param(
  [switch]$Force
)

$ErrorActionPreference = "Stop"

$Root = Resolve-Path -LiteralPath (Join-Path $PSScriptRoot "..")
$OfflineDeps = Join-Path $Root "offline-deps"
$ServiceDir = Join-Path $Root "service"
$Installer = Join-Path $OfflineDeps "installers\python-3.13.12-amd64.exe"
$PythonRuntime = Join-Path $OfflineDeps "python-runtime"
$RuntimePython = Join-Path $PythonRuntime "python.exe"
$Venv = Join-Path $Root "venv"
$VenvPython = Join-Path $Venv "Scripts\python.exe"
$Wheels = Join-Path $OfflineDeps "wheels"
$ServiceEnv = Join-Path $ServiceDir ".env.local"

if (!(Test-Path -LiteralPath $ServiceDir)) {
  throw "Could not find service directory. Run this script from the AS_Test project layout."
}

if (!(Test-Path -LiteralPath $Installer)) {
  throw "Missing Python installer: $Installer"
}

if (!(Test-Path -LiteralPath $Wheels)) {
  throw "Missing wheels directory: $Wheels"
}

if ($Force -and (Test-Path -LiteralPath $Venv)) {
  Remove-Item -LiteralPath $Venv -Recurse -Force
}

if (!(Test-Path -LiteralPath $RuntimePython)) {
  New-Item -ItemType Directory -Force -Path $PythonRuntime | Out-Null
  $args = @(
    "/quiet",
    "InstallAllUsers=0",
    "TargetDir=$PythonRuntime",
    "Include_launcher=0",
    "PrependPath=0",
    "Include_test=0",
    "Include_doc=0",
    "Include_tcltk=0",
    "Include_pip=1"
  )

  $process = Start-Process -FilePath $Installer -ArgumentList $args -Wait -PassThru -WindowStyle Hidden
  if ($process.ExitCode -ne 0) {
    throw "Python installer failed with exit code $($process.ExitCode)"
  }
}

& $RuntimePython --version

if (!(Test-Path -LiteralPath $VenvPython)) {
  & $RuntimePython -m venv $Venv
}

& $VenvPython -m pip install --no-index --find-links $Wheels jsbsim==1.3.0
& $VenvPython -c "import jsbsim, numpy; print('jsbsim', jsbsim.__version__); print('numpy', numpy.__version__)"

@"
SIM_BACKEND=jsbsim
JSBSIM_PYTHON=$VenvPython
"@ | Set-Content -LiteralPath $ServiceEnv -Encoding UTF8

Write-Host ""
Write-Host "JSBSim offline environment is ready."
Write-Host "Service env written to: $ServiceEnv"
Write-Host ""
Write-Host "Start service with:"
Write-Host "  cd $Root\service"
Write-Host "  npm.cmd run start"