using IM_API.Domain.Events;
using IM_API.Dtos;
using IM_API.Hubs;
using IM_API.Tools;
using IM_API.VOs.Group;
using MassTransit;
using Microsoft.AspNetCore.SignalR;
using StackExchange.Redis;

namespace IM_API.Application.EventHandlers.GroupJoinHandler
{
    public class GroupJoinSignalrHandler : IConsumer<GroupJoinEvent>
    {
        private readonly IHubContext<ChatHub> _hub;
        private readonly IDatabase _redis;
        public GroupJoinSignalrHandler(IHubContext<ChatHub> hub, IConnectionMultiplexer connectionMultiplexer)
        {
            _hub = hub;
            _redis = connectionMultiplexer.GetDatabase();
        }

        public async Task Consume(ConsumeContext<GroupJoinEvent> context)
        {
            var @event = context.Message;
            string stramKey = StreamKeyBuilder.Group(@event.GroupId);
            //将用户加入群组通知
            var list = await _redis.SetMembersAsync(RedisKeys.GetConnectionIdKey(@event.UserId.ToString()));
            if(list != null && list.Length > 0)
            {
                var tasks = list.Select(connectionId =>
                    _hub.Groups.AddToGroupAsync(connectionId!, stramKey)
                ).ToList();

                await Task.WhenAll(tasks);
            }
            //发送通知给群成员
            var msg = new GroupJoinVo
            {
                GroupId = @event.GroupId,
                UserId = @event.UserId
            };
            await _hub.Clients.Group(stramKey).SendAsync("ReceiveMessage",new HubResponse<GroupJoinVo>("Event",msg));
        }
    }
}