$ErrorActionPreference = 'Stop'
$root = Split-Path -Parent $PSScriptRoot
$hta = Join-Path $root 'MassMailer.hta'
$mshta = Join-Path $env:SystemRoot 'SysWOW64\mshta.exe'
$existing = @(Get-CimInstance Win32_Process -Filter "Name='mshta.exe'" |
    Where-Object { $_.CommandLine -like '*MassMailer.hta*' })
if ($existing.Count) { throw 'Close the existing MassMailer HTA before this startup smoke test' }
$started = $null
try {
    $started = Start-Process -FilePath $mshta -ArgumentList ('"' + $hta + '"') -PassThru -WindowStyle Hidden
    $active = @()
    $session = $null
    for ($wait = 0; $wait -lt 25; $wait++) {
        Start-Sleep -Seconds 1
        $active = @(Get-CimInstance Win32_Process -Filter "Name='mshta.exe'" |
            Where-Object { $_.CommandLine -like '*MassMailer.hta*' })
        if ($active.Count -eq 1) {
            $session = Join-Path $root ('temp\session-' + $active[0].ProcessId + '.txt')
            if (Test-Path -LiteralPath $session -PathType Leaf) { break }
        }
    }
    if ($active.Count -ne 1) { throw 'Expected one running MassMailer HTA process' }
    if (-not (Test-Path -LiteralPath $session -PathType Leaf)) {
        throw 'HTA did not create an active dispatcher session heartbeat'
    }
    if ((Get-Item -LiteralPath $session).LastWriteTimeUtc -lt [DateTime]::UtcNow.AddSeconds(-20)) {
        throw 'HTA dispatcher heartbeat is stale'
    }
    $powerShellX86 = Join-Path $env:SystemRoot 'SysWOW64\WindowsPowerShell\v1.0\powershell.exe'
    $token = [System.IO.File]::ReadAllText($session).Trim()
    & $powerShellX86 -NoProfile -ExecutionPolicy Bypass -File (Join-Path $PSScriptRoot 'test-session-guard.ps1') -SessionPid $active[0].ProcessId -SessionToken $token
    if ($LASTEXITCODE -ne 0) { throw 'Open-window process guard rejected the active HTA' }
    Write-Output 'Hidden HTA startup and open-window dispatcher session passed'
}
finally {
    $active = @(Get-CimInstance Win32_Process -Filter "Name='mshta.exe'" |
        Where-Object { $_.CommandLine -like '*MassMailer.hta*' })
    foreach ($process in $active) {
        if ($process.ProcessId -notin @($existing | ForEach-Object ProcessId)) {
            Stop-Process -Id $process.ProcessId -Force -ErrorAction SilentlyContinue
            $session = Join-Path $root ('temp\session-' + $process.ProcessId + '.txt')
            $full = [System.IO.Path]::GetFullPath($session)
            $tempRoot = [System.IO.Path]::GetFullPath((Join-Path $root 'temp'))
            if ($full.StartsWith($tempRoot + [System.IO.Path]::DirectorySeparatorChar,
                [StringComparison]::OrdinalIgnoreCase) -and (Test-Path -LiteralPath $full)) {
                Remove-Item -LiteralPath $full -Force
            }
        }
    }
}