using System;

​

namespace Exodus

{

    public static class Program

    {

        public static void Main()

        {

            for (int i = 0; i < 84; ++i)

            {

                var vanadielTime = new VanadielTime(1587675706549, i);

                Console.WriteLine(vanadielTime);

            }

        }

    }

    public enum Day : int

    {

        Firesday,

        Earthsday,

        Watersday,

        Windsday,

        Iceday,

        Lightningday,

        Lightsday,

        Darksday

    }

​

    public enum MoonPhase : int

    {

        NewMoon,

        WaxingCrescent,

        WaxingCrescent2,

        FirstQuarterMoon,

        WaxingGibbous,

        WaxingGibbous2,

        FullMoon,

        WaningGibbous,

        WaningGibbous2,

        LastQuarterMoon,

        WaningCrescent,

        WaningCrescent2

    }

​

    public enum Season : int

    {

        Winter,

        Spring,

        Summer,

        Autumn

    }

    public struct Moon

    {

        private long _lunation;

​

        public Moon(long time)

        {

            _lunation = (time / VanadielTime.MillisecondsPerDay + 26) % 84;

        }

        public int Percent => (int)Math.Round(Math.Abs((42 - _lunation) * 100.0d / 42));

        public MoonPhase Phase

        {

            get

            {

                long phase = _lunation > 38 ? _lunation - 38 : _lunation + 46;

                return (MoonPhase)((phase / 7) % 12);

            }

        }

    }

​

    public struct VanadielTime

    {

        public const long EarthTimeMilliseconds    = 1009810800000;    // 2002-01-01T00:00:00+09:00

​

        // Vana'diel time scale is 1/25 Earth time

        // https://ffxiclopedia.fandom.com/wiki/Time

        public const long MillisecondsPerDay       = 3456000;          // MillisecondsPerHour * 24

        public const long MillisecondsPerHour      = 144000;           // MillisecondsPerMinute * 60

        public const long MillisecondsPerLunation  = 290304000;        // MillisecondsPerDay * 84

        public const long MillisecondsPerMinute    = 2400;             // 2.4 Earth seconds

        public const long MillisecondsPerMonth     = 103680000;        // MillisecondsPerDay * 30

        public const long MillisecondsPerSeason    = 311040000;        // MillisecondsPerDay * 90

        public const long MillisecondsPerSecond    = 40;               // 0.04 Earth seconds

        public const long MillisecondsPerWeek      = 27648000;         // MillisecondsPerDay * 8

        public const long MillisecondsPerYear      = 1244160000;       // MillisecondsPerDay * 360

​

        public const long VanadielTimeMilliseconds = 1102325760000;    // 1/1/886, Firesday, 00:00

​

        private long _time;

​

        public VanadielTime(long time, int i)

        {

            if (time < 0)

                throw new ArgumentOutOfRangeException(nameof(time));

​

            _time = time - EarthTimeMilliseconds + VanadielTimeMilliseconds + (i * MillisecondsPerDay);

        }

​

        public int Day => (int)((_time / MillisecondsPerDay) % 30) + 1; // day of the month - [1, 30]

        public Day DayOfWeek => (Day)((_time / MillisecondsPerDay) % 8); // days since Firesday - [0, 7]

        public int DayOfYear => (int)((_time / MillisecondsPerDay) % 360) + 1; // days since January 1 - [1, 360]

        public int Hour => (int)((_time / MillisecondsPerHour) % 24); // hours since midnight - [0, 23]

        public bool IsAutumn => Season == Season.Autumn;

        public bool IsDarksday => DayOfWeek == Exodus.Day.Darksday;

        public bool IsEarthsday => DayOfWeek == Exodus.Day.Earthsday;

        public bool IsFiresday => DayOfWeek == Exodus.Day.Firesday;

        public bool IsIceday => DayOfWeek == Exodus.Day.Iceday;

        public bool IsLightningday => DayOfWeek == Exodus.Day.Lightningday;

        public bool IsLightsday => DayOfWeek == Exodus.Day.Lightsday;

        public bool IsSpring => Season == Season.Spring;

        public bool IsSummer => Season == Season.Summer;

        public bool IsWatersday => DayOfWeek == Exodus.Day.Watersday;

        public bool IsWindsday => DayOfWeek == Exodus.Day.Windsday;

        public bool IsWinter => Season == Season.Winter;

        public int Minute => (int)((_time / MillisecondsPerMinute) % 60); // minutes after the hour - [0, 59]

        public int Month => (int)((_time / MillisecondsPerMonth) % 12) + 1; // months since January - [1, 12]

        public Season Season => (Season)((_time / MillisecondsPerSeason) % 4);

        public int Second => (int)((_time / MillisecondsPerSecond) % 60); // seconds after the minute - [0, 59]

        public int Year => (int)(_time / MillisecondsPerYear); // years since 0

        public Moon Moon => new Moon(_time);

​

        public override string ToString() => $"{Month}/{Day}/{Year}, {DayOfWeek}, {Hour.ToString("D2")}:{Minute.ToString("D2")} {Season} {Moon.Phase} ({Moon.Percent}%)";

    }

}