"""NZBGet (JSON-RPC over HTTP basic) and qBittorrent (cookie session) clients."""

from __future__ import annotations

import aiohttp


class DownloadError(RuntimeError):
    pass


class NzbgetClient:
    def __init__(self, session: aiohttp.ClientSession, base_url: str,
                 username: str, password: str) -> None:
        self.session = session
        self.base = base_url.rstrip("/")
        self.auth = aiohttp.BasicAuth(username, password)

    async def _rpc(self, method: str, params: list | None = None) -> dict | list:
        body = {"method": method, "params": params or [], "id": 1}
        async with self.session.post(f"{self.base}/jsonrpc", json=body, auth=self.auth) as r:
            if r.status >= 400:
                raise DownloadError(f"NZBGet {method} → {r.status}: {(await r.text())[:200]}")
            data = await r.json()
        if "error" in data and data["error"]:
            raise DownloadError(f"NZBGet {method}: {data['error']}")
        return data.get("result", [])

    async def listgroups(self) -> list[dict]:
        return await self._rpc("listgroups")  # type: ignore[return-value]


class QbtClient:
    def __init__(self, session: aiohttp.ClientSession, base_url: str,
                 username: str, password: str) -> None:
        self.session = session
        self.base = base_url.rstrip("/")
        self.username = username
        self.password = password
        self._logged_in = False

    async def _login(self) -> None:
        async with self.session.post(
            f"{self.base}/api/v2/auth/login",
            data={"username": self.username, "password": self.password},
            headers={"Referer": self.base},
        ) as r:
            text = (await r.text()).strip()
            if r.status >= 400 or text != "Ok.":
                raise DownloadError(f"qBt login → {r.status}: {text[:200]}")
        self._logged_in = True

    async def _get(self, path: str, params: dict | None = None) -> list | dict:
        if not self._logged_in:
            await self._login()
        async with self.session.get(f"{self.base}{path}", params=params) as r:
            if r.status == 403:
                self._logged_in = False
                await self._login()
                async with self.session.get(f"{self.base}{path}", params=params) as r2:
                    if r2.status >= 400:
                        raise DownloadError(f"qBt GET {path} → {r2.status}")
                    return await r2.json()
            if r.status >= 400:
                raise DownloadError(f"qBt GET {path} → {r.status}: {(await r.text())[:200]}")
            return await r.json()

    async def downloading(self) -> list[dict]:
        data = await self._get("/api/v2/torrents/info", params={"filter": "downloading"})
        return data if isinstance(data, list) else []