feat: 桌码管理支持区域、批量生成与二维码导出

src/Application/TakeoutSaaS.Application/App/Stores/Handlers/DeleteStoreTableAreaCommandHandler.cs

@@ -0,0 +1,52 @@
+using MediatR;
+using Microsoft.Extensions.Logging;
+using TakeoutSaaS.Application.App.Stores.Commands;
+using TakeoutSaaS.Domain.Stores.Repositories;
+using TakeoutSaaS.Shared.Abstractions.Constants;
+using TakeoutSaaS.Shared.Abstractions.Exceptions;
+using TakeoutSaaS.Shared.Abstractions.Tenancy;
+
+namespace TakeoutSaaS.Application.App.Stores.Handlers;
+
+/// <summary>
+/// 删除桌台区域处理器。
+/// </summary>
+public sealed class DeleteStoreTableAreaCommandHandler(
+    IStoreRepository storeRepository,
+    ITenantProvider tenantProvider,
+    ILogger<DeleteStoreTableAreaCommandHandler> logger)
+    : IRequestHandler<DeleteStoreTableAreaCommand, bool>
+{
+    /// <inheritdoc />
+    public async Task<bool> Handle(DeleteStoreTableAreaCommand request, CancellationToken cancellationToken)
+    {
+        // 1. 读取区域
+        var tenantId = tenantProvider.GetCurrentTenantId();
+        var area = await storeRepository.FindTableAreaByIdAsync(request.AreaId, tenantId, cancellationToken);
+        if (area is null)
+        {
+            return false;
+        }
+
+        // 2. 校验门店归属
+        if (area.StoreId != request.StoreId)
+        {
+            return false;
+        }
+
+        // 3. 校验区域下无桌码
+        var tables = await storeRepository.GetTablesAsync(request.StoreId, tenantId, cancellationToken);
+        var hasTable = tables.Any(x => x.AreaId == request.AreaId);
+        if (hasTable)
+        {
+            throw new BusinessException(ErrorCodes.Conflict, "区域下仍有桌码，无法删除");
+        }
+
+        // 4. 删除
+        await storeRepository.DeleteTableAreaAsync(request.AreaId, tenantId, cancellationToken);
+        await storeRepository.SaveChangesAsync(cancellationToken);
+        logger.LogInformation("删除桌台区域 {AreaId} 对应门店 {StoreId}", request.AreaId, request.StoreId);
+
+        return true;
+    }
+}