param(
  [string]$VenvDir = ".venv"
)

$ErrorActionPreference = "Stop"

Write-Host "Creating virtual environment in '$VenvDir'..."
python -m venv $VenvDir

$pythonExe = Join-Path $VenvDir "Scripts\python.exe"
if (-not (Test-Path $pythonExe)) {
  throw "Python executable not found in virtual environment: $pythonExe"
}

Write-Host "Upgrading pip..."
& $pythonExe -m pip install --upgrade pip

Write-Host "Installing required packages..."
& $pythonExe -m pip install pytest

Write-Host ""
Write-Host "Done."
Write-Host "Activate venv: .\$VenvDir\Scripts\Activate.ps1"
Write-Host "Run tests:    pytest -q"