# Launches a headless browser with the CDP port open and ties its life to this SSH session:
# stdin closing (the caller went away, however violently) kills the whole process tree. Without
# that leash the browser survives a dropped connection - measured: 8 orphaned chrome.exe.
param([int]$Port = 9333, [string]$Size = "1280,800")
$ErrorActionPreference = 'Stop'

$candidates = @(
  "C:\Program Files\Google\Chrome\Application\chrome.exe",
  "C:\Program Files (x86)\Google\Chrome\Application\chrome.exe",
  "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe"
)
$exe = $candidates | Where-Object { Test-Path $_ } | Select-Object -First 1
if (-not $exe) { [Console]::Error.WriteLine("no chrome or edge found"); exit 2 }

$udd = Join-Path $env:TEMP "gm-e2e-$Port"
Remove-Item -Recurse -Force $udd -ErrorAction SilentlyContinue

# No --disable-gpu here: forcing software WebGL on a desktop with a real card rasterises every
# frame on the CPU and made the host unusable. Let the machine use the card it has.
$flags = @(
  '--headless', '--ignore-gpu-blocklist', '--renderer-process-limit=1',
  "--remote-debugging-port=$Port", "--user-data-dir=`"$udd`"", "--window-size=$Size",
  '--hide-scrollbars', '--disable-background-networking', '--disable-sync',
  '--disable-extensions', '--no-first-run', '--mute-audio', '--no-default-browser-check',
  'about:blank'
)

$proc = Start-Process -FilePath $exe -ArgumentList $flags -PassThru -NoNewWindow
[Console]::Error.WriteLine("gm-browser: $exe pid=$($proc.Id) port=$Port")

# Either the browser dies on its own, or our caller does. Both must end this script.
while (-not $proc.HasExited) {
  if ([Console]::In.ReadLine() -eq $null) { break }
}

if ($proc.HasExited) {
  [Console]::Error.WriteLine("gm-browser: browser exited on its own with code $($proc.ExitCode)")
} else {
  # taskkill and tasklist filters are denied to this account; Stop-Process is not. Killing by name
  # is safe here because the account exists only to run these tests.
  Get-Process chrome, msedge -ErrorAction SilentlyContinue | Stop-Process -Force -ErrorAction SilentlyContinue
  [Console]::Error.WriteLine("gm-browser: stdin closed, killed the browser")
}