import httpx

from app.core.config import settings

LASTFM_API_URL = "http://ws.audioscrobbler.com/2.0/"


async def get_user_info(username: str) -> dict | None:
    """Verify a Last.fm username exists and return basic info."""
    params = {
        "method": "user.getInfo",
        "user": username,
        "api_key": settings.LASTFM_API_KEY,
        "format": "json",
    }
    async with httpx.AsyncClient(timeout=15) as client:
        resp = await client.get(LASTFM_API_URL, params=params)

    if resp.status_code != 200:
        return None

    data = resp.json()
    if "error" in data:
        return None

    user = data.get("user", {})
    image_url = None
    images = user.get("image", [])
    for img in images:
        if img.get("size") == "large" and img.get("#text"):
            image_url = img["#text"]

    return {
        "name": user.get("name", username),
        "display_name": user.get("realname") or user.get("name", username),
        "playcount": int(user.get("playcount", 0)),
        "image_url": image_url,
        "url": user.get("url", ""),
    }


async def get_top_tracks(
    username: str, period: str = "overall", limit: int = 50
) -> list[dict]:
    """Fetch a user's top tracks from Last.fm.

    Args:
        username: Last.fm username.
        period: Time period - overall, 7day, 1month, 3month, 6month, 12month.
        limit: Max number of tracks to return (max 1000).

    Returns:
        List of dicts with: title, artist, playcount, image_url.
    """
    valid_periods = {"overall", "7day", "1month", "3month", "6month", "12month"}
    if period not in valid_periods:
        period = "overall"

    params = {
        "method": "user.getTopTracks",
        "user": username,
        "period": period,
        "limit": min(limit, 1000),
        "api_key": settings.LASTFM_API_KEY,
        "format": "json",
    }
    async with httpx.AsyncClient(timeout=30) as client:
        resp = await client.get(LASTFM_API_URL, params=params)

    if resp.status_code != 200:
        raise ValueError(f"Last.fm API returned status {resp.status_code}")

    data = resp.json()
    if "error" in data:
        raise ValueError(data.get("message", "Last.fm API error"))

    raw_tracks = data.get("toptracks", {}).get("track", [])
    tracks = []
    for t in raw_tracks:
        image_url = None
        images = t.get("image", [])
        for img in images:
            if img.get("size") == "large" and img.get("#text"):
                image_url = img["#text"]

        artist_name = ""
        artist = t.get("artist")
        if isinstance(artist, dict):
            artist_name = artist.get("name", "")
        elif isinstance(artist, str):
            artist_name = artist

        tracks.append({
            "title": t.get("name", "Unknown"),
            "artist": artist_name or "Unknown",
            "playcount": int(t.get("playcount", 0)),
            "image_url": image_url,
        })

    return tracks