feat: 租户账单公告通知接口

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

@@ -0,0 +1,42 @@
+using MediatR;
+using TakeoutSaaS.Application.App.Tenants.Commands;
+using TakeoutSaaS.Application.App.Tenants.Dto;
+using TakeoutSaaS.Domain.Tenants.Entities;
+using TakeoutSaaS.Domain.Tenants.Repositories;
+using TakeoutSaaS.Shared.Abstractions.Constants;
+using TakeoutSaaS.Shared.Abstractions.Exceptions;
+
+namespace TakeoutSaaS.Application.App.Tenants.Handlers;
+
+/// <summary>
+/// 创建租户账单处理器。
+/// </summary>
+public sealed class CreateTenantBillingCommandHandler(ITenantBillingRepository billingRepository)
+    : IRequestHandler<CreateTenantBillingCommand, TenantBillingDto>
+{
+    public async Task<TenantBillingDto> Handle(CreateTenantBillingCommand request, CancellationToken cancellationToken)
+    {
+        if (string.IsNullOrWhiteSpace(request.StatementNo))
+        {
+            throw new BusinessException(ErrorCodes.BadRequest, "账单编号不能为空");
+        }
+
+        var bill = new TenantBillingStatement
+        {
+            TenantId = request.TenantId,
+            StatementNo = request.StatementNo.Trim(),
+            PeriodStart = request.PeriodStart,
+            PeriodEnd = request.PeriodEnd,
+            AmountDue = request.AmountDue,
+            AmountPaid = request.AmountPaid,
+            Status = request.Status,
+            DueDate = request.DueDate,
+            LineItemsJson = request.LineItemsJson
+        };
+
+        await billingRepository.AddAsync(bill, cancellationToken);
+        await billingRepository.SaveChangesAsync(cancellationToken);
+
+        return bill.ToDto();
+    }
+}