using System;
using System.Linq;
using Luticate2.Utils.Hubs;
using Microsoft.AspNetCore.SignalR;
using Microsoft.AspNetCore.SignalR.Infrastructure;

namespace Luticate2.Utils.Business
{
    public class LuNotificationsBusiness
    {
        private readonly LuHubConnectionTracker _connectionTracker;
        private readonly IHubContext _hubContext;

        public const string EventCreate = "EVENT_CREATE";

        public const string EventUpdate = "EVENT_UPDATE";

        public const string EventDelete = "EVENT_DELETE";

        public LuNotificationsBusiness(IConnectionManager connectionManager, LuHubConnectionTracker connectionTracker)
        {
            _connectionTracker = connectionTracker;
            _hubContext = connectionManager.GetHubContext<LuNotificationsHub>();
        }

        public void Notify(string eventName, string entityType, object oldEntity, object newEntity, Func<string, bool> filter = null)
        {
            var connectionsIds = _connectionTracker.Get<LuNotificationsHub>();
            var selectedIds = filter != null ? connectionsIds.Where(filter).ToList() : connectionsIds;
            _hubContext.Clients.Clients(selectedIds).notify(eventName, entityType, oldEntity, newEntity);
        }

        public void NotifyCreate(string entityType, object newEntity, Func<string, bool> filter = null)
        {
            Notify(EventCreate, entityType, null, newEntity, filter);
        }

        public void NotifyUpdate(string entityType, object oldEntity, object newEntity, Func<string, bool> filter = null)
        {
            Notify(EventUpdate, entityType, oldEntity, newEntity, filter);
        }

        public void NotifyDelete(string entityType, object oldEntity, Func<string, bool> filter = null)
        {
            Notify(EventDelete, entityType, oldEntity, null, filter);
        }
    }
}