"""
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, extra_headers: Optional[dict[str, str]] = None) -> httpx.AsyncClient:
        """Get or create HTTP client with default headers

        Args:
            extra_headers: 额外的请求头，某些接口需要特殊的 header（如 Authorization2）
        """
        if self._client is None:
            default_headers = {
                "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,
                "language_id": self.language_id,  # 某些接口使用下划线
                "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",
            }

            # 只有在有 token 时才添加 Authorization header
            if self.api_token:
                default_headers["Authorization"] = f"Bearer {self.api_token}"

            # 合并额外的 headers（用于 Authorization2 等）
            if extra_headers:
                default_headers.update(extra_headers)

            self._client = httpx.AsyncClient(
                base_url=self.api_url,
                headers=default_headers,
                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,
        use_authorization2: bool = False
    ) -> 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
            use_authorization2: 是否使用 Authorization2 header 而不是 Authorization

        Returns:
            Response data
        """
        # 如果需要 Authorization2，关闭现有 client 并用新的 headers 创建
        if use_authorization2:
            if self._client:
                await self._client.aclose()
                self._client = None
            extra_headers = {"Authorization2": f"Bearer {self.api_token}"}
            client = await self._get_client(extra_headers)
        else:
            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
        )

        # Debug logging for product search
        if "/spu" in endpoint:
            print(f"[DEBUG MallClient] Request: {method} {endpoint}")
            print(f"[DEBUG MallClient] Params: {params}")
            print(f"[DEBUG MallClient] Response URL: {response.url}")
            print(f"[DEBUG MallClient] Response Status: {response.status_code}")

        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,
        use_authorization2: bool = False,
        **kwargs: Any
    ) -> dict[str, Any]:
        """GET request"""
        return await self.request("GET", endpoint, params=params, use_authorization2=use_authorization2, **kwargs)

    async def post(
        self,
        endpoint: str,
        json: Optional[dict[str, Any]] = None,
        use_authorization2: bool = False,
        **kwargs: Any
    ) -> dict[str, Any]:
        """POST request"""
        return await self.request("POST", endpoint, json=json, use_authorization2=use_authorization2, **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)}")

    async def get_order_list(
        self,
        page: int = 1,
        limit: int = 5,
        customer_id: int = 0,
        order_types: Optional[list[int]] = None,
        shipping_status: int = 10000,
        date_added: Optional[str] = None,
        date_end: Optional[str] = None,
        no: Optional[str] = None,
        status: int = 10000,
        is_drop_shopping: int = 0
    ) -> dict[str, Any]:
        """Query order list with filters

        查询订单列表，支持多种筛选条件

        Args:
            page: 页码 (default: 1)
            limit: 每页数量 (default: 5)
            customer_id: 客户ID (default: 0)
            order_types: 订单类型数组，如 [1, 2] (default: None)
            shipping_status: 物流状态 (default: 10000, 10000表示全部状态)
            date_added: 开始日期，格式 YYYY-MM-DD (default: None)
            date_end: 结束日期，格式 YYYY-MM-DD (default: None)
            no: 订单号 (default: None)
            status: 订单状态 (default: 10000, 10000表示全部状态)
            is_drop_shopping: 是否代发货 (default: 0)

        Returns:
            订单列表和分页信息
            Order list and pagination info

        Example:
            >>> client = MallClient()
            >>> result = await client.get_order_list(page=1, limit=10)
            >>> print(result["data"])  # 订单列表
            >>> print(result["total"]) # 总数
        """
        try:
            params = {
                "page": page,
                "limit": limit,
                "customerId": customer_id,
                "shippingStatus": shipping_status,
                "status": status,
                "isDropShopping": is_drop_shopping
            }

            # 可选参数
            if order_types:
                # orderTypes 是数组，需要特殊处理
                # API 格式: orderTypes[]=1&orderTypes[]=2
                params["orderTypes"] = order_types
            if date_added:
                params["dateAdded"] = date_added
            if date_end:
                params["dateEnd"] = date_end
            if no:
                params["no"] = no

            result = await self.get(
                "/mall/api/order/list",
                params=params,
                use_authorization2=True  # 订单列表接口需要 Authorization2
            )
            return result
        except Exception as e:
            raise Exception(f"查询订单列表失败 (Query order list failed): {str(e)}")

    # ============ Product APIs ============

    async def search_spu_products(
        self,
        keyword: str,
        page_size: int = 5,
        page: int = 1
    ) -> dict[str, Any]:
        """Search SPU products by keyword

        根据关键词搜索商品 SPU

        Args:
            keyword: 搜索关键词（商品名称、编号等）
            page_size: 每页数量 (default: 5, max 100)
            page: 页码 (default: 1)

        Returns:
            商品列表，包含 SPU 信息、商品图片、价格等
            Product list including SPU info, images, prices, etc.

        Example:
            >>> client = MallClient()
            >>> result = await client.search_spu_products("61607", page_size=60, page=1)
            >>> print(f"找到 {len(result.get('list', []))} 个商品")
        """
        try:
            params = {
                "pageSize": min(page_size, 100),  # 限制最大 100
                "page": page,
                "keyword": keyword
            }

            result = await self.get(
                "/mall/api/spu",
                params=params
            )
            return result
        except Exception as e:
            raise Exception(f"搜索商品失败 (Search SPU products failed): {str(e)}")

    async def get_love_list(
        self,
        page: int = 1,
        page_size: int = 6,
        warehouse_id: int = 2
    ) -> dict[str, Any]:
        """Get recommended products (Love List) from Mall API

        获取推荐商品列表

        Args:
            page: Page number (default: 1)
            page_size: Number of products per page (default: 6)
            warehouse_id: Warehouse ID (default: 2)

        Returns:
            Dictionary containing product list and metadata

        Example:
            >>> client = MallClient()
            >>> result = await client.get_love_list(page=1, page_size=6, warehouse_id=2)
            >>> print(f"找到 {len(result.get('list', []))} 个推荐商品")
        """
        try:
            params = {
                "page": page,
                "pageSize": page_size,
                "warehouseId": warehouse_id
            }

            result = await self.get(
                "/mall/api/loveList",
                params=params
            )
            return result
        except Exception as e:
            raise Exception(f"获取推荐商品失败 (Get love list 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