$ErrorActionPreference = 'Stop'
$project = $PSScriptRoot
$venv = Join-Path $project '.venv_gui'
$py = Join-Path $venv 'Scripts\python.exe'
Push-Location $project
try {
    if (-not (Test-Path -LiteralPath $py)) {
        & py -3 -m venv $venv
        if ($LASTEXITCODE -ne 0) { throw "venv failed: $LASTEXITCODE" }
    }
    & $py -m pip install -q --upgrade pip pyinstaller pyserial
    if ($LASTEXITCODE -ne 0) { throw "pip failed: $LASTEXITCODE" }
    & $py -m PyInstaller --noconfirm --clean --workpath gui_build --distpath dist nand_put_gui.spec
    if ($LASTEXITCODE -ne 0) { throw "PyInstaller failed: $LASTEXITCODE" }
    $exe = Join-Path $project 'dist\NAND_Xfer.exe'
    if (-not (Test-Path -LiteralPath $exe)) { throw "Missing $exe" }
    Write-Host "GUI exe: $exe"
} finally { Pop-Location }