import httpx
from typing import Optional
from app.config import settings
import logging

logger = logging.getLogger(__name__)


class JavaClient:
    """Java 后端 HTTP 客户端 (所有 Python→Java 通信的单一入口)"""

    def __init__(self):
        self.base_url = settings.java_base_url
        self._client: Optional[httpx.AsyncClient] = None

    async def _get_client(self) -> httpx.AsyncClient:
        if self._client is None:
            self._client = httpx.AsyncClient(
                base_url=self.base_url,
                timeout=httpx.Timeout(10.0, connect=3.0),
            )
        return self._client

    async def close(self):
        if self._client:
            await self._client.aclose()
            self._client = None

    async def get_published_articles(self) -> list[dict]:
        """获取已发布的文章列表 (用于构建知识库)"""
        client = await self._get_client()
        resp = await client.post("/api/article/list", json={"status": "published", "limit": 1000})
        data = resp.json()
        if data.get("code") == 200:
            return data.get("data", [])
        return []

    async def search_products(self, keyword: str, limit: int = 5) -> list[dict]:
        """按关键词搜索上架商品"""
        client = await self._get_client()
        resp = await client.post("/api/product/search", json={
            "keyword": keyword, "status": "上架", "limit": limit
        })
        data = resp.json()
        if data.get("code") == 200:
            return data.get("data", [])
        return []

    async def search_activities(self, keyword: str, limit: int = 5) -> list[dict]:
        """按关键词搜索进行中的活动"""
        client = await self._get_client()
        resp = await client.post("/api/activity/search", json={
            "keyword": keyword, "status": "published", "limit": limit
        })
        data = resp.json()
        if data.get("code") == 200:
            return data.get("data", [])
        return []

    async def search_articles(self, keyword: str, limit: int = 5) -> list[dict]:
        """按关键词搜索已发布文章"""
        client = await self._get_client()
        resp = await client.post("/api/article/search", json={
            "keyword": keyword, "status": "published", "limit": limit
        })
        data = resp.json()
        if data.get("code") == 200:
            return data.get("data", [])
        return []

    async def get_user_context(self, user_id: int, params: Optional[dict] = None) -> dict:
        """获取用户上下文 (对应 Java AiContextService)"""
        client = await self._get_client()
        resp = await client.post(settings.effective_java_context_url, json={
            "user_id": str(user_id),
            "params": params or {},
        })
        data = resp.json()
        if data.get("code") == 200:
            return data.get("data", {})
        return {}