$ErrorActionPreference = "Stop"

param(
  [Parameter(Mandatory = $false)]
  [string]$RepoPath = "."
)

$invalidCharPattern = '[<>:""/|?*]'
$reserved = '^(CON|PRN|AUX|NUL|COM[1-9]|LPT[1-9])(\..*)?$'

$repoAbs = Resolve-Path $RepoPath
Push-Location $repoAbs

try {
  $paths = git ls-tree -r --name-only HEAD
  if (-not $paths) {
    Write-Output "Keine Dateien im Git-Tree gefunden."
    exit 0
  }

  $issues = @()
  foreach ($p in $paths) {
    $parts = $p -split '/'
    foreach ($part in $parts) {
      if ($part -match $invalidCharPattern) {
        $issues += "INVALID_CHAR: $p"
        break
      }
      if ($part -match $reserved) {
        $issues += "RESERVED_NAME: $p"
        break
      }
      if ($part.EndsWith(".") -or $part.EndsWith(" ")) {
        $issues += "TRAILING_DOT_SPACE: $p"
        break
      }
    }
    if ($p.Length -gt 245) {
      $issues += "POTENTIAL_LONG_PATH($($p.Length)): $p"
    }
  }

  if ($issues.Count -eq 0) {
    Write-Output "Keine offensichtlichen Windows-Pfadprobleme im aktuellen Commit gefunden."
    exit 0
  }

  $issues | Sort-Object -Unique | ForEach-Object { Write-Output $_ }
  exit 2
}
finally {
  Pop-Location
}