[CmdletBinding()]
param([switch]$DryRun, [switch]$Undo)
$ErrorActionPreference = 'Stop'
[Console]::OutputEncoding = [Text.UTF8Encoding]::new($false)
$OutputEncoding = [Console]::OutputEncoding
$BaseUrl = 'https://ai.mertcankarakulak.com/v1'
$Model = 'abliteration-abliterated-model-large-flash'
$BeginMark = '# BEGIN MERT_AI_MANAGED'
$EndMark = '# END MERT_AI_MANAGED'
$CodexDir = if ($env:CODEX_HOME) { $env:CODEX_HOME } else { Join-Path $HOME '.codex' }
$ConfigFile = Join-Path $CodexDir 'config.toml'
$EnvFile = Join-Path $CodexDir '.env'

function Get-LatestBackup([string]$Path) {
  Get-ChildItem -LiteralPath (Split-Path $Path) -Filter ((Split-Path $Path -Leaf) + '.mert-ai.*.bak') -ErrorAction SilentlyContinue |
    Sort-Object LastWriteTimeUtc -Descending | Select-Object -First 1
}
if ($Undo) {
  $restored = $false
  foreach ($path in @($ConfigFile, $EnvFile)) {
    $backup = Get-LatestBackup $path
    if ($backup) { Copy-Item -LiteralPath $backup.FullName -Destination $path -Force; $restored = $true }
  }
  if (-not $restored) { throw 'Geri alınacak Mert AI yedeği bulunamadı.' }
  Write-Host 'Son Mert AI yedeği geri yüklendi.'; exit 0
}

Write-Host "Codex dizini: $CodexDir"
Write-Host "Provider: Mert AI · $Model"
if ($DryRun) {
  Write-Host 'Dry-run: config.toml ve .env yedeklenip yalnız Mert AI bloğu güncellenecek.'; exit 0
}

$ApiKey = $env:MERT_AI_API_KEY
if (-not $ApiKey) {
  $secure = Read-Host 'Mert AI API anahtarı' -AsSecureString
  $ptr = [Runtime.InteropServices.Marshal]::SecureStringToBSTR($secure)
  try { $ApiKey = [Runtime.InteropServices.Marshal]::PtrToStringBSTR($ptr) }
  finally { [Runtime.InteropServices.Marshal]::ZeroFreeBSTR($ptr) }
}
if (-not $ApiKey) { throw 'API anahtarı boş olamaz.' }
try {
  $models = Invoke-RestMethod -Uri "$BaseUrl/models" -Headers @{ Authorization = "Bearer $ApiKey" } -TimeoutSec 30
  if (-not ($models.data.id -contains $Model)) { throw 'Model listede bulunamadı.' }
} catch { $ApiKey = $null; throw 'Anahtar veya model doğrulanamadı; hiçbir dosya değiştirilmedi.' }

New-Item -ItemType Directory -Path $CodexDir -Force | Out-Null
$stamp = (Get-Date).ToUniversalTime().ToString('yyyyMMddTHHmmssZ')
foreach ($path in @($ConfigFile, $EnvFile)) {
  if (Test-Path -LiteralPath $path) { Copy-Item -LiteralPath $path -Destination "$path.mert-ai.$stamp.bak" }
}

function Remove-ManagedBlock([string[]]$Lines, [switch]$Config) {
  $result = [Collections.Generic.List[string]]::new(); $managed = $false; $table = $false
  foreach ($line in $Lines) {
    if ($line -eq $BeginMark) { $managed = $true; continue }
    if ($line -eq $EndMark) { $managed = $false; continue }
    if ($managed) { continue }
    if ($Config -and $line -match '^\s*\[') { $table = $true }
    if ($Config -and -not $table -and $line -match '^\s*model(_provider)?\s*=') { continue }
    if (-not $Config -and $line -match '^\s*MERT_AI_API_KEY=') { continue }
    $result.Add($line)
  }
  return $result
}
$configLines = if (Test-Path $ConfigFile) { Get-Content -LiteralPath $ConfigFile } else { @() }
$configLines = Remove-ManagedBlock $configLines -Config
$configBlock = @('', $BeginMark, "model = `"$Model`"", 'model_provider = "mertai"', '', '[model_providers.mertai]', 'name = "Mert AI"', "base_url = `"$BaseUrl`"", 'env_key = "MERT_AI_API_KEY"', 'wire_api = "responses"', $EndMark)
[IO.File]::WriteAllLines($ConfigFile, @($configLines) + $configBlock, [Text.UTF8Encoding]::new($false))

$envLines = if (Test-Path $EnvFile) { Get-Content -LiteralPath $EnvFile } else { @() }
$envLines = Remove-ManagedBlock $envLines
[IO.File]::WriteAllLines($EnvFile, @($envLines) + @('', $BeginMark, "MERT_AI_API_KEY=$ApiKey", $EndMark), [Text.UTF8Encoding]::new($false))
$ApiKey = $null
Write-Host 'Kurulum tamamlandı. Codex CLI, masaüstü veya IDE eklentisini tamamen kapatıp yeniden açın.'
Write-Host 'CLI doğrulaması: codex /status'