#Requires -Version 5.1
# Provision winget (the App Installer) when absent. Windows IoT Enterprise LTSC
# ships WITHOUT the inbox Microsoft.DesktopAppInstaller package, so re-registering
# it is not enough - we download and install it (plus dependencies) online at apply
# time. Best-effort and idempotent: exit 0 if winget ends up available, else 1.
$ErrorActionPreference = 'SilentlyContinue'

function Test-Winget {
    return [bool](Get-Command winget -ErrorAction SilentlyContinue)
}

# Fast path 1: winget already on PATH.
if (Test-Winget) { exit 0 }

# Fast path 2: an inbox App Installer package is present - just re-register it.
Get-AppxPackage -AllUsers Microsoft.DesktopAppInstaller |
    ForEach-Object { Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml" }
if (Test-Winget) { exit 0 }

# Slow path: download + install the App Installer and its dependencies online.
$temp        = $env:TEMP
$bundlePath  = Join-Path $temp 'Microsoft.DesktopAppInstaller.msixbundle'
$vclibsPath  = Join-Path $temp 'Microsoft.VCLibs.x64.14.00.Desktop.appx'
$uixamlNupkg = Join-Path $temp 'microsoft.ui.xaml.2.8.6.nupkg'
$uixamlExtract = Join-Path $temp 'uixaml.2.8.6'
$uixamlAppx  = Join-Path $uixamlExtract 'tools\AppX\x64\Release\Microsoft.UI.Xaml.2.8.appx'

$bundleUrl = 'https://aka.ms/getwinget'
$vclibsUrl = 'https://aka.ms/Microsoft.VCLibs.x64.14.00.Desktop.appx'
$uixamlUrl = 'https://globalcdn.nuget.org/packages/microsoft.ui.xaml.2.8.6.nupkg'

function Get-File {
    param([string]$Url, [string]$Destination)
    try {
        Invoke-WebRequest -Uri $Url -OutFile $Destination -UseBasicParsing
        return (Test-Path $Destination)
    } catch {
        return $false
    }
}

# Download the App Installer bundle (required).
if (-not (Get-File -Url $bundleUrl -Destination $bundlePath)) { exit 1 }

# Download the VCLibs desktop dependency (required).
if (-not (Get-File -Url $vclibsUrl -Destination $vclibsPath)) { exit 1 }

# Download the UI.Xaml 2.8 nuget package (a .zip) and extract the appx from it.
if (-not (Get-File -Url $uixamlUrl -Destination $uixamlNupkg)) { exit 1 }
try {
    if (Test-Path $uixamlExtract) { Remove-Item -Path $uixamlExtract -Recurse -Force }
    Add-Type -AssemblyName System.IO.Compression.FileSystem
    [System.IO.Compression.ZipFile]::ExtractToDirectory($uixamlNupkg, $uixamlExtract)
} catch {
    exit 1
}
if (-not (Test-Path $uixamlAppx)) { exit 1 }

# Install order: VCLibs dependency, then UI.Xaml dependency, then the bundle with
# both supplied as DependencyPath. Per-user Add-AppxPackage (toolbox runs as the
# real admin user at first logon).
Add-AppxPackage -Path $vclibsPath
Add-AppxPackage -Path $uixamlAppx
Add-AppxPackage -Path $bundlePath -DependencyPath $vclibsPath, $uixamlAppx

# Final re-check.
if (Test-Winget) { exit 0 }
exit 1