Refactor the installation loop architecture

scripts/Windows/OS/Install.ps1

@@ -29,8 +29,10 @@ function Start-InstallationLoop {
     . "$PSScriptRoot/../Scripts/SetupConfig.ps1";
 
     while (-not (Get-IsFinished)) {
-        switch (Get-Stage) {
-            $null {
+        if (-not (Get-Stage)) {
+            Set-Stage [SetupStage]::Initialize;
+            break;
+        } elseif (Get-Stage -eq [SetupStage]::Initialize) {
             if (-not ((Get-Command "choco") -and (Get-Command "refreshenv"))) {
                 Invoke-Hook "Install-Chocolatey" -Fallback {
                     # Install chocolatey
@@ -53,10 +55,14 @@ function Start-InstallationLoop {
             if (Test-Path $env:PWSH_PATH) {
                 Remove-Item -Recurse $env:PWSH_PATH;
             }
+        } else {
+            switch (Get-Stage) {
+                $null {
                 }
                 Default {}
             }
         }
+    }
 }
 
 function Invoke-WindowsInstallation([Context] $context) {

scripts/Windows/Scripts/SetupConfig.ps1

@@ -2,6 +2,11 @@ using namespace Microsoft.Win32;
 using namespace System.Security.AccessControl;
 using namespace System.Security.Principal;
 
+enum SetupStage {
+    Initialize = "init"
+    Install = "install"
+}
+
 $null = New-Module {
     [string] $configRoot = "HKLM:\Software\PortValhalla";
     [string] $stageOption = "Stage";