param(
  [string]$BackupRoot = "H:\Windows-Neuaufsetzen-Backup",
  [switch]$ImportWingetList
)

Set-StrictMode -Version Latest
$ErrorActionPreference = "Stop"

if (-not (Get-Command winget -ErrorAction SilentlyContinue)) {
  throw "winget is not available. Install or update App Installer from Microsoft Store first."
}

Write-Host "Installing UniGetUI..."
winget install --exact --id Devolutions.UniGetUI --source winget --accept-package-agreements --accept-source-agreements

$WingetExport = Join-Path $BackupRoot "12_Exportierte_Listen\winget-export.json"

if ($ImportWingetList) {
  if (-not (Test-Path $WingetExport)) {
    throw "WinGet export file not found: $WingetExport"
  }

  Write-Host "Importing WinGet package list..."
  Write-Host "Source: $WingetExport"
  winget import --import-file $WingetExport --accept-package-agreements --accept-source-agreements
} else {
  Write-Host ""
  Write-Host "UniGetUI installed."
  Write-Host "WinGet export is available here:"
  Write-Host "  $WingetExport"
  Write-Host ""
  Write-Host "Review the list before importing. To import later, run:"
  Write-Host "  .\postinstall-unigetui.ps1 -ImportWingetList"
}