<#
  One-off migration: the app no longer has a built-in "Menu patch" hook. Your menu patch becomes an ordinary command hook.

    - writes "<library>\hooks\menupatch\apply.ps1": copies the MenuPatch folder (and PatchMenus.bat) from this folder into the game
      folder, then runs MenuPatch\patch.ps1 there, exiting with its exit code
    - config.json: the hook with id "menupatch" gets Command = that apply.ps1 and loses its "Kind"

  Your existing master folder (<library>\hooks\menupatch\MenuPatch and PatchMenus.bat) is not touched.
  Run it OUTSIDE Claude's sandbox (a normal terminal), otherwise it edits a private copy of %APPDATA%.
  Dry run by default; -Apply writes. Close CVRManager first with -Apply. config.json is backed up next to itself.
#>
[CmdletBinding()]
param(
    [string]$ConfigDir = (Join-Path $env:APPDATA 'CVRManager'),
    [switch]$Apply
)
$ErrorActionPreference = 'Stop'

$configPath = Join-Path $ConfigDir 'config.json'
if (-not (Test-Path $configPath)) { throw "No config at $configPath" }
if ($Apply -and (Get-Process CVRManager -ErrorAction SilentlyContinue)) { throw 'Close CVRManager first; it would overwrite the change.' }
$cfg = Get-Content $configPath -Raw | ConvertFrom-Json
$lib = if ($cfg.LibraryRoot) { $cfg.LibraryRoot } else { Join-Path $env:LOCALAPPDATA 'CVRManager' }
$master = Join-Path $lib 'hooks\menupatch'
$apply1 = Join-Path $master 'apply.ps1'

$hook = @($cfg.Hooks) | Where-Object { $_.Id -eq 'menupatch' } | Select-Object -First 1
if (-not $hook) { 'No hook with id "menupatch" in the config; nothing to migrate.'; return }
"Hook '$($hook.Name)': Kind=$($hook.Kind), Command='$($hook.Command)'"
"Master folder: $master (MenuPatch present: $(Test-Path (Join-Path $master 'MenuPatch\patch.ps1')))"
"apply.ps1 will be written to: $apply1"

$script = @'
$ErrorActionPreference = 'Stop'
$game = $env:CVR_GAME_DIR
if (-not $game) { throw 'CVR_GAME_DIR is not set; run this from CVRManager.' }
$src = Join-Path $PSScriptRoot 'MenuPatch'
if (-not (Test-Path (Join-Path $src 'patch.ps1'))) { throw "No MenuPatch\patch.ps1 in $PSScriptRoot" }
robocopy $src (Join-Path $game 'MenuPatch') /E /XD backup 'reference-*' /NFL /NDL /NJH /NJS /NP | Out-Null
if ($LASTEXITCODE -ge 8) { throw "robocopy failed ($LASTEXITCODE)" }
$bat = Join-Path $PSScriptRoot 'PatchMenus.bat'
if (Test-Path $bat) { Copy-Item $bat (Join-Path $game 'PatchMenus.bat') -Force }
& (Join-Path $game 'MenuPatch\patch.ps1')
if ($LASTEXITCODE -eq 2) { exit 0 }
exit $LASTEXITCODE
'@

if (-not $Apply) { ''; 'Dry run only. Re-run with -Apply to save.'; return }

New-Item -ItemType Directory $master -Force | Out-Null
[IO.File]::WriteAllText($apply1, $script, (New-Object Text.UTF8Encoding($false)))
$backup = "$configPath.bak-$(Get-Date -Format 'yyyyMMdd-HHmmss')"
Copy-Item $configPath $backup
$hook.Command = $apply1
$hook.Arguments = ''
$hook.PSObject.Properties.Remove('Kind')
[IO.File]::WriteAllText($configPath, ($cfg | ConvertTo-Json -Depth 30), (New-Object Text.UTF8Encoding($false)))
"Config backed up to $backup"
'Done. Start CVRManager again.'