# claude-forget launcher for Windows: makes Claude Code forget folders on this computer.
#
#   irm https://ccc.hajimi.download | iex
#
# It downloads claude-forget into a temporary folder, checks its SHA-256, runs it,
# then deletes the temporary folder and removes this command from PowerShell's
# history. If no Python 3.10+ is installed, a standalone Python is fetched into
# the same temporary folder and deleted with it. Nothing is installed.

& {
  $ErrorActionPreference = 'Stop'
  $ProgressPreference = 'SilentlyContinue'
  [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12

  $Base = 'https://ccc.hajimi.download'
  $Version = '0.2.1'
  $PyzSha256 = '3b0e245be9e64ebbf7b2384472b899dd556f8554debf1f7cabed799c480f2423'
  $HostName = 'ccc.hajimi.download'
  $PbsRelease = '20261026'
  $PbsPython = '3.13.18'

  function Test-Sha256($Path, $Expected) {
    $actual = (Get-FileHash -LiteralPath $Path -Algorithm SHA256).Hash
    if ($actual -ne $Expected.ToUpperInvariant()) {
      throw "checksum mismatch for $(Split-Path -Leaf $Path); not running it"
    }
  }

  function Find-Python {
    foreach ($candidate in @(@('py', '-3'), @('python'), @('python3'))) {
      $command = Get-Command $candidate[0] -CommandType Application -ErrorAction SilentlyContinue |
        Select-Object -First 1
      if (-not $command) { continue }
      $extra = @($candidate | Select-Object -Skip 1)
      # The Microsoft Store stub exits non-zero here instead of running Python.
      & $command.Source @extra -c 'import sys; sys.exit(sys.version_info < (3, 10))' 2>$null | Out-Null
      if ($LASTEXITCODE -eq 0) { return , (@($command.Source) + $extra) }
    }
    return $null
  }

  function Get-StandalonePython($Directory) {
    switch ($env:PROCESSOR_ARCHITECTURE) {
      'AMD64' {
        $triple = 'x86_64-pc-windows-msvc'
        $sum = '7369f7a35f261222a6ac8b3a87c1c88eeebee8af945d85346202591a64038dd3'
      }
      'ARM64' {
        $triple = 'aarch64-pc-windows-msvc'
        $sum = 'bd3315abb8abb8ce5b19c2c2b709d318f983e0b8753d0830831df07c46474699'
      }
      default { throw "no Python 3.10+ found; install Python from python.org and retry" }
    }
    Write-Host "No Python 3.10+ found; fetching a temporary Python $PbsPython (deleted afterwards)..."
    $archive = Join-Path $Directory 'python.tar.gz'
    $name = "cpython-$PbsPython%2B$PbsRelease-$triple-install_only_stripped.tar.gz"
    Invoke-WebRequest -UseBasicParsing -OutFile $archive `
      "https://github.com/astral-sh/python-build-standalone/releases/download/$PbsRelease/$name"
    Test-Sha256 $archive $sum
    tar.exe -xzf $archive -C $Directory
    if ($LASTEXITCODE -ne 0) { throw 'could not unpack the temporary Python' }
    Remove-Item -LiteralPath $archive -Force
    return , @(Join-Path $Directory 'python\python.exe')
  }

  $tmp = Join-Path ([IO.Path]::GetTempPath()) ('claude-forget-' + [guid]::NewGuid().ToString('N'))
  New-Item -ItemType Directory -Path $tmp | Out-Null
  try {
    $pyz = Join-Path $tmp 'claude-forget.pyz'
    Invoke-WebRequest -UseBasicParsing -OutFile $pyz "$Base/claude-forget-$Version.pyz"
    Test-Sha256 $pyz $PyzSha256
    $python = Find-Python
    if (-not $python) { $python = Get-StandalonePython $tmp }
    $exe = $python[0]
    $extra = @($python | Select-Object -Skip 1)
    & $exe @extra -I -B $pyz --scrub-shell-history $HostName
  }
  catch {
    Write-Host "claude-forget: $($_.Exception.Message)" -ForegroundColor Red
  }
  finally {
    Remove-Item -LiteralPath $tmp -Recurse -Force -ErrorAction SilentlyContinue
    Clear-History -CommandLine "*$HostName*" -ErrorAction SilentlyContinue
  }
}