from pathlib import Path
from uuid import uuid4

import aiofiles
from fastapi import APIRouter, BackgroundTasks, File, HTTPException, UploadFile
from fastapi.responses import FileResponse

from sorawm.server.schemas import WMRemoveResults
from sorawm.server.worker import worker

router = APIRouter()


async def process_upload_and_queue(
    task_id: str, video_content: bytes, video_path: Path
):
    try:
        async with aiofiles.open(video_path, "wb") as f:
            await f.write(video_content)
        await worker.queue_task(task_id, video_path)
    except Exception as e:
        await worker.mark_task_error(task_id, str(e))


@router.post("/submit_remove_task")
async def submit_remove_task(
    background_tasks: BackgroundTasks, video: UploadFile = File(...)
):
    task_id = await worker.create_task()
    content = await video.read()
    upload_filename = f"{uuid4()}_{video.filename}"
    video_path = worker.upload_dir / upload_filename
    background_tasks.add_task(process_upload_and_queue, task_id, content, video_path)

    return {"task_id": task_id, "message": "Task submitted."}


@router.get("/get_results")
async def get_results(remove_task_id: str) -> WMRemoveResults:
    result = await worker.get_task_status(remove_task_id)
    if result is None:
        raise HTTPException(status_code=404, detail="Task does not exist.")

    return result


@router.get("/download/{task_id}")
async def download_video(task_id: str):
    result = await worker.get_task_status(task_id)
    if result is None:
        raise HTTPException(status_code=404, detail="Task does not exist.")
    if result.status != "FINISHED":
        raise HTTPException(
            status_code=400, detail=f"Task not finish yet: {result.status}"
        )
    output_path = await worker.get_output_path(task_id)
    if output_path is None or not output_path.exists():
        raise HTTPException(status_code=404, detail="Output file does not exits")

    return FileResponse(
        path=output_path, filename=output_path.name, media_type="video/mp4"
    )