FModel/FModel/Helper.cs

using System;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Windows;

namespace FModel;

public static class Helper
{
    public static string FixKey(string key)
    {
        if (string.IsNullOrEmpty(key))
            return string.Empty;

        var keySpan = key.AsSpan().Trim();
        if (keySpan.Length > sizeof(char) * (2 /* 0x */ + 32 /* FAES = 256 bit */)) // maybe strictly check for length?
            return string.Empty; // bullshit key

        Span<char> resultSpan = stackalloc char[keySpan.Length + 2 /* pad for 0x */];
        keySpan.ToUpperInvariant(resultSpan[2..]);

        if (resultSpan[2..].StartsWith("0X"))
            resultSpan = resultSpan[2..];
        else
            resultSpan[0] = '0';

        resultSpan[1] = 'x';

        return new string(resultSpan);
    }

    public static void OpenWindow<T>(string windowName, Action action) where T : Window
    {
        if (!IsWindowOpen<T>(windowName))
        {
            action();
        }
        else
        {
            var w = GetOpenedWindow<T>(windowName);
            if (windowName == "Search View") w.WindowState = WindowState.Normal;
            w.Focus();
        }
    }

    public static T GetWindow<T>(string windowName, Action action) where T : Window
    {
        if (!IsWindowOpen<T>(windowName))
        {
            action();
        }

        var ret = (T) GetOpenedWindow<T>(windowName);
        ret.Focus();
        ret.Activate();
        return ret;
    }

    public static void CloseWindow<T>(string windowName) where T : Window
    {
        if (!IsWindowOpen<T>(windowName)) return;
        GetOpenedWindow<T>(windowName).Close();
    }

    private static bool IsWindowOpen<T>(string name = "") where T : Window
    {
        return string.IsNullOrEmpty(name)
            ? Application.Current.Windows.OfType<T>().Any()
            : Application.Current.Windows.OfType<T>().Any(w => w.Title.Equals(name));
    }

    private static Window GetOpenedWindow<T>(string name) where T : Window
    {
        return Application.Current.Windows.OfType<T>().FirstOrDefault(w => w.Title.Equals(name));
    }

    public static bool IsNaN(double value)
    {
        var ulongValue = Unsafe.As<double, ulong>(ref value);
        var exp = ulongValue & 0xfff0000000000000;
        var man = ulongValue & 0x000fffffffffffff;
        return exp is 0x7ff0000000000000 or 0xfff0000000000000 && man != 0;
    }

    public static bool AreVirtuallyEqual(double d1, double d2)
    {
        if (double.IsPositiveInfinity(d1))
            return double.IsPositiveInfinity(d2);

        if (double.IsNegativeInfinity(d1))
            return double.IsNegativeInfinity(d2);

        if (IsNaN(d1))
            return IsNaN(d2);

        var n = d1 - d2;
        var d = (Math.Abs(d1) + Math.Abs(d2) + 10) * 1.0e-15;
        return -d < n && d > n;
    }

    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static float DegreesToRadians(float degrees)
    {
        const float ratio = MathF.PI / 180f;
        return ratio * degrees;
    }

    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static float RadiansToDegrees(float radians)
    {
        const float ratio = 180f / MathF.PI;
        return radians * ratio;
    }
}