feat: wip on remove config command

src/AltGen.Console/Config/RemoveConfigCommand.cs

@@ -1,16 +1,40 @@
 namespace AltGen.Console.Config;
 
-sealed class RemoveConfigCommand() : AsyncCommand<RemoveConfigCommand.Settings>
+sealed class RemoveConfigCommand(
+  IFileSystem fileSystem,
+  IAnsiConsole console
+) : AsyncCommand<RemoveConfigCommand.Settings>
 {
-  public class Settings : CommandSettings
+  readonly IFileSystem _fileSystem = fileSystem;
+  readonly IAnsiConsole _console = console;
+
+  public class Settings(IFileSystem fileSystem) : CommandSettings
   {
+    readonly IFileSystem _fileSystem = fileSystem;
+
     [CommandArgument(1, "<provider>")]
     [Description("The provider to remove.")]
     public string Provider { get; init; } = string.Empty;
+
+    public string SettingsPath => _fileSystem.Path.Combine(AppContext.BaseDirectory, "appsettings.json");
   }
 
   public override async Task<int> ExecuteAsync(CommandContext context, Settings settings)
   {
+    var exists = _fileSystem.Path.Exists(settings.SettingsPath);
+
+    if (exists is false)
+    {
+      _console.MarkupLine("[bold]No existing settings found.[/]");
+      return 1;
+    }
+
+    var settingsJson = await _fileSystem.File.ReadAllTextAsync(settings.SettingsPath);
+    var appSettings = JsonSerializer.Deserialize<AppSettings>(settingsJson) ?? throw new ConfigException("Failed to deserialize app settings.");
+    var updatedAppSettings = appSettings.RemoveProvider(settings);
+    var updatedJson = JsonSerializer.Serialize(updatedAppSettings);
+    await _fileSystem.File.WriteAllTextAsync(settings.SettingsPath, updatedJson);
+    _console.MarkupLine($"[bold]{settings.Provider}[/] has been removed.");
     return 0;
   }
 }