"""
AnySearch 联网检索客户端
======================
调用 AnySearch 网页/领域搜索 API (https://api.anysearch.com/v1/search)，
为 AI 聊天注入实时联网检索结果，亦可被后端端点 / Agent 工具复用。

约束：平台容器存在智能路由代理，对外部 API 偶发重置；本客户端使用
trust_env=False 直连 (等价于 NO_PROXY=api.anysearch.com)，规避代理重置。
失败一律返回空/降级结果，保证聊天链路不中断。
"""
import json
import logging
from typing import List, Dict, Optional

logger = logging.getLogger("aiflow.anysearch")

DEFAULT_API_URL = "https://api.anysearch.com/v1/search"
DEFAULT_ZONE = "cn"
REQUEST_TIMEOUT = 8.0


async def anysearch_search(
    api_key: str,
    api_url: str = DEFAULT_API_URL,
    query: str = "",
    top_k: int = 5,
    zone: str = DEFAULT_ZONE,
    freshness: Optional[str] = None,
    timeout: float = REQUEST_TIMEOUT,
) -> List[Dict]:
    """调用 AnySearch 搜索，返回结构化结果列表。

    每个结果:
        {
            "content": snippet 摘要文本,
            "score": 0.9..0.5 递减,
            "source": "web_anysearch",
            "metadata": {"url", "title", "source_domain", "zone"}
        }
    失败时返回 [] (不抛异常)。
    """
    if not api_key:
        return []
    try:
        import httpx
    except ImportError:
        logger.warning("httpx not available for AnySearch")
        return []

    payload = {
        "query": query,
        "zone": zone,
        "top_k": max(1, min(int(top_k), 20)),
    }
    if freshness:
        payload["freshness"] = freshness

    headers = {
        "Content-Type": "application/json",
        "Authorization": f"Bearer {api_key}",
    }
    try:
        # trust_env=False -> 忽略容器内 HTTP(S)_PROXY，直连 api.anysearch.com
        async with httpx.AsyncClient(trust_env=False, timeout=timeout) as client:
            resp = await client.post(api_url, json=payload, headers=headers)
        if resp.status_code != 200:
            logger.warning(f"AnySearch HTTP {resp.status_code}: {resp.text[:200]}")
            return []
        data = resp.json()
        if data.get("code") != 0:
            logger.warning(f"AnySearch biz error: {data.get('message')}")
            return []
        results = (data.get("data") or {}).get("results") or []
        hits = []
        for idx, r in enumerate(results[:top_k]):
            title = r.get("title", "") or ""
            url = r.get("url", "") or ""
            snippet = r.get("snippet") or r.get("content") or ""
            if not snippet and not title:
                continue
            try:
                from urllib.parse import urlparse
                domain = urlparse(url).netloc
            except Exception:
                domain = ""
            hits.append({
                "content": snippet,
                "score": max(0.4, 0.9 - idx * 0.08),
                "source": "web_anysearch",
                "metadata": {
                    "url": url,
                    "title": title,
                    "source_domain": domain,
                    "zone": zone,
                },
            })
        return hits
    except Exception as e:
        logger.warning(f"AnySearch search failed: {e}")
        return []


async def anysearch_health(api_key: str, api_url: str = DEFAULT_API_URL, timeout: float = REQUEST_TIMEOUT) -> Dict:
    """连通性探测：返回 {"status": "connected"/"disconnected", "detail": ...}。"""
    if not api_key:
        return {"status": "disconnected", "detail": "未配置 API Key", "connected": False, "usable": False}
    try:
        import httpx
        async with httpx.AsyncClient(trust_env=False, timeout=timeout) as client:
            resp = await client.post(
                api_url,
                json={"query": "ping", "zone": DEFAULT_ZONE, "top_k": 1},
                headers={"Content-Type": "application/json", "Authorization": f"Bearer {api_key}"},
            )
        if resp.status_code == 200:
            return {"status": "connected", "detail": "AnySearch 连接正常", "connected": True, "usable": True}
        return {"status": "error", "detail": f"HTTP {resp.status_code}", "connected": False, "usable": False}
    except Exception as e:
        return {"status": "error", "detail": str(e)[:200], "connected": False, "usable": False}


def load_anysearch_config(db_session) -> Dict:
    """从 site_settings 读取全局 AnySearch 配置（失败返回空字典）。"""
    if db_session is None:
        return {}
    try:
        from app.models import SiteSetting
        row = db_session.query(SiteSetting).filter(SiteSetting.key == "anysearch_config").first()
        if not row or not row.value:
            return {}
        cfg = json.loads(row.value)
        if not isinstance(cfg, dict):
            return {}
        return cfg
    except Exception as e:
        logger.warning(f"load_anysearch_config failed: {e}")
        return {}


def save_anysearch_config(
    db_session,
    api_key: str,
    is_enabled: bool = True,
    api_url: str = DEFAULT_API_URL,
    zone: str = DEFAULT_ZONE,
    freshness: Optional[str] = None,
    top_k: int = 5,
) -> bool:
    """保存/更新全局 AnySearch 配置到 site_settings。"""
    if db_session is None:
        return False
    try:
        from app.models import SiteSetting
        from datetime import datetime
        cfg = {
            "api_key": api_key.strip(),
            "is_enabled": bool(is_enabled),
            "api_url": api_url.strip() or DEFAULT_API_URL,
            "zone": zone or DEFAULT_ZONE,
            "freshness": freshness,
            "top_k": max(1, min(int(top_k), 20)),
        }
        row = db_session.query(SiteSetting).filter(SiteSetting.key == "anysearch_config").first()
        if row:
            row.value = json.dumps(cfg, ensure_ascii=False)
            row.updated_at = datetime.now()
        else:
            from app.models import gen_uuid
            row = SiteSetting(id=gen_uuid(), key="anysearch_config", value=json.dumps(cfg, ensure_ascii=False))
            db_session.add(row)
        db_session.commit()
        return True
    except Exception as e:
        logger.warning(f"save_anysearch_config failed: {e}")
        try:
            db_session.rollback()
        except Exception:
            pass
        return False