import logging
from typing import List, Dict, Optional
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy import select
from app.models.search_provider import SearchProvider

logger = logging.getLogger(__name__)

IGNORE_DOMAINS = [
    "google.com", "facebook.com", "twitter.com", "instagram.com",
    "youtube.com", "reddit.com", "amazon.com", "ebay.com",
    "wikipedia.org", "linkedin.com", "pinterest.com", "baidu.com",
    "bing.com",
]


class SearchService:
    def __init__(self, db: AsyncSession):
        self.db = db

    async def search(self, query: str, limit: int = 10) -> List[Dict[str, str]]:
        providers = await self._get_enabled_providers()
        for provider in providers:
            try:
                return await self._search_provider(provider, query, limit)
            except Exception as e:
                logger.warning(f"Search provider {provider.provider_type} failed: {e}")
        return []

    async def _get_enabled_providers(self) -> List[SearchProvider]:
        result = await self.db.execute(
            select(SearchProvider)
            .where(SearchProvider.enabled == True)
            .order_by(SearchProvider.priority)
        )
        return list(result.scalars().all())

    async def _search_provider(self, provider: SearchProvider, query: str, limit: int) -> List[Dict[str, str]]:
        pt = provider.provider_type
        if pt == "searxng":
            return await searxng_search(provider.api_endpoint, query, limit)
        elif pt == "bing":
            return await bing_search(provider.api_key, query, limit)
        else:
            raise ValueError(f"Unknown provider type: {pt}")


async def searxng_search(endpoint: Optional[str], query: str, limit: int) -> List[Dict[str, str]]:
    if not endpoint:
        raise ValueError("SearXNG endpoint not configured")
    import httpx
    async with httpx.AsyncClient(timeout=15.0) as client:
        resp = await client.get(
            endpoint.rstrip("/") + "/search",
            params={"q": query, "format": "json", "language": "zh-CN,en", "categories": "general"},
            headers={"User-Agent": "TradeMate/1.0"},
        )
        if resp.status_code != 200:
            raise ValueError(f"SearXNG returned {resp.status_code}")
        data = resp.json()
        results = []
        for item in (data.get("results", []) if isinstance(data, dict) else data):
            url = item.get("url", "")
            if any(d in url for d in IGNORE_DOMAINS):
                continue
            results.append({
                "title": (item.get("title") or url)[:100],
                "url": url.rstrip("/"),
                "snippet": (item.get("content") or item.get("snippet") or "")[:200],
            })
            if len(results) >= limit:
                break
        return results


async def bing_search(api_key: Optional[str], query: str, limit: int) -> List[Dict[str, str]]:
    if not api_key:
        raise ValueError("Bing API key not configured")
    import httpx
    async with httpx.AsyncClient(timeout=15.0) as client:
        resp = await client.get(
            "https://api.bing.microsoft.com/v7.0/search",
            params={"q": query, "count": min(limit, 50), "mkt": "en-US", "textFormat": "Raw"},
            headers={"Ocp-Apim-Subscription-Key": api_key},
        )
        if resp.status_code != 200:
            raise ValueError(f"Bing returned {resp.status_code}")
        data = resp.json()
        results = []
        for item in data.get("webPages", {}).get("value", []):
            url = item.get("url", "")
            if any(d in url for d in IGNORE_DOMAINS):
                continue
            results.append({
                "title": (item.get("name") or url)[:100],
                "url": url.rstrip("/"),
                "snippet": (item.get("snippet") or "")[:200],
            })
            if len(results) >= limit:
                break
        return results