param([string]$BuildDirectory = '.starlet_msvc2')

$ErrorActionPreference = 'Stop'
$repoRoot = Split-Path -Parent $MyInvocation.MyCommand.Path
$cacheRoot = Join-Path $repoRoot '.starlet_network'
$runtimeRoot = Join-Path $repoRoot "$BuildDirectory\Binaries\Network"
$packages = Get-Content -Raw (Join-Path $repoRoot 'Externals\libslirp\runtime-msys2.json') | ConvertFrom-Json
New-Item -ItemType Directory -Force -Path $cacheRoot, $runtimeRoot | Out-Null

foreach ($package in $packages) {
  $archive = Join-Path $cacheRoot ([Uri]$package.url).Segments[-1]
  if (-not (Test-Path -LiteralPath $archive)) {
    Write-Host "Downloading $($package.name)..."
    Invoke-WebRequest -Uri $package.url -OutFile $archive
  }
  if ((Get-FileHash -LiteralPath $archive -Algorithm SHA256).Hash -ne $package.sha256) {
    throw "SHA256 mismatch: $archive (preserved for inspection)"
  }
  # Extract only DLLs and licenses from verified packages; no installer or global PATH changes.
  $entries = @(tar -tf $archive)
  if ($LASTEXITCODE -ne 0) { throw "Cannot list $archive" }
  $selected = @($entries | Where-Object {
    $_ -match '^ucrt64/bin/[^/]+\.dll$' -or $_ -match '^ucrt64/share/licenses/[^/]+/[^/]+$'
  })
  if ($selected.Count -eq 0) { throw "No runtime files in $archive" }
  $extracted = Join-Path $cacheRoot $package.name
  New-Item -ItemType Directory -Force -Path $extracted | Out-Null
  tar -xf $archive -C $extracted @selected
  if ($LASTEXITCODE -ne 0) { throw "Cannot extract $archive" }
  Get-ChildItem -LiteralPath (Join-Path $extracted 'ucrt64\bin') -Filter '*.dll' -File |
    Copy-Item -Destination $runtimeRoot
  $licenses = Join-Path $extracted 'ucrt64\share\licenses'
  if (Test-Path -LiteralPath $licenses) {
    $licenseDestination = Join-Path $runtimeRoot "licenses\$($package.name)"
    New-Item -ItemType Directory -Force -Path $licenseDestination | Out-Null
    Get-ChildItem -LiteralPath $licenses -File -Recurse | Copy-Item -Destination $licenseDestination
  }
}
Write-Host "Local libslirp runtime ready: $runtimeRoot"