///
/// Copyright (c) 2020-2023 Sensus Slovensko a.s.
///
using System;
using System.Collections.Generic;
using FluentNHibernate.Cfg;
using FluentNHibernate.Cfg.Db;
using NHibernate;
using NHibernate.Cfg;
using NHibernate.Tool.hbm2ddl;
using Common;
using Events.Entities;

namespace Events
{
    public static class DB
    {
		/// <summary>
		/// Shared data (initially empty)
		/// </summary>
        public static string BenchName = "undefined";
        public static IList<Entities.Event> RecentEvents = null;
        static IList<Entities.Subscriber> allSubscribers = null;

        /// <summary>
        /// Set test bench name used in Events.Entities.Event constructors
        /// </summary>
        public static void SetBenchName(string benchName)
        {
            DB.BenchName = benchName;
        }

        /// <summary>
		/// Loads shared data from the database
		/// </summary>
        public static void LoadSubscribers(ISession session)
        {
            allSubscribers = session.QueryOver<Subscriber>().List();
        }

        /// <summary>
        /// Loads shared data from the database
        /// </summary>
        public static void LoadRecentEvents(ISession session, string benchName, int days)
        {
            BenchName = benchName;
            RecentEvents = session.QueryOver<Event>()
                                  .Where(e => (e.Bench == benchName))
                                  .And(e => (e.TimeStamp >= DateTime.Now - new TimeSpan(days, 0, 0, 0)))
                                  .List();
        }

        public static void SaveEvent(ISession session, Event evnt, SubscriberGroup groups)
        {
            if (allSubscribers == null) LoadSubscribers(session);

            IList<Subscriber> thisEventSubscribers = new List<Subscriber>();
            foreach (var s in allSubscribers)
            {
                if ((s.Groups & (long)groups) != 0)
                {
                    /// Subscriber 's' belongs to at least one of SubscriberGroup(s) in 'groups' bit field
                    thisEventSubscribers.Add(s);
                }
            }
            evnt.Subscribers = thisEventSubscribers;

            evnt.Bench = BenchName;
            session.SaveOrUpdate(evnt);
        }
    }
}