"""qBittorrent Web API 클라이언트.

API Docs: https://github.com/qbittorrent/qBittorrent/wiki/WebUI-API-(qBittorrent-4.1)
"""

import httpx
import logging
from dataclasses import dataclass
from typing import Optional

import config

logger = logging.getLogger("variet.tools.qbit")


@dataclass
class TorrentStatus:
    """토렌트 상태."""
    name: str
    hash: str
    progress: float         # 0.0 ~ 1.0
    state: str              # downloading, uploading, pausedDL, ...
    size: int               # bytes
    downloaded: int          # bytes
    upload_speed: int
    download_speed: int
    eta: int                # seconds, -1 = unknown
    save_path: str
    category: str


class QBitClient:
    """qBittorrent Web API 클라이언트."""

    def __init__(
        self,
        url: str = None,
        username: str = None,
        password: str = None,
    ):
        self.url = (url or getattr(config, "QBIT_URL", "http://localhost:8080")).rstrip("/")
        self.username = username or getattr(config, "QBIT_USERNAME", "admin")
        self.password = password or getattr(config, "QBIT_PASSWORD", "")
        self._sid: Optional[str] = None

    async def login(self) -> bool:
        """로그인 → SID 쿠키 획득."""
        async with httpx.AsyncClient(timeout=10) as client:
            resp = await client.post(
                f"{self.url}/api/v2/auth/login",
                data={"username": self.username, "password": self.password},
            )
            if resp.text.strip().lower() == "ok.":
                self._sid = resp.cookies.get("SID")
                logger.info("qBittorrent 로그인 성공")
                return True
            else:
                logger.error(f"qBittorrent 로그인 실패: {resp.text}")
                return False

    def _cookies(self) -> dict:
        return {"SID": self._sid} if self._sid else {}

    async def _ensure_login(self):
        if not self._sid:
            if not await self.login():
                raise RuntimeError("qBittorrent 로그인 실패")

    async def add_torrent(
        self,
        magnet_or_url: str,
        save_path: str = "",
        category: str = "anime",
        tags: str = "",
    ) -> bool:
        """토렌트 추가 (magnet 링크 또는 .torrent URL).

        Args:
            magnet_or_url: magnet 링크 또는 .torrent URL
            save_path: 저장 경로 (미지정 시 qBittorrent 기본)
            category: 카테고리
            tags: 태그 (쉼표 구분)
        """
        await self._ensure_login()

        data = {
            "urls": magnet_or_url,
            "category": category,
        }
        if save_path:
            data["savepath"] = save_path
        if tags:
            data["tags"] = tags

        async with httpx.AsyncClient(timeout=30) as client:
            resp = await client.post(
                f"{self.url}/api/v2/torrents/add",
                data=data,
                cookies=self._cookies(),
            )

        if resp.text.strip().lower() == "ok.":
            logger.info(f"토렌트 추가 성공: {magnet_or_url[:60]}... → {save_path}")
            return True
        else:
            logger.error(f"토렌트 추가 실패: {resp.text}")
            return False

    async def get_torrent_status(self, info_hash: str) -> Optional[TorrentStatus]:
        """특정 토렌트 상태 조회."""
        await self._ensure_login()

        async with httpx.AsyncClient(timeout=10) as client:
            resp = await client.get(
                f"{self.url}/api/v2/torrents/info",
                params={"hashes": info_hash},
                cookies=self._cookies(),
            )
            resp.raise_for_status()
            data = resp.json()

        if not data:
            return None

        t = data[0]
        return TorrentStatus(
            name=t.get("name", ""),
            hash=t.get("hash", ""),
            progress=t.get("progress", 0),
            state=t.get("state", ""),
            size=t.get("total_size", 0),
            downloaded=t.get("downloaded", 0),
            upload_speed=t.get("upspeed", 0),
            download_speed=t.get("dlspeed", 0),
            eta=t.get("eta", -1),
            save_path=t.get("save_path", ""),
            category=t.get("category", ""),
        )

    async def list_torrents(self, category: str = "") -> list[TorrentStatus]:
        """토렌트 목록 조회."""
        await self._ensure_login()

        params = {}
        if category:
            params["category"] = category

        async with httpx.AsyncClient(timeout=10) as client:
            resp = await client.get(
                f"{self.url}/api/v2/torrents/info",
                params=params,
                cookies=self._cookies(),
            )
            resp.raise_for_status()
            data = resp.json()

        return [
            TorrentStatus(
                name=t.get("name", ""),
                hash=t.get("hash", ""),
                progress=t.get("progress", 0),
                state=t.get("state", ""),
                size=t.get("total_size", 0),
                downloaded=t.get("downloaded", 0),
                upload_speed=t.get("upspeed", 0),
                download_speed=t.get("dlspeed", 0),
                eta=t.get("eta", -1),
                save_path=t.get("save_path", ""),
                category=t.get("category", ""),
            )
            for t in data
        ]

    async def test_connection(self) -> dict:
        """연결 테스트 — 버전 정보 반환."""
        try:
            await self._ensure_login()
            async with httpx.AsyncClient(timeout=10) as client:
                resp = await client.get(
                    f"{self.url}/api/v2/app/version",
                    cookies=self._cookies(),
                )
                version = resp.text.strip()

                resp2 = await client.get(
                    f"{self.url}/api/v2/app/webapiVersion",
                    cookies=self._cookies(),
                )
                api_version = resp2.text.strip()

            return {
                "connected": True,
                "version": version,
                "api_version": api_version,
                "url": self.url,
            }
        except Exception as e:
            return {"connected": False, "error": str(e), "url": self.url}