"""Knaben torrent search API client."""

import logging
from typing import Any

import requests
from requests.exceptions import HTTPError, RequestException, Timeout

from agent.config import Settings, settings

from .dto import TorrentResult
from .exceptions import KnabenAPIError, KnabenNotFoundError

logger = logging.getLogger(__name__)


class KnabenClient:
    """
    Client for interacting with Knaben torrent search API.

    Knaben is a torrent search engine that aggregates results from multiple trackers.

    Example:
        >>> client = KnabenClient()
        >>> results = client.search("Inception 1080p")
        >>> for torrent in results[:5]:
        ...     print(f"{torrent.name} - Seeders: {torrent.seeders}")
    """

    def __init__(
        self,
        base_url: str | None = None,
        timeout: int | None = None,
        config: Settings | None = None,
    ):
        """
        Initialize Knaben client.

        Args:
            base_url: Knaben API base URL (defaults to https://api.knaben.org/v1)
            timeout: Request timeout in seconds (defaults to settings)
            config: Optional Settings instance (for testing)

        Note:
            Knaben API doesn't require an API key
        """
        cfg = config or settings

        self.base_url = base_url or "https://api.knaben.org/v1"
        self.timeout = timeout or cfg.request_timeout

        logger.info("Knaben client initialized")

    def _make_request(self, params: dict[str, Any] | None = None) -> dict[str, Any]:
        """
        Make a request to Knaben API.

        Args:
            params: Query parameters

        Returns:
            JSON response as dict

        Raises:
            KnabenAPIError: If request fails
        """
        try:
            logger.debug(f"Knaben request with params: {params}")
            response = requests.post(self.base_url, json=params, timeout=self.timeout)
            response.raise_for_status()
            return response.json()

        except Timeout as e:
            logger.error(f"Knaben API timeout: {e}")
            raise KnabenAPIError(f"Request timeout after {self.timeout} seconds") from e

        except HTTPError as e:
            logger.error(f"Knaben API HTTP error: {e}")
            if e.response is not None:
                status_code = e.response.status_code
                if status_code == 404:
                    raise KnabenNotFoundError("Resource not found") from e
                elif status_code == 429:
                    raise KnabenAPIError("Rate limit exceeded") from e
                else:
                    raise KnabenAPIError(f"HTTP {status_code}: {e}") from e
            raise KnabenAPIError(f"HTTP error: {e}") from e

        except RequestException as e:
            logger.error(f"Knaben API request failed: {e}")
            raise KnabenAPIError(f"Failed to connect to Knaben API: {e}") from e

    def search(self, query: str, limit: int = 10) -> list[TorrentResult]:
        """
        Search for torrents.

        Args:
            query: Search query (e.g., "Inception 1080p")
            limit: Maximum number of results (default: 10)

        Returns:
            List of TorrentResult objects

        Raises:
            KnabenAPIError: If request fails
            ValueError: If query is invalid
        """
        if not query or not isinstance(query, str):
            raise ValueError("Query must be a non-empty string")

        if len(query) > 500:
            raise ValueError("Query is too long (max 500 characters)")

        # Build params
        params = {
            "query": query,
            "search_field": "title",
            "order_by": "peers",
            "order_direction": "desc",
            "from": 0,
            "size": limit,
            "hide_unsafe": True,
            "hide_xxx": True,
        }

        try:
            data = self._make_request(params)
        except KnabenNotFoundError:
            logger.info(f"No torrents found for '{query}'")
            return []
        except Exception as e:
            logger.error(f"Unexpected error in search: {e}", exc_info=True)
            raise

        # Parse results
        results = []
        torrents = data.get("hits", [])

        if not torrents:
            logger.info(f"No torrents found for '{query}'")
            return []

        for torrent in torrents:
            try:
                result = self._parse_torrent(torrent)
                results.append(result)
            except Exception as e:
                logger.warning(f"Failed to parse torrent: {e}")
                continue

        logger.info(f"Found {len(results)} torrents for '{query}'")
        return results

    def _parse_torrent(self, torrent: dict[str, Any]) -> TorrentResult:
        """
        Parse a torrent result into a TorrentResult object.

        Args:
            torrent: Raw torrent dict from API

        Returns:
            TorrentResult object
        """
        # Extract required fields (API uses camelCase)
        title = torrent.get("title", "Unknown")
        size = torrent.get("size", "Unknown")
        seeders = int(torrent.get("seeders", 0) or 0)
        leechers = int(torrent.get("leechers", 0) or 0)
        magnet = torrent.get("magnetUrl", "")

        # Extract optional fields
        info_hash = torrent.get("hash")
        tracker = torrent.get("tracker")
        upload_date = torrent.get("date")
        category = torrent.get("category")

        return TorrentResult(
            title=title,
            size=size,
            seeders=seeders,
            leechers=leechers,
            magnet=magnet,
            info_hash=info_hash,
            tracker=tracker,
            upload_date=upload_date,
            category=category,
        )