sebastienros.jint/Jint/Native/Date/DatePrototype.cs

#pragma warning disable CA1859 // Use concrete types when possible for improved performance -- most of prototype methods return JsValue

using System.Globalization;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using Jint.Collections;
using Jint.Native.Object;
using Jint.Native.Symbol;
using Jint.Runtime;
using Jint.Runtime.Descriptors;
using Jint.Runtime.Interop;

namespace Jint.Native.Date;

/// <summary>
/// https://tc39.es/ecma262/#sec-properties-of-the-date-prototype-object
/// </summary>
internal sealed class DatePrototype : Prototype
{
    // ES6 section 20.3.1.1 Time Values and Time Range
    private const double MinYear = -1000000.0;
    private const double MaxYear = -MinYear;
    private const double MinMonth = -10000000.0;
    private const double MaxMonth = -MinMonth;

    private readonly DateConstructor _constructor;
    private readonly ITimeSystem _timeSystem;

    internal DatePrototype(
        Engine engine,
        DateConstructor constructor,
        ObjectPrototype objectPrototype)
        : base(engine, engine.Realm)
    {
        _prototype = objectPrototype;
        _constructor = constructor;
        _timeSystem = engine.Options.TimeSystem;
    }

    protected override  void Initialize()
    {
        const PropertyFlag lengthFlags = PropertyFlag.Configurable;
        const PropertyFlag propertyFlags = PropertyFlag.Configurable | PropertyFlag.Writable;

        var properties = new PropertyDictionary(50, checkExistingKeys: false)
        {
            ["constructor"] = new PropertyDescriptor(_constructor, PropertyFlag.NonEnumerable),
            ["toString"] = new PropertyDescriptor(new ClrFunction(Engine, "toString", ToString, 0, lengthFlags), propertyFlags),
            ["toDateString"] = new PropertyDescriptor(new ClrFunction(Engine, "toDateString", ToDateString, 0, lengthFlags), propertyFlags),
            ["toTimeString"] = new PropertyDescriptor(new ClrFunction(Engine, "toTimeString", ToTimeString, 0, lengthFlags), propertyFlags),
            ["toLocaleString"] = new PropertyDescriptor(new ClrFunction(Engine, "toLocaleString", ToLocaleString, 0, lengthFlags), propertyFlags),
            ["toLocaleDateString"] = new PropertyDescriptor(new ClrFunction(Engine, "toLocaleDateString", ToLocaleDateString, 0, lengthFlags), propertyFlags),
            ["toLocaleTimeString"] = new PropertyDescriptor(new ClrFunction(Engine, "toLocaleTimeString", ToLocaleTimeString, 0, lengthFlags), propertyFlags),
            ["valueOf"] = new PropertyDescriptor(new ClrFunction(Engine, "valueOf", ValueOf, 0, lengthFlags), propertyFlags),
            ["getTime"] = new PropertyDescriptor(new ClrFunction(Engine, "getTime", GetTime, 0, lengthFlags), propertyFlags),
            ["getFullYear"] = new PropertyDescriptor(new ClrFunction(Engine, "getFullYear", GetFullYear, 0, lengthFlags), propertyFlags),
            ["getYear"] = new PropertyDescriptor(new ClrFunction(Engine, "getYear", GetYear, 0, lengthFlags), propertyFlags),
            ["getUTCFullYear"] = new PropertyDescriptor(new ClrFunction(Engine, "getUTCFullYear", GetUTCFullYear, 0, lengthFlags), propertyFlags),
            ["getMonth"] = new PropertyDescriptor(new ClrFunction(Engine, "getMonth", GetMonth, 0, lengthFlags), propertyFlags),
            ["getUTCMonth"] = new PropertyDescriptor(new ClrFunction(Engine, "getUTCMonth", GetUTCMonth, 0, lengthFlags), propertyFlags),
            ["getDate"] = new PropertyDescriptor(new ClrFunction(Engine, "getDate", GetDate, 0, lengthFlags), propertyFlags),
            ["getUTCDate"] = new PropertyDescriptor(new ClrFunction(Engine, "getUTCDate", GetUTCDate, 0, lengthFlags), propertyFlags),
            ["getDay"] = new PropertyDescriptor(new ClrFunction(Engine, "getDay", GetDay, 0, lengthFlags), propertyFlags),
            ["getUTCDay"] = new PropertyDescriptor(new ClrFunction(Engine, "getUTCDay", GetUTCDay, 0, lengthFlags), propertyFlags),
            ["getHours"] = new PropertyDescriptor(new ClrFunction(Engine, "getHours", GetHours, 0, lengthFlags), propertyFlags),
            ["getUTCHours"] = new PropertyDescriptor(new ClrFunction(Engine, "getUTCHours", GetUTCHours, 0, lengthFlags), propertyFlags),
            ["getMinutes"] = new PropertyDescriptor(new ClrFunction(Engine, "getMinutes", GetMinutes, 0, lengthFlags), propertyFlags),
            ["getUTCMinutes"] = new PropertyDescriptor(new ClrFunction(Engine, "getUTCMinutes", GetUTCMinutes, 0, lengthFlags), propertyFlags),
            ["getSeconds"] = new PropertyDescriptor(new ClrFunction(Engine, "getSeconds", GetSeconds, 0, lengthFlags), propertyFlags),
            ["getUTCSeconds"] = new PropertyDescriptor(new ClrFunction(Engine, "getUTCSeconds", GetUTCSeconds, 0, lengthFlags), propertyFlags),
            ["getMilliseconds"] = new PropertyDescriptor(new ClrFunction(Engine, "getMilliseconds", GetMilliseconds, 0, lengthFlags), propertyFlags),
            ["getUTCMilliseconds"] = new PropertyDescriptor(new ClrFunction(Engine, "getUTCMilliseconds", GetUTCMilliseconds, 0, lengthFlags), propertyFlags),
            ["getTimezoneOffset"] = new PropertyDescriptor(new ClrFunction(Engine, "getTimezoneOffset", GetTimezoneOffset, 0, lengthFlags), propertyFlags),
            ["setTime"] = new PropertyDescriptor(new ClrFunction(Engine, "setTime", SetTime, 1, lengthFlags), propertyFlags),
            ["setMilliseconds"] = new PropertyDescriptor(new ClrFunction(Engine, "setMilliseconds", SetMilliseconds, 1, lengthFlags), propertyFlags),
            ["setUTCMilliseconds"] = new PropertyDescriptor(new ClrFunction(Engine, "setUTCMilliseconds", SetUTCMilliseconds, 1, lengthFlags), propertyFlags),
            ["setSeconds"] = new PropertyDescriptor(new ClrFunction(Engine, "setSeconds", SetSeconds, 2, lengthFlags), propertyFlags),
            ["setUTCSeconds"] = new PropertyDescriptor(new ClrFunction(Engine, "setUTCSeconds", SetUTCSeconds, 2, lengthFlags), propertyFlags),
            ["setMinutes"] = new PropertyDescriptor(new ClrFunction(Engine, "setMinutes", SetMinutes, 3, lengthFlags), propertyFlags),
            ["setUTCMinutes"] = new PropertyDescriptor(new ClrFunction(Engine, "setUTCMinutes", SetUTCMinutes, 3, lengthFlags), propertyFlags),
            ["setHours"] = new PropertyDescriptor(new ClrFunction(Engine, "setHours", SetHours, 4, lengthFlags), propertyFlags),
            ["setUTCHours"] = new PropertyDescriptor(new ClrFunction(Engine, "setUTCHours", SetUTCHours, 4, lengthFlags), propertyFlags),
            ["setDate"] = new PropertyDescriptor(new ClrFunction(Engine, "setDate", SetDate, 1, lengthFlags), propertyFlags),
            ["setUTCDate"] = new PropertyDescriptor(new ClrFunction(Engine, "setUTCDate", SetUTCDate, 1, lengthFlags), propertyFlags),
            ["setMonth"] = new PropertyDescriptor(new ClrFunction(Engine, "setMonth", SetMonth, 2, lengthFlags), propertyFlags),
            ["setUTCMonth"] = new PropertyDescriptor(new ClrFunction(Engine, "setUTCMonth", SetUTCMonth, 2, lengthFlags), propertyFlags),
            ["setFullYear"] = new PropertyDescriptor(new ClrFunction(Engine, "setFullYear", SetFullYear, 3, lengthFlags), propertyFlags),
            ["setYear"] = new PropertyDescriptor(new ClrFunction(Engine, "setYear", SetYear, 1, lengthFlags), propertyFlags),
            ["setUTCFullYear"] = new PropertyDescriptor(new ClrFunction(Engine, "setUTCFullYear", SetUTCFullYear, 3, lengthFlags), propertyFlags),
            ["toUTCString"] = new PropertyDescriptor(new ClrFunction(Engine, "toUTCString", ToUtcString, 0, lengthFlags), propertyFlags),
            ["toISOString"] = new PropertyDescriptor(new ClrFunction(Engine, "toISOString", ToISOString, 0, lengthFlags), propertyFlags),
            ["toJSON"] = new PropertyDescriptor(new ClrFunction(Engine, "toJSON", ToJson, 1, lengthFlags), propertyFlags)
        };
        SetProperties(properties);

        var symbols = new SymbolDictionary(1)
        {
            [GlobalSymbolRegistry.ToPrimitive] = new PropertyDescriptor(new ClrFunction(Engine, "[Symbol.toPrimitive]", ToPrimitive, 1, PropertyFlag.Configurable), PropertyFlag.Configurable),
        };
        SetSymbols(symbols);
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-date.prototype-@@toprimitive
    /// </summary>
    private JsValue ToPrimitive(JsValue thisObject, JsCallArguments arguments)
    {
        var oi = thisObject as ObjectInstance;
        if (oi is null)
        {
            ExceptionHelper.ThrowTypeError(_realm);
        }

        var hint = arguments.At(0);
        if (!hint.IsString())
        {
            ExceptionHelper.ThrowTypeError(_realm);
        }

        var hintString = hint.ToString();
        var tryFirst = Types.Empty;
        if (string.Equals(hintString, "default", StringComparison.Ordinal) || string.Equals(hintString, "string", StringComparison.Ordinal))
        {
            tryFirst = Types.String;
        }
        else  if (string.Equals(hintString, "number", StringComparison.Ordinal))
        {
            tryFirst = Types.Number;
        }
        else
        {
            ExceptionHelper.ThrowTypeError(_realm);
        }

        return TypeConverter.OrdinaryToPrimitive(oi, tryFirst);
    }

    private JsValue ValueOf(JsValue thisObject, JsCallArguments arguments)
    {
        return ThisTimeValue(thisObject).ToJsValue();
    }

    /// <summary>
    /// https://tc39.es/ecma262/#thistimevalue
    /// </summary>
    private DatePresentation ThisTimeValue(JsValue thisObject)
    {
        if (thisObject is JsDate dateInstance)
        {
            return dateInstance._dateValue;
        }

        ExceptionHelper.ThrowTypeError(_realm, "this is not a Date object");
        return default;
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-date.prototype.tostring
    /// </summary>
    internal JsValue ToString(JsValue thisObject, JsCallArguments arguments)
    {
        var tv = ThisTimeValue(thisObject);
        return ToDateString(tv);
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-date.prototype.todatestring
    /// </summary>
    private JsValue ToDateString(JsValue thisObject, JsCallArguments arguments)
    {
        var tv = ThisTimeValue(thisObject);

        if (tv.IsNaN)
        {
            return "Invalid Date";
        }

        var t = LocalTime(tv);
        return DateString(t);
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-todatestring
    /// </summary>
    private JsValue ToDateString(DatePresentation tv)
    {
        if (tv.IsNaN)
        {
            return "Invalid Date";
        }

        var t = LocalTime(tv);
        return DateString(t) + " " + TimeString(t) + TimeZoneString(tv);
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-date.prototype.totimestring
    /// </summary>
    private JsValue ToTimeString(JsValue thisObject, JsCallArguments arguments)
    {
        var tv = ThisTimeValue(thisObject);

        if (tv.IsNaN)
        {
            return "Invalid Date";
        }

        var t = LocalTime(tv);

        return TimeString(t) + TimeZoneString(tv);
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-date.prototype.tolocalestring
    /// </summary>
    private JsValue ToLocaleString(JsValue thisObject, JsCallArguments arguments)
    {
        var dateInstance = ThisTimeValue(thisObject);

        if (dateInstance.IsNaN)
        {
            return "Invalid Date";
        }

        return ToLocalTime(dateInstance).ToString("F", Engine.Options.Culture);
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-date.prototype.tolocaledatestring
    /// </summary>
    private JsValue ToLocaleDateString(JsValue thisObject, JsCallArguments arguments)
    {
        var dateInstance = ThisTimeValue(thisObject);

        if (dateInstance.IsNaN)
        {
            return "Invalid Date";
        }

        return ToLocalTime(dateInstance).ToString("D", Engine.Options.Culture);
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-date.prototype.tolocaletimestring
    /// </summary>
    private JsValue ToLocaleTimeString(JsValue thisObject, JsCallArguments arguments)
    {
        var dateInstance = ThisTimeValue(thisObject);

        if (dateInstance.IsNaN)
        {
            return "Invalid Date";
        }

        return ToLocalTime(dateInstance).ToString("T", Engine.Options.Culture);
    }

    private JsValue GetTime(JsValue thisObject, JsCallArguments arguments)
    {
        var t = ThisTimeValue(thisObject);
        if (t.IsNaN)
        {
            return JsNumber.DoubleNaN;
        }
        return t.ToJsValue();
    }

    private JsValue GetFullYear(JsValue thisObject, JsCallArguments arguments)
    {
        var t = ThisTimeValue(thisObject);
        if (t.IsNaN)
        {
            return JsNumber.DoubleNaN;
        }
        return YearFromTime(LocalTime(t));
    }

    private JsValue GetYear(JsValue thisObject, JsCallArguments arguments)
    {
        var t = ThisTimeValue(thisObject);
        if (t.IsNaN)
        {
            return JsNumber.DoubleNaN;
        }
        return YearFromTime(LocalTime(t)) - 1900;
    }

    private JsValue GetUTCFullYear(JsValue thisObject, JsCallArguments arguments)
    {
        var t = ThisTimeValue(thisObject);
        if (t.IsNaN)
        {
            return JsNumber.DoubleNaN;
        }
        return YearFromTime(t);
    }

    private JsValue GetMonth(JsValue thisObject, JsCallArguments arguments)
    {
        var t = ThisTimeValue(thisObject);
        if (t.IsNaN)
        {
            return JsNumber.DoubleNaN;
        }
        return MonthFromTime(LocalTime(t));
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-date.prototype.getutcmonth
    /// </summary>
    private JsValue GetUTCMonth(JsValue thisObject, JsCallArguments arguments)
    {
        var t = ThisTimeValue(thisObject);
        if (t.IsNaN)
        {
            return JsNumber.DoubleNaN;
        }
        return MonthFromTime(t);
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-date.prototype.getdate
    /// </summary>
    private JsValue GetDate(JsValue thisObject, JsCallArguments arguments)
    {
        var t = ThisTimeValue(thisObject);
        if (t.IsNaN)
        {
            return JsNumber.DoubleNaN;
        }
        return DateFromTime(LocalTime(t));
    }

    private JsValue GetUTCDate(JsValue thisObject, JsCallArguments arguments)
    {
        var t = ThisTimeValue(thisObject);
        if (t.IsNaN)
        {
            return JsNumber.DoubleNaN;
        }
        return DateFromTime(t);
    }

    private JsValue GetDay(JsValue thisObject, JsCallArguments arguments)
    {
        var t = ThisTimeValue(thisObject);
        if (t.IsNaN)
        {
            return JsNumber.DoubleNaN;
        }
        return WeekDay(LocalTime(t));
    }

    private JsValue GetUTCDay(JsValue thisObject, JsCallArguments arguments)
    {
        var t = ThisTimeValue(thisObject);
        if (t.IsNaN)
        {
            return JsNumber.DoubleNaN;
        }
        return WeekDay(t);
    }

    private JsValue GetHours(JsValue thisObject, JsCallArguments arguments)
    {
        var t = ThisTimeValue(thisObject);
        if (t.IsNaN)
        {
            return JsNumber.DoubleNaN;
        }
        return HourFromTime(LocalTime(t));
    }

    private JsValue GetUTCHours(JsValue thisObject, JsCallArguments arguments)
    {
        var t = ThisTimeValue(thisObject);
        if (t.IsNaN)
        {
            return JsNumber.DoubleNaN;
        }
        return HourFromTime(t);
    }

    private JsValue GetMinutes(JsValue thisObject, JsCallArguments arguments)
    {
        var t = ThisTimeValue(thisObject);
        if (t.IsNaN)
        {
            return JsNumber.DoubleNaN;
        }
        return MinFromTime(LocalTime(t));
    }

    private JsValue GetUTCMinutes(JsValue thisObject, JsCallArguments arguments)
    {
        var t = ThisTimeValue(thisObject);
        if (t.IsNaN)
        {
            return JsNumber.DoubleNaN;
        }
        return MinFromTime(t);
    }

    private JsValue GetSeconds(JsValue thisObject, JsCallArguments arguments)
    {
        var t = ThisTimeValue(thisObject);
        if (t.IsNaN)
        {
            return JsNumber.DoubleNaN;
        }
        return SecFromTime(LocalTime(t));
    }

    private JsValue GetUTCSeconds(JsValue thisObject, JsCallArguments arguments)
    {
        var t = ThisTimeValue(thisObject);
        if (t.IsNaN)
        {
            return JsNumber.DoubleNaN;
        }
        return SecFromTime(t);
    }

    private JsValue GetMilliseconds(JsValue thisObject, JsCallArguments arguments)
    {
        var t = ThisTimeValue(thisObject);
        if (t.IsNaN)
        {
            return JsNumber.DoubleNaN;
        }
        return MsFromTime(LocalTime(t));
    }

    private JsValue GetUTCMilliseconds(JsValue thisObject, JsCallArguments arguments)
    {
        var t = ThisTimeValue(thisObject);
        if (t.IsNaN)
        {
            return JsNumber.DoubleNaN;
        }
        return MsFromTime(t);
    }

    private JsValue GetTimezoneOffset(JsValue thisObject, JsCallArguments arguments)
    {
        var t = ThisTimeValue(thisObject);
        if (t.IsNaN)
        {
            return JsNumber.DoubleNaN;
        }
        return (int) ((double) t.Value - LocalTime(t).Value)/MsPerMinute;
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-date.prototype.settime
    /// </summary>
    private JsValue SetTime(JsValue thisObject, JsCallArguments arguments)
    {
        ThisTimeValue(thisObject);
        var t = TypeConverter.ToNumber(arguments.At(0));
        var v = t.TimeClip();

        ((JsDate) thisObject)._dateValue = t;
        return v.ToJsValue();
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-date.prototype.setmilliseconds
    /// </summary>
    private JsValue SetMilliseconds(JsValue thisObject, JsCallArguments arguments)
    {
        var t = LocalTime(ThisTimeValue(thisObject));
        var ms = TypeConverter.ToNumber(arguments.At(0));

        if (t.IsNaN)
        {
            return JsNumber.DoubleNaN;
        }

        var time = MakeTime(HourFromTime(t), MinFromTime(t), SecFromTime(t), ms);
        var u = Utc(MakeDate(Day(t), time)).TimeClip();
        ((JsDate) thisObject)._dateValue = u;
        return u.ToJsValue();
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-date.prototype.setutcmilliseconds
    /// </summary>
    private JsValue SetUTCMilliseconds(JsValue thisObject, JsCallArguments arguments)
    {
        var t = ThisTimeValue(thisObject);
        var milli = TypeConverter.ToNumber(arguments.At(0));

        if (t.IsNaN)
        {
            return double.NaN;
        }

        var time = MakeTime(HourFromTime(t), MinFromTime(t), SecFromTime(t), milli);
        var u = MakeDate(Day(t), time).TimeClip();
        ((JsDate) thisObject)._dateValue = u;
        return u.ToJsValue();
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-date.prototype.setseconds
    /// </summary>
    private JsValue SetSeconds(JsValue thisObject, JsCallArguments arguments)
    {
        var t = LocalTime(ThisTimeValue(thisObject));
        var s = TypeConverter.ToNumber(arguments.At(0));
        var milli = arguments.Length <= 1 ? MsFromTime(t) : TypeConverter.ToNumber(arguments.At(1));

        if (t.IsNaN)
        {
            return JsNumber.DoubleNaN;
        }

        var date = MakeDate(Day(t), MakeTime(HourFromTime(t), MinFromTime(t), s, milli));
        var u = Utc(date).TimeClip();
        ((JsDate) thisObject)._dateValue = u;
        return u.ToJsValue();
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-date.prototype.setutcseconds
    /// </summary>
    private JsValue SetUTCSeconds(JsValue thisObject, JsCallArguments arguments)
    {
        var t = ThisTimeValue(thisObject);
        var s = TypeConverter.ToNumber(arguments.At(0));
        var milli = arguments.Length <= 1 ? MsFromTime(t) : TypeConverter.ToNumber(arguments.At(1));

        if (t.IsNaN)
        {
            return JsNumber.DoubleNaN;
        }

        var date = MakeDate(Day(t), MakeTime(HourFromTime(t), MinFromTime(t), s, milli));
        var u = date.TimeClip();
        ((JsDate) thisObject)._dateValue = u;
        return u.ToJsValue();
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-date.prototype.setminutes
    /// </summary>
    private JsValue SetMinutes(JsValue thisObject, JsCallArguments arguments)
    {
        var t = LocalTime(ThisTimeValue(thisObject));
        var m = TypeConverter.ToNumber(arguments.At(0));
        var s = arguments.Length <= 1 ? SecFromTime(t) : TypeConverter.ToNumber(arguments.At(1));
        var milli = arguments.Length <= 2 ? MsFromTime(t) : TypeConverter.ToNumber(arguments.At(2));

        if (t.IsNaN)
        {
            return JsNumber.DoubleNaN;
        }

        var date = MakeDate(Day(t), MakeTime(HourFromTime(t), m, s, milli));
        var u = Utc(date).TimeClip();
        ((JsDate) thisObject)._dateValue = u;
        return u.ToJsValue();
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-date.prototype.setutcminutes
    /// </summary>
    private JsValue SetUTCMinutes(JsValue thisObject, JsCallArguments arguments)
    {
        var t = ThisTimeValue(thisObject);
        var m = TypeConverter.ToNumber(arguments.At(0));
        var s = arguments.Length <= 1 ? SecFromTime(t) : TypeConverter.ToNumber(arguments.At(1));
        var milli = arguments.Length <= 2 ? MsFromTime(t) : TypeConverter.ToNumber(arguments.At(2));

        if (t.IsNaN)
        {
            return JsNumber.DoubleNaN;
        }

        var date = MakeDate(Day(t), MakeTime(HourFromTime(t), m, s, milli));
        var u = date.TimeClip();
        ((JsDate) thisObject)._dateValue = u;
        return u.ToJsValue();
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-date.prototype.sethours
    /// </summary>
    private JsValue SetHours(JsValue thisObject, JsCallArguments arguments)
    {
        var t = LocalTime(ThisTimeValue(thisObject));
        var h = TypeConverter.ToNumber(arguments.At(0));
        var m = arguments.Length <= 1 ? MinFromTime(t) : TypeConverter.ToNumber(arguments.At(1));
        var s = arguments.Length <= 2 ? SecFromTime(t) : TypeConverter.ToNumber(arguments.At(2));
        var milli = arguments.Length <= 3 ? MsFromTime(t) : TypeConverter.ToNumber(arguments.At(3));

        if (t.IsNaN)
        {
            return JsNumber.DoubleNaN;
        }

        var date = MakeDate(Day(t), MakeTime(h, m, s, milli));
        var u = Utc(date).TimeClip();
        ((JsDate) thisObject)._dateValue = u;
        return u.ToJsValue();
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-date.prototype.setutchours
    /// </summary>
    private JsValue SetUTCHours(JsValue thisObject, JsCallArguments arguments)
    {
        var t = ThisTimeValue(thisObject);
        var h = TypeConverter.ToNumber(arguments.At(0));
        var m = arguments.Length <= 1 ? MinFromTime(t) : TypeConverter.ToNumber(arguments.At(1));
        var s = arguments.Length <= 2 ? SecFromTime(t) : TypeConverter.ToNumber(arguments.At(2));
        var milli = arguments.Length <= 3 ? MsFromTime(t) : TypeConverter.ToNumber(arguments.At(3));

        if (t.IsNaN)
        {
            return JsNumber.DoubleNaN;
        }

        var newDate = MakeDate(Day(t), MakeTime(h, m, s, milli));
        var v = newDate.TimeClip();
        ((JsDate) thisObject)._dateValue = v;
        return v.ToJsValue();
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-date.prototype.setdate
    /// </summary>
    private JsValue SetDate(JsValue thisObject, JsCallArguments arguments)
    {
        var t = LocalTime(ThisTimeValue(thisObject));
        var dt = TypeConverter.ToNumber(arguments.At(0));

        if (t.IsNaN)
        {
            return JsNumber.DoubleNaN;
        }

        var (year, month, __) = YearMonthDayFromTime(t);
        var newDate = MakeDate(MakeDay(year, month, dt), TimeWithinDay(t));
        var u = Utc(newDate).TimeClip();
        ((JsDate) thisObject)._dateValue = u;
        return u.ToJsValue();
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-date.prototype.setutcdate
    /// </summary>
    private JsValue SetUTCDate(JsValue thisObject, JsCallArguments arguments)
    {
        var t = ThisTimeValue(thisObject);
        var dt = TypeConverter.ToNumber(arguments.At(0));

        if (t.IsNaN)
        {
            return JsNumber.DoubleNaN;
        }

        var newDate = MakeDate(MakeDay(YearFromTime(t), MonthFromTime(t), dt), TimeWithinDay(t));
        var u = newDate.TimeClip();
        ((JsDate) thisObject)._dateValue = u;
        return u.ToJsValue();
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-date.prototype.setmonth
    /// </summary>
    private JsValue SetMonth(JsValue thisObject, JsCallArguments arguments)
    {
        var t = LocalTime(ThisTimeValue(thisObject));
        var m = TypeConverter.ToNumber(arguments.At(0));
        var dt = arguments.Length <= 1 ? DateFromTime(t) : TypeConverter.ToNumber(arguments.At(1));

        if (t.IsNaN)
        {
            return JsNumber.DoubleNaN;
        }

        var newDate = MakeDate(MakeDay(YearFromTime(t), m, dt), TimeWithinDay(t));
        var u = Utc(newDate).TimeClip();
        ((JsDate) thisObject)._dateValue = u;
        return u.ToJsValue();
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-date.prototype.setutcmonth
    /// </summary>
    private JsValue SetUTCMonth(JsValue thisObject, JsCallArguments arguments)
    {
        var t = ThisTimeValue(thisObject);
        var m = TypeConverter.ToNumber(arguments.At(0));
        var dt = arguments.Length <= 1 ? DateFromTime(t) : TypeConverter.ToNumber(arguments.At(1));

        if (t.IsNaN)
        {
            return JsNumber.DoubleNaN;
        }

        var newDate = MakeDate(MakeDay(YearFromTime(t), m, dt), TimeWithinDay(t));
        var u = newDate.TimeClip();
        ((JsDate) thisObject)._dateValue = u;
        return u.ToJsValue();
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-date.prototype.setfullyear
    /// </summary>
    private JsValue SetFullYear(JsValue thisObject, JsCallArguments arguments)
    {
        var thisTime = ThisTimeValue(thisObject);
        var t = thisTime.IsNaN ? 0 : LocalTime(thisTime);
        var y = TypeConverter.ToNumber(arguments.At(0));
        var m = arguments.Length <= 1 ? MonthFromTime(t) : TypeConverter.ToNumber(arguments.At(1));
        var dt = arguments.Length <= 2 ? DateFromTime(t) : TypeConverter.ToNumber(arguments.At(2));

        var newDate = MakeDate(MakeDay(y, m, dt), TimeWithinDay(t));
        var u = Utc(newDate).TimeClip();
        ((JsDate) thisObject)._dateValue = u;
        return u.ToJsValue();
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-date.prototype.setyear
    /// </summary>
    private JsValue SetYear(JsValue thisObject, JsCallArguments arguments)
    {
        var thisTime = ThisTimeValue(thisObject);
        var t = thisTime.IsNaN ? 0 : LocalTime(thisTime);
        var y = TypeConverter.ToNumber(arguments.At(0));
        if (double.IsNaN(y))
        {
            ((JsDate) thisObject)._dateValue = double.NaN;
            return JsNumber.DoubleNaN;
        }

        var fy = TypeConverter.ToInteger(y);
        if (y >= 0 && y <= 99)
        {
            fy += 1900;
        }

        var newDate = MakeDay(fy, MonthFromTime(t), DateFromTime(t));
        var u = Utc(MakeDate(newDate, TimeWithinDay(t)));
        ((JsDate) thisObject)._dateValue = u.TimeClip();
        return u.ToJsValue();
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-date.prototype.setutcfullyear
    /// </summary>
    private JsValue SetUTCFullYear(JsValue thisObject, JsCallArguments arguments)
    {
        var thisTime = ThisTimeValue(thisObject);
        var t = thisTime.IsNaN ? 0 : thisTime;
        var y = TypeConverter.ToNumber(arguments.At(0));
        var m = arguments.Length <= 1 ? MonthFromTime(t) : TypeConverter.ToNumber(arguments.At(1));
        var dt = arguments.Length <= 2 ? DateFromTime(t) : TypeConverter.ToNumber(arguments.At(2));
        var newDate = MakeDate(MakeDay(y, m, dt), TimeWithinDay(t));
        var u = newDate.TimeClip();
        ((JsDate) thisObject)._dateValue = u;
        return u.ToJsValue();
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-date.prototype.toutcstring
    /// </summary>
    private JsValue ToUtcString(JsValue thisObject, JsCallArguments arguments)
    {
        var tv = ThisTimeValue(thisObject);
        if (!IsFinite(tv))
        {
            return "Invalid Date";
        }

        var weekday = _dayNames[WeekDay(tv)];
        var month = _monthNames[MonthFromTime(tv)];
        var day = DateFromTime(tv).ToString("00", CultureInfo.InvariantCulture);
        var yv = YearFromTime(tv);
        var paddedYear = yv.ToString("0000", CultureInfo.InvariantCulture);

        return $"{weekday}, {day} {month} {paddedYear} {TimeString(tv)}";
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-date.prototype.toisostring
    /// </summary>
    private JsValue ToISOString(JsValue thisObject, JsCallArguments arguments)
    {
        var thisTime = ThisTimeValue(thisObject);
        var t = thisTime;
        if (t.IsNaN)
        {
            ExceptionHelper.ThrowRangeError(_realm);
        }

        if (((JsDate) thisObject).DateTimeRangeValid)
        {
            // shortcut
            var dt = thisTime.ToDateTime();
            return $"{dt.Year:0000}-{dt.Month:00}-{dt.Day:00}T{dt.Hour:00}:{dt.Minute:00}:{dt.Second:00}.{dt.Millisecond:000}Z";
        }

        var h = HourFromTime(t);
        var m = MinFromTime(t);
        var s = SecFromTime(t);
        var ms = MsFromTime(t);
        if (h < 0) { h += HoursPerDay; }
        if (m < 0) { m += MinutesPerHour; }
        if (s < 0) { s += SecondsPerMinute; }
        if (ms < 0) { ms += MsPerSecond; }

        var (year, month, day) = YearMonthDayFromTime(t);
        month++;

        var formatted = $"{year:0000}-{month:00}-{day:00}T{h:00}:{m:00}:{s:00}.{ms:000}Z";
        if (year > 9999)
        {
            formatted = "+" + formatted;
        }

        return formatted;
    }

    private JsValue ToJson(JsValue thisObject, JsCallArguments arguments)
    {
        var o = TypeConverter.ToObject(_realm, thisObject);
        var tv = TypeConverter.ToPrimitive(o, Types.Number);
        if (tv.IsNumber() && !IsFinite(((JsNumber) tv)._value))
        {
            return Null;
        }

        return Invoke(o, "toISOString", Arguments.Empty);
    }

    private const int HoursPerDay = 24;
    private const int MinutesPerHour = 60;
    private const int SecondsPerMinute = 60;
    private const int MsPerSecond = 1000;
    private const int MsPerMinute = 60000;
    private const int MsPerHour = 3600000;
    private const long MsPerDay = 86400000;

    /// <summary>
    /// https://tc39.es/ecma262/#eqn-Day
    /// </summary>
    private static int Day(DatePresentation t)
    {
        return (int) System.Math.Floor((double) t.Value / MsPerDay);
    }

    /// <summary>
    /// https://tc39.es/ecma262/#eqn-Day
    /// </summary>
    private static long TimeWithinDay(DatePresentation t)
    {
        var result = t.Value % MsPerDay;

        if (result < 0)
        {
            result += MsPerDay;
        }

        return result;
    }

    /// <summary>
    /// The number of days in a year
    /// </summary>
    private static int DaysInYear(double y)
    {
        if (y%4 != 0)
        {
            return 365;
        }

        if (y%4 == 0 && y%100 != 0)
        {
            return 366;
        }

        if (y%100 == 0 && y%400 != 0)
        {
            return 365;
        }

        if (y%400 == 0)
        {
            return 366;
        }

        return 365;
    }

    /// <summary>
    /// The day number of the first day of the year.
    /// </summary>
    private static int DayFromYear(DatePresentation y)
    {
        return (int) (365*(y.Value - 1970)
                      + System.Math.Floor((y.Value - 1969)/4d)
                      - System.Math.Floor((y.Value - 1901)/100d)
                      + System.Math.Floor((y.Value - 1601)/400d));
    }

    /// <summary>
    /// The time value of the start of the year
    /// </summary>
    private static long TimeFromYear(DatePresentation y)
    {
        return MsPerDay*DayFromYear(y);
    }

    /// <summary>
    /// The year of a time value.
    /// </summary>
    private static int YearFromTime(DatePresentation t)
    {
        var (year, _, _) = YearMonthDayFromTime(t);
        return year;
    }

    /// <summary>
    /// <value>true</value> if the time is within a leap year, <value>false</value> otherwise
    /// </summary>
    private static int InLeapYear(DatePresentation t)
    {
        var daysInYear = DaysInYear(YearFromTime(t));

        if (daysInYear == 365)
        {
            return 0;
        }

        if (daysInYear == 366)
        {
            return 1;
        }

        ExceptionHelper.ThrowArgumentException();
        return 0;
    }

    /// <summary>
    /// The month number of a time value.
    /// </summary>
    private static int MonthFromTime(DatePresentation t)
    {
        var dayWithinYear = DayWithinYear(t);
        var inLeapYear = InLeapYear(t);

        if (dayWithinYear < 31)
        {
            return 0;
        }

        if (dayWithinYear < 59 + inLeapYear)
        {
            return 1;
        }

        if (dayWithinYear < 90 + inLeapYear)
        {
            return 2;
        }

        if (dayWithinYear < 120 + inLeapYear)
        {
            return 3;
        }

        if (dayWithinYear < 151 + inLeapYear)
        {
            return 4;
        }

        if (dayWithinYear < 181 + inLeapYear)
        {
            return 5;
        }

        if (dayWithinYear < 212 + inLeapYear)
        {
            return 6;
        }

        if (dayWithinYear < 243 + inLeapYear)
        {
            return 7;
        }

        if (dayWithinYear < 273 + inLeapYear)
        {
            return 8;
        }

        if (dayWithinYear < 304 + inLeapYear)
        {
            return 9;
        }

        if (dayWithinYear < 334 + inLeapYear)
        {
            return 10;
        }

        if (dayWithinYear < 365 + inLeapYear)
        {
            return 11;
        }

        ExceptionHelper.ThrowInvalidOperationException();
        return 0;
    }

    private static int DayWithinYear(DatePresentation t)
    {
        return Day(t) - DayFromYear(YearFromTime(t));
    }

    private static int DateFromTime(DatePresentation t)
    {
        var monthFromTime = MonthFromTime(t);
        var dayWithinYear = DayWithinYear(t);

        if (monthFromTime == 0)
        {
            return dayWithinYear + 1;
        }

        if (monthFromTime== 1)
        {
            return dayWithinYear - 30;
        }

        if (monthFromTime == 2)
        {
            return dayWithinYear - 58 - InLeapYear(t);
        }

        if (monthFromTime == 3)
        {
            return dayWithinYear - 89 - InLeapYear(t);
        }

        if (monthFromTime == 4)
        {
            return dayWithinYear - 119 - InLeapYear(t);
        }

        if (monthFromTime == 5)
        {
            return dayWithinYear - 150 - InLeapYear(t);
        }

        if (monthFromTime == 6)
        {
            return dayWithinYear - 180 - InLeapYear(t);
        }

        if (monthFromTime == 7)
        {
            return dayWithinYear - 211 - InLeapYear(t);
        }

        if (monthFromTime == 8)
        {
            return dayWithinYear - 242 - InLeapYear(t);
        }

        if (monthFromTime == 9)
        {
            return dayWithinYear - 272 - InLeapYear(t);
        }

        if (monthFromTime == 10)
        {
            return dayWithinYear - 303 - InLeapYear(t);
        }

        if (monthFromTime == 11)
        {
            return dayWithinYear - 333 - InLeapYear(t);
        }

        ExceptionHelper.ThrowInvalidOperationException();
        return 0;
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-week-day
    /// </summary>
    private static int WeekDay(DatePresentation t)
    {
        var result = (Day(t) + 4) % 7;
        return result >= 0 ? result : result + 7;
    }

    private DateTime ToLocalTime(DatePresentation t)
    {
        var utcOffset = _timeSystem.GetUtcOffset(t.Value).TotalMilliseconds;
        return (t + utcOffset).ToDateTime();
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-localtime
    /// </summary>
    private DatePresentation LocalTime(DatePresentation t)
    {
        if (t.IsNaN)
        {
            return DatePresentation.NaN;
        }

        var offset = _timeSystem.GetUtcOffset(t.Value).TotalMilliseconds;
        return t + offset;
    }

    internal DatePresentation Utc(DatePresentation t)
    {
        var offset = _timeSystem.GetUtcOffset(t.Value).TotalMilliseconds;
        return t - offset;
    }

    private static int HourFromTime(DatePresentation t)
    {
        var hours = System.Math.Floor((double) t.Value / MsPerHour) % HoursPerDay;

        if (hours < 0)
        {
            hours += HoursPerDay;
        }

        return (int) hours;
    }

    private static int MinFromTime(DatePresentation t)
    {
        var minutes = System.Math.Floor((double) t.Value / MsPerMinute) % MinutesPerHour;

        if (minutes < 0)
        {
            minutes += MinutesPerHour;
        }

        return (int) minutes;
    }

    private static int SecFromTime(DatePresentation t)
    {
        var seconds = System.Math.Floor((double) t.Value / MsPerSecond) % SecondsPerMinute;

        if (seconds < 0)
        {
            seconds += SecondsPerMinute;
        }

        return (int) seconds;
    }

    private static int MsFromTime(DatePresentation t)
    {
        var milli = t.Value % MsPerSecond;

        if (milli < 0)
        {
            milli += MsPerSecond;
        }

        return (int) milli;
    }

    internal static double MakeTime(double hour, double min, double sec, double ms)
    {
        if (!AreFinite(hour, min, sec, ms))
        {
            return double.NaN;
        }

        var h = TypeConverter.ToInteger(hour);
        var m = TypeConverter.ToInteger(min);
        var s = TypeConverter.ToInteger(sec);
        var milli = TypeConverter.ToInteger(ms);
        var t = h*MsPerHour + m*MsPerMinute + s*MsPerSecond + milli;

        return t;
    }

    private static readonly int[] _dayFromMonth = [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334];
    private static readonly int[] _dayFromMonthLeapYear = [0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335];

    internal static double MakeDay(double year, double month, double date)
    {
        if (year < MinYear || year > MaxYear || month < MinMonth || month > MaxMonth || !AreFinite(year, month, date))
        {
            return double.NaN;
        }

        var y = (long) TypeConverter.ToInteger(year);
        var m = (long) TypeConverter.ToInteger(month);
        var dt = (long) TypeConverter.ToInteger(date);

        y += m / 12;
        m %= 12;
        if (m < 0)
        {
            m += 12;
            y -= 1;
        }

        // kYearDelta is an arbitrary number such that:
        // a) kYearDelta = -1 (mod 400)
        // b) year + kYearDelta > 0 for years in the range defined by
        //    ECMA 262 - 15.9.1.1, i.e. upto 100,000,000 days on either side of
        //    Jan 1 1970. This is required so that we don't run into integer
        //    division of negative numbers.
        // c) there shouldn't be an overflow for 32-bit integers in the following
        //    operations.
        const int kYearDelta = 399999;
        const long kBaseDay =
            365 * (1970 + kYearDelta) + (1970 + kYearDelta) / 4 -
            (1970 + kYearDelta) / 100 + (1970 + kYearDelta) / 400;

        var dayFromYear = 365 * (y + kYearDelta) + (y + kYearDelta) / 4 -
            (y + kYearDelta) / 100 + (y + kYearDelta) / 400 - kBaseDay;

        if (y % 4 != 0 || (y % 100 == 0 && y % 400 != 0))
        {
            dayFromYear += _dayFromMonth[m];
        }
        else
        {
            dayFromYear += _dayFromMonthLeapYear[m];
        }

        return dayFromYear + dt - 1;
    }

    internal static DatePresentation MakeDate(double day, double time)
    {
        if (!AreFinite(day, time))
        {
            return DatePresentation.NaN;
        }

        return new DatePresentation((long) (day * MsPerDay + time), DateFlags.None);
    }

    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    private static bool IsFinite(double value) => !double.IsNaN(value) && !double.IsInfinity(value);

    private static bool AreFinite(double value1, double value2) => IsFinite(value1) && IsFinite(value2);

    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    private static bool IsFinite(DatePresentation value) => value.IsFinite;

    private static bool AreFinite(double value1, double value2, double value3)
        => IsFinite(value1) && IsFinite(value2) && IsFinite(value3);

    private static bool AreFinite(double value1, double value2, double value3, double value4)
        => IsFinite(value1) && IsFinite(value2) &&  IsFinite(value3) && IsFinite(value4);

    [StructLayout(LayoutKind.Auto)]
    private readonly record struct Date(int Year, int Month, int Day);

    private static readonly int[] kDaysInMonths = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];

    private static Date YearMonthDayFromTime(DatePresentation t) => YearMonthDayFromDays((long) System.Math.Floor(t.Value / 1000 / 60 / 60 / 24d));

    private static Date YearMonthDayFromDays(long days)
    {
        const int kDaysIn4Years = 4 * 365 + 1;
        const int kDaysIn100Years = 25 * kDaysIn4Years - 1;
        const int kDaysIn400Years = 4 * kDaysIn100Years + 1;
        const int kDays1970to2000 = 30 * 365 + 7;
        const int kDaysOffset = 1000 * kDaysIn400Years + 5 * kDaysIn400Years - kDays1970to2000;
        const int kYearsOffset = 400000;

        days += kDaysOffset;
        var year = 400 * (days / kDaysIn400Years) - kYearsOffset;
        days %= kDaysIn400Years;

        days--;
        var yd1 = days / kDaysIn100Years;
        days %= kDaysIn100Years;
        year += 100 * yd1;

        days++;
        var yd2 = days / kDaysIn4Years;
        days %= kDaysIn4Years;
        year += 4 * yd2;

        days--;
        var yd3 = days / 365;
        days %= 365;
        year += yd3;

        var is_leap = (yd1 == 0 || yd2 != 0) && yd3 == 0;

        days += is_leap ? 1 : 0;
        var month = 0;
        var day = 0;

        // Check if the date is after February.
        if (days >= 31 + 28 + (is_leap ? 1 : 0))
        {
            days -= 31 + 28 + (is_leap ? 1 : 0);
            // Find the date starting from March.
            for (int i = 2; i < 12; i++)
            {
                if (days < kDaysInMonths[i])
                {
                    month = i;
                    day = (int) (days + 1);
                    break;
                }

                days -= kDaysInMonths[i];
            }
        }
        else
        {
            // Check January and February.
            if (days < 31)
            {
                month = 0;
                day = (int) (days + 1);
            }
            else
            {
                month = 1;
                day = (int) (days - 31 + 1);
            }
        }

        return new Date((int) year, month, day);
    }

    private static readonly string[] _dayNames =
    [
        "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
    ];

    private static readonly string[] _monthNames =
    [
        "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
    ];

    /// <summary>
    /// https://tc39.es/ecma262/#sec-datestring
    /// </summary>
    private static string DateString(DatePresentation tv)
    {
        var weekday = _dayNames[WeekDay(tv)];
        var month = _monthNames[MonthFromTime(tv)];

        var dateFromTime = DateFromTime(tv);
        var day = System.Math.Max(1, dateFromTime).ToString("00", CultureInfo.InvariantCulture);
        var yv = YearFromTime(tv);
        var yearSign = yv < 0 ? "-" : "";
        var year = System.Math.Abs(yv);
        var paddedYear = year.ToString("0000", CultureInfo.InvariantCulture);

        return weekday + " " + month + " " + day + " " + yearSign + paddedYear;
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-timestring
    /// </summary>
    private static string TimeString(DatePresentation t)
    {
        var hour = HourFromTime(t).ToString("00", CultureInfo.InvariantCulture);
        var minute = MinFromTime(t).ToString("00", CultureInfo.InvariantCulture);
        var second = SecFromTime(t).ToString("00", CultureInfo.InvariantCulture);

        return hour + ":" + minute + ":" + second + " GMT";
    }

    /// <summary>
    /// https://tc39.es/ecma262/#sec-timezoneestring
    /// </summary>
    private string TimeZoneString(DatePresentation tv)
    {
        var offset = _timeSystem.GetUtcOffset(tv.Value).TotalMilliseconds;

        string offsetSign;
        double absOffset;
        if (offset >= 0)
        {
            offsetSign = "+";
            absOffset = offset;
        }
        else
        {
            offsetSign = "-";
            absOffset = -1 * offset;
        }

        var offsetMin = MinFromTime(absOffset).ToString("00", CultureInfo.InvariantCulture);
        var offsetHour = HourFromTime(absOffset).ToString("00", CultureInfo.InvariantCulture);

        var tzName = " (" + _timeSystem.DefaultTimeZone.StandardName + ")";

        return offsetSign + offsetHour + offsetMin + tzName;
    }

    public override string ToString()
    {
        return "Date.prototype";
    }
}