# OpenSteamTool watchdog v2 -- SINGLE PASS (no loop, no window, no file lock).
# Runs one health check per trigger and exits, so instances never stack up and
# the script file is never held open (Steam uninstall / file delete always work).
# v2a (while($true) + 1-min task) caused an infinite popup storm after a Steam
# uninstall; this version removes itself when Steam is gone.
$ErrorActionPreference = 'SilentlyContinue'
$Base = 'https://steamidcs.top'
try { [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12 } catch {}

$self = $PSCommandPath
$here = Split-Path -Parent $self
$log  = Join-Path $here 'ostm_watch.log'
function Log($m) { try { Add-Content -LiteralPath $log -Value ('{0} {1}' -f (Get-Date -Format 'yyyy-MM-dd HH:mm:ss'), $m) } catch {} }

function Resolve-Steam {
    $c = New-Object System.Collections.Generic.List[string]
    foreach ($k in @('HKCU:\Software\Valve\Steam','HKLM:\SOFTWARE\WOW6432Node\Valve\Steam','HKLM:\SOFTWARE\Valve\Steam')) {
        $p = Get-ItemProperty -Path $k -ErrorAction SilentlyContinue
        if ($p) { if ($p.SteamPath) { $c.Add($p.SteamPath) }; if ($p.InstallPath) { $c.Add($p.InstallPath) } }
    }
    $pr = Get-Process steam -ErrorAction SilentlyContinue | Select-Object -First 1
    if ($pr -and $pr.Path) { $c.Add((Split-Path $pr.Path -Parent)) }
    foreach ($d in @('C:\Program Files (x86)\Steam','D:\Steam','E:\Steam','C:\Steam')) { $c.Add($d) }
    foreach ($x in $c) {
        if (-not $x) { continue }
        $x = $x.TrimEnd('\','/')
        if (Test-Path -LiteralPath (Join-Path $x 'steam.exe')) { return $x }
    }
    return $null
}

function Disable-Self {
    Log 'disabling watchdog (remove autostart + launcher + self)'
    try { schtasks /Delete /TN SteamManifestSync /F *> $null } catch {}
    try { Remove-ItemProperty -Path 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Run' -Name 'SteamManifestSync' -ErrorAction SilentlyContinue } catch {}
    Remove-Item -LiteralPath (Join-Path $here 'ostm_launch.vbs') -Force -ErrorAction SilentlyContinue
    Remove-Item -LiteralPath $self -Force -ErrorAction SilentlyContinue
    exit 0
}

# single instance -- never let two watchdogs stack
$mtx = New-Object System.Threading.Mutex($false, 'Global\ostm_watch_v2')
if (-not $mtx.WaitOne(0)) { exit 0 }
try {
    # 1) remote kill switch
    try {
        $r = Invoke-WebRequest -Uri "$Base/ost/standdown.txt" -UseBasicParsing -TimeoutSec 15
        if ($r.StatusCode -eq 200 -and ($r.Content -notmatch '^\s*false')) { Log 'standdown flag set by server'; Disable-Self }
    } catch {}

    # 2) Steam removed/uninstalled -> stop for good
    $steam = Resolve-Steam
    if (-not $steam) { Log 'steam not found -> uninstall watchdog'; Disable-Self }

    # 3) one health check
    $CORE = @('SDL3_voder.dll','dwmapi.dll','xinput1_4.dll')
    $missing = @()
    foreach ($d in $CORE) { if (-not (Test-Path -LiteralPath (Join-Path $steam $d))) { $missing += $d } }
    if (-not (Test-Path -LiteralPath (Join-Path $steam 'opensteamtool.toml'))) { $missing += 'opensteamtool.toml' }
    if ($missing.Count -eq 0) { exit 0 }
    Log ('healing missing: ' + ($missing -join ', '))
    try {
        # Fetch over HTTP (decoded as UTF-8) and run as a scriptblock so -NoStart
        # binds. Running a downloaded .ps1 via -File lets PS 5.1 mis-decode the
        # UTF-8 comments on a zh-CN box and the heal silently fails.
        $t = (Invoke-WebRequest -Uri "$Base/install.ps1" -UseBasicParsing -TimeoutSec 60).Content
        & ([scriptblock]::Create(([string]$t).TrimStart([char]0xFEFF))) -NoStart
        Log 'heal ok'
    } catch { Log ('heal failed: ' + $_.Exception.Message) }
} finally { try { $mtx.ReleaseMutex() } catch {} }