from tenacity import retry, stop_after_delay, wait_fixed, retry_if_result
import requests
import json
import os
import logging


class MTOpenApiClient:

    def __init__(self, api_name, api_key=None, cost_attribution=None):
        """
        Initialize MTOpenApiClient with credentials.
        
        Args:
            api_name (str): API endpoint name
            api_key (str, optional): Direct API key for credential lookup
            cost_attribution (str, optional): Cost attribution key for AI flow credentials
        
        Raises:
            ValueError: If credentials are invalid or missing
            FileNotFoundError: If configuration files are not found
        """
        self.api_name = api_name
        
        # Load credentials based on provided parameters
        if api_key is not None:
            self._load_credentials_by_api_key(api_key)
        elif cost_attribution is not None:
            self._load_credentials_by_cost_attribution(cost_attribution)
        else:
            raise ValueError("Either api_key or cost_attribution must be provided")
        
        # Initialize API URLs
        self._initialize_urls()

    def _get_config_path(self, filename):
        """Get the full path to a configuration file."""
        dir_path = os.path.dirname(os.path.abspath(__file__))
        return os.path.join(dir_path, 'config', filename)

    def _load_json_config(self, filename):
        """Load and parse a JSON configuration file."""
        config_path = self._get_config_path(filename)
        try:
            with open(config_path, 'r', encoding='utf-8') as f:
                return json.load(f)
        except FileNotFoundError:
            raise FileNotFoundError(f"Configuration file not found: {config_path}")
        except json.JSONDecodeError as e:
            raise ValueError(f"Invalid JSON in configuration file {filename}: {e}")

    def _validate_credentials(self):
        """Validate that required credentials are present and non-empty."""
        if not hasattr(self, 'api_key') or not self.api_key:
            raise ValueError("api_key is missing or empty")
        if not hasattr(self, 'api_secret') or not self.api_secret:
            raise ValueError("api_secret is missing or empty")

    def _load_credentials_by_api_key(self, api_key):
        """Load credentials using direct API key lookup."""
        self.api_key = api_key
        data = self._load_json_config('ak_sk_mapping.json')
        self.api_secret = data.get(api_key, "")
        self._validate_credentials()

    def _load_credentials_by_cost_attribution(self, cost_attribution):
        """Load credentials using cost attribution lookup."""
        data = self._load_json_config('ai_flow_ak_sk_mapping.json')
        credentials = data.get(cost_attribution, {})
        self.api_key = credentials.get("ak", "")
        self.api_secret = credentials.get("sk", "")
        self.token = credentials.get("token", "")
        self._validate_credentials()

    def _initialize_urls(self):
        """Initialize API URLs with credentials."""
        base_url = "https://openapi.mtlab.meitu.com/v1"
        auth_params = f"api_key={self.api_key}&api_secret={self.api_secret}"
        
        # 用于异步接口的结果获取
        self.query_url = f"{base_url}/query?{auth_params}"
        # API endpoint URL
        self.url = f"{base_url}/{self.api_name}?{auth_params}"

    def fetch_response(self, msg_id):
        url = f"{self.query_url}&msg_id={msg_id}"
        headers = {"Content-Type": "application/json"}
        data={"msg_id": msg_id}
        response = requests.post(url, json=data, headers=headers)
        response.raise_for_status()  # Raise HTTP errors
        logging.info(f"fetch_response: {response.json()}")
        return response.json()

    @retry(
        stop=stop_after_delay(1000),  # Stop after 100 seconds
        wait=wait_fixed(1),  # Wait 1 second between retries
        retry=retry_if_result(lambda res: res.get("error_code") == 4)  # Retry if error_code != 0
    )
    def get_res(self, msg_id):
        """
        Fetch the result with automatic retries and timeout.
        """
        return self.fetch_response(msg_id)

    def async_request(self, data: dict, max_retries: int = 20):
        """
        发起异步请求并轮询获取结果
        
        Args:
            data (dict): 请求数据体，需包含图片URL等必要参数
                注意：异步接口仅支持图片URL格式，不支持base64编码图片
            max_retries (int): 最大重试次数，默认20次
            
        Returns:
            dict: 通过msg_id轮询获取的最终处理结果
            
        流程说明:
            1. 发送POST请求获取msg_id
            2. 通过msg_id轮询获取最终响应数据
        """
        headers = {"Content-Type": "application/json"}
        
        for attempt in range(max_retries):
            try:
                response = requests.post(self.url, json=data, headers=headers)
                response.raise_for_status()
                
                msg_id = response.json().get("msg_id", "")
                if not msg_id:
                    continue
                    
                result = self.get_res(msg_id=msg_id)
                if result.get("error_code", 0) == 0:
                    return result
                else:
                    raise Exception(result.get("error_msg", ""))

            except requests.RequestException:
                if attempt == max_retries - 1:
                    raise
                continue

        return result if 'result' in locals() else {"error_code": -1, "error_msg": "Max retries exceeded"}

    def request(self, data: dict):
        """
        发起同步请求并返回即时响应
        
        Params:
            data (dict): 请求数据体，可包含base64编码的图片数据
                注意：同步接口支持base64编码图片，异步接口需使用URL
            
        Return:
            dict: 原始响应JSON数据
        """
        # 异步接口只支持输入图片url, 同步接口才支持图片base64
        headers = {"Content-Type": "application/json"}
        response = requests.post(self.url, json=data, headers=headers)
        response.raise_for_status()  # Raise HTTP errors
        return response.json()