DiscoBot/DiscoBot/gsmeet/GSMeetingTimers.cs

using Discord.WebSocket;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Timers;

namespace DiscoBot.gsmeet
{
    public class GSMeetingTimers
    {
        private List<TimeSpan> WarningTimes = new List<TimeSpan> { 
            new TimeSpan(2, 0, 0, 0),
            new TimeSpan(1, 0, 0, 0) };
        private List<TimeSpan> UserTimes = new List<TimeSpan> { 
            new TimeSpan(7, 0, 0, 0),
            new TimeSpan(6, 0, 0, 0),
            new TimeSpan(5, 0, 0, 0),
            new TimeSpan(4, 0, 0, 0),
            new TimeSpan(3, 0, 0, 0) };
        private Dictionary<DateTimeOffset, GSEventTimers> events = new Dictionary<DateTimeOffset, GSEventTimers>();
        public GSMeetingTimers()
        {
        }
        public void UpdateTimers(SocketTextChannel chan, GSMeeting meeting)
        {
            for(var i=0;i<meeting.Dates.Count;++i)
            {
                var date = meeting.Dates[i];
                // Keep this so we can use it to pick from user.Signups later! (async)
                var idx = i;
                GSEventTimers evt;
                if(events.ContainsKey(date))
                {
                    evt = events[date];
                } else
                {
                    evt = new GSEventTimers();
                    events.Add(date, evt);
                }

                foreach(var t in evt.UserTimers)
                {
                    t.Dispose();
                }

                evt.UserTimers = new List<Timer>();
                
                foreach(var ts in UserTimes)
                {
                    var when = date - ts;
                    if(when < DateTimeOffset.Now)
                    {
                        continue;
                    }
                    Console.WriteLine("Setting a timer for " + when + " for evt " + date);
                    var whents = when - DateTimeOffset.Now;
                    // Debug resolve timers after 30s
                    //Timer t = new Timer(new TimeSpan(0, 0, 30).TotalMilliseconds);
                    Timer t = new Timer(whents.TotalMilliseconds);
                    t.AutoReset = false;
                    var users = meeting.Users;
                    t.Elapsed += async (sender, e) =>
                    {
                        foreach(var user in users)
                        {                            
                            if(user.Signups[idx] != "1" && user.Signups[idx] != "0" && user.Signups[idx] != "0.5")
                            {
                                if(user.User != null) {
                                    await chan.SendMessageAsync("Hey " + user.User.Mention + " could you please sign up for our raid on " + date + "?");
                                } else
                                {
                                    await chan.SendMessageAsync("Hey " + user.Name + " could you please sign up for our raid on " + date + "?");
                                }
                            }
                        }
                    };
                    t.Start();
                    evt.UserTimers.Add(t);
                }
            }
        }
    }

    public class GSEventTimers
    {
        public GSEventTimers()
        {
            this.UserTimers = new List<Timer>();
            this.WarningTimers = new List<Timer>();
        }
        public List<Timer> UserTimers { get; set; }
        public List<Timer> WarningTimers { get; set; }
    }
}