using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Timers;
using Microsoft.Win32;

namespace SafeMobileLib
{
    public static class MidnightNotifier
    {
        private static readonly Timer timer;

        static MidnightNotifier()
        {
            timer = new Timer(GetSleepTime());
            timer.Elapsed += (s, e) =>
            {
                OnDayChanged();
                timer.Interval = GetSleepTime();
            };
            timer.Start();

            SystemEvents.TimeChanged += OnSystemTimeChanged;
        }

        private static double GetSleepTime()
        {
            var midnightTonight = DateTime.Today.AddDays(1);
            var differenceInMilliseconds = (midnightTonight - DateTime.Now).TotalMilliseconds;
            return differenceInMilliseconds;
        }

        private static void OnDayChanged()
        {
            var handler = ItsMidnight;
            if (handler != null)
                handler(null, null);
        }

        private static void OnSystemTimeChanged(object sender, EventArgs e)
        {
            var handler = UserChangedDate;
            if (handler != null)
                handler(null, null);

            timer.Interval = GetSleepTime();
        }

        public static event EventHandler<EventArgs> UserChangedDate;
        public static event EventHandler<EventArgs> ItsMidnight;
    }
}