Script that copies and renames subtitle files from the 'Subs' folder to the folder containing the media file

subtitles.ps1

<#
    This script copies and renames subtitle files from the 'Subs' folder to the folder containing the media files.
    It works recursively through all child folders.
    The user can configure the languages, video formats, and subtitle formats to process.
    Larger subtitle files are prioritized when multiple files are found for the same language.
#>

# Configuration
$languageMap = @{
    "English" = "en"
    "Czech"   = "cs"
}

$videoFormats = @("mp4", "avi", "mkv")
$subtitleFormats = @("srt")

function Copy-RenameSubtitles($directory) {
    $mediaFiles = Get-ChildItem -Path $directory -Include ($videoFormats | ForEach-Object { "*.$_"}) -Recurse -File
    $subsFolder = Join-Path -Path $directory -ChildPath "Subs"

    if (Test-Path $subsFolder) {
        foreach ($mediaFile in $mediaFiles) {
            $mediaFileBaseName = [System.IO.Path]::GetFileNameWithoutExtension($mediaFile.FullName)

            foreach ($entry in $languageMap.GetEnumerator()) {
                $language = $entry.Key
                $languageCode = $entry.Value

                $subtitleFiles = Get-ChildItem -Path $subsFolder -Filter "*$language*.srt" -Recurse -File
                $largestSubtitleFile = $subtitleFiles | Sort-Object -Property Length -Descending | Select-Object -First 1

                if ($largestSubtitleFile) {
                    $newSubtitleFileName = "{0}.{1}.{2}" -f $mediaFileBaseName, $languageCode, $subtitleFormats[0]
                    $destinationPath = Join-Path -Path $mediaFile.Directory.FullName -ChildPath $newSubtitleFileName
                    if (-not (Test-Path $destinationPath)) {
                        Copy-Item -Path $largestSubtitleFile.FullName -Destination $destinationPath -Verbose
                    }
                }
            }
        }
    }

    # Continue processing in subdirectories
    $childDirectories = Get-ChildItem -Path $directory -Directory
    foreach ($childDir in $childDirectories) {
        Copy-RenameSubtitles $childDir.FullName
    }
}

# Start processing in the specified directory or the current directory if none provided
$currentDirectory = if ($args[0]) { $args[0] } else { Get-Location }
Copy-RenameSubtitles $currentDirectory