feat: 租户账单公告通知接口

src/Application/TakeoutSaaS.Application/App/Tenants/Handlers/MarkTenantBillingPaidCommandHandler.cs

@@ -0,0 +1,32 @@
+using MediatR;
+using TakeoutSaaS.Application.App.Tenants.Commands;
+using TakeoutSaaS.Application.App.Tenants.Dto;
+using TakeoutSaaS.Domain.Tenants.Enums;
+using TakeoutSaaS.Domain.Tenants.Repositories;
+
+namespace TakeoutSaaS.Application.App.Tenants.Handlers;
+
+/// <summary>
+/// 标记账单支付处理器。
+/// </summary>
+public sealed class MarkTenantBillingPaidCommandHandler(ITenantBillingRepository billingRepository)
+    : IRequestHandler<MarkTenantBillingPaidCommand, TenantBillingDto?>
+{
+    public async Task<TenantBillingDto?> Handle(MarkTenantBillingPaidCommand request, CancellationToken cancellationToken)
+    {
+        var bill = await billingRepository.FindByIdAsync(request.TenantId, request.BillingId, cancellationToken);
+        if (bill == null)
+        {
+            return null;
+        }
+
+        bill.AmountPaid = request.AmountPaid;
+        bill.Status = TenantBillingStatus.Paid;
+        bill.DueDate = bill.DueDate;
+
+        await billingRepository.UpdateAsync(bill, cancellationToken);
+        await billingRepository.SaveChangesAsync(cancellationToken);
+
+        return bill.ToDto();
+    }
+}