fix_extensions.ps1

# fix_extensions.ps1 - Detect and fix incorrect file extensions in the mp3files folder.
#
# Some audio files (like 'Simple Plan - Jet Lag' and 'Projekt F - Blue Neon') are actually MPEG-4 (M4A) files
# but have been incorrectly named with the .mp3 extension. This causes playback issues on VLC and other players
# because the server serves them with an incorrect MIME type (audio/mpeg instead of audio/mp4).
#
# This script reads the file header (magic bytes) to detect the true format and renames the file if necessary.

$MusicDir = Join-Path $PSScriptRoot "mp3files"

if (-not (Test-Path $MusicDir)) {
    Write-Error "Music directory not found at $MusicDir"
    exit 1
}

$Files = Get-ChildItem -Path $MusicDir -File

$RenamedCount = 0

foreach ($File in $Files) {
    $FilePath = $File.FullName
    
    # Open file stream and read the first 12 bytes
    try {
        $Stream = [System.IO.File]::OpenRead($FilePath)
        $Buffer = New-Object byte[] 12
        $BytesRead = $Stream.Read($Buffer, 0, 12)
        $Stream.Close()
    }
    catch {
        Write-Warning "Could not read file header for: $($File.Name)"
        continue
    }

    if ($BytesRead -lt 8) {
        continue
    }

    # Check for 'ftyp' at offset 4 (MPEG-4 container: M4A, MP4)
    # Hex for 'ftyp' is 0x66 0x74 0x79 0x70
    $IsM4A = $Buffer[4] -eq 0x66 -and $Buffer[5] -eq 0x74 -and $Buffer[6] -eq 0x79 -and $Buffer[7] -eq 0x70

    # Check for 'ID3' at offset 0 (MP3 with ID3v2 tag)
    $IsID3 = $Buffer[0] -eq 0x49 -and $Buffer[1] -eq 0x44 -and $Buffer[2] -eq 0x33

    $CurrentExt = $File.Extension.ToLower()
    $NewExt = $null

    if ($IsM4A -and $CurrentExt -ne ".m4a") {
        $NewExt = ".m4a"
    } elseif ($IsID3 -and $CurrentExt -ne ".mp3") {
        $NewExt = ".mp3"
    }

    if ($NewExt) {
        $NewName = [System.IO.Path]::ChangeExtension($File.Name, $NewExt)
        $NewPath = Join-Path $MusicDir $NewName
        
        Write-Host "Fixing: '$($File.Name)' -> '$NewName' (detected true format as $(if ($NewExt -eq '.m4a') {'M4A'} else {'MP3'}))" -ForegroundColor Yellow
        
        try {
            Rename-Item -LiteralPath $FilePath -NewName $NewName -Force
            $RenamedCount++
        }
        catch {
            Write-Error "Failed to rename $($File.Name): $_"
        }
    }
}

if ($RenamedCount -gt 0) {
    Write-Host "`nSuccessfully renamed $RenamedCount file(s)." -ForegroundColor Green
    Write-Host "Regenerating playlist.m3u..." -ForegroundColor Cyan
    python generate_playlist.py
    Write-Host "Done! Please commit and push the renamed files to GitHub to update your cloud stream." -ForegroundColor Green
} else {
    Write-Host "`nAll files have correct extensions. No renaming needed." -ForegroundColor Green
}