import os
import subprocess
import json

def get_mp3_bitrate(file_path):
    """Extract bitrate (in kbps) using ffprobe."""
    cmd = [
        "ffprobe",
        "-v", "quiet",
        "-print_format", "json",
        "-show_streams",
        file_path
    ]
    try:
        result = subprocess.run(cmd, capture_output=True, text=True)
        info = json.loads(result.stdout)
        for stream in info["streams"]:
            if stream.get("codec_type") == "audio":
                return int(int(stream["bit_rate"]) / 1000)
    except Exception:
        pass
    return 192  # fallback bitrate if detection fails


def convert_mp3_to_mp4(root_folder):
    for dirpath, _, filenames in os.walk(root_folder):
        for filename in filenames:
            if filename.lower().endswith(".mp3"):
                input_path = os.path.join(dirpath, filename)
                output_path = os.path.splitext(input_path)[0] + ".mp4"

                bitrate = get_mp3_bitrate(input_path)
                print(f"Converting: {input_path}  (bitrate: {bitrate}k)")

                cmd = [
                    "ffmpeg",
                    "-i", input_path,
                    "-c:a", "aac",            # convert to AAC for MP4 container
                    "-b:a", f"{bitrate}k",    # use detected bitrate
                    "-vn",                    # no video
                    "-y",                     # overwrite existing file
                    output_path
                ]

                subprocess.run(cmd, stdout=subprocess.DEVNULL, stderr=subprocess.STDOUT)
                print(f" ? {output_path}")


if __name__ == "__main__":
    convert_mp3_to_mp4(".")