"""
Mall API Client for MCP Servers
用于调用商城 API，包括订单查询等接口
"""
from typing import Any, Optional
import httpx
from pydantic_settings import BaseSettings
from pydantic import ConfigDict


class MallSettings(BaseSettings):
    """Mall API configuration"""
    mall_api_url: Optional[str] = None
    mall_api_token: Optional[str] = None
    mall_tenant_id: str = "2"
    mall_currency_code: str = "EUR"
    mall_language_id: str = "1"
    mall_source: str = "us.qa1.gaia888.com"

    model_config = ConfigDict(
        env_file=".env",
        env_file_encoding="utf-8",
        extra="ignore"
    )


settings = MallSettings()


class MallClient:
    """Async client for Mall API"""

    def __init__(
        self,
        api_url: Optional[str] = None,
        api_token: Optional[str] = None,
        tenant_id: Optional[str] = None,
        currency_code: Optional[str] = None,
        language_id: Optional[str] = None,
        source: Optional[str] = None
    ):
        self.api_url = (api_url or settings.mall_api_url or "").rstrip("/")
        self.api_token = api_token or settings.mall_api_token or ""
        self.tenant_id = tenant_id or settings.mall_tenant_id
        self.currency_code = currency_code or settings.mall_currency_code
        self.language_id = language_id or settings.mall_language_id
        self.source = source or settings.mall_source
        self._client: Optional[httpx.AsyncClient] = None

    async def _get_client(self) -> httpx.AsyncClient:
        """Get or create HTTP client with default headers"""
        if self._client is None:
            self._client = httpx.AsyncClient(
                base_url=self.api_url,
                headers={
                    "Authorization": f"Bearer {self.api_token}",
                    "Content-Type": "application/json",
                    "Accept": "application/json, text/plain, */*",
                    "Device-Type": "pc",
                    "tenant-Id": self.tenant_id,
                    "currency-code": self.currency_code,
                    "language-id": self.language_id,
                    "source": self.source,
                    "Origin": "https://www.qa1.gaia888.com",
                    "Referer": "https://www.qa1.gaia888.com/",
                    "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36",
                    "DNT": "1",
                },
                timeout=30.0
            )
        return self._client

    async def close(self):
        """Close HTTP client"""
        if self._client:
            await self._client.aclose()
            self._client = None

    async def request(
        self,
        method: str,
        endpoint: str,
        params: Optional[dict[str, Any]] = None,
        json: Optional[dict[str, Any]] = None,
        headers: Optional[dict[str, str]] = None
    ) -> dict[str, Any]:
        """Make API request and handle response

        Args:
            method: HTTP method
            endpoint: API endpoint (e.g., "/mall/api/order/show")
            params: Query parameters
            json: JSON body
            headers: Additional headers

        Returns:
            Response data
        """
        client = await self._get_client()

        # Merge additional headers
        request_headers = {}
        if headers:
            request_headers.update(headers)

        response = await client.request(
            method=method,
            url=endpoint,
            params=params,
            json=json,
            headers=request_headers
        )
        response.raise_for_status()

        data = response.json()

        # Mall API 返回格式: {"code": 200, "msg": "success", "result": {...}}
        # 检查 API 错误
        if data.get("code") != 200:
            raise Exception(f"API Error [{data.get('code')}]: {data.get('msg') or data.get('message')}")

        # 返回 result 字段或整个 data
        return data.get("result", data)

    async def get(
        self,
        endpoint: str,
        params: Optional[dict[str, Any]] = None,
        **kwargs: Any
    ) -> dict[str, Any]:
        """GET request"""
        return await self.request("GET", endpoint, params=params, **kwargs)

    async def post(
        self,
        endpoint: str,
        json: Optional[dict[str, Any]] = None,
        **kwargs: Any
    ) -> dict[str, Any]:
        """POST request"""
        return await self.request("POST", endpoint, json=json, **kwargs)

    # ============ Order APIs ============

    async def get_order_by_id(
        self,
        order_id: str
    ) -> dict[str, Any]:
        """Query order by order ID

        根据订单号查询订单详情

        Args:
            order_id: 订单号 (e.g., "202071324")

        Returns:
            订单详情，包含订单号、状态、商品信息、金额、物流信息等
            Order details including order ID, status, items, amount, logistics info, etc.

        Example:
            >>> client = MallClient()
            >>> order = await client.get_order_by_id("202071324")
            >>> print(order["order_id"])
        """
        try:
            result = await self.get(
                "/mall/api/order/show",
                params={"orderId": order_id}
            )
            return result
        except Exception as e:
            raise Exception(f"查询订单失败 (Query order failed): {str(e)}")


# Global Mall client instance
mall_client: Optional[MallClient] = None


def get_mall_client() -> MallClient:
    """Get or create global Mall client instance"""
    global mall_client
    if mall_client is None:
        mall_client = MallClient()
    return mall_client