team-1/backend/src/song_fetch.py

import requests
import urllib.parse
import os.path
import os
import sys
from dataclasses import dataclass

sys.path.append("/yt-dlp")
import yt_dlp


@dataclass
class SongInfo:
    artist: str
    title: str
    img_id: str
    tags: list[str]


def _lastfm_search(query: str) -> tuple[str, str]:
    response = requests.get(
        url="https://ws.audioscrobbler.com/2.0/?method=track.search&format=json",
        params={"limit": 5, "track": query, "api_key": os.environ["LASTFM_API_KEY"]},
    )

    assert response.status_code == 200

    track_info = response.json()["results"]["trackmatches"]["track"][0]

    return track_info["name"], track_info["artist"]


def _lastfm_getinfo(name: str, artist: str) -> tuple[str, list[str]]:  # ( image_id, tags )
    response = requests.get(
        url="https://ws.audioscrobbler.com/2.0/?method=track.getInfo&format=json",
        params={
            "track": name,
            "artist": artist,
            "api_key": os.environ["LASTFM_API_KEY"],
        },
    )

    track_info = response.json()["track"]

    image_url = urllib.parse.urlparse(track_info["album"]["image"][0]["#text"])

    return (
        # track_info["mbid"],
        os.path.splitext(os.path.basename(image_url.path))[0],
        [t["name"] for t in track_info["toptags"]["tag"]],
    )


def lastfm_query_search(query: str) -> SongInfo:
    name, artist = _lastfm_search(query)

    img_id, tags = _lastfm_getinfo(name, artist)

    return SongInfo(artist=artist, title=name, img_id=img_id, tags=tags)


def download_song_mp3(name: str, artist: str) -> tuple[str, str] | None:  # ( id, audio )
    ydl_opts = {
        "format": "bestaudio",
        "default_search": "ytsearch1",
        "outtmpl": "%(title)s.%(ext)s",
        "skip_download": True,
    }

    with yt_dlp.YoutubeDL(ydl_opts) as ydl:
        info = ydl.extract_info(f"{name!r} - {artist!r}", download=False)

    first_entry = info["entries"][0]

    video_id = first_entry["id"]

    for fmt in first_entry["formats"]:
        if "acodec" in fmt and fmt["acodec"] != "none":
            return video_id, fmt["url"]

    return None