from fastapi import APIRouter, HTTPException
from pydantic import BaseModel
from fastapi.responses import FileResponse
from pathlib import Path
import asyncio

router = APIRouter(prefix="/moviepy", tags=["moviepy"])


class VideoToMp3Request(BaseModel):
    filename: str


class VideoToWavRequest(BaseModel):
    filename: str


def _run_moviepy(src: Path, dest: Path):
    from moviepy import VideoFileClip

    clip = VideoFileClip(str(src))
    try:
        if clip.audio is None:
            raise RuntimeError("Source file has no audio stream")
        clip.audio.write_audiofile(str(dest), codec="libmp3lame", bitrate="192k")
    finally:
        clip.close()


def _run_moviepy_to_wav(src: Path, dest: Path):
    from moviepy import VideoFileClip

    clip = VideoFileClip(str(src))
    try:
        if clip.audio is None:
            raise RuntimeError("Source file has no audio stream")
        clip.audio.write_audiofile(str(dest), fps=16000, nbytes=2)
    finally:
        clip.close()


@router.post("/video-to-mp3")
async def video_to_mp3(req: VideoToMp3Request):
    try:
        import moviepy  # noqa: F401
    except Exception:
        raise HTTPException(status_code=503, detail="moviepy is not installed in the runtime. Install moviepy/imageio-ffmpeg")

    project_root = Path(__file__).resolve().parent.parent.parent
    data_dir = project_root / "data"
    src = (data_dir / req.filename).resolve()
    try:
        src.relative_to(data_dir)
    except Exception:
        raise HTTPException(status_code=400, detail="Invalid filename")
    if not src.exists() or not src.is_file():
        raise HTTPException(status_code=404, detail="Source file not found")

    out_dir = data_dir / "audio"
    out_dir.mkdir(parents=True, exist_ok=True)
    dest = out_dir / f"{src.stem}.mp3"

    try:
        await asyncio.get_running_loop().run_in_executor(None, _run_moviepy, src, dest)
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"conversion failed: {e}")

    return FileResponse(str(dest), filename=dest.name, media_type="audio/mpeg")


@router.post("/video-to-wav")
async def video_to_wav(req: VideoToWavRequest):
    try:
        import moviepy  # noqa: F401
    except Exception:
        raise HTTPException(status_code=503, detail="moviepy is not installed in the runtime. Install moviepy/imageio-ffmpeg")

    project_root = Path(__file__).resolve().parent.parent.parent
    data_dir = project_root / "data"
    src = (data_dir / req.filename).resolve()
    try:
        src.relative_to(data_dir)
    except Exception:
        raise HTTPException(status_code=400, detail="Invalid filename")
    if not src.exists() or not src.is_file():
        raise HTTPException(status_code=404, detail="Source file not found")

    out_dir = data_dir / "audio"
    out_dir.mkdir(parents=True, exist_ok=True)
    dest = out_dir / f"{src.stem}.wav"

    try:
        await asyncio.get_running_loop().run_in_executor(None, _run_moviepy_to_wav, src, dest)
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"conversion failed: {e}")

    return FileResponse(str(dest), filename=dest.name, media_type="audio/wav")