118 lines
4.7 KiB
C#
118 lines
4.7 KiB
C#
using MediatR;
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using Microsoft.Extensions.Logging;
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using System.Text.Json;
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using TakeoutSaaS.Application.App.Subscriptions.Commands;
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using TakeoutSaaS.Domain.Tenants.Entities;
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using TakeoutSaaS.Domain.Tenants.Enums;
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using TakeoutSaaS.Domain.Tenants.Repositories;
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using TakeoutSaaS.Shared.Abstractions.Ids;
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namespace TakeoutSaaS.Application.App.Subscriptions.Handlers;
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/// <summary>
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/// 续费提醒处理器：在到期前 7/3/1 天等时间点发送站内提醒（幂等）。
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/// </summary>
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public sealed class ProcessRenewalRemindersCommandHandler(
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ISubscriptionRepository subscriptionRepository,
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ITenantNotificationRepository notificationRepository,
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IIdGenerator idGenerator,
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ILogger<ProcessRenewalRemindersCommandHandler> logger)
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: IRequestHandler<ProcessRenewalRemindersCommand, ProcessRenewalRemindersResult>
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{
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private const string ReminderTitle = "订阅续费提醒";
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/// <inheritdoc />
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public async Task<ProcessRenewalRemindersResult> Handle(ProcessRenewalRemindersCommand request, CancellationToken cancellationToken)
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{
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// 1. 读取提醒配置
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var now = DateTime.UtcNow;
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var candidateCount = 0;
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var createdReminderCount = 0;
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var dedupeWindowStart = now.AddHours(-24);
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// 2. 按提醒时间点扫描到期订阅
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foreach (var daysBeforeExpiry in request.ReminderDaysBeforeExpiry.Distinct().OrderByDescending(x => x))
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{
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// 2.1 计算目标日期区间（按天匹配）
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var targetDate = now.AddDays(daysBeforeExpiry);
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var startOfDay = targetDate.Date;
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var endOfDay = startOfDay.AddDays(1);
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// 2.2 查询候选订阅（活跃 + 未开自动续费 + 到期在当日）
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var candidates = await subscriptionRepository.FindRenewalReminderCandidatesAsync(
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startOfDay,
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endOfDay,
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cancellationToken);
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candidateCount += candidates.Count;
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foreach (var item in candidates)
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{
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// 2.3 幂等：同一订阅 + 同一天数提醒，在 24 小时内只发送一次
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var metadataJson = BuildReminderMetadata(item.Subscription.Id, daysBeforeExpiry, item.Subscription.EffectiveTo);
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var alreadySent = await notificationRepository.ExistsByMetadataAsync(
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item.Subscription.TenantId,
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ReminderTitle,
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metadataJson,
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dedupeWindowStart,
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cancellationToken);
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if (alreadySent)
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{
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continue;
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}
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// 2.4 构造提醒内容并入库
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var notification = new TenantNotification
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{
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Id = idGenerator.NextId(),
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TenantId = item.Subscription.TenantId,
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Title = ReminderTitle,
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Message = $"您的订阅套餐「{item.Package.Name}」将在 {daysBeforeExpiry} 天内到期（到期时间：{item.Subscription.EffectiveTo:yyyy-MM-dd HH:mm}），请及时续费以免影响使用。",
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Severity = daysBeforeExpiry <= 1
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? TenantNotificationSeverity.Critical
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: TenantNotificationSeverity.Warning,
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Channel = TenantNotificationChannel.InApp,
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SentAt = now,
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ReadAt = null,
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MetadataJson = metadataJson,
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CreatedAt = now
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};
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await notificationRepository.AddAsync(notification, cancellationToken);
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createdReminderCount++;
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logger.LogInformation(
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"续费提醒：TenantId={TenantId}, TenantName={TenantName}, SubscriptionId={SubscriptionId}, DaysBeforeExpiry={DaysBeforeExpiry}",
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item.Tenant.Id,
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item.Tenant.Name,
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item.Subscription.Id,
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daysBeforeExpiry);
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}
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}
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// 3. 保存变更
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if (createdReminderCount > 0)
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{
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await notificationRepository.SaveChangesAsync(cancellationToken);
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}
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return new ProcessRenewalRemindersResult
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{
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CandidateCount = candidateCount,
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CreatedReminderCount = createdReminderCount
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};
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}
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private static string BuildReminderMetadata(long subscriptionId, int daysBeforeExpiry, DateTime effectiveTo)
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{
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// 1. 使用稳定字段顺序的 JSON 作为幂等键
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return JsonSerializer.Serialize(new
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{
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Type = "RenewalReminder",
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SubscriptionId = subscriptionId,
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DaysBeforeExpiry = daysBeforeExpiry,
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EffectiveTo = effectiveTo.ToString("O")
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});
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}
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}
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