from fastapi import FastAPI, BackgroundTasks, Response
from youtube_dl import YoutubeDL
from uuid import uuid4, UUID
from pydantic import BaseModel

backgroundJobs = {}
app = FastAPI()


class DownloadModel(BaseModel):
    url: str
    savePath: str


def report_state(id: str):
    def update(d):
        backgroundJobs[id]["state"] = d["status"]
        backgroundJobs[id]["_youtube-dl_"] = d
    return update


def load_video(url: str, file_path: str, id: str):
    opts = {
        "forcefilename": file_path,
        "progress_hooks": [report_state(id)]
    }
    with YoutubeDL(opts) as ydl:
        ydl.download([url])


@app.get("/api/info")
def info(url: str):
    with YoutubeDL({}) as ydl:
        return ydl.extract_info(url, False)


@app.post("/api/download")
def download(background_tasks: BackgroundTasks, model: DownloadModel):
    id = uuid4()
    backgroundJobs[id] = {"state": "created", "url": model.url, "savePath": model.savePath}
    background_tasks.add_task(load_video, model.url, model.savePath, id)
    return {"task": id}


@app.get("/api/status")
def status(response: Response, id: UUID):
    if id in backgroundJobs.keys():
        return backgroundJobs[id]

    response.status_code = 404
    return {"state": "not found"}


@app.delete("/api/clear")
def clear(response: Response, id: UUID):
    if id in backgroundJobs.keys():
        del backgroundJobs[id]
        return {"state": "done"}

    response.status_code = 404
    return {"state": "not found"}