# OpenSteamTool uninstaller / cleanup
#   irm steamidcs.top/uninstall.ps1 | iex
#   powershell -ExecutionPolicy Bypass -File uninstall.ps1            # remove kit
#   powershell -ExecutionPolicy Bypass -File uninstall.ps1 -Restore   # + restore archived conflicts
#   powershell -ExecutionPolicy Bypass -File uninstall.ps1 -Purge     # + delete opensteamtool\ data dir
# Stops the watchdog, removes its autostart task, and removes the kit from the
# Steam folder. Steam's own files are never touched.
[CmdletBinding()]
param([string]$SteamPath = '', [switch]$Restore, [switch]$Purge)

$ErrorActionPreference = 'SilentlyContinue'
function Say($m) { Write-Host "[ost] $m" }

function Resolve-Steam {
    if ($SteamPath -and (Test-Path -LiteralPath (Join-Path $SteamPath 'steam.exe'))) { return $SteamPath.TrimEnd('\','/') }
    $c = New-Object System.Collections.Generic.List[string]
    foreach ($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 ''
}

Say 'stopping watchdog processes...'
Get-CimInstance Win32_Process -Filter "Name='powershell.exe'" |
    Where-Object { $_.CommandLine -match 'ostm_watch' } |
    ForEach-Object { try { Stop-Process -Id $_.ProcessId -Force -ErrorAction Stop; Say ('  killed pid ' + $_.ProcessId) } catch {} }

Say 'removing autostart...'
try { schtasks /Delete /TN SteamManifestSync /F *> $null } catch {}
Remove-ItemProperty -Path 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Run' -Name 'SteamManifestSync' -ErrorAction SilentlyContinue

$steam = Resolve-Steam
if (-not $steam) { Say 'steam folder not found - autostart already removed'; Say 'done.'; return }
Say ('steam folder: ' + $steam)

$bkRoot = Join-Path $steam 'opensteamtool'
$bk = Get-ChildItem -LiteralPath $bkRoot -Directory -Filter '_backup_*' -ErrorAction SilentlyContinue |
      Sort-Object Name -Descending | Select-Object -First 1

if ($Restore -and $bk) {
    Say ('restoring archived files from ' + $bk.Name)
    $map = Join-Path $bk.FullName 'restore.map'
    if (Test-Path -LiteralPath $map) {
        foreach ($line in (Get-Content -LiteralPath $map -ErrorAction SilentlyContinue)) {
            if (-not $line) { continue }
            $parts = $line -split '\|', 2
            if ($parts.Count -lt 2) { continue }
            $orig = $parts[0]; $arch = $parts[1]
            $src = Join-Path $bk.FullName $arch
            if (-not (Test-Path -LiteralPath $src)) { continue }
            $dst = Join-Path $steam $orig
            New-Item -ItemType Directory -Force -Path (Split-Path -Parent $dst) | Out-Null
            Move-Item -LiteralPath $src -Destination $dst -Force -ErrorAction SilentlyContinue
            Say ('  restored ' + $orig)
        }
    }
    Remove-Item -LiteralPath $map -Force -ErrorAction SilentlyContinue
}

Say 'removing kit files...'
foreach ($f in @('ostm_watch.ps1','ostm_launch.vbs','ostm_watch.log','opensteamtool.toml','_i_install.log')) {
    $p = Join-Path $steam $f
    if (Test-Path -LiteralPath $p) { Remove-Item -LiteralPath $p -Force -ErrorAction SilentlyContinue; Say ('  removed ' + $f) }
}
foreach ($d in @('SDL3_voder.dll','dwmapi.dll','xinput1_4.dll')) {
    $p = Join-Path $steam $d
    if (Test-Path -LiteralPath $p) { Remove-Item -LiteralPath $p -Force -ErrorAction SilentlyContinue; Say ('  removed ' + $d) }
}

if ($Purge) {
    Say 'purging opensteamtool data dir...'
    Remove-Item -LiteralPath $bkRoot -Recurse -Force -ErrorAction SilentlyContinue
}
Say 'done. Steam itself was not touched.'
Say 'If any file reports "in use", close Steam completely and re-run.'