import subprocess
from typing import Optional, List
from pathlib import Path
import shutil

def run(cmd: subprocess._CMD) -> subprocess.CompletedProcess[str]:
    """
    Run a subprocess command.

    Args:
        cmd: Command and arguments as a list.

    Raises:
        subprocess.CalledProcessError: If the command exits with a non-zero status.
    """
    try:
        result = subprocess.run(
            cmd,
            check=True,
            stdout=subprocess.PIPE,
            stderr=subprocess.STDOUT,
            text=True
        )
        return result
    except subprocess.CalledProcessError as e:
        print(e.stdout)
        raise

# def stick_together_audio(left_audio: Path, right_audio: Path, output_audio: Path) -> None:
#     """
#     Concatenate two audio files so that left_audio plays directly
#     before right_audio in the output file.
#     """

#     left_audio = Path(left_audio)
#     right_audio = Path(right_audio)
#     output_audio = Path(output_audio)

#     # Use stem instead of prefix to create a temporary file
#     output_audio_tmp = output_audio.parent / (output_audio.stem + "_temp" + output_audio.suffix)

#     run([
#         "ffmpeg",
#         "-y",
#         "-i", str(left_audio),
#         "-i", str(right_audio),
#         "-filter_complex", "[0:a][1:a]concat=n=2:v=0:a=1[a]",
#         "-map", "[a]",
#         "-c:a", "opus",   # or "aac" if you prefer
#         "-strict", "-2",
#         str(output_audio_tmp)
#     ])

#     shutil.move(output_audio_tmp, output_audio)
import tempfile

def stick_together_audio(left_audio: Path, right_audio: Path, output_audio: Path) -> None:
    left_audio = Path(left_audio)
    right_audio = Path(right_audio)
    output_audio = Path(output_audio)

    with tempfile.NamedTemporaryFile("w", delete=False, suffix=".txt") as f:
        f.write(f"file '{left_audio.resolve()}'\n")
        f.write(f"file '{right_audio.resolve()}'\n")
        list_file = f.name

    run([
        "ffmpeg",
        "-y",
        "-f", "concat",
        "-safe", "0",
        "-i", list_file,
        "-c", "copy",   # no re-encode
        str(output_audio)
    ])

file1 = Path("/home/honney/mount/Media/tmp/serien/ready/Clannad (2007) [tmdb-24835]/Season 02/Clannad Season 02 E01_german_audio.mka")
file2 = Path("/home/honney/mount/Media/tmp/serien/ready/Clannad (2007) [tmdb-24835]/Season 02/Clannad Season 02 E01_original_audio2.mka")
out = Path("/home/honney/mount/Media/tmp/serien/ready/Clannad (2007) [tmdb-24835]/Season 02/Clannad Season 02 E01_german_audio2.mka")

stick_together_audio(file1, file2, out)