$ErrorActionPreference = "Stop"

function Test-PortFree {
  param([int]$Port)
  # Use netstat because it reliably shows listeners from Session 0 services too.
  $pattern = ":$Port\\s"
  $hit = netstat -ano -p tcp | Select-String -Pattern "LISTENING" | Select-String -Pattern $pattern
  return (-not $hit)
}

function Test-ApApi {
  param([int]$Port)
  try {
    $res = Invoke-WebRequest -UseBasicParsing -TimeoutSec 1 -Uri "http://127.0.0.1:$Port/api/health"
    if ($res.StatusCode -ne 200) { return $false }
    # Only reuse the correct backend. Old/other uvicorn apps may also return {"ok":true}.
    # Our backend1 includes service/build fields.
    return (($res.Content -match '"service"\s*:\s*"backend1"') -and ($res.Content -match '"build"\s*:\s*"backend1-'))
  } catch {
    return $false
  }
}

function Ensure-Venv {
  if (-not (Test-Path ".venv\\Scripts\\python.exe")) {
    Write-Host "Creating venv at .venv ..."
    python -m venv .venv
  }
}

$projectRoot = Split-Path -Parent $MyInvocation.MyCommand.Path
Set-Location $projectRoot

Ensure-Venv

Write-Host "Installing Python deps..."
& ".\\.venv\\Scripts\\python.exe" -m pip install -r requirements.txt | Out-Host

$candidatePorts = @(8000, 8010, 8020, 8030, 8040)
$port = $null
$startBackend = $true

# Prefer reusing an already-running AP backend if found.
foreach ($p in $candidatePorts) {
  if (Test-ApApi -Port $p) { $port = $p; $startBackend = $false; break }
}

foreach ($p in $candidatePorts) {
  if ($port) { break }
  if (Test-PortFree -Port $p) { $port = $p; break }
}
if (-not $port) {
  throw "No free port found. Tried: $($candidatePorts -join ', ')"
}

$apiBase = "http://127.0.0.1:$port"

Write-Host ""
if ($startBackend) {
  Write-Host "Starting backend on $apiBase ..."
  Start-Process powershell -WorkingDirectory $projectRoot -ArgumentList @(
    "-NoProfile",
    "-ExecutionPolicy", "Bypass",
    "-Command",
    "& '.\\.venv\\Scripts\\python.exe' -m uvicorn backend1.main:app --reload --host 127.0.0.1 --port $port"
  ) | Out-Null
} else {
  Write-Host "Backend already running on $apiBase (reusing it)"
}

if (Test-PortFree -Port 5173) {
  Write-Host "Starting frontend dev server (Vite) on http://localhost:5173 ..."
  Start-Process powershell -WorkingDirectory (Join-Path $projectRoot "frontend") -ArgumentList @(
    "-NoProfile",
    "-ExecutionPolicy", "Bypass",
    "-Command",
    "`$env:VITE_API_PROXY_TARGET='$apiBase'; npm run dev"
  ) | Out-Null
} else {
  Write-Host "Frontend dev server already running on http://localhost:5173 (not starting another)"
}

Write-Host ""
Write-Host "Open:"
Write-Host "  Frontend UI: http://localhost:5173"
Write-Host "  Backend UI:  $apiBase"
Write-Host "  API health:  $apiBase/api/health"
Write-Host ""
Write-Host "If port 8000 is in use, this script automatically uses 8010/8020/etc."