"""Steam Web API client for player profile lookups.

Mirrors the shape of l4d2web/services/steam_workshop.py:17-43:
- single thread-local requests.Session
- 30s timeout
- HTTPS only

Difference: GetPlayerSummaries requires an API key in the querystring,
unlike the anonymous workshop endpoints.
"""
from __future__ import annotations

import threading
from dataclasses import dataclass
from typing import Iterable

import requests


GET_PLAYER_SUMMARIES_URL = (
    "https://api.steampowered.com/ISteamUser/GetPlayerSummaries/v0002/"
)

REQUEST_TIMEOUT_SECONDS = 30.0
MAX_IDS_PER_CALL = 100

_session_local = threading.local()


def _session() -> requests.Session:
    sess = getattr(_session_local, "session", None)
    if sess is None:
        sess = requests.Session()
        _session_local.session = sess
    return sess


def _session_get(url: str, params: dict, timeout: float = REQUEST_TIMEOUT_SECONDS):
    """Indirection seam so tests can monkeypatch a fake here."""
    return _session().get(url, params=params, timeout=timeout)


@dataclass(slots=True, frozen=True)
class SteamProfile:
    steam_id_64: str
    persona_name: str
    avatar_url: str


def fetch_profiles_batch(
    steam_ids: Iterable[str], *, api_key: str
) -> list[SteamProfile]:
    """Resolve a batch of SteamID64 strings to persona name + avatar URL.

    Steam's API caps each call at 100 IDs; this helper chunks transparently.
    IDs that Steam can't resolve (private, deleted) are simply absent from
    the response and from the returned list.
    """
    ids = list(steam_ids)
    out: list[SteamProfile] = []
    for i in range(0, len(ids), MAX_IDS_PER_CALL):
        chunk = ids[i : i + MAX_IDS_PER_CALL]
        params = {"key": api_key, "steamids": ",".join(chunk)}
        resp = _session_get(GET_PLAYER_SUMMARIES_URL, params=params)
        resp.raise_for_status()
        payload = resp.json() or {}
        players = (payload.get("response") or {}).get("players") or []
        for p in players:
            out.append(
                SteamProfile(
                    steam_id_64=str(p["steamid"]),
                    persona_name=str(p.get("personaname", "")),
                    avatar_url=str(p.get("avatarmedium", "")),
                )
            )
    return out