feat: 租户账单公告通知接口

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

@@ -0,0 +1,27 @@
+using System.Linq;
+using MediatR;
+using TakeoutSaaS.Application.App.Tenants.Dto;
+using TakeoutSaaS.Application.App.Tenants.Queries;
+using TakeoutSaaS.Domain.Tenants.Repositories;
+using TakeoutSaaS.Shared.Abstractions.Results;
+
+namespace TakeoutSaaS.Application.App.Tenants.Handlers;
+
+/// <summary>
+/// 账单分页查询处理器。
+/// </summary>
+public sealed class SearchTenantBillsQueryHandler(ITenantBillingRepository billingRepository)
+    : IRequestHandler<SearchTenantBillsQuery, PagedResult<TenantBillingDto>>
+{
+    public async Task<PagedResult<TenantBillingDto>> Handle(SearchTenantBillsQuery request, CancellationToken cancellationToken)
+    {
+        var bills = await billingRepository.SearchAsync(request.TenantId, request.Status, request.From, request.To, cancellationToken);
+
+        var ordered = bills.OrderByDescending(x => x.PeriodEnd).ToList();
+        var page = request.Page <= 0 ? 1 : request.Page;
+        var size = request.PageSize <= 0 ? 20 : request.PageSize;
+        var items = ordered.Skip((page - 1) * size).Take(size).Select(x => x.ToDto()).ToList();
+
+        return new PagedResult<TenantBillingDto>(items, page, size, ordered.Count);
+    }
+}