# rojo-guard.ps1 -- keep Rojo alive for Tokyo Wangan Racing.
# Idempotent: starts Rojo only if it is not already listening on 34872.
# Safe to run every few minutes from Task Scheduler.

$ErrorActionPreference = "SilentlyContinue"
$repo = Join-Path $env:USERPROFILE "roblox\tokyo-wangan-racing"
$exe  = Join-Path $env:USERPROFILE ".local\bin\rojo.exe"
$port = 34872
$log  = Join-Path $env:USERPROFILE "rojo-guard.log"

function Log($m) { "$(Get-Date -f 'yyyy-MM-dd HH:mm:ss')  $m" | Add-Content $log }

# Is something already LISTENING on the port?
$listening = netstat -ano | Select-String ":$port\s.*LISTENING"

if ($listening) {
    $ownerPid = ($listening[0] -split "\s+")[-1]
    $owner    = (Get-Process -Id $ownerPid).ProcessName
    if ($owner -eq "rojo") { exit 0 }          # healthy, nothing to do
    Log "PORT HIJACKED by '$owner' (pid $ownerPid) -- not starting. Kill it first."
    exit 1                                      # sshd tunnel or similar: do NOT mask it
}

# Dependencies must exist or rojo exits instantly.
if (-not (Test-Path (Join-Path $repo "ServerPackages"))) {
    Log "ServerPackages MISSING -- rojo would exit on startup. Run 'wally install'."
    exit 1
}

# Launch DETACHED via Task Scheduler.
# Do NOT use Start-Process here: if this script is ever invoked over SSH,
# Windows OpenSSH kills the whole process tree on session exit and rojo dies
# seconds later. schtasks hands ownership to the scheduler, which survives.
schtasks /Run /TN "RojoTWR" | Out-Null
Start-Sleep -Seconds 4

if (Get-Process rojo -EA SilentlyContinue) { Log "started rojo on $port" }
else { Log "FAILED to start rojo" }