import json
import logging
from typing import Literal


def playlist(items: list[str]) -> str:
    return json.dumps({
        "type": "items",
        "data": items,
    })


type YdlLogLevel = Literal['debug'] | Literal['warning'] | Literal['error']

def ydl_log(level: YdlLogLevel, msg: str) -> str:
    return json.dumps({
        "type": "ydl_log",
        "level": level,
        "data": msg,
    })

def ydl_end(ret: int) -> str:
    return json.dumps({
        "type": "ydl_end",
        "data": ret,
    })


def error(ex: Exception) -> str:
    logging.getLogger('musicdlp').exception(ex)
    return json.dumps({
        "type": "error",
        "data": {
            "type": ex.__class__.__qualname__,
            "message": str(ex),
        }
    })