$ErrorActionPreference = "Stop"

param(
  [int]$Port = 5173
)

function Get-ListeningProcess {
  param([int]$TargetPort)

  $listener = Get-NetTCPConnection -LocalPort $TargetPort -State Listen -ErrorAction SilentlyContinue |
    Select-Object -First 1

  if (-not $listener) {
    return $null
  }

  $process = Get-CimInstance Win32_Process -Filter "ProcessId = $($listener.OwningProcess)" -ErrorAction SilentlyContinue
  if (-not $process) {
    return $null
  }

  return [PSCustomObject]@{
    Id = $listener.OwningProcess
    CommandLine = [string]($process.CommandLine ?? "")
  }
}

$existing = Get-ListeningProcess -TargetPort $Port
if ($existing) {
  if ($existing.CommandLine -notmatch "vite(?:\.js)?") {
    throw "Port $Port is already in use by a non-Vite process: $($existing.CommandLine)"
  }

  Stop-Process -Id $existing.Id -Force
  Start-Sleep -Seconds 1
}

$npm = if (Get-Command npm.cmd -ErrorAction SilentlyContinue) {
  "npm.cmd"
} else {
  "npm"
}

& $npm run dev -- --host localhost --port $Port --strictPort
exit $LASTEXITCODE