FixLocaleIssues.cs

using System;
using System.Globalization;
using AquaMai.Config.Attributes;
using HarmonyLib;
using JetBrains.Annotations;
using Manager;

namespace AquaMai.Mods.Fix;

// Fixes various locale issues that pop up if the game runs in a different locale than ja-JP.
[ConfigSection(exampleHidden: true, defaultOn: true)]
public class FixLocaleIssues
{
    private static readonly CultureInfo JapanCultureInfo = new CultureInfo("ja-JP");
    [CanBeNull] private static TimeZoneInfo _tokyoStandardTime;

    [HarmonyPrefix]
    [HarmonyPatch(typeof(int), "Parse", typeof(string))]
    private static bool int_Parse(ref int __result, string s)
    {
        __result = int.Parse(s, JapanCultureInfo);
        return false;
    }

    [HarmonyPrefix]
    [HarmonyPatch(typeof(float), "Parse", typeof(string))]
    private static bool float_Parse(ref float __result, string s)
    {
        __result = float.Parse(s, JapanCultureInfo);
        return false;
    }
    
    // Forces local timezone to be UTC+9, since segatools didn't patch it properly until recent versions,
    // which doesn't actually work well with maimai.
    [HarmonyPrefix]
    [HarmonyPatch(typeof(DateTime), "get_Now")]
    private static bool DateTime_get_Now(ref DateTime __result)
    {
        if (_tokyoStandardTime == null)
        {
            try
            {
                _tokyoStandardTime = TimeZoneInfo.FindSystemTimeZoneById("Tokyo Standard Time");
            }
            catch (Exception e) when (e is TimeZoneNotFoundException or InvalidTimeZoneException)
            {
                _tokyoStandardTime = TimeZoneInfo.CreateCustomTimeZone(
                    "Tokyo Standard Time",
                    TimeManager.JpTime,
                    "(UTC+09:00) Osaka, Sapporo, Tokyo",
                    "Tokyo Standard Time",
                    "Tokyo Daylight Time",
                    null,
                    true);
            }
        }

        __result = TimeZoneInfo.ConvertTimeFromUtc(DateTime.UtcNow, _tokyoStandardTime!);
        return false;
    }

    [HarmonyPrefix]
    [HarmonyPatch(typeof(DateTime), "Parse", typeof(string))]
    private static bool DateTime_Parse(ref DateTime __result, string s)
    {
        __result = DateTime.Parse(s, JapanCultureInfo);
        return false;
    }

    [HarmonyPrefix]
    [HarmonyPatch(typeof(DateTime), "ToShortDateString")]
    private static bool DateTime_ToShortDateString(DateTime __instance, ref string __result)
    {
        __result = __instance.ToString("d", JapanCultureInfo);
        return false;
    }
}