"""Бесплатный интернет-агент с минимум 3 способами поиска"""
import re
import logging
import hashlib
from datetime import datetime, timedelta
from typing import Dict, List, Tuple, Any, Optional
from collections import Counter
import requests
from requests.adapters import HTTPAdapter
from urllib3.util.retry import Retry

class FreeInternetAgent:
    """Интернет-агент с бесплатными поисковыми системами"""

    def __init__(self, cache_ttl: int = 3600):
        self.session = requests.Session()
        retry = Retry(total=3, backoff_factor=1, status_forcelist=[500, 502, 503, 504])
        self.session.mount("https://", HTTPAdapter(max_retries=retry))
        self.session.headers.update({
            'User-Agent': 'PinkSky/7.0 (Linux; Research)'
        })
        self.cache: Dict[str, Tuple[Any, datetime]] = {}
        self.cache_ttl = cache_ttl
        self.logger = logging.getLogger(__name__)
        self._has_bs4 = False
        try:
            import bs4
            self._has_bs4 = True
        except ImportError:
            pass

        # SearXNG инстансы
        self.searxng_instances = [
            "https://searx.be",
            "https://search.bus-hit.me",
            "https://searx.nixnet.xyz",
            "https://searx.tuxcloud.net",
            "https://searx.moe",
        ]
        # Асинхронная проверка доступности при старте
        self.healthy_searxng = self._check_searxng_health()

    def _check_searxng_health(self) -> List[str]:
        healthy = []
        for instance in self.searxng_instances:
            try:
                response = self.session.get(f"{instance}/health", timeout=5)
                if response.status_code == 200:
                    healthy.append(instance)
            except Exception as e:
                self.logger.warning(f"SearXNG health check failed for {instance}: {e}")
        self.logger.info(f"Healthy SearXNG instances: {len(healthy)}/{len(self.searxng_instances)}")
        return healthy

    def _get_cache_key(self, *args, **kwargs) -> str:
        key = f"{args}_{sorted(kwargs.items())}"
        return hashlib.md5(key.encode()).hexdigest()

    def _get_from_cache(self, key: str) -> Optional[Any]:
        if key in self.cache:
            data, timestamp = self.cache[key]
            if datetime.now() - timestamp < timedelta(seconds=self.cache_ttl):
                return data
            else:
                del self.cache[key]
        return None

    def _save_to_cache(self, key: str, data: Any) -> None:
        self.cache[key] = (data, datetime.now())

    def search_web(self, query: str, num_results: int = 5) -> List[Dict[str, str]]:
        cache_key = self._get_cache_key('search', query, num_results)
        cached = self._get_from_cache(cache_key)
        if cached is not None:
            return cached

        results = []
        # Способ 1: SearXNG (мета-поиск)
        results = self._search_searxng(query, num_results)
        # Способ 2: DuckDuckGo API
        if not results:
            results = self._search_duckduckgo(query, num_results)
        # Способ 3: Google
        if not results:
            results = self._search_google(query, num_results)
        # Способ 4: Яндекс
        if not results and any(ord(c) > 1024 for c in query):
            results = self._search_yandex(query, num_results)

        self._save_to_cache(cache_key, results)
        return results

    def _search_searxng(self, query: str, num_results: int) -> List[Dict[str, str]]:
        if not self.healthy_searxng:
            self.healthy_searxng = self._check_searxng_health()
            if not self.healthy_searxng:
                self.logger.warning("No healthy SearXNG instances available")
                return []

        results = []
        for instance in self.healthy_searxng:
            try:
                url = f"{instance}/search"
                params = {
                    "q": query,
                    "format": "json",
                    "categories": "general",
                    "engines": "google,bing,duckduckgo,startpage",
                    "language": "en",
                    "pageno": 1
                }
                response = self.session.get(url, params=params, timeout=20)
                response.raise_for_status()
                data = response.json()
                if 'results' in data:
                    for item in data['results'][:num_results]:
                        results.append({
                            'title': item.get('title', '')[:100],
                            'url': item.get('url', ''),
                            'snippet': item.get('content', '')[:200],
                            'source': 'searxng',
                            'engine': item.get('engine', '')
                        })
                    self.logger.info(f"SearXNG ({instance}): {len(results)} results")
                    break
            except Exception as e:
                self.logger.warning(f"SearXNG error for {instance}: {e}")
                self.healthy_searxng.remove(instance)
        return results

# Удалить эту строку:
# INTERNET_AGENT = FreeInternetAgent(cache_ttl=3600)

# Вместо неё добавляем функцию-фабрику:
def get_internet_agent() -> FreeInternetAgent:
    """Lazy-инициализация интернет-агента с глобальным состоянием."""
    if not hasattr(get_internet_agent, 'instance'):
        get_internet_agent.instance = FreeInternetAgent(cache_ttl=3600)
    return get_internet_agent.instance