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using System;
using System.Linq;
using StardewValley;
namespace StardewModdingAPI.Utilities
{
/// <summary>Represents a Stardew Valley date.</summary>
public class SDate : IEquatable<SDate>
{
/*********
** Fields
*********/
/// <summary>The internal season names in order.</summary>
private readonly string[] Seasons = { "spring", "summer", "fall", "winter" };
/// <summary>The number of seasons in a year.</summary>
private int SeasonsInYear => this.Seasons.Length;
/// <summary>The number of days in a season.</summary>
private readonly int DaysInSeason = 28;
/*********
** Accessors
*********/
/// <summary>The day of month.</summary>
public int Day { get; }
/// <summary>The season name.</summary>
public string Season { get; }
/// <summary>The year.</summary>
public int Year { get; }
/// <summary>The day of week.</summary>
public DayOfWeek DayOfWeek { get; }
/// <summary>The number of days since the game began (starting at 1 for the first day of spring in Y1).</summary>
public int DaysSinceStart { get; }
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
/// <param name="day">The day of month.</param>
/// <param name="season">The season name.</param>
/// <exception cref="ArgumentException">One of the arguments has an invalid value (like day 35).</exception>
public SDate(int day, string season)
: this(day, season, Game1.year) { }
/// <summary>Construct an instance.</summary>
/// <param name="day">The day of month.</param>
/// <param name="season">The season name.</param>
/// <param name="year">The year.</param>
/// <exception cref="ArgumentException">One of the arguments has an invalid value (like day 35).</exception>
public SDate(int day, string season, int year)
: this(day, season, year, allowDayZero: false) { }
/// <summary>Get the current in-game date.</summary>
public static SDate Now()
{
return new SDate(Game1.dayOfMonth, Game1.currentSeason, Game1.year, allowDayZero: true);
}
/// <summary>Get a new date with the given number of days added.</summary>
/// <param name="offset">The number of days to add.</param>
/// <returns>Returns the resulting date.</returns>
/// <exception cref="ArithmeticException">The offset would result in an invalid date (like year 0).</exception>
public SDate AddDays(int offset)
{
// get new hash code
int hashCode = this.DaysSinceStart + offset;
if (hashCode < 1)
throw new ArithmeticException($"Adding {offset} days to {this} would result in a date before 01 spring Y1.");
// get day
int day = hashCode % 28;
if (day == 0)
day = 28;
// get season index
int seasonIndex = hashCode / 28;
if (seasonIndex > 0 && hashCode % 28 == 0)
seasonIndex -= 1;
seasonIndex %= 4;
// get year
int year = hashCode / (this.Seasons.Length * this.DaysInSeason) + 1;
// create date
return new SDate(day, this.Seasons[seasonIndex], year);
}
/// <summary>Get a string representation of the date. This is mainly intended for debugging or console messages.</summary>
public override string ToString()
{
return $"{this.Day:00} {this.Season} Y{this.Year}";
}
/****
** IEquatable
****/
/// <summary>Get whether this instance is equal to another.</summary>
/// <param name="other">The other value to compare.</param>
public bool Equals(SDate other)
{
return this == other;
}
/// <summary>Get whether this instance is equal to another.</summary>
/// <param name="obj">The other value to compare.</param>
public override bool Equals(object obj)
{
return obj is SDate other && this == other;
}
/// <summary>Get a hash code which uniquely identifies a date.</summary>
public override int GetHashCode()
{
return this.DaysSinceStart;
}
/****
** Operators
****/
/// <summary>Get whether one date is equal to another.</summary>
/// <param name="date">The base date to compare.</param>
/// <param name="other">The other date to compare.</param>
/// <returns>The equality of the dates</returns>
public static bool operator ==(SDate date, SDate other)
{
return date?.DaysSinceStart == other?.DaysSinceStart;
}
/// <summary>Get whether one date is not equal to another.</summary>
/// <param name="date">The base date to compare.</param>
/// <param name="other">The other date to compare.</param>
public static bool operator !=(SDate date, SDate other)
{
return date?.DaysSinceStart != other?.DaysSinceStart;
}
/// <summary>Get whether one date is more than another.</summary>
/// <param name="date">The base date to compare.</param>
/// <param name="other">The other date to compare.</param>
public static bool operator >(SDate date, SDate other)
{
return date?.DaysSinceStart > other?.DaysSinceStart;
}
/// <summary>Get whether one date is more than or equal to another.</summary>
/// <param name="date">The base date to compare.</param>
/// <param name="other">The other date to compare.</param>
public static bool operator >=(SDate date, SDate other)
{
return date?.DaysSinceStart >= other?.DaysSinceStart;
}
/// <summary>Get whether one date is less than or equal to another.</summary>
/// <param name="date">The base date to compare.</param>
/// <param name="other">The other date to compare.</param>
public static bool operator <=(SDate date, SDate other)
{
return date?.DaysSinceStart <= other?.DaysSinceStart;
}
/// <summary>Get whether one date is less than another.</summary>
/// <param name="date">The base date to compare.</param>
/// <param name="other">The other date to compare.</param>
public static bool operator <(SDate date, SDate other)
{
return date?.DaysSinceStart < other?.DaysSinceStart;
}
/*********
** Private methods
*********/
/// <summary>Construct an instance.</summary>
/// <param name="day">The day of month.</param>
/// <param name="season">The season name.</param>
/// <param name="year">The year.</param>
/// <param name="allowDayZero">Whether to allow 0 spring Y1 as a valid date.</param>
/// <exception cref="ArgumentException">One of the arguments has an invalid value (like day 35).</exception>
private SDate(int day, string season, int year, bool allowDayZero)
{
// validate
if (season == null)
throw new ArgumentNullException(nameof(season));
if (!this.Seasons.Contains(season))
throw new ArgumentException($"Unknown season '{season}', must be one of [{string.Join(", ", this.Seasons)}].");
if (day < 0 || day > this.DaysInSeason)
throw new ArgumentException($"Invalid day '{day}', must be a value from 1 to {this.DaysInSeason}.");
if(day == 0 && !(allowDayZero && this.IsDayZero(day, season, year)))
throw new ArgumentException($"Invalid day '{day}', must be a value from 1 to {this.DaysInSeason}.");
if (year < 1)
throw new ArgumentException($"Invalid year '{year}', must be at least 1.");
// initialise
this.Day = day;
this.Season = season;
this.Year = year;
this.DayOfWeek = this.GetDayOfWeek(day);
this.DaysSinceStart = this.GetDaysSinceStart(day, season, year);
}
/// <summary>Get whether a date represents 0 spring Y1, which is the date during the in-game intro.</summary>
/// <param name="day">The day of month.</param>
/// <param name="season">The season name.</param>
/// <param name="year">The year.</param>
private bool IsDayZero(int day, string season, int year)
{
return day == 0 && season == "spring" && year == 1;
}
/// <summary>Get the day of week for a given date.</summary>
/// <param name="day">The day of month.</param>
private DayOfWeek GetDayOfWeek(int day)
{
switch (day % 7)
{
case 0:
return DayOfWeek.Sunday;
case 1:
return DayOfWeek.Monday;
case 2:
return DayOfWeek.Tuesday;
case 3:
return DayOfWeek.Wednesday;
case 4:
return DayOfWeek.Thursday;
case 5:
return DayOfWeek.Friday;
case 6:
return DayOfWeek.Saturday;
default:
return 0;
}
}
/// <summary>Get the number of days since the game began (starting at 1 for the first day of spring in Y1).</summary>
/// <param name="day">The day of month.</param>
/// <param name="season">The season name.</param>
/// <param name="year">The year.</param>
private int GetDaysSinceStart(int day, string season, int year)
{
// return the number of days since 01 spring Y1 (inclusively)
int yearIndex = year - 1;
return
yearIndex * this.DaysInSeason * this.SeasonsInYear
+ this.GetSeasonIndex(season) * this.DaysInSeason
+ day;
}
/// <summary>Get a season index.</summary>
/// <param name="season">The season name.</param>
/// <exception cref="InvalidOperationException">The current season wasn't recognised.</exception>
private int GetSeasonIndex(string season)
{
int index = Array.IndexOf(this.Seasons, season);
if (index == -1)
throw new InvalidOperationException($"The season '{season}' wasn't recognised.");
return index;
}
}
}
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