param(
    [string]$SdkPath = ""
)

$ErrorActionPreference = "Stop"

$scriptDir = Split-Path -Parent $MyInvocation.MyCommand.Path
$repoRoot = Split-Path -Parent $scriptDir

if ([string]::IsNullOrWhiteSpace($SdkPath)) {
    $SdkPath = Join-Path $repoRoot "ThirdParty\Ultralight-SDK"
}
$frameworkBuild = Join-Path $repoRoot "ThirdParty\framework-F4-Conversion\build"
$linkPath = Join-Path $frameworkBuild "ultralight-1.4.0"

if (-not (Test-Path $SdkPath)) {
    Write-Error "Ultralight SDK not found at: $SdkPath"
}

foreach ($required in @("include", "lib", "bin", "resources")) {
    $candidate = Join-Path $SdkPath $required
    if (-not (Test-Path $candidate)) {
        Write-Error "Ultralight SDK is missing required folder: $candidate"
    }
}

New-Item -ItemType Directory -Path $frameworkBuild -Force | Out-Null

if (Test-Path $linkPath) {
    $item = Get-Item $linkPath -Force
    if ($item.Attributes -band [IO.FileAttributes]::ReparsePoint) {
        Write-Host "Removing existing junction: $linkPath"
        cmd /c rmdir "$linkPath" | Out-Null
    } else {
        Write-Error "Expected a junction at $linkPath but found a normal directory. Remove it manually and rerun."
    }
}

Write-Host "Linking $linkPath -> $SdkPath"
cmd /c mklink /J "$linkPath" "$SdkPath" | Out-Null
Write-Host "Ultralight SDK link ready."