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yanpeng200212
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using System.Text.Json;
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using F9WebAiTest.Application.Common;
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using F9WebAiTest.Application.Dtos;
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using F9WebAiTest.Application.Dtos.Notice;
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using F9WebAiTest.Domain.Common;
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using F9WebAiTest.Domain.Entities;
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using F9WebAiTest.Domain.Entities.Notice;
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using MediatR;
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namespace F9WebAiTest.Application.Services.Notice;
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/// <summary>
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/// 业务系统触发消息创建的命令（通用化）。
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/// 用法：await _mediator.Send(new CreateNotificationCommand { NotificationTypeCode = "LeaveApproval", ... });
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/// </summary>
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public class CreateNotificationCommand : IRequest<long>
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{
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public string NotificationTypeCode { get; set; } = ""; // 消息类型编码，如 "LeaveApproval"
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public string BusinessType { get; set; } = ""; // 业务类型标识
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public string BusinessId { get; set; } = ""; // 业务单据ID
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public string Title { get; set; } = ""; // 标题
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public string Content { get; set; } = ""; // 内容
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public NotificationPriority Priority { get; set; } = NotificationPriority.Normal;
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public string BizContext { get; set; } = ""; // 业务上下文（JSON）
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public List<long> ForceReceivers { get; set; } = new(); // 强制接收人（绕过订阅）
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public string RoutePath { get; set; } = ""; // 跳转路由（可选，覆盖类型模板）
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public List<long> AssigneeIds { get; set; } = new(); // 待办处理人（Category=Todo 时生效）
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public DateTime? DueTime { get; set; } // 待办截止时间
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public long CreatorId { get; set; } // 创建人ID
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public string CreatorName { get; set; } = ""; // 创建人姓名
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}
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/// <summary>
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/// 业务侧发送消息的简洁命令（基于消息类型枚举）。
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/// 用法（参照 CQRS 惯例）：
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/// var ok = await mediator.Send(new SendNotificationCommand(
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/// NotificationTypeEnum.LeaveApproval,
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/// BusinessId: leaveId.ToString(),
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/// ForceReceivers: approverIds,
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/// AssigneeIds: approverIds));
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/// if (!ok) throw new F9OperationException("请假审批消息发送失败");
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/// </summary>
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public record SendNotificationCommand(
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NotificationTypeEnum Type,
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string BusinessId = "",
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string Title = "",
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string Content = "",
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string BizContext = "",
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NotificationPriority Priority = NotificationPriority.Normal,
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List<long> ForceReceivers = null,
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List<long> AssigneeIds = null,
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DateTime? DueTime = null
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) : IRequest<bool>;
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public class SendNotificationCommandHandler : IRequestHandler<SendNotificationCommand, bool>
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{
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private readonly IMediator _mediator;
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public SendNotificationCommandHandler(IMediator mediator) => _mediator = mediator;
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public async Task<bool> Handle(SendNotificationCommand command, CancellationToken cancellationToken)
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{
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// 枚举名即消息类型 Code，复用底层创建命令
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var msgId = await _mediator.Send(new CreateNotificationCommand
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{
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NotificationTypeCode = command.Type.ToString(),
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BusinessType = command.Type.ToString(),
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BusinessId = command.BusinessId ?? "",
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Title = command.Title ?? "",
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Content = command.Content ?? "",
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BizContext = command.BizContext ?? "",
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Priority = command.Priority,
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ForceReceivers = command.ForceReceivers ?? new List<long>(),
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AssigneeIds = command.AssigneeIds ?? new List<long>(),
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DueTime = command.DueTime
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}, cancellationToken);
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return msgId > 0;
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}
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}
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/// <summary>
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/// 创建消息（业务触发的统一入口）。
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/// 创建后**立即**确定接收人、写入接收人表并实时推送（已移除后台投递服务，无轮询、无延迟）。
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/// 接收人规则：ForceReceivers 非空 → 精确送达；否则 → 按该消息类型的订阅关系广播。
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/// 可靠性：接收人幂等（MessageId + UserId 唯一）；用户离线时推送无接收者但消息已落库，上线后拉取兜底。
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/// </summary>
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public class CreateNotificationCommandHandler : IRequestHandler<CreateNotificationCommand, long>
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{
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private readonly IRepository<NotificationType> _typeRepo;
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private readonly IRepository<NotificationMessage> _msgRepo;
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private readonly IRepository<TodoItem> _todoRepo;
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private readonly IRepository<UserNotificationSubscription> _subRepo;
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private readonly IRepository<NotificationReceiver> _receiverRepo;
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private readonly INotificationPusher _pusher;
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public CreateNotificationCommandHandler(
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IRepository<NotificationType> typeRepo,
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IRepository<NotificationMessage> msgRepo,
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IRepository<TodoItem> todoRepo,
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IRepository<UserNotificationSubscription> subRepo,
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IRepository<NotificationReceiver> receiverRepo,
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INotificationPusher pusher)
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{
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_typeRepo = typeRepo;
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_msgRepo = msgRepo;
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_todoRepo = todoRepo;
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_subRepo = subRepo;
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_receiverRepo = receiverRepo;
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_pusher = pusher;
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}
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public async Task<long> Handle(CreateNotificationCommand cmd, CancellationToken cancellationToken)
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{
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var type = await _typeRepo.FirstOrDefaultAsync(t => t.Code == cmd.NotificationTypeCode);
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if (type == null) throw new ServiceException($"消息类型「{cmd.NotificationTypeCode}」不存在，请先由管理员创建");
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if (!type.IsActive) throw new ServiceException($"消息类型「{type.Name}」已关闭订阅");
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// 生成跳转路由：命令直接指定 > 类型模板替换业务ID
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var routePath = !string.IsNullOrWhiteSpace(cmd.RoutePath)
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? cmd.RoutePath
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: (!string.IsNullOrWhiteSpace(type.RouteTemplate)
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? type.RouteTemplate.Replace("{businessId}", cmd.BusinessId ?? "")
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: "");
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var msg = new NotificationMessage
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{
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NotificationTypeId = type.Id,
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MessageTypeCode = type.Code,
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BusinessType = cmd.BusinessType,
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BusinessId = cmd.BusinessId,
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Title = cmd.Title,
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Content = cmd.Content,
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Priority = cmd.Priority,
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Status = NotificationStatus.Sent, // 即时送达：无后台队列，创建即投递
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BizContext = cmd.BizContext ?? "",
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ForceReceivers = cmd.ForceReceivers == null || cmd.ForceReceivers.Count == 0
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? ""
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: JsonSerializer.Serialize(cmd.ForceReceivers),
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CreatorId = cmd.CreatorId,
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CreatorName = cmd.CreatorName,
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Category = type.Category,
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RoutePath = routePath
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};
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await _msgRepo.AddAsync(msg);
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await _msgRepo.SaveChangesAsync();
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// 待办消息：为每个处理人生成待办事项
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if (type.Category == NotificationCategory.Todo && cmd.AssigneeIds != null && cmd.AssigneeIds.Count > 0)
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{
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foreach (var assigneeId in cmd.AssigneeIds.Distinct())
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{
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await _todoRepo.AddAsync(new TodoItem
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{
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MessageId = msg.Id,
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AssigneeId = assigneeId,
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TodoStatus = TodoItemStatus.Pending,
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DueTime = cmd.DueTime
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});
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}
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await _todoRepo.SaveChangesAsync();
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}
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// 即时投递 + 实时推送
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await DeliverAsync(msg, type, cancellationToken);
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return msg.Id;
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}
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/// <summary>确定接收人 → 写接收人表 → 实时推送（推送失败不影响业务，消息已落库可拉取）</summary>
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private async Task DeliverAsync(NotificationMessage msg, NotificationType type, CancellationToken ct)
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{
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// 1. 确定接收人（精确送达 与 订阅广播 二选一）
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var receiverIds = new HashSet<long>();
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var hasForceReceivers = false;
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if (!string.IsNullOrWhiteSpace(msg.ForceReceivers))
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{
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try
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{
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var force = JsonSerializer.Deserialize<List<long>>(msg.ForceReceivers);
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if (force != null && force.Count > 0)
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{
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hasForceReceivers = true;
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foreach (var id in force) receiverIds.Add(id);
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}
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}
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catch { /* 忽略非法 JSON */ }
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}
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if (!hasForceReceivers && type.IsActive)
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{
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var subs = await _subRepo.FindAsync(s => s.NotificationTypeId == msg.NotificationTypeId && s.IsActive);
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foreach (var s in subs) receiverIds.Add(s.UserId);
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}
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if (receiverIds.Count == 0) return;
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// 2. 写接收人（幂等：MessageId + UserId 唯一）
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var added = new List<NotificationReceiver>();
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foreach (var userId in receiverIds)
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{
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var exist = await _receiverRepo.FirstOrDefaultAsync(r => r.MessageId == msg.Id && r.UserId == userId);
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if (exist != null) continue;
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var receiver = new NotificationReceiver
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{
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MessageId = msg.Id,
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UserId = userId,
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ReadStatus = NotificationReadStatus.Unread,
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SendStatus = NotificationSendStatus.NotSent
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};
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await _receiverRepo.AddAsync(receiver);
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added.Add(receiver);
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}
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if (added.Count == 0) return;
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await _receiverRepo.SaveChangesAsync();
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// 3. 实时推送新消息 + 未读统计
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// 在线（Hub 有活动连接）→ 推送并标记成功；
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// 离线 → 不推送、标记 IsOffline，消息已落库，用户上线后从"我的消息"拉取兜底。
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var dto = BuildDto(msg, type.Name);
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foreach (var receiver in added)
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{
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try
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{
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var delivered = await _pusher.PushNewMessageAsync(receiver.UserId, dto, ct);
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if (delivered)
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{
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receiver.SendStatus = NotificationSendStatus.Success;
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receiver.SendTime = DateTime.Now;
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receiver.IsOffline = false;
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var unread = await _receiverRepo.CountAsync(r =>
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r.UserId == receiver.UserId && r.ReadStatus == NotificationReadStatus.Unread);
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await _pusher.PushUnreadCountAsync(receiver.UserId, (int)unread, 0, ct);
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}
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else
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{
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// 用户离线：不推送，等待上线拉取
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receiver.SendStatus = NotificationSendStatus.NotSent;
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receiver.IsOffline = true;
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}
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}
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catch (Exception ex)
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{
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// 推送异常（连接刚好断开等）：标记失败与离线，消息已持久化，上线后拉取兜底
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receiver.SendStatus = NotificationSendStatus.Failed;
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receiver.IsOffline = true;
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receiver.ErrorMsg = ex.Message;
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}
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await _receiverRepo.UpdateAsync(receiver);
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}
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await _receiverRepo.SaveChangesAsync();
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}
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private static NotificationMessageDto BuildDto(NotificationMessage msg, string typeName) => new()
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{
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Id = msg.Id,
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NotificationTypeId = msg.NotificationTypeId,
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MessageTypeCode = msg.MessageTypeCode,
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TypeName = typeName,
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Title = msg.Title,
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Content = msg.Content,
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Priority = (int)msg.Priority,
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BusinessType = msg.BusinessType,
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BusinessId = msg.BusinessId,
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Category = (int)msg.Category,
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RoutePath = msg.RoutePath,
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CreatedTime = msg.CreatedAt,
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ReadStatus = 0
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};
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}
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