- fix: auth logic part 1

Nebula.Shared/Configurations/ConVarObserver.cs

@@ -0,0 +1,68 @@
+using System.ComponentModel;
+using System.Runtime.CompilerServices;
+using Nebula.Shared.Services;
+
+namespace Nebula.Shared.Configurations;
+
+public sealed class ConVarObserver<T> : IDisposable, INotifyPropertyChanged, INotifyPropertyChanging
+{
+    private readonly ConVar<T> _convar;
+    private readonly ConfigurationService _configurationService;
+    
+    private T? _value;
+    private ConfigurationService.OnConfigurationChangedDelegate<T> _delegate;
+
+    public T? Value
+    {
+        get => _value; 
+        set => _configurationService.SetConfigValue(_convar, value);
+    }
+
+    public ConVarObserver(ConVar<T> convar, ConfigurationService configurationService)
+    {
+        _convar = convar;
+        _convar.OnValueChanged += OnValueChanged;
+        _configurationService = configurationService;
+        _delegate += OnValueChanged;
+        
+        OnValueChanged(configurationService.GetConfigValue(_convar));
+    }
+
+    private void OnValueChanged(T? value)
+    {
+        OnPropertyChanging(nameof(Value));
+        
+        if(value is null && _value is null)
+            return;
+        if (_value is not null && _value.Equals(value))
+            return;
+        
+        _value = value;
+        OnPropertyChanged(nameof(Value));
+    }
+
+    public void Dispose()
+    {
+        _convar.OnValueChanged -= OnValueChanged;
+    }
+
+    public bool HasValue()
+    {
+        return Value != null;
+    }
+    
+    public static implicit operator T? (ConVarObserver<T> convar) => convar.Value;
+
+    public event PropertyChangingEventHandler? PropertyChanging;
+    public event PropertyChangedEventHandler? PropertyChanged;
+
+    private void OnPropertyChanged([CallerMemberName] string? propertyName = null)
+    {
+        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+    }
+    private void OnPropertyChanging([CallerMemberName] string? propertyName = null)
+    {
+        PropertyChanging?.Invoke(this, new PropertyChangingEventArgs(propertyName));
+    }
+    
+}