# NexusOS launcher for Windows (native, no Vite).
#
# Single-process app: the backend on :8000 serves the built web UI itself, so
# this starts only the memory service + backend, opening a native app window
# (bin\nexus_window.py, pywebview/WebView2) immediately alongside them with its
# own live-updating loading screen. The AI (Ollama) does NOT auto-start - turn
# it on from the UI's Start AI button. Closing the app window stops the
# services.
#
#   Right-click -> Run with PowerShell   (or:  powershell -File launch_nexus.ps1)

$ErrorActionPreference = "Stop"
$ProgressPreference = "SilentlyContinue"  # Invoke-WebRequest's progress bar adds real latency for no benefit here
$Root = $PSScriptRoot
$Py = Join-Path $Root "Promethean\Scripts\python.exe"
if (-not (Test-Path $Py)) { $Py = "python" }  # fall back to PATH
$PyW = Join-Path $Root "Promethean\Scripts\pythonw.exe"
if (-not (Test-Path $PyW)) { $PyW = "pythonw" }  # fall back to PATH

$Runtime = Join-Path $Root "runtime"
$Logs = Join-Path $Runtime "logs"
New-Item -ItemType Directory -Force -Path $Runtime, $Logs | Out-Null

function Start-Svc($log, $argList) {
    return Start-Process -FilePath $Py -ArgumentList $argList `
        -WorkingDirectory $Root -WindowStyle Hidden -PassThru `
        -RedirectStandardOutput $log -RedirectStandardError "$log.err"
}

function Test-ServiceUp($url) {
    try {
        $r = Invoke-WebRequest -Uri $url -TimeoutSec 2 -UseBasicParsing
        return $r.StatusCode -eq 200
    } catch { return $false }
}

Write-Host "Starting NexusOS..." -ForegroundColor Cyan
# Only reuse a port if something actually answers there. A bare port-listen
# check isn't enough: a wedged process left over from a prior crashed launch
# can be squatting the port without ever responding, and treating that as
# "already running" skips starting a real service - the window then sits on
# its loading screen for the full 40s with no way to tell why.
$memory = $null
if (-not (Test-ServiceUp "http://127.0.0.1:8001/")) {
    $memory = Start-Svc (Join-Path $Runtime "memory.log")  @("-m","uvicorn","synapse.memory.service:app","--host","127.0.0.1","--port","8001")
}
$backend = $null
if (-not (Test-ServiceUp "http://127.0.0.1:8000/status")) {
    $backend = Start-Svc (Join-Path $Runtime "backend.log") @("-m","uvicorn","synapse.main:sio_app","--host","127.0.0.1","--port","8000")
}

# Open the UI in a native window (pywebview / WebView2) - no browser, no Edge
# profile cold-start - IMMEDIATELY, in parallel with memory/backend still
# coming up. bin\nexus_window.py opens on its own loading page and polls
# :8001 then :8000 itself, updating that page's status line live as each
# comes up, so the window is on screen from the first instant instead of
# this script blocking silently (in a hidden window) for up to 30s first and
# only then showing anything. It blocks until the window is closed and falls
# back to the default browser if WebView2 is unavailable.
$WindowScript = Join-Path $Root "bin\nexus_window.py"
$app = Start-Process -FilePath $PyW -ArgumentList "`"$WindowScript`"" `
    -WorkingDirectory $Root -PassThru

Write-Host "NexusOS window opened; services are starting at http://localhost:8000  (AI is off - start it in the UI)" -ForegroundColor Green
# Block until the app window (or a service we started) exits, so this process
# stays alive to hold and later stop the services. No blind Read-Host: the
# shortcut runs hidden, where a prompt no one can answer would hang forever.
if ($app) { $app.WaitForExit() }
elseif ($backend) { $backend.WaitForExit() }
elseif ($memory) { $memory.WaitForExit() }

# Shut the services down.
Write-Host "Stopping NexusOS..." -ForegroundColor Cyan
foreach ($p in @($backend, $memory)) {
    if ($p -and -not $p.HasExited) { Stop-Process -Id $p.Id -Force -ErrorAction SilentlyContinue }
}
