using Admin.NET.Core.Service;
using Microsoft.AspNetCore.SignalR;

namespace Admin.NET.Plugin.ApprovalFlow.Service;

/// <summary>
/// SignalR 站内实时推送（P4-16 - 已有实现重构为独立 Pusher）
/// </summary>
public class SignalRNotifyPusher : INotifyPusher, ITransient
{
    public string Channel => "SignalR";

    private readonly IHubContext<OnlineUserHub, IOnlineUserHub> _hubContext;
    private readonly SysCacheService _cacheService;

    public SignalRNotifyPusher(
        IHubContext<OnlineUserHub, IOnlineUserHub> hubContext,
        SysCacheService cacheService)
    {
        _hubContext = hubContext;
        _cacheService = cacheService;
    }

    public bool IsEnabled(NotifyChannelConfig cfg) => cfg?.SignalR != false;

    public async Task<FlowNotifyPushResult> PushAsync(List<long> userIds, FlowNotification notification)
    {
        try
        {
            var onlineUsers = _cacheService.HashGetAll<SysOnlineUser>(CacheConst.KeyUserOnline);
            var connectionIds = onlineUsers
                .Where(u => userIds.Contains(u.Value.UserId))
                .Select(u => u.Value.ConnectionId)
                .ToList();

            if (connectionIds.Count == 0)
                return FlowNotifyPushResult.Ok(0);

            await _hubContext.Clients.Clients(connectionIds).ReceiveMessage(new
            {
                title = notification.Title,
                message = notification.Content,
                type = notification.Type.ToString(),
                instanceId = notification.InstanceId,
            });
            return FlowNotifyPushResult.Ok(connectionIds.Count);
        }
        catch (Exception ex)
        {
            return FlowNotifyPushResult.Fail(ex.Message);
        }
    }
}