# mautrix-instagram - A Matrix-Instagram puppeting bridge.
# Copyright (C) 2021 Tulir Asokan, Sumner Evans
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

from typing import Optional
from pathlib import Path
import asyncio
import logging
import mimetypes
import os
import shutil
import tempfile

log = logging.getLogger("mau.util.audio")


def abswhich(program: Optional[str]) -> Optional[str]:
    if program is None:
        return None
    path = shutil.which(program)
    return os.path.abspath(path) if path else None


async def to_ogg(data: bytes, mime: str) -> Optional[bytes]:
    default_ext = mimetypes.guess_extension(mime)
    with tempfile.TemporaryDirectory(prefix="mxsignal_audio_") as tmpdir:
        input_file_name = os.path.join(tmpdir, f"input{default_ext}")
        output_file_name = os.path.join(tmpdir, "output.ogg")
        with open(input_file_name, "wb") as file:
            file.write(data)
        proc = await asyncio.create_subprocess_exec(
            "ffmpeg",
            "-i",
            input_file_name,
            "-c:a",
            "libvorbis",
            output_file_name,
            stdout=asyncio.subprocess.PIPE,
            stdin=asyncio.subprocess.PIPE,
        )
        _, stderr = await proc.communicate()
        if proc.returncode == 0:
            with open(output_file_name, "rb") as file:
                return file.read()
        else:
            err_text = (
                stderr.decode("utf-8") if stderr is not None else f"unknown ({proc.returncode})"
            )
            raise ChildProcessError(f"ffmpeg error: {err_text}")


async def to_m4a(path_str: str) -> Optional[str]:
    path = Path(path_str)
    output_file_name = (path.parent / (path.stem + ".m4a")).absolute().as_posix()
    proc = await asyncio.create_subprocess_exec(
        "ffmpeg",
        "-i",
        path,
        "-c:a",
        "aac",
        output_file_name,
        stdout=asyncio.subprocess.PIPE,
        stdin=asyncio.subprocess.PIPE,
    )
    _, stderr = await proc.communicate()
    if proc.returncode == 0:
        path.unlink(missing_ok=True)
        return output_file_name
    else:
        err_text = stderr.decode("utf-8") if stderr is not None else f"unknown ({proc.returncode})"
        raise ChildProcessError(f"ffmpeg error: {err_text}")