param(
  [switch]$GenLock
)

$ErrorActionPreference = 'Stop'

# Project root
$root = (Resolve-Path (Join-Path $PSScriptRoot '..')).Path
Set-Location $root

# Find Python
$usePyLauncher = $false
if (Get-Command py -ErrorAction SilentlyContinue) {
  $usePyLauncher = $true
} elseif (-not (Get-Command python -ErrorAction SilentlyContinue)) {
  Write-Host "[ERROR] Python not found. Please install Python 3.12.10 and rerun." -ForegroundColor Red
  exit 1
}

# Create venv if missing
if (-not (Test-Path '.venv')) {
  if ($usePyLauncher) {
    & py -3.12 -m venv .venv
  } else {
    & python -m venv .venv
  }
}

# Paths to venv python/pip
$venvPython = Join-Path $root '.venv\Scripts\python.exe'
$venvPip    = Join-Path $root '.venv\Scripts\pip.exe'

# Upgrade tooling
& $venvPython -m pip install --upgrade pip wheel setuptools

# Determine scan root
$scanRoot = '.'
if (Test-Path 'src') { $scanRoot = 'src' }

# Run import scanner if available
$scanScript = Join-Path $root 'tools\scan_imports.py'
if (Test-Path $scanScript) {
  Write-Host "[INFO] Scanning imports in $scanRoot ..."
  & $venvPython $scanScript --src $scanRoot --out 'requirements.in' --update
} else {
  Write-Host "[INFO] tools\scan_imports.py not found. Skipping import scan."
}

# Install dependencies
if (Test-Path 'pyproject.toml') {
  Write-Host "[INFO] Installing from pyproject.toml"
  & $venvPip install -e .
}

if (Test-Path 'requirements.in') {
  Write-Host "[INFO] Installing from requirements.in"
  & $venvPip install -r 'requirements.in'
}

# Generate lock file
if ($GenLock -or -not (Test-Path 'requirements.lock.txt')) {
  Write-Host "[INFO] Writing requirements.lock.txt"
  & $venvPip freeze | Out-File -Encoding ascii 'requirements.lock.txt'
}

Write-Host "[OK] Setup finished." -ForegroundColor Green