$ErrorActionPreference = 'Stop'

$root = 'apps/game_server/src/behavior_tree'
$changed = 0
Get-ChildItem $root -Recurse -Filter *.erl | ForEach-Object {
  $path = $_.FullName
  $text = [IO.File]::ReadAllText($path)
  if ($text -notmatch '-include\("bt_game\.hrl"\)\.' -and
      ($text -match '\btree_node\(\)' -or $text -match '#tree_node\{' -or $text -match '\bblackboard\(\)' -or $text -match '\bbt_status\(\)')) {
    $rx = [regex]::new('(^-module\([^)]+\)\.\s*)', [Text.RegularExpressions.RegexOptions]::Multiline)
    $new = $rx.Replace($text, "`$1`r`n-include(`"bt_game.hrl`").`r`n", 1)
    if ($new -ne $text) {
      if ($_.IsReadOnly) { $_.IsReadOnly = $false }
      [IO.File]::WriteAllText($path, $new)
      $changed++
    }
  }
}

"changed_files=$changed"