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/CreateStoreTableAreaCommandHandler.cs

@@ -0,0 +1,58 @@
+using MediatR;
+using Microsoft.Extensions.Logging;
+using TakeoutSaaS.Application.App.Stores.Commands;
+using TakeoutSaaS.Application.App.Stores.Dto;
+using TakeoutSaaS.Domain.Stores.Entities;
+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>
+/// 创建桌台区域处理器。
+/// </summary>
+public sealed class CreateStoreTableAreaCommandHandler(
+    IStoreRepository storeRepository,
+    ITenantProvider tenantProvider,
+    ILogger<CreateStoreTableAreaCommandHandler> logger)
+    : IRequestHandler<CreateStoreTableAreaCommand, StoreTableAreaDto>
+{
+    /// <inheritdoc />
+    public async Task<StoreTableAreaDto> Handle(CreateStoreTableAreaCommand request, CancellationToken cancellationToken)
+    {
+        // 1. 校验门店存在
+        var tenantId = tenantProvider.GetCurrentTenantId();
+        var store = await storeRepository.FindByIdAsync(request.StoreId, tenantId, cancellationToken);
+        if (store is null)
+        {
+            throw new BusinessException(ErrorCodes.NotFound, "门店不存在");
+        }
+
+        // 2. 校验区域名称唯一
+        var existingAreas = await storeRepository.GetTableAreasAsync(request.StoreId, tenantId, cancellationToken);
+        var hasDuplicate = existingAreas.Any(x => x.Name.Equals(request.Name, StringComparison.OrdinalIgnoreCase));
+        if (hasDuplicate)
+        {
+            throw new BusinessException(ErrorCodes.Conflict, "区域名称已存在");
+        }
+
+        // 3. 构建实体
+        var area = new StoreTableArea
+        {
+            StoreId = request.StoreId,
+            Name = request.Name.Trim(),
+            Description = request.Description?.Trim(),
+            SortOrder = request.SortOrder
+        };
+
+        // 4. 持久化
+        await storeRepository.AddTableAreasAsync(new[] { area }, cancellationToken);
+        await storeRepository.SaveChangesAsync(cancellationToken);
+        logger.LogInformation("创建桌台区域 {AreaId} 对应门店 {StoreId}", area.Id, request.StoreId);
+
+        // 5. 返回 DTO
+        return StoreMapping.ToDto(area);
+    }
+}