森API格式
            DysonOrderRequest request = DysonOrderRequest.builder()
                .orderId(message.getPlatformOrderNo())
                .productCode(message.getSkuCode())
                .qty(message.getQuantity())
                .customerName(message.getConsignee())
                .shippingAddress(message.getAddress())
                .build();

            // 2. 调用戴森API
            DysonOrderResponse response = dysonApiClient.createOrder(request);

            // 3. 转换为统一格式
            return BrandOrderResponse.builder()
                .brandOrderNo(response.getDysonOrderId())
                .success(response.isSuccess())
                .build();
        }
    }

    /**
     * 资生堂品牌适配器
     */
    public static class ShiseidoAdapter implements BrandStoreAdapter {

        @Override
        public BrandOrderResponse pushOrder(BrandOrderMessage message) {
            // 资生堂API格式不同，需要单独适配
            ShiseidoCreateOrderParam param = new ShiseidoCreateOrderParam();
            param.setExternalOrderNo(message.getPlatformOrderNo());
            param.setItemCode(message.getSkuCode());
            param.setQuantity(message.getQuantity());

            ShiseidoOrderResult result = shiseidoClient.submitOrder(param);

            return BrandOrderResponse.builder()
                .brandOrderNo(result.getOrderNumber())
                .success(result.getResultCode() == 0)
                .build();
        }
    }

    /**
     * 根据品牌选择适配器
     */
    public BrandStoreAdapter getAdapter(String brandCode) {
        switch (brandCode) {
            case "DYSON":
                return new DysonAdapter();
            case "SHISEIDO":
                return new ShiseidoAdapter();
            default:
                throw new BusinessException("不支持的品牌");
        }
    }
}

/**
 * 国际物流追踪聚合服务
 */
@Service
public class InternationalLogisticsTrackingService {

    /**
     * 统一查询接口
     */
    public LogisticsTrackingResponse track(String carrier, String trackingNo) {
        LogisticsProvider provider = getProvider(carrier);
        return provider.queryTracking(trackingNo);
    }

    /**
     * DHL物流追踪
     */
    public static class DHLProvider implements LogisticsProvider {

        @Override
        public LogisticsTrackingResponse queryTracking(String trackingNo) {
            // 调用DHL API
            DHLTrackingResponse response = dhlClient.track(trackingNo);

            // 转换为统一格式
            List<TrackingEvent> events = response.getEvents().stream()
                .map(e -> TrackingEvent.builder()
                    .time(e.getTimestamp())
                    .location(e.getLocation())
                    .status(mapDHLStatus(e.getStatusCode()))
                    .description(e.getDescription())
                    .build())
                .collect(Collectors.toList());

            return LogisticsTrackingResponse.builder()
                .trackingNo(trackingNo)
                .carrier("DHL")
                .currentStatus(response.getCurrentStatus())
                .events(events)
                .build();
        }

        /**
         * DHL状态码映射
         */
        private String mapDHLStatus(String dhlStatusCode) {
            Map<String, String> statusMapping = Map.of(
                "PU", "PICKED_UP",           // 已揽收
                "IT", "IN_TRANSIT",          // 运输中
                "AR", "ARRIVED_AT_CUSTOMS",  // 到达海关
                "CC", "CUSTOMS_CLEARED",     // 清关完成
                "OD", "OUT_FOR_DELIVERY",    // 派送中
                "OK", "DELIVERED"            // 已签收
            );
            return statusMapping.getOrDefault(dhlStatusCode, "UNKNOWN");
        }
    }

    /**
     * 定时同步物流状态
     */
    @Scheduled(cron = "0 */10 * * * ?")  // 每10分钟同步一次
    public void syncLogisticsStatus() {
        // 查询运输中的订单
        List<Order> shippingOrders = orderRepository.findByStatus("SHIPPED");

        for (Order order : shippingOrders) {
            try {
                // 查询最新物流状态
                LogisticsTrackingResponse tracking = track(
                    order.getLogisticsCompany(),
                    order.getLogisticsNo()
                );

                // 更新订单状态
                if ("CUSTOMS_CLEARED".equals(tracking.getCurrentStatus())) {
                    order.setCustomsStatus("CLEARED");
                    order.setClearedTime(LocalDateTime.now());
                }

                if ("DELIVERED".equals(tracking.getCurrentStatus())) {
                    order.setStatus("COMPLETED");
                    order.setCompletedTime(LocalDateTime.now());
                }

                orderRepository.save(order);

            } catch (Exception e) {
                log.error("物流同步失败：{}", order.getOrderNo(), e);
            }
        }
    }
}

/**
 * 保税仓模式核心流程
 */
@Service
public class BondedWarehouseOrderService {

    /**
     * 下单后立即清关
     */
    @Transactional
    public void processOrder(Order order) {
        // 1. 推送订单到海关
        customsService.submitOrder(order);

        // 2. 推送支付单到海关
        paymentService.submitPayment(order);

        // 3. 锁定保税仓库存
        warehouseService.lockInventory(order);

        // 4. 创建拣货任务
        pickingService.createTask(order);

        // 5. 等待海关放行（通常5分钟内）
        // 6. 放行后立即出库
        // 7. 24小时内送达用户
    }
}

/**
 * 跨境小包拼邮算法
 * 核心目标：将同一目的地、同一时间段的多个订单合并成一个包裹
 */
@Service
public class ConsolidationService {

    /**
     * 拼邮规则引擎
     */
    public List<ConsolidatedPackage> consolidate(List<Order> orders) {
        // 1. 按目的地分组
        Map<String, List<Order>> groupByCity = orders.stream()
            .collect(Collectors.groupingBy(Order::getCity));

        List<ConsolidatedPackage> packages = new ArrayList<>();

        for (Map.Entry<String, List<Order>> entry : groupByCity.entrySet()) {
            String city = entry.getKey();
            List<Order> cityOrders = entry.getValue();

            // 2. 按重量拼箱（每箱最多2kg）
            List<ConsolidatedPackage> cityPackages = packByWeight(cityOrders, 2000);

            packages.addAll(cityPackages);
        }

        return packages;
    }

    /**
     * 按重量拼箱
     */
    private List<ConsolidatedPackage> packByWeight(List<Order> orders, int maxWeight) {
        List<ConsolidatedPackage> packages = new ArrayList<>();
        ConsolidatedPackage currentPackage = new ConsolidatedPackage();
        int currentWeight = 0;

        for (Order order : orders) {
            int orderWeight = order.getWeight();

            // 超重，开新箱
            if (currentWeight + orderWeight > maxWeight) {
                packages.add(currentPackage);
                currentPackage = new ConsolidatedPackage();
                currentWeight = 0;
            }

            // 加入当前箱
            currentPackage.addOrder(order);
            currentWeight += orderWeight;
        }

        // 最后一箱
        if (!currentPackage.getOrders().isEmpty()) {
            packages.add(currentPackage);
        }

        return packages;
    }

    /**
     * 计算拼邮节省的运费
     */
    public BigDecimal calculateSaving(List<Order> orders) {
        // 1. 单独发货的总运费
        BigDecimal separateFreight = orders.stream()
            .map(order -> calculateFreight(order.getWeight()))
            .reduce(BigDecimal.ZERO, BigDecimal::add);

        // 2. 拼邮后的总运费
        List<ConsolidatedPackage> packages = consolidate(orders);
        BigDecimal consolidatedFreight = packages.stream()
            .map(pkg -> calculateFreight(pkg.getTotalWeight()))
            .reduce(BigDecimal.ZERO, BigDecimal::add);

        // 3. 节省金额
        return separateFreight.subtract(consolidatedFreight);
    }

    /**
     * 运费计算（首重0.5kg=30元，续重每0.1kg=3元）
     */
    private BigDecimal calculateFreight(int weightInGram) {
        if (weightInGram <= 500) {
            return new BigDecimal("30");
        }

        int extraWeight = weightInGram - 500;
        int extraUnits = (int) Math.ceil(extraWeight / 100.0);
        BigDecimal extraFreight = new BigDecimal(extraUnits * 3);

        return new BigDecimal("30").add(extraFreight);
    }
}

/**
 * 海外集货仓管理系统
 * 位于日本大阪的集货仓
 */
@Service
public class OverseasConsolidationWarehouseService {

    /**
     * 接收平台订单
     */
    public void receiveOrder(Order order) {
        // 1. 创建集货任务
        ConsolidationTask task = ConsolidationTask.builder()
            .orderId(order.getOrderNo())
            .skuCode(order.getSkuCode())
            .quantity(order.getQuantity())
            .destinationCity(order.getCity())
            .status("PENDING")
            .receivedTime(LocalDateTime.now())
            .build();
        taskRepository.save(task);

        // 2. 从货架拣货
        pickingService.pick(task);

        // 3. 暂存到集货区（等待拼箱）
        task.setStatus("WAITING_CONSOLIDATION");
        taskRepository.save(task);
    }

    /**
     * 定时拼箱任务（每天下午4点执行）
     */
    @Scheduled(cron = "0 0 16 * * ?")
    public void dailyConsolidation() {
        // 1. 查询今天的待拼箱订单
        LocalDate today = LocalDate.now();
        List<ConsolidationTask> tasks = taskRepository.findByStatusAndDate(
            "WAITING_CONSOLIDATION",
            today
        );

        // 2. 按目的地拼箱
        List<ConsolidatedPackage> packages = consolidationService.consolidate(
            tasks.stream().map(ConsolidationTask::getOrder).collect(Collectors.toList())
        );

        // 3. 打包
        for (ConsolidatedPackage pkg : packages) {
            // 3.1 装箱
            String packageNo = packingService.pack(pkg);

            // 3.2 称重
            int weight = weighingService.weigh(packageNo);

            // 3.3 生成面单
            String waybillNo = logisticsService.generateWaybill(packageNo, weight);

            // 3.4 更新包裹信息
            pkg.setPackageNo(packageNo);
            pkg.setWeight(weight);
            pkg.setWaybillNo(waybillNo);
            packageRepository.save(pkg);

            // 3.5 推送每个订单的物流单到海关
            for (Order order : pkg.getOrders()) {
                customsService.submitLogistics(order, waybillNo);
            }
        }

        // 4. 交给物流公司
        logisticsService.handover(packages);
    }

    /**
     * 特殊情况：单独发货
     * 用户支付了加急费用，不参与拼箱
     */
    public void shipSeparately(Order order) {
        // 1. 立即打包
        String packageNo = packingService.packSingle(order);

        // 2. 生成面单
        String waybillNo = logisticsService.generateWaybill(packageNo, order.getWeight());

        // 3. 推送物流单到海关
        customsService.submitLogistics(order, waybillNo);

        // 4. 立即发货（不等待拼箱）
        logisticsService.ship(waybillNo);

        // 5. 更新订单状态
        order.setStatus("SHIPPED_SEPARATELY");
        order.setShippedTime(LocalDateTime.now());
        orderRepository.save(order);
    }
}

/**
 * 跨境电商智能路由引擎
 * 根据商品、用户、库存等因素，自动选择最优发货模式
 */
@Service
public class SmartRoutingEngine {

    /**
     * 选择最优发货模式
     */
    public ShippingMode selectOptimalMode(Order order) {
        // 1. 优先检查保税仓库存
        boolean hasBondedStock = bondedWarehouseService.checkStock(
            order.getSkuCode(),
            order.getQuantity()
        );

        if (hasBondedStock) {
            // 保税仓有货，优先保税仓发货（时效最快）
            return ShippingMode.BONDED_WAREHOUSE;
        }

        // 2. 检查是否是品牌官方店铺
        Store store = storeService.getById(order.getStoreId());
        if (store.getType().equals("BRAND_OFFICIAL")) {
            // 品牌官方店，使用品牌直发
            return ShippingMode.BRAND_DIRECT;
        }

        // 3. 检查海外仓库存
        boolean hasOverseasStock = overseasWarehouseService.checkStock(
            order.getSkuCode(),
            order.getQuantity()
        );

        if (hasOverseasStock) {
            // 海外仓有货，使用直邮
            return ShippingMode.OVERSEAS_DIRECT;
        }

        // 4. 都没库存，抛异常
        throw new BusinessException("库存不足");
    }

    /**
     * 高级路由：考虑用户体验和成本
     */
    public ShippingMode selectAdvancedMode(Order order, User user) {
        // 1. VIP用户：优先保证时效
        if (user.getVipLevel() >= 5) {
            boolean hasBondedStock = bondedWarehouseService.checkStock(
                order.getSkuCode(),
                order.getQuantity()
            );
            if (hasBondedStock) {
                return ShippingMode.BONDED_WAREHOUSE;
            }
        }

        // 2. 高价值商品：优先品牌直发（正品保障）
        if (order.getTotalAmount().compareTo(new BigDecimal("1000")) > 0) {
            Store store = storeService.getById(order.getStoreId());
            if (store.getType().equals("BRAND_OFFICIAL")) {
                return ShippingMode.BRAND_DIRECT;
            }
        }

        // 3. 低价值商品：优先海外直邮（成本最低）
        if (order.getTotalAmount().compareTo(new BigDecimal("300")) < 0) {
            boolean hasOverseasStock = overseasWarehouseService.checkStock(
                order.getSkuCode(),
                order.getQuantity()
            );
            if (hasOverseasStock) {
                return ShippingMode.OVERSEAS_DIRECT;
            }
        }

        // 4. 默认策略：保税仓 > 海外直邮 > 品牌直发
        return selectOptimalMode(order);
    }

    /**
     * 预测最优补货策略
     */
    public ReplenishmentPlan predictReplenishment(String skuCode) {
        // 1. 分析销售数据
        SalesAnalysis analysis = salesAnalysisService.analyze(skuCode, 30);

        // 2. 预测未来30天销量
        int predictedSales = analysis.getPredictedSales();

        // 3. 计算最优库存分布
        // 热销商品（日销>100）：保税仓备货80%，海外仓20%
        // 中销商品（日销10-100）：保税仓50%，海外仓50%
        // 慢销商品（日销<10）：海外仓100%，不备保税仓

        int dailySales = predictedSales / 30;

        if (dailySales > 100) {
            // 热销商品
            return ReplenishmentPlan.builder()
                .bondedWarehouseQty((int) (predictedSales * 0.8))
                .overseasWarehouseQty((int) (predictedSales * 0.2))
                .mode("HOT_SELLING")
                .build();
        } else if (dailySales > 10) {
            // 中销商品
            return ReplenishmentPlan.builder()
                .bondedWarehouseQty((int) (predictedSales * 0.5))
                .overseasWarehouseQty((int) (predictedSales * 0.5))
                .mode("NORMAL_SELLING")
                .build();
        } else {
            // 慢销商品
            return ReplenishmentPlan.builder()
                .bondedWarehouseQty(0)
                .overseasWarehouseQty(predictedSales)
                .mode("SLOW_SELLING")
                .build();
        }
    }
}

/**
 * 动态库存调拨系统
 * 根据销售情况，自动在保税仓和海外仓之间调拨库存
 */
@Service
public class DynamicInventoryTransferService {

    /**
     * 定时任务：每天分析销售数据，自动调拨库存
     */
    @Scheduled(cron = "0 0 2 * * ?")  // 每天凌晨2点执行
    public void dailyTransfer() {
        // 1. 查询所有SKU的库存情况
        List<InventorySummary> summaries = inventoryService.getSummaryAll();

        for (InventorySummary summary : summaries) {
            // 2. 分析销售趋势
            SalesTrend trend = salesAnalysisService.analyzeTrend(
                summary.getSkuCode(),
                7  // 最近7天
            );

            // 3. 判断是否需要调拨
            if (shouldTransfer(summary, trend)) {
                TransferPlan plan = calculateTransferPlan(summary, trend);
                executeTransfer(plan);
            }
        }
    }

    /**
     * 判断是否需要调拨
     */
    private boolean shouldTransfer(InventorySummary summary, SalesTrend trend) {
        // 场景1：保税仓库存不足，但海外仓有货
        if (summary.getBondedWarehouseQty() < trend.getDailySales() * 3
            && summary.getOverseasWarehouseQty() > trend.getDailySales() * 10) {
            return true;
        }

        // 场景2：保税仓库存积压，且销售趋势下降
        if (summary.getBondedWarehouseQty() > trend.getDailySales() * 30
            && trend.isDecreasing()) {
            return true;
        }

        return false;
    }

    /**
     * 计算调拨计划
     */
    private TransferPlan calculateTransferPlan(InventorySummary summary, SalesTrend trend) {
        // 保税仓库存不足：从海外仓调拨到保税仓
        if (summary.getBondedWarehouseQty() < trend.getDailySales() * 3) {
            int transferQty = trend.getDailySales() * 10;  // 调拨10天销量

            return TransferPlan.builder()
                .skuCode(summary.getSkuCode())
                .fromWarehouse("OVERSEAS")
                .toWarehouse("BONDED")
                .quantity(transferQty)
                .reason("保税仓库存不足")
                .build();
        }

        // 保税仓库存积压：从保税仓调回海外仓（避免占用保税仓空间）
        if (summary.getBondedWarehouseQty() > trend.getDailySales() * 30) {
            int transferQty = summary.getBondedWarehouseQty() - trend.getDailySales() * 15;

            return TransferPlan.builder()
                .skuCode(summary.getSkuCode())
                .fromWarehouse("BONDED")
                .toWarehouse("OVERSEAS")
                .quantity(transferQty)
                .reason("保税仓库存积压")
                .build();
        }

        return null;
    }

    /**
     * 执行调拨
     */
    private void executeTransfer(TransferPlan plan) {
        // 1. 创建调拨单
        TransferOrder transferOrder = TransferOrder.builder()
            .transferNo(generateTransferNo())
            .skuCode(plan.getSkuCode())
            .fromWarehouse(plan.getFromWarehouse())
            .toWarehouse(plan.getToWarehouse())
            .quantity(plan.getQuantity())
            .status("PENDING")
            .build();
        transferOrderRepository.save(transferOrder);

        // 2. 从源仓库出库
        warehouseService.outbound(plan.getFromWarehouse(), plan.getSkuCode(), plan.getQuantity());

        // 3. 国际运输（海外仓→保税仓）
        if (plan.getFromWarehouse().equals("OVERSEAS")) {
            // 安排国际运输
            logisticsService.arrangeInternationalShipping(transferOrder);
        }

        // 4. 入目标仓库
        // 注意：海外仓→保税仓需要报关
        if (plan.getToWarehouse().equals("BONDED")) {
            customsService.declareImport(transferOrder);
        }

        warehouseService.inbound(plan.getToWarehouse(), plan.getSkuCode(), plan.getQuantity());

        // 5. 更新调拨单状态
        transferOrder.setStatus("COMPLETED");
        transferOrderRepository.save(transferOrder);
    }
}

/**
 * 跨境即时零售
 * 在一线城市核心商圈建立前置仓，存放热销跨境商品
 */
@Service
public class CrossBorderInstantRetailService {

    /**
     * 前置仓选址算法
     * 目标：覆盖80%的核心用户
     */
    public List<FrontWarehouse> selectLocations(String city) {
        // 1. 分析用户热力图
        HeatMap heatMap = userAnalysisService.getHeatMap(city);

        // 2. K-means聚类，找出用户密集区域
        List<Cluster> clusters = kMeansService.cluster(heatMap.getPoints(), 5);

        // 3. 在每个聚类中心建立前置仓
        List<FrontWarehouse> warehouses = clusters.stream()
            .map(cluster -> FrontWarehouse.builder()
                .city(city)
                .location(cluster.getCenter())
                .coverage(cluster.getRadius())
                .build())
            .collect(Collectors.toList());

        return warehouses;
    }

    /**
     * 预测性备货
     * 根据用户行为，预测未来1小时的订单，提前备货到前置仓
     */
    public void predictiveStocking() {
        // 1. 分析用户浏览行为
        List<BrowsingEvent> events = userBehaviorService.getRecentBrowsing(60);

        // 2. 预测转化率
        Map<String, Double> conversionRate = mlService.predictConversion(events);

        // 3. 计算需要备货的SKU和数量
        for (Map.Entry<String, Double> entry : conversionRate.entrySet()) {
            String skuCode = entry.getKey();
            Double rate = entry.getValue();

            if (rate > 0.3) {  // 转化率>30%，备货
                int qty = (int) (events.size() * rate);
                frontWarehouseService.stock(skuCode, qty);
            }
        }
    }
}

/**
 * 虚拟保税仓
 * 商品在海外,但海关数据提前申报,实现快速清关
 */
@Service
public class VirtualBondedWarehouseService {

    /**
     * 预申报
     * 商品还在海外时,就提前向海关申报数据
     */
    public void preDeclaration(Product product) {
        // 1. 商品信息预申报
        CustomsPreDeclarationMessage message = CustomsPreDeclarationMessage.builder()
            .skuCode(product.getSkuCode())
            .productName(product.getName())
            .hsCode(product.getHsCode())
            .brand(product.getBrand())
            .originCountry(product.getOriginCountry())
            .estimatedArrivalTime(product.getEstimatedArrivalTime())
            .build();

        // 2. 推送到海关
        customsClient.preDeclaration(message);

        // 3. 海关提前审核
        // 商品到达时,直接放行,无需再次审核
    }

    /**
     * 智能清关
     * 用户下单时,海关已经完成审核,直接放行
     */
    public void smartClearance(Order order) {
        // 1. 检查商品是否已预申报
        boolean preDeclared = customsClient.checkPreDeclaration(order.getSkuCode());

        if (preDeclared) {
            // 2. 直接放行,无需等待三单对碰
            order.setCustomsStatus("PASSED");
            order.setClearanceTime(0);  // 清关时间0秒
        } else {
            // 3. 走正常三单对碰流程
            customsService.normalClearance(order);
        }
    }
}

/**
 * AI智能选品系统
 */
@Service
public class AIProductSelectionService {

    /**
     * 多维度评分模型
     */
    public ProductScore scoreProduct(Product product) {
        // 1. 市场需求度（Google Trends、百度指数）
        double marketDemand = marketAnalysisService.getDemandScore(product);

        // 2. 竞争激烈度（在售商品数量、价格区间）
        double competition = competitionAnalysisService.getCompetitionScore(product);

        // 3. 利润空间（采购价、运费、关税、平台佣金）
        double profitMargin = calculateProfitMargin(product);

        // 4. 物流适配度（重量、体积、易碎性）
        double logisticsFit = logisticsService.getFitnessScore(product);

        // 5. 合规风险（是否需要特殊资质、是否敏感商品）
        double complianceRisk = complianceService.getRiskScore(product);

        // 6. 综合评分
        double totalScore = marketDemand * 0.3
                          + (1 - competition) * 0.2
                          + profitMargin * 0.3
                          + logisticsFit * 0.1
                          + (1 - complianceRisk) * 0.1;

        return ProductScore.builder()
            .skuCode(product.getSkuCode())
            .totalScore(totalScore)
            .marketDemand(marketDemand)
            .competition(competition)
            .profitMargin(profitMargin)
            .recommendation(totalScore > 0.7 ? "强烈推荐" : "不推荐")
            .build();
    }
}